1. Why a Proposed Acquisition May Face Antitrust Scrutiny
A signed deal can still run into a regulatory objection before closing. Section 7 of the Clayton Act, 15 U.S.C. § 18, prohibits transactions whose effect may substantially lessen competition or tend to create a monopoly. The FTC or DOJ may investigate competitive harm even when a deal falls outside HSR reporting rules.
Competition Concerns That Can Change a Deal
Growth projections tell only part of the story. Regulators also ask whether customers would lose meaningful alternatives after closing.
- Overlap between businesses selling competing products.
- Control of supplies that rivals need to compete.
- Evidence suggesting higher prices or reduced innovation.
Documents That Shape the Assessment
Even routine board presentations can become evidence if they forecast reduced competition. Attorneys can compare those statements with market data during corporate due diligence.
- Board presentations describing expected competitive effects.
- Market studies showing customer alternatives.
- Integration plans and pricing forecasts.
2. Regulatory Review Can Affect the Closing Schedule
The Hart-Scott-Rodino (HSR) Act, 15 U.S.C. § 18a, requires notification and a waiting period for certain acquisitions. The initial waiting period is generally 30 days, or 15 days for certain tender offers and bankruptcy transactions. An agency can seek additional information or challenge the deal.
What Each Review Stage Means
A Second Request stops the initial clock. For most deals, a new 30-day period begins after both parties substantially comply; qualifying cash tender offers and certain bankruptcy transactions have a 10-day period.
| Review Stage | Practical Consequence |
|---|---|
| Initial waiting period | Covered parties generally cannot close until the period ends or early termination is granted. |
| Second Request | Substantial compliance generally starts an additional waiting period before closing. |
| Agency challenge | Regulators may seek an injunction or other relief against the transaction. |
Initial waiting period
- Practical ConsequenceCovered parties generally cannot close until the period ends or early termination is granted.
Second Request
- Practical ConsequenceSubstantial compliance generally starts an additional waiting period before closing.
Agency challenge
- Practical ConsequenceRegulators may seek an injunction or other relief against the transaction.
Options When Regulators Object
Companies may contest the agency's analysis, propose remedies, renegotiate terms, or abandon the deal. Each option carries different costs and closing risks, particularly when financing or termination dates approach.
- Assess whether a proposed divestiture addresses the concern.
- Revisit financing commitments and outside dates.
- Evaluate an injunction dispute through antitrust litigation.
3. HSR Filing Penalties Are Separate from Merger Challenges
HSR filing penalties arise from violations of federal notification or waiting-period requirements. A transaction can face substantive antitrust scrutiny even without an HSR violation. Conversely, an acquisition may trigger filing liability without a finding that it reduces competition.
Violations That Create Financial Exposure
Under 15 U.S.C. § 18a(g)(1), covered violations can carry civil penalties for each day of noncompliance. The 2026 maximum is $51,744 per day, although the amount imposed depends on the facts.
- Failing to notify before a reportable acquisition.
- Closing before the required waiting period ends.
- Acquiring beneficial ownership before the applicable HSR waiting period ends.
Preclosing Conduct Requires Separate Controls
Before closing, competitors that coordinate prices or customers may face separate Sherman Act exposure. Parties should limit sensitive exchanges and maintain separate business decisions. An HSR compliance review can distinguish filing duties from those broader conduct risks.
- Restrict access to customer-specific pricing information.
- Use clean teams when sensitive diligence is necessary.
- Keep pricing and customer decisions independent.
4. Responding before Regulatory Problems Escalate
A regulatory inquiry can leave a company with an approaching closing date and no settled path forward. Management should preserve relevant records, review contractual deadlines, and identify the competitive concern driving the review.
Steps after an Agency Inquiry
Start with the agency's request and the people who hold responsive documents. Preserve those records in their original form, including relevant messages and drafts.
- Preserve emails, presentations, and deal models.
- Identify custodians and document-production deadlines.
- Review closing conditions and termination provisions.
Where Transaction Attorneys Can Assist
Attorneys can examine filing obligations, prepare responses to agency requests, and assess whether proposed remedies are workable. They can also align mergers and acquisitions terms with the regulatory timetable.
- Determine applicable HSR tests and examine competition evidence.
- Prepare agency submissions and assess potential litigation.
- Review proposed divestitures and contractual termination rights.
5. Frequently Asked Questions
Can regulators challenge an acquisition after it closes?
Yes. Completion of the HSR waiting period does not provide immunity from later antitrust enforcement. Agencies can challenge consummated acquisitions under applicable law.
What is the HSR transaction threshold in 2026?
The minimum size-of-transaction threshold is $133.9 million for transactions closing on or after February 17, 2026. Size-of-person tests and exemptions may also matter; crossing that amount does not automatically require a filing.
Does buying a minority stake require an HSR filing?
Sometimes. The value of voting securities held after the acquisition, the investment-only exemption, and other HSR rules determine whether a filing is necessary.
Can parties extend a merger agreement during an investigation?
They may agree to amend contractual dates, subject to their agreement and applicable law. An extension does not replace the statutory waiting-period requirements.
6. Review Your Transaction's Regulatory Position with SJKP
Regulatory uncertainty can affect financing, closing dates, and a company's ability to complete an acquisition. SJKP's attorneys can review reporting duties, competition evidence, agency requests, and deal provisions that affect closing. Contact SJKP with the transaction timetable and any agency correspondence to discuss the next legal decisions.
01 Jul, 2025
