Use the threshold in effect when the transaction closes

The FTC's 2026 minimum HSR size-of-transaction threshold is $133.9 million, effective February 17,2026. Reportability also depends on valuation, size-of-person requirements where applicable, aggregation, transaction type, and exemptions. A business approaching that scale should obtain a premerger review before committing to a closing timetable. Headline enterprise value alone may not establish the relevant HSR value, and crossing the minimum threshold does not by itself answer every filing question.

Give antitrust counsel the proposed structure, consideration, acquired interests or assets, party groups, prior acquisitions, and anticipated closing date. The threshold can change annually, so a deal signed in one year and closed in another needs the current effective rules. The seller should know whether a filing and waiting period are required, who prepares the submission, and how that process affects exclusivity and financing. A contract promising to close promptly cannot override an applicable statutory waiting requirement.

Put the regulatory delay into the cash model

Assume a hypothetical transaction has a supported HSR value of $140 million and counsel determines that filing is required. The parties' preliminary schedule anticipated closing in twenty days. If the lawful review process instead moves expected closing by forty-five days, and the seller incurs $300,000 monthly continuing transaction and financing costs, the simplified additional cash need is $450,000. The example's timing is an assumed commercial scenario, not a prediction of the agency's review duration.

Add filing fees under the current schedule, professional preparation, and any required additional work separately. A large deal can have a meaningful daily carrying cost even when the regulatory fee is small relative to price. Compare the outside date, financing commitments, and seller liquidity under a delayed case. Do not treat expiration of an ordinary waiting period as guaranteed regulatory approval of the transaction's substantive legality; counsel should explain the actual closing conditions and remaining risks in the specific case.

Verify value and prior-acquisition aggregation

Ask counsel to document the valuation method and any required aggregation of holdings or acquisitions. An offer for a minority interest, earnout, or several related steps may not map directly to the number management calls purchase price. Supply earlier acquisitions involving the relevant parties and interests. The FTC's guidance explains that notification thresholds and subsequent purchase rules can matter after an initial filing, so the reviewer needs a history rather than only this month's agreement.

Preserve supporting valuations, party financial information, and exemption conclusions. The seller should distinguish an informal screening estimate from the final reportability analysis. If consideration changes near closing, promptly update counsel. An increase that is immaterial to the parties' investment committee can still matter to a regulatory threshold or fee bracket. Likewise, changes in closing date can move a transaction across an annual threshold effective date even when the nominal price does not change.

Use current filing instructions and keep operations separate

The applicable form and instructions can change through rulemaking and litigation. Obtain the current FTC requirements at the time of filing rather than reusing a packet from an earlier acquisition. Assign document collection and review responsibilities and protect privileged and competitively sensitive material through counsel's process. The owner should know which records are required, how completeness is checked, and when the waiting-period clock actually begins under the applicable procedure.

Keep pre-closing integration planning separate from operational control and inappropriate information exchange. A signed deal does not make the buyer the operator before lawful closing. Counsel should review interim covenants and diligence access when the parties compete. The filing workstream should not become permission for the buyer to direct pricing, customers, or production. Preserve a clear decision trail for activities that remain under the seller's control while the transaction is pending.

Reconcile the final closing condition

Before wires are released, obtain counsel's confirmation of the applicable filing, waiting-period, and other antitrust closing conditions. Retain filing evidence, agency communications, the reportability analysis, and the final consideration used. Update the owner's proceeds bridge for actual fees and carrying costs. The completed large-business exit should have a supported regulatory timetable and funded delay scenario, rather than a price-only model that assumes a threshold screen and a signed purchase agreement are enough to close immediately.

Sources & further reading

Consult the original guidance and its effective dates. These references support the educational discussion; their application depends on the specific facts.

This guide was prepared with AI assistance for AE Tax Advisors. No individual professional review is claimed. Examples are illustrative, not client results. Confirm current law, state treatment, and implementation with a qualified professional. Editorial standards.