District 4, Communications Workers of America (CWA), AFL-CIO v. NLRB ( 2023 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Submitted September 30, 2022      Decided February 14, 2023
    No. 21-1188
    DISTRICT 4, COMMUNICATIONS WORKERS OF AMERICA
    (CWA), AFL-CIO,
    PETITIONER
    v.
    NATIONAL LABOR RELATIONS BOARD,
    RESPONDENT
    THRYV, INC., FORMERLY KNOWN AS DEX MEDIA, INC., D/B/A
    DEXYP,
    INTERVENOR
    On Petition for Review of an Order
    of the National Labor Relations Board
    Matthew R. Harris was on the briefs for petitioner.
    Ruth E. Burdick, Deputy Associate General Counsel,
    National Labor Relations Board, David Habenstreit, Assistant
    General Counsel, Julie Broido, Supervisory Attorney, and
    Gregoire Sauter, Attorney, were on the brief for respondent.
    2
    David Zwisler was on the brief for intervenor Thryv, Inc.
    in support of respondent.
    Before: SRINIVASAN , Chief Judge, PILLARD, Circuit
    Judge, and SENTELLE, Senior Circuit Judge.
    Opinion for the Court filed by Circuit Judge PILLARD.
    Dissenting opinion filed by Senior Circuit Judge
    SENTELLE .
    PILLARD , Circuit Judge: We are asked to decide which of
    two different retirement-benefit terms binds the parties to a
    labor agreement. It is undisputed that, before the parties
    arrived at the 2016 labor agreement at issue, the Company’s
    benefit plan offered bargaining-unit employees a tax-
    advantaged defined contribution plan under Internal Revenue
    Code Section 401(k)—a “401(k)” for short. It is also common
    ground that the predecessor collective bargaining agreement
    did not mention any 401(k) benefit, whereas the new agreement
    guarantees the employer will continue to provide a 401(k)
    benefit. But the parties dispute which of two documents—with
    different 401(k) terms—reflects their final and binding
    agreement.
    The Company asserted and the Board determined that the
    binding agreement is the September 16, 2016, Memorandum of
    Agreement, as hand signed by Company and Union bargaining
    representatives. The Union asserts that a different contract
    document, as typed up and circulated to the parties almost a
    year later, is the one that binds. At first blush, it might seem
    that the later document, finalized and circulated for the parties’
    reference going forward, must be the authoritative agreement.
    And the Company might appear to be on thin ice in objecting
    to a more generous 401(k) term it concededly inserted into that
    3
    finalized document—a term that the Union embraced and now
    seeks to enforce. But, as the Board recognized, which of the
    conflicting provisions applies turns on when the parties reached
    final agreement: The retirement-benefit term they agreed to at
    that time is the one that binds them.
    The hand-signed 2016 Memorandum of Agreement states
    that “[t]he Union and Employer collectively have reached
    agreement and the predecessor agreement shall only be revised
    as specifically set forth herein.” J.A. 709. That Agreement’s
    401(k)-benefit term committed only that the labor agreement
    would “acknowledge the provision of a 401(k) benefit.” J.A.
    729. The version posted the following year is a revision of the
    predecessor labor agreement, meant to incorporate the terms of
    the 2016 Memorandum of Agreement. In contrast to the hand-
    signed version, however, the revised contract document states
    that the employer’s 401(k) matching rate will be “no less than
    100% for each employee dollar contributed to individual
    accounts up to 5% maximum contribution.” J.A. 371.
    When the Company upgraded its retirement-benefit
    offering in 2018, the Union brought the unfair labor practice
    charge at issue here. The Union claimed that the Company
    unilaterally modified the parties’ collective bargaining
    agreement by “implementing a 401(k) contribution matching
    structure other than that specifically negotiated and
    memorialized in the CBA [Collective Bargaining
    Agreement].” Charge Against Employer, Attachment A
    (stating basis of charge), J.A. 3. The new, objected-to 401(k)
    plan guaranteed up to 4.8 percent overall match—the same
    overall match the Company had been providing, but structured
    a bit more favorably to the beneficiaries than the previous plan
    by front-loading the employer’s matching contribution. The
    Union pointed to the “5% maximum contribution” language in
    the revised contract document to assert that the new plan fell
    4
    short. The Company responded that it had inserted that 5
    percent term by mistake in the process of revising the
    predecessor agreement to reflect the terms of the 2016
    Memorandum of Agreement.
    The Board dismissed the complaint, concluding that the
    parties reached a final and binding labor contract as of
    September 16, 2016, and that the difference between the 2016
    Memorandum of Agreement and the 2017 contract revision
    resulted from a drafting error. To identify when the parties
    reached final agreement—and so which 401(k) term binds
    them—the Board considered evidence of the parties’
    bargaining history. The Board found that the parties reached
    final agreement at the close of negotiations in September 2016,
    when they signed the 2016 Memorandum of Agreement as the
    exhaustive list of their agreed revisions to the 2013 predecessor
    contract. During negotiations, the Board found, the Union had
    proposed and the Company rejected a 6 percent and then a 5
    percent 401(k) match. The decisive compromise leading to
    agreement on the new contract was to expressly acknowledge
    a 401(k) benefit, without commitment to any particular match.
    The Company’s Board of Directors and the bargaining unit
    members ratified the new contract in late 2016 based on the
    2016 Memorandum of Agreement.                   The follow-up
    communications between the Company’s and Union’s
    representatives in 2017 were aimed at revising the 2013
    contract’s text to reflect the terms of the Agreement they had
    reached; the parties never purported to be negotiating
    substantive terms during that ministerial process. In that
    context, the Board permissibly determined that the hand-signed
    2016 Memorandum of Agreement was final, binding, and
    exhaustive, such that its retirement-benefit term governs.
    5
    The Union seeks review here, arguing that the Board
    misapplied its precedent, impermissibly considered parol
    evidence of the parties’ bargaining history, and found facts
    unsupported by substantial evidence. For the reasons that
    follow, we deny the petition for review.
    BACKGROUND
    I.      Facts
    DexYP (the Company) publishes and sells the Yellow
    Pages phone directory and other marketing tools. The
    Company was known as YP Midwest Publishing until June
    2017, when it was acquired by Dex Media Holdings, Inc. and
    became DexYP.          DexYP has a collective bargaining
    relationship with the Communication Workers of America (the
    Union), which represents a bargaining unit of staff associates,
    service representatives, customer service specialists, and art
    technicians. YP Midwest Publishing and the Union had
    entered into a 2013 Collective Bargaining Agreement and a
    2016 successor Collective Bargaining Agreement. When Dex
    Media Holdings acquired the Company in 2017, the 2016
    agreement remained in effect and the new management
    committed to honoring all existing Collective Bargaining
    Agreements and bargaining obligations.
    The parties to the 2016 collective bargaining negotiations
    used the terms of the 2013 Collective Bargaining Agreement
    as the baseline from which they bargained. That predecessor
    contract consisted of a main agreement with forty-one articles
    and seven exhibits, plus thirty-seven side letters, a 2013
    memorandum of agreement, and three appendices. Although
    that pile of documents comprising the 2013 contract made no
    mention of retirement benefits, the employer’s benefits plan at
    the time included a 401(k) benefit for which the bargaining unit
    employees were eligible. That 401(k) plan provided that, for
    6
    employees who contributed up to 6 percent of their salary to a
    401(k) account, the employer would match the employees’
    contributions at 80 percent, i.e., contribute to an employee’s
    retirement account an amount equal to 4.8 percent of the
    employee’s salary.
    In September 2016, the Company and the Union signed a
    twenty-page Memorandum of Agreement memorializing the
    various revisions they agreed to make to the 2013 contract. The
    cover page of the Memorandum of Agreement stated: “The
    Union and Employer collectively have reached agreement and
    the predecessor agreement shall only be revised as specifically
    set forth herein.” J.A. 709. The Memorandum of Agreement
    reads like a to-do list of items to be written into the text of the
    predecessor agreement, with twenty-four revisions identified.
    Some revisions are short and straightforward: “Delete Letter
    25 and Letter 30.” J.A. 729. Other revisions specify new
    language for existing articles, increase certain reimbursement
    rates and weekly wages, or set conditions for new Company
    roles. The Memorandum addresses 401(k) retirement benefits
    as follows: “The Company agrees to acknowledge the
    provision of a 401(k) benefit to bargaining union [sic: unit]
    employees in the drafting of the collective bargaining
    agreement.” J.A. 729.
    The Company and Union did not complete the revised
    document incorporating their negotiated revisions into the
    existing contract until almost a year later. The cover page of
    that contract document as distributed late in 2017 is nearly
    identical to the cover page of the 2016 Memorandum of
    Agreement. The only difference is that actual signatures
    appeared on the cover page of the Memorandum, whereas the
    signatories’ names were typed on the cover of the document as
    posted and circulated. But the signatories are the same, and
    both documents show September 16, 2016, as the signing date.
    7
    Indeed, the Company signatory whose name is typed in is Keith
    Halpern—who represented DexYP at negotiations during 2016
    and hand signed the Memorandum of Agreement—even
    though he no longer worked for the Company when the revised
    contract document was produced with his name typed on it in
    2017.
    Central to the current dispute, the revised contract
    document as circulated includes specific language about the
    401(k) benefit that is absent from the 2016 Memorandum of
    Agreement. Whereas the Agreement states only that the
    Company would “acknowledge the provision of a 401(k)
    benefit,” the circulated contract document says: “The
    Company 401K matching rate for all bargaining unit
    employees will be no less than 100% for each employee dollar
    contributed to individual accounts up to 5% maximum
    contribution.” J.A. 371, 729. The question here is which of
    those terms reflects the binding agreement of the parties.
    To resolve which 401(k) term controls, the Board
    considered the parties’ bargaining history for the 401(k) term
    and made factual findings. In brief, the Board recounted the
    following series of events.
    In the negotiation for the 2016 Collective Bargaining
    Agreement, the Union sought to secure a labor-contract term
    protecting employees’ 401(k) benefits. Over the course of
    negotiations, the Union twice unsuccessfully sought to secure
    a specific level of employer match of employees’ 401(k)
    contributions. In June 2016, the Union proposed “to change
    the Company matching rate so that all bargaining unit
    employees receive[d] a Company match of 100% for each
    employee dollar contributed to individual accounts up to 6%
    maximum contribution.” J.A. 776 (Resp. Exh. 6 – Company-
    Held Bargaining Proposals and Bargaining Notes). YP
    8
    Midwest Publishing rejected the offer. Later that month, the
    Union proposed a 100 percent employer match up to 5 percent
    maximum contribution. The Company also rejected that offer.
    After the Union and YP Midwest Publishing failed to
    reach agreement on the amount of a 401(k) match, they settled
    on a compromise to prevent the employer from eliminating the
    benefit: Teri Pluta, the lead Union negotiator, and Keith
    Halpern, the lead Company negotiator, agreed to “have
    language in the contract that guarantees the 401(k).” J.A. 161.
    As Pluta later testified, the Union’s negotiating committee
    members anticipated the change in Company ownership that in
    fact took place in June 2017, and they “fear[ed] that . . . a new
    owner may or may not honor collective bargaining agreements,
    past practice, [or] provide the same type of benefits, so it
    became more important to [the] committee to make sure that
    they could get some guarantees there.” J.A. 159.
    Steve Flagler, a Company attorney, testified that the
    Company never agreed to a 5 percent 401(k) match during the
    pre-ratification negotiations, but only agreed to “have a
    reference in the contract to the fact that there was a 401(k) plan
    offered to [the Union’s] members.” J.A. 114. Testifying as a
    rebuttal witness, Pluta repeatedly acknowledged on cross
    examination that the Company never agreed during
    negotiations to a 5 percent 401(k) match, and that “language
    that would guarantee the 401(k)” was “the very last item that
    sealed the deal . . . .” J.A. 187.
    At the close of negotiations in September 2016, employer
    and Union representatives drafted and signed the 2016
    Memorandum of Agreement. Shortly after the negotiators
    signed the Memorandum of Agreement, the bargaining unit
    members and the Company’s Board of Directors both ratified
    the new Collective Bargaining Agreement as memorialized in
    9
    the Memorandum of Agreement. That Collective Bargaining
    Agreement became effective for a three-year term.
    Almost a year later, after Dex Media Holdings acquired
    the Company, the Company and Union completed the revised
    document incorporating their negotiated revisions into the
    existing contract.       In April 2017, seven months after
    negotiations concluded, Union representative Teri Pluta
    emailed the Company’s labor counsel, Brian Herman, and
    asked why the revised contract was not yet ready. Herman
    emailed a document eleven days later, with redlines marking
    the changes from the 2013 contract. No party representative
    remarked on the 5 percent language at the time, but Teri Pluta
    later testified that it was in “the first draft that came from YP.”
    J.A. 164. In September 2017, Pluta emailed back to Steve
    Flagler, another Company attorney, a clean version of the
    document, explaining that she had accepted the redlined
    revisions and fixed an error: a missing wage scale for a new
    position the parties agreed to in the 2016 negotiations. In that
    email, Pluta told Flagler that the document was ready to be
    posted as the updated contract.
    Flagler responded that he would post the contract to the
    Company intranet and print copies for the local unions. Flagler
    and Herman reviewed the document before posting it to the
    intranet. As Flagler later acknowledged, he “missed” the
    reference to a 5 percent match when he reviewed the post-
    ratification revisions. J.A. 116.
    There was no substantive discussion or approval action by
    either side beyond the October 2016 ratification vote by the
    bargaining unit members and approval by YP Midwest
    Publishing’s Board of Directors. Pluta testified that, in the
    interim between the April 2017 and the September 2017
    emails, the Union and the Company had no discussions about
    10
    401(k) benefits and exchanged no other versions of the revised
    contract.
    A month after Company representative Steve Flagler
    posted the updated document, a local Union vice president
    alerted a Union representative that the Company was planning
    changes to the 401(k) benefits plan in 2018. After the Union
    representative asked DexYP to send information on the new
    plan, the Company sent a benefits summary showing that the
    2018 benefits plan would maintain a maximum 4.8 percent
    employer matching contribution but change to a more generous
    matching formula. The 2016 Company benefits plan had
    included an 80% match on employee contributions up to 6% of
    employee compensation, which the 2018 plan replaced with a
    graduated, front-loaded match formula, matching 100% of
    employee contributions for the first 3% of compensation and
    60% of contributions for the next 3%.
    II.     Decision on Review
    In 2018, the Union brought an unfair labor practice charge
    against DexYP over the Company’s 2018 retirement benefits
    plan. The Union argued that DexYP violated the Collective
    Bargaining Agreement by adopting a retirement benefits plan
    that did not comply with the language in the revised document
    guaranteeing a 100% match of employee contributions up to
    5% of compensation. After investigating the charge, the
    Board’s Regional Director brought a complaint alleging that
    DexYP unilaterally changed the 401(k)-contribution formula,
    along with other allegations that the parties later settled.
    Defending against the complaint at a hearing before the
    Board administrative law judge (ALJ), DexYP argued that the
    5 percent match language in the Collective Bargaining
    Agreement resulted from a drafting error. The Company
    introduced—without objection from the Board’s General
    11
    Counsel or the Union—the 2016 Memorandum of Agreement
    that the parties signed at the close of negotiations.
    DexYP also sought to introduce other evidence: testimony
    about the 2016 negotiations and bargaining notes from those
    sessions. The General Counsel and the Union objected,
    arguing that the parol evidence rule barred evidence about the
    negotiations. The ALJ admitted the testimony about the 2016
    negotiations and associated bargaining notes under the mistake
    exception to the parol evidence rule. Under that exception, the
    Board allows oral testimony to show that a written agreement
    contains an obvious mistake. Apache Powder Co., 
    223 N.L.R.B. 191
    , 191 (1976). The ALJ noted when she decided
    to hear parol evidence that the parties would have an
    opportunity to address, in their post-hearing briefs, whether a
    mistake occurred and whether the ALJ should ultimately
    consider the parol evidence in the decision. The parol evidence
    included the above-described testimony of Company
    negotiator Steve Flagler and Union negotiator Teri Pluta about
    the 2016 negotiations and the process of revising the contract
    document for posting in 2017.
    In a written decision after the hearing, the ALJ
    recommended that the Board dismiss the complaint. YP
    Midwest Publ’g, LLC, 371 N.L.R.B. No. 23, at 9 (Aug. 26,
    2021). Analyzing witness credibility, the ALJ “did not find
    much of [Union negotiator Teri] Pluta’s testimony credible”
    because “[s]he sparred with Respondent’s counsel on cross-
    examination, gave contradictory testimony, and testified in an
    equivocal manner.” Id. at 5. The ALJ generally credited the
    other witnesses who testified.
    The ALJ found that “[t]he only agreement reached by the
    parties at the bargaining table regarding the 401(k) benefit was
    that [the Company] would acknowledge its provision to its
    12
    union-represented employees in the collective bargaining
    agreement.” Id. at 7. The parties reached “[n]o agreement” on
    the matching amount for employer 401(k) contributions. Id.
    Under those circumstances, the ALJ concluded, “the negotiated
    agreement that the [Memorandum of Agreement] would
    contain a memorialization of the existence of [the Company’s]
    401(k) program controls.” Id.
    The ALJ concluded that considering parol evidence from
    the parties’ negotiations was appropriate because, under the
    Board’s holding in Apache Powder, 223 N.L.R.B. at 191, “the
    parol evidence rule does not operate to exclude testimony
    offered to establish that no agreement was reached in the first
    place.” YP Midwest Publ’g, 371 N.L.R.B. at 6. The ALJ found
    that neither the Company nor its predecessors had ever
    “matched represented employees’ [401(k)] contributions at 5
    percent,” and, based on the evidence regarding the 2016
    negotiations, “[t]he record evidence conclusively established
    that a 5 percent match was never agreed to in bargaining.” Id.
    at 6-7. The ALJ found that, during negotiations, “the parties
    only agreed to memorialize the existence of [DexYP’s] 401(k)
    program,” that “[n]o specified amount of employer match was
    ever established,” and that the Company mistakenly included
    the 5 percent match in the revised contract. Id. at 6-8. The ALJ
    found that the parties engaged in no further negotiations, nor
    did they discuss any change in positions, between the close of
    negotiations in fall 2016 and the revision of the contract
    document in summer 2017. See id. at 4. As to whether the
    Company’s inclusion of a 5 percent 401(k) match in its redline
    markup of the predecessor agreement was an error that should
    have been obvious to the Union, the ALJ did not credit Pluta’s
    testimony that she believed the matching amount was
    “language as promised” from the Company, J.A. 199, and not
    “inconsistent” with the 401(k) match the members were
    13
    receiving or with the negotiators’ agreement to acknowledge
    the 401(k) plan, J.A. 200.
    On administrative appeal, the Board affirmed the ALJ’s
    findings and conclusions. Id. at 1. Like the ALJ, the Board
    accepted the 2016 Memorandum of Agreement as
    memorializing the agreement the parties reached in their
    negotiations. Id. at 1 n.2. Analyzing the Memorandum of
    Agreement, the Board concluded that the parties agreed the
    Company would “acknowledge the provision of a 401(k)
    benefit” in the revised contract but did not agree to any specific
    matching percentage. Id. (emphasis in original). The Board
    sustained the ALJ’s admission of parol evidence of the 2016
    negotiations under Apache Powder. Id. (citing Apache
    Powder, 223 N.L.R.B. at 191). After considering that
    evidence, the Board held that DexYP’s “drafting error should
    have been clearly obvious to the Union” given YP Midwest
    Publishing’s “clear rejection of the Union’s proposal for a 5
    percent match” and the lack of any “basis for the Union to
    assume that [the Company] had changed its position on that
    proposal.” Id.
    The Union petitioned for review. DexYP, now operating
    under the name Thryv, Inc., intervened in support of the Board.
    DISCUSSION
    The Union argues that the Board erred by crediting the
    401(k) retirement-benefit term in the parties’ 2016
    Memorandum of Agreement, admitting parol evidence, and
    finding that the revised Collective Bargaining Agreement
    circulated and posted as the final 2016-2019 contract reflected
    a drafting error. We hold that the Board acted in accordance
    with the law, including its own precedent, and that substantial
    evidence supports its findings.
    14
    I.      Standard of Review
    We review the Board’s administrative adjudications with
    “a very high degree of deference.” Ozburn-Hessey Logistics,
    LLC v. NLRB, 
    833 F.3d 210
    , 217 (D.C. Cir. 2016) (quoting
    Bally’s Park Place, Inc. v. NLRB, 
    646 F.3d 929
    , 935 (D.C. Cir.
    2011)). Within that limited scope of review, “we must uphold
    the judgment of the Board unless its findings are unsupported
    by substantial evidence, or it acted arbitrarily or otherwise
    erred in applying established law to the facts of the case.”
    Novato Healthcare Ctr. v. NLRB, 
    916 F.3d 1095
    , 1100 (D.C.
    Cir. 2019). Where a party challenges the Board’s application
    of its own precedent, we review whether the Board’s decision
    was “arbitrary, capricious, an abuse of discretion, or otherwise
    not in accordance with law.” 
    5 U.S.C. § 706
    (2)(A); Leggett &
    Platt, Inc. v. NLRB, 
    988 F.3d 487
    , 494 (D.C. Cir. 2021). So
    long as the Board offers a well-reasoned interpretation of its
    precedent, we defer to that interpretation. Ceridian Corp. v.
    NLRB, 
    435 F.3d 352
    , 355 (D.C. Cir. 2006).
    We review factual findings supporting the Board’s
    contract interpretation under the substantial evidence standard,
    “including evidence of intent from bargaining history, and
    other factual findings on matters bearing on the intent of the
    parties.” Pac. Mar. Ass’n v. NLRB, 
    967 F.3d 878
    , 884-85 (D.C.
    Cir. 2020) (quoting StaffCo of Brooklyn, LLC v. NLRB, 
    888 F.3d 1297
    , 1302 (D.C. Cir. 2018)); 
    29 U.S.C. § 160
    (e). We
    owe no special deference to the Board’s interpretation of
    contract language, but review it de novo, applying “ordinary
    principles of contract law.” Pac. Mar. Ass’n, 967 F.3d at 885
    (quoting M & G Polymers USA, LLC v. Tackett, 
    574 U.S. 427
    ,
    435 (2015)).
    15
    II.     The Board Correctly Identified the Binding
    Agreement and 401(k) Term
    We first consider the Union’s argument that the Board
    erred by treating the 2016 Memorandum of Agreement as
    authoritative rather than the document produced the following
    year and circulated as the final revised contract. The Union
    argues that the Board’s precedent required it to credit the
    401(k) term in the revised contract document over the term
    reflected in the Memorandum of Agreement. We review that
    challenge in two steps. We first consider whether the Board
    reasonably applied its precedent regarding when a collective
    bargaining agreement is formed. We then address whether
    substantial evidence supports the Board’s finding that the 2016
    Memorandum of Agreement reflects the parties’ agreement on
    the 401(k) term.
    We hold that the Board followed its own precedent by
    looking to the Memorandum of Agreement for the substance of
    the parties’ agreed 401(k) term. The 401(k) terms in the two
    relevant documents conflicted. The parties agreed in the 2016
    Memorandum of Agreement only to “acknowledge” the
    “provision” of a 401(k) benefit, whereas the document posted
    in 2017 promised a 401(k) benefit whereby the employer
    would match employees’ own contributions of up to 5 percent
    of their salary. To decide which term controlled, the Board
    followed its established approach for deciding when the parties
    reached a meeting of the minds and which terms controlled at
    that time.
    Under Board precedent, “[i]t is well-established that a
    collective bargaining agreement is formed after a meeting of
    the minds on substantive issues and material terms.” Cnty.
    Concrete Corp., 366 N.L.R.B. No. 64, at 9 (2018). The
    meeting of the minds “is measured not by parties’ subjective
    16
    inclinations, but by their intent as objectively manifested in
    what they said to each other.” 
    Id.
     (quoting Crittenton Hosp.,
    
    343 N.L.R.B. 717
    , 718 (2004)).
    To decide when the parties agreed on material terms, the
    Board looks to “mutual expressions of satisfaction about the
    successful negotiation of a contract [as] ‘hallmark indication[s]
    that a binding agreement has been reached at the end of
    negotiations.’” ABM Parking Servs., 
    360 N.L.R.B. 1191
    , 1204
    (2014) (quoting Chauffeurs Loc. Union No. 771, 
    357 N.L.R.B. 2203
    , 2207 (2011)). For example, the Board has held that an
    employer and a union reached a meeting of the minds at a
    negotiating session where the parties “concluded that session
    with handshakes and mutual expressions of satisfaction on their
    successful negotiation of a contract.” Windward Teachers
    Ass’n, 
    346 N.L.R.B. 1148
    , 1150-51 (2006); see also
    Chauffeurs Loc. Union No. 771, 357 N.L.R.B. at 2207. The
    Board likewise discerned a meeting of the minds where an
    employer’s “remarks . . . were the email equivalent of shaking
    hands on the deal at the end of a face to face meeting.” ABM
    Parking Servs., 360 N.L.R.B. at 1204. By the same token,
    bargaining unit employees’ “unqualified ratification” of an
    expired predecessor collective bargaining agreement together
    with a document reflecting “all of the agreed-on contract
    changes” similarly sufficed to show that the parties reached a
    binding agreement. Graphic Commc’ns Union, 
    318 N.L.R.B. 983
    , 992 (1995).
    A collective bargaining agreement may be binding before
    the parties reduce it to a final written form. To be sure, “once
    an agreement is reached, each party is obligated to assist in
    reducing the agreement to writing.” Ebon Servs., 
    298 N.L.R.B. 219
    , 223 (1990). But the Board has long followed the rule that
    “offer and acceptance, not execution, make a labor contract.”
    Sarauer v. Int’l Ass’n of Machinists & Aerospace Workers,
    17
    Dist. No. 10, 
    966 F.3d 661
    , 677 (7th Cir. 2020). “Once an
    agreement is reached by the parties, they are obligated to abide
    by the terms of the agreement even though those terms have
    not been reduced to writing.” Cnty. Concrete Corp., 366
    N.L.R.B. at 1 n.1 (quoting Sunrise Nursing Home, Inc., 
    325 N.L.R.B. 380
    , 389 (1998)). Indeed, “[t]he question of contract
    formation is based on the parties’ expressed intentions
    regarding the terms of a collective-bargaining agreement,”
    which may establish a contract was formed even in advance of
    any document being signed. Sunrise Nursing Home, Inc., 325
    N.L.R.B. at 389. Once the parties reach agreement, ensuing
    back-and-forth about the contract may be “merely
    communications aimed at converting their agreement into a
    complete, written contract.” ABM Parking Servs., 360
    N.L.R.B. at 1204.
    The Board’s treatment of collective bargaining agreements
    as binding before they are reduced to a final writing helps to
    protect the bargaining process. For example, the Board has
    held that a party that refuses to sign an agreement after
    acquiescing to its terms during negotiations “impairs the
    bargaining process and tends to frustrate the aim of the
    [National Labor Relations Act] to secure industrial peace
    through collective bargaining.” H. J. Heinz v. NLRB, 
    311 U.S. 514
    , 526 (1941). To avoid those problems, the Board treats the
    refusal to sign a written contract after reaching agreement on
    its terms through negotiation as an unfair labor practice under
    Section 8(b)(3) of the National Labor Relations Act.
    Windward Teachers, 346 N.L.R.B. at 1150.
    Applying those principles to this case, the Board did not
    need to look for handshakes or email acceptances. The record
    contains direct evidence of the terms the parties reached during
    negotiations: the signed September 2016 Memorandum of
    Agreement.      The Board’s decision to credit the 2016
    18
    Memorandum of Agreement as reflecting the parties’ agreed
    401(k) term accords with its established precedent referencing
    the “meeting of the minds” to identify when the parties reached
    a binding agreement and to treat as authoritative the terms they
    agreed to at that time.
    Substantial evidence supports the Board’s conclusion that
    the Memorandum of Agreement represented the parties’
    binding agreement on the 401(k) term. The Memorandum of
    Agreement stated that the “Union and Employer collectively
    have reached agreement and the predecessor agreement shall
    only be revised as specifically set forth herein.” J.A. 709. The
    employer and Union representatives signed the cover page and
    initialed each page. The bargaining unit members and the
    Company’s Board of Directors ratified the 2016 Memorandum
    of Agreement as their negotiated updates to the predecessor
    Collective Bargaining Agreement. By signing an agreement
    stating that the prior contract would be revised only as
    specifically agreed in the Memorandum of Agreement, and by
    sending that package through the ratification process, the
    parties showed that they regarded the Memorandum of
    Agreement as the binding document memorializing their new
    Collective Bargaining Agreement.
    The leisurely way the parties went about revising the 2013
    contract’s text to reflect the agreed-to changes reinforces the
    importance of the 2016 Memorandum of Agreement. It was
    not until April 2017, seven months after signing the
    Memorandum of Agreement, that Union representative Teri
    Pluta asked DexYP counsel Brian Herman why the Company
    had not yet sent the Union a document incorporating the
    negotiated changes into the preexisting contract. Herman sent
    a redlined document eleven days later, and Pluta took nearly
    five more months to return it to him, writing that she had
    accepted the revisions and included a missing wage scale for a
    19
    new position. The parties apparently never even pointed out or
    acknowledged during the revision process the 5 percent
    matching term that appeared in the revised contract document,
    and they expressed confusion before the ALJ about how it got
    there. The bargaining unit members and the Company’s Board
    of Directors had ratified the Memorandum of Agreement in
    2016; neither party undertook any ratification process for the
    revised contract document in 2017.
    The cover page of the revised contract document refers to
    September 16, 2016, as the date of the agreement. The cover
    pages of both the 2016 Memorandum of Agreement and the
    contract package as revised, posted, and circulated in 2017
    reflect that same September 2016 date—when Company and
    Union negotiators signed the 2016 Memorandum of
    Agreement, not when Herman and Pluta finished incorporating
    the changes into the text of the predecessor agreement or when
    the Company posted it on its intranet. The signatories are the
    same—with signatures handwritten on the September 2016
    Memorandum of Agreement and the same names typed on the
    revised version circulated to employees in 2017—even though
    the employer’s signatory, Keith Halpern, no longer worked for
    the Company when the revision was done. Halpern’s
    replacement, Brian Herman, supervised the revision process,
    but Halpern’s is the only name that appears on the final version.
    The timing of the parties’ ratification of the contract terms,
    together with the casual pace at which the parties later
    incorporated the negotiated revisions into the predecessor
    agreement, supports the Board’s conclusion that it was the
    Memorandum of Agreement that was binding. The use of the
    same employer signatory even after his departure from the
    Company reinforces that the parties’ agreement was finalized
    in September 2016, not 2017. Substantial evidence supports
    the Board’s finding that the 401(k) term in the ratified 2016
    20
    Memorandum of Agreement, not the post-ratification revision,
    reflects the parties’ binding agreement.
    III.    The Board Permissibly            Considered Parol
    Evidence
    Next, we review the Board’s application of the parol
    evidence rule. The Union argues that the Board incorrectly
    relied on Apache Powder, 
    223 N.L.R.B. 191
    , to admit
    testimony and bargaining notes relating to the 2016
    negotiations to discern the Company’s mistake. In the Union’s
    view, the Board should have instead followed its precedent in
    Windward Teachers Association, 
    346 N.L.R.B. 1148
     (2006),
    and Ebon Services, 
    298 N.L.R.B. 219
     (1990), two cases in
    which the Board rejected a mistake defense and enforced a
    collective bargaining agreement as written. That precedent,
    says the Union, requires enforcement of the term inserted in the
    2017 contract revision rather than the term reflected in the 2016
    Memorandum of Agreement. We must determine whether, in
    looking to parol evidence to resolve that claim, the Board
    arbitrarily and capriciously departed from its precedent. ABM
    Onsite Services-W., Inc. v. NLRB, 
    849 F.3d 1137
    , 1146 (D.C.
    Cir. 2017).
    The Board recognized the mistake exception to the rule
    against parol evidence in Apache Powder when it held that “the
    parol-evidence rule does not operate to exclude testimony
    offered to establish that in fact no agreement was reached in the
    first place.” 223 N.L.R.B. at 191. The employer in Apache
    Powder had refused to sign a collective bargaining agreement
    because, it claimed, the agreement the parties initialed and
    ratified contained a mistake. Id. at 193-94. It sought to offer
    parol evidence to show that, during negotiations, it
    inadvertently proposed a start date for higher monthly pension
    benefits a year earlier than the parties intended. Id. at 194. The
    21
    ALJ admitted the parol evidence, recognizing that evidence
    outside an agreement “may be introduced for the purpose of
    ascertaining the correct interpretation of an agreement, as well
    as to establish the nonexistence of an agreement.” Id. (internal
    citations omitted). After considering the parol evidence, the
    ALJ found that the start date was indeed a drafting error. Id.
    The Board affirmed. Id. at 191. The Board cautioned that
    “rescission for unilateral mistake is, for obvious reasons, a
    carefully guarded remedy,” but held the standard met because
    the start-date mistake was “so palpably at odds with the pension
    provisions of the existing contract as to put the [union] on
    notice of an obvious mistake by the [employer].” Id.
    Apache Powder established two rules relevant here: First,
    parol evidence is admissible to establish whether an agreement
    was reached; second, a unilateral mistake occurs “where the
    mistake is so obvious as to put the other party on notice of an
    error.” Id.
    The Board has consistently relied on the Apache Powder
    formulation of the mistake exception to the parol evidence rule.
    In some decisions, the Board discusses parol evidence before
    concluding that no mistake occurred and enforcing an
    agreement as written. See, e.g., Monterey/Santa Cruz Bldg.
    Trades Council (Nat’l Refractories), 
    299 N.L.R.B. 251
    , 257
    (1990). In others, the ALJ admits parol evidence at the hearing
    but, on consideration, finds no need to refer to it in the written
    decision. See, e.g., Sheehy Enterprizes, Inc., 
    353 N.L.R.B. 803
    ,
    805 n.1 (ALJ decision), 806 (2009). Other Board decisions,
    like Apache Powder and the decision under review, consider
    parol evidence and, based on the bargaining history it discloses,
    conclude that the written agreement contains a mistake. See,
    e.g., Waldon, Inc., 
    282 N.L.R.B. 583
    , 584-86 (1986); Cook
    Cnty. Sch. Bus, Inc., 
    333 N.L.R.B. 647
    , 653 (2001), enforced,
    22
    
    283 F.3d 888
    , 896 (7th Cir. 2002); Globe-Union, Inc., 
    245 N.L.R.B. 145
    , 147 (1979).
    The mistake exception finds support not only in Board
    precedent, but in accepted principles of generally applicable
    contract law. See M & G Polymers, 574 U.S. at 430, 433
    (2015). Contract doctrine recognizes that “oral testimony is
    admissible to prove fraud or misrepresentation, mistake, or
    illegality.” 6 Corbin on Contracts § 25.20 (2022). “Such
    invalidating causes need not and commonly do not appear on
    the face of the writing.” Restatement (Second) of Contracts
    § 214 (2022). And, “[s]ince the application of the parol
    evidence rule depends on the existence of a valid integrated
    contract, the rule does not preclude evidence which contradicts
    the very existence or validity of an alleged contractual
    obligation.” 11 Williston on Contracts § 33:14 (4th ed. 2022).
    Our dissenting colleague argues that the 2016 signed and
    ratified Memorandum of Agreement is itself parol evidence.
    Diss. Op. at 2. But as explained, that Memorandum of
    Agreement is itself the agreement that binds the parties.
    Necessarily, then, it is not parol evidence. And indeed, the
    Union and the Board’s General Counsel never objected to
    consideration of that document as parol evidence. At the
    hearing before the ALJ, neither the Union nor General Counsel
    objected when the Company introduced the Memorandum of
    Agreement. They raised the parol evidence objection only to
    oral testimony about the negotiations preceding that signed
    contract.
    The Union argues that by admitting parol evidence in this
    case the Board departed from its decisions in Windward
    Teachers Association, 
    346 N.L.R.B. 1148
    , and Ebon Services,
    
    298 N.L.R.B. 219
    . Because the Board in those two cases
    enforced written contract terms, the Union reasons, the Board
    23
    should enforce the revised contract’s terms here. But the Board
    in both of those cases considered oral testimony about the
    parties’ bargaining history before concluding that the written
    terms accurately reflected the parties’ agreement at the close of
    negotiations. Windward Teachers, 346 N.L.R.B. at 1148-50;
    Ebon Servs., 298 N.L.R.B. at 220-22. The Union’s objection
    here is accordingly reduced to a challenge to the Board’s
    factual finding that the revised contract contained a drafting
    error, not the ALJ’s admission of parol evidence to consider
    whether a mistake occurred.
    IV.     Substantial Evidence Supports the Board’s
    Mistake Finding
    We next consider whether substantial evidence supports
    the Board’s finding that the specific 401(k) language in the
    revised document was a mistake. The Board found that “it
    should have been obvious to the Union that the inclusion of a
    specific matching percentage of 5 percent did not reflect the
    parties’ understanding and was a drafting error.” YP Midwest
    Publ’g, LLC, 371 N.L.R.B. at 1 n.2. To so find, the Board
    applied the standard for unilateral mistake from Apache
    Powder: A finding of unilateral mistake is a “carefully guarded
    remedy,” appropriate “where the mistake is so obvious as to
    put the other party on notice of an error.” 223 N.L.R.B. at 191.
    The Union challenges that determination, arguing that even if
    the employer mistakenly added the 5 percent match language
    to the draft, the mistake was not obvious enough to place the
    Union on notice. Substantial evidence supports the Board’s
    finding to the contrary.
    De novo review of the dueling contract terms themselves
    does not reveal whether the 401(k)-benefit term offering a 5
    percent match resulted from a mistake. Where contract
    language contains a drafting error, the mistake “commonly
    24
    do[es] not appear on the face of the writing.” Restatement
    (Second) of Contracts § 214. The mistake here is apparent only
    in light of the Board’s findings about the bargaining history.
    The deference we owe to the Board’s findings of fact extends
    to its findings that describe bargaining history and provide
    context showing when and how the parties reached agreement.
    See Pac. Mar. Ass’n, 967 F.3d at 885.
    The facts of the parties’ course of bargaining reveal that
    they had reached a complete and binding agreement in
    September 2016, when the parties signed the Memorandum of
    Agreement stating they would “acknowledge” the 401(k)
    benefit, and that the parties promptly ratified the agreement on
    that basis. J.A. 729. Their binding agreement did not include
    the language guaranteeing a 5 percent match, which was only
    mistakenly inserted the following year during the process of
    updating the predecessor contract for circulation. See supra at
    18-20. Several of our sister circuits have looked to ratification
    as the “last act necessary” to create an enforceable labor
    contract. Sarauer, 966 F.3d at 676; Mack Trucks, Inc. v. United
    Auto, Aerospace & Agr. Implement Workers of Am., 
    856 F.2d 579
    , 592 (3d Cir. 1988); NLRB v. Deauville Hotel, 
    751 F.2d 1562
    , 1569 n.10 (11th Cir. 1985); Sw. Airlines Co. v. Loc. 555,
    Transp. Workers Union of Am., 
    912 F.3d 838
    , 846-47 (5th Cir.
    2019). On that logic, the Seventh Circuit affirmed a Board
    finding of mistake where a drafter introduced a post-ratification
    typo into a contract. NLRB v. Cook Cnty. Sch. Bus, Inc., 
    283 F.3d 888
    , 895-96 (7th Cir. 2002). There, the Seventh Circuit
    observed that bargaining unit members ratified an earlier
    synopsis without the typo and had never voted to adopt the
    later-appearing “actual agreement,” which a union
    representative had finalized (with a typo) “merely for signature
    by the head honchos.” 
    Id. at 895
    .
    25
    Enforcing the ratified agreement here—rather than the
    revised contract document as circulated and posted—is
    unassailable where the record contains no evidence of
    “renegotiation of the agreement’s terms” after the date of
    ratification. Sarauer, 966 F.3d at 676. Again, YP Midwest
    Publishing negotiator Steve Flagler and Union negotiator Teri
    Pluta both testified that the Union never persuaded the
    Company during negotiations to agree to a 5 percent 401(k)
    match. Yet the language that ultimately ended up in the
    agreement—language nearly identical to the language that the
    Company had rejected in June 2016—called for a 5 percent
    match. Under those circumstances, substantial evidence
    supports the Board’s conclusion that the 5 percent match was a
    drafting error that should have been obvious to the union.
    The Union argues that the Board erred by not following
    Ebon Services, 298 N.L.R.B. at 219 n.2, 223 and Windward
    Teachers, 346 N.L.R.B. at 1151, to hold that parties are bound
    by language they reviewed and agreed to sign. The Board
    should have held the 5 percent 401(k) match term binding, says
    the Union, because it was consistent with the term of the 2016
    Memorandum of Agreement, so not a mistake. The cases on
    which the Union relies are consistent with the Board’s
    approach to determining when a binding agreement was
    reached in the first place. In Ebon Services and Windward
    Teachers, parties successfully challenged their counterparties’
    refusals to sign agreements with language they had agreed to at
    the close of negotiations. Ebon Servs., 298 N.L.R.B. at 219
    n.2; Windward Teachers, 346 N.L.R.B. at 1151. In both cases,
    the Board considered oral testimony about the parties’
    negotiations, then decided that the written terms accurately
    reflected the parties’ agreement at the close of negotiations.
    Ebon Servs., 298 N.L.R.B. at 224-25; Windward Teachers, 346
    N.L.R.B. at 1149-50. Specifically, the employer in Ebon
    Services, having read over the agreement and verbally agreed
    26
    to sign, ultimately refused to sign even though “there was no
    mutual mistake or misunderstanding about any of the terms” in
    the agreement. 298 N.L.R.B. at 224-25. And in Windward
    Teachers, the union claimed mistake and so refused to sign an
    agreement even though the disputed language had been present
    in the draft agreement during the final negotiating session when
    the parties reached agreement. 346 N.L.R.B. at 1149. The
    Board’s decision in this case reflects the same approach it has
    used in prior cases to identify the terms the parties agreed to in
    negotiations and enforce the written agreement memorializing
    those terms.
    The Board recognizes that resorting to parol evidence to
    find a unilateral mistake in a written agreement is reserved for
    “unusual instance[s].” Apache Powder, 223 N.L.R.B. at 191.
    Rightly so. Consistent with that recognition, the Board in the
    decades since Apache Powder has declined to recognize
    unilateral mistake in the absence of a mistake so obvious as to
    communicate to the opposing party that it was unlikely to have
    been intended. For example, the Board has rejected a mistake
    defense where a union negotiator “hurriedly glanced at” a side
    letter before approving it, then later argued that he did not
    intend to agree to the letter’s terms. Television Artists AFTRA
    (Eleven-Fifty Corp.), 
    310 N.L.R.B. 1039
    , 1041, 1044 (1993).
    The Board has also declined to find mistake where a negotiator
    made incorrect assumptions before agreeing to a contract term.
    Nat’l Refractories, 299 N.L.R.B. at 257. The reasoning in
    those cases, as here, treats as binding the terms that the parties
    agreed to and submitted for ratification at the conclusion of
    their negotiations. Id.; Eleven-Fifty Corp, 310 N.L.R.B. at
    1043. Here, the parol evidence of the parties’ bargaining
    history allowed the Board to identify the Memorandum of
    Agreement as the final product of the parties’ negotiations, and
    to conclude that the 401(k) term in the 2017 revised version of
    27
    the Collective Bargaining Agreement           contained    an
    unenforceable unilateral mistake.
    *     * *
    For the foregoing reasons, we deny the petition for review.
    So ordered.
    SENTELLE , Senior Circuit Judge, dissenting: This case
    presents a straightforward contract dispute between
    Communications Workers of America (“the Union”) and
    DexYP (“the Company”). The Union and the Company
    negotiated. They reduced their negotiations to a written
    agreement, the Collective Bargaining Agreement (“CBA”).
    And both parties signed the agreement. That is the end of the
    story. The National Labor Relations Board in the opinion
    under review erred in accepting parol evidence to rewrite that
    agreement. In this Court, the majority cites Williston and
    Corbin for the proposition that a court may review parol
    evidence in the cases of fraud, misrepresentation, or lack of a
    valid integrated contract. Op. at 22. But there is an even more
    fundamental rule of contracts: courts hold parties to their
    bargains. See, e.g., NRM Corp. v. Hercules Inc., 
    758 F.2d 676
    ,
    681 (D.C. Cir. 1985) (“Where the language of a contract is
    clear and unambiguous on its face, a court will assume that the
    meaning ordinarily ascribed to those words reflects the
    intentions of the parties.”).
    First, the “mistake” in the 2017 CBA, supposedly
    memorializing the parties’ 2016 Memorandum of Agreement
    (“MOA”), is far from obvious. See Apache Powder Co., 
    223 N.L.R.B. 191
    , 191 (1976) (“[R]escission for unilateral mistake
    is, for obvious reasons, a carefully guarded remedy reserved
    for those instances where the mistake is so obvious as to put
    the other party on notice of an error.”). First, the Company’s
    attorney himself wrote the disputed 5% 401(k) contribution
    term into the CBA. See Resp. Br. at 7–8. Then, he highlighted
    the change by redlining the term before sending it to the
    Union’s attorney. See 
    id.
     This is perhaps an even worse
    scenario for violation of the parol evidence rule than not
    reading—and agreeing to—a term in a contract, a scenario in
    which we still hold parties to their bargains. See Paterson v.
    Reeves, 
    304 F.2d 950
    , 951 (D.C. Cir. 1962) (“One who signs a
    contract which he had an opportunity to read and understand is
    bound by its provisions.”). The Company wrote the term into
    2
    the final contract and highlighted it for the Union to review. It
    strains credulity to then penalize the Union for not recognizing
    an “obvious” mistake in the term amount.
    Second, the parties engaged in a full exchange. Neither
    side suffered from a bargaining disadvantage or mismatched
    negotiating skills. See BHM Healthcare Sols., Inc. v. URAC,
    Inc., 
    320 F. Supp. 3d 1
    , 10 (D.D.C. 2018). The attorneys for
    both sides exchanged the final agreement back and forth. The
    parties have a right to rely on the document to which they both
    agreed.
    Third, courts take the parol evidence rule very
    seriously, especially in cases of unilateral mistake, a point the
    majority acknowledges. Op. at 21. But the majority here
    tautologically uses parol evidence to prove it needs parol
    evidence. The 2016 MOA is parol evidence. Relying on it to
    conclude what the final, executed 2017 CBA means is to
    therefore violate the parol evidence rule. If the 2016 MOA
    represented the final, negotiated settlement between the parties,
    as the majority contends, there would have been no need for
    the Union and the Company to execute the 2017 CBA. The
    majority claims the MOA is inconsistent with the as-executed
    CBA including the 5% term, indicating a lack of a meeting of
    the minds, but the MOA only included placeholder language
    that the parties would later insert the term. See J.A. 729 (“The
    Company agrees to acknowledge the provision of a 401(k)
    benefit to bargaining union [sic: unit] employees in the drafting
    of the collective bargaining agreement.”). Therefore, the 2016
    MOA and the 2017 CBA are just as easily consistent with one
    another.
    3
    At base, the CBA is the final agreement. We must
    adhere to the four corners of that document, in which both
    parties agreed to a 5% 401(k) matching contribution term.
    I respectfully dissent.