GAO sustained a bid protest filed by Morrish-Wallace Construction d/b/a Ryba Marine Construction Co. against the Army Corps of Engineers in B-423796.2, decided February 2026, ruling that the Corps improperly awarded a construction contract to E.C. Korneffel Co. after Korneffel failed to acknowledge a material solicitation amendment in its sealed bid. The decision, covered by the Government Contracts Legal Forum in April 2026, turned on GAO's analysis of the materiality standard for sealed bidding under FAR Subpart 14.4 — a doctrine that governs when a bidder's failure to acknowledge an amendment is fatal to its bid. GAO held that Amendment 3, which required a wider steel pile channel cap than the original solicitation specified, was a material amendment because it added substantive performance requirements. The Corps' decision to accept Korneffel's bid anyway, without seeking clarification or rejecting the bid as nonresponsive, was improper. GAO recommended that the Corps reject Korneffel's bid and make award to the next-lowest responsive and responsible bidder.
Sealed Bidding and the Amendment Acknowledgment Requirement
The Federal Acquisition Regulation requires that contracting officers use sealed bidding — rather than negotiated acquisition — when the requirement is well-defined, price is the primary basis for award, and it is not necessary or desirable to conduct discussions with bidders. The sealed bidding process uses an Invitation for Bid rather than a Request for Proposals; award goes to the lowest responsive and responsible bidder without negotiation. When a contracting officer issues an amendment to the IFB after bids have been solicited but before the bid opening date, bidders must formally acknowledge the amendment by signing a block on the amendment document and submitting that acknowledgment with their bid. This requirement exists because amendments frequently change what the bidder is agreeing to perform, and an unacknowledged amendment creates ambiguity about whether the bidder's price reflects the changed requirements.
The FAR's treatment of unacknowledged amendments distinguishes between material amendments — those that change the specifications or contract terms in a substantively significant way — and immaterial amendments. An immaterial amendment typically involves a clarification, correction of a typographical error, or change of so minor a nature that no bidder could reasonably have offered a different price had the amendment appeared in the original solicitation. A material amendment, by contrast, involves a requirement change significant enough that bidders might have priced differently or declined to bid had they seen it in the original solicitation. Failure to acknowledge a material amendment renders a bid nonresponsive — legally defective in a way that cannot be waived — and the contracting officer is required to reject the bid.
Why $21,000 Was Enough to Be Material
The Army Corps argued that Amendment 3's requirement for a wider steel pile channel cap added only approximately $21,000 to the cost of a multi-million dollar construction contract, and that this minor cost impact meant the amendment was immaterial. GAO rejected this argument and confirmed that materiality is not determined solely by the dollar amount of the change but by the nature of the requirement change and whether it could have affected bidder behavior. The amended specification requiring a wider steel pile channel cap changed a substantive performance requirement — the physical dimensions of a structural steel component — rather than merely clarifying an existing requirement or correcting an ambiguity. A bidder that did not perform a structural analysis of the amended requirement might have underpriced the work even if the cost difference was modest, and a bidder that reviewed the amendment might have concluded that the wider channel cap changed its approach to the structural design in ways not reflected in a simple cost adder.
GAO's ruling reaffirms a principle that has been consistent in its bid protest jurisprudence: the materiality analysis is not a cost threshold test. Amendment content that changes what the contractor must build or deliver is presumptively material regardless of whether the incremental cost is large or small. Contracting officers who assess amendment materiality solely by looking at the change in contract price are applying the wrong standard, and the consequence — as it was in this case — is a sustained protest that requires rejection of the already-selected awardee's bid.
What It Means for Contractors
The Ryba Marine decision provides clear guidance for both bidders and contracting officers on how to handle IFB amendments in sealed bidding competitions.
- Bidders in sealed bid competitions must review every amendment carefully regardless of its apparent significance and acknowledge all amendments on the bid submission; a simple checklist against the list of issued amendments immediately before bid submission is a practical compliance measure that ensures no acknowledgment is inadvertently omitted.
- Contracting officers evaluating sealed bids who identify an unanknowledged amendment in a low bid should not reach for waiver without carefully applying the materiality test; the default position when an amendment changes a performance specification is that the amendment is material and the bid is nonresponsive, and waiver is only appropriate when the amendment truly could not have affected the bid price or the bidder's willingness to bid.
- Second-place bidders in sealed bid competitions who believe the low bidder failed to acknowledge a material amendment have standing to protest this issue both pre-award and post-award; the protest filing deadline runs from when the bidder knew or should have known the basis for protest, so second-place bidders should review debriefing information about the awardee's bid promptly.
- The corrective action in Ryba Marine — rejecting the awardee's nonresponsive bid and making award to the next-lowest responsive and responsible bidder — is the standard remedy for this type of protest; contractors holding a second-low position in a sealed bid competition where the low bidder has responsiveness issues should preserve their protest rights and engage counsel promptly.
IFB Bid Responsiveness After Amendments
The Ryba Marine decision confirms that IFB responsiveness rules apply to a bidder's response to amendments issued before bid opening, not only to the original submission. When an agency amends an IFB, bidders must acknowledge the amendment or submit a new bid incorporating it. Failure to acknowledge an amendment affecting price, delivery, or scope is a nonresponsiveness defect — automatic under FAR 14.404-2 and not waivable as a minor irregularity. Firms participating in IFB procurements should track all amendments carefully and confirm that their bid submission systems flag acknowledgment requirements for each issued amendment well before the bid opening deadline.