1. When Does a New York Transaction Require an HSR Filing?
New York does not have a separate HSR threshold. Transactions involving New York businesses must be tested under the federal HSR framework before the parties determine whether premerger notification is required.
The 2026 Federal HSR Thresholds Apply
For transactions closing on or after February 17, 2026, the minimum size-of-transaction threshold is $133.9 million. For transactions above $133.9 million but not above $535.5 million, the size-of-person test generally requires one person to have at least $267.8 million in annual net sales or total assets and the other at least $26.8 million.
Above $535.5 million, the size-of-person test generally does not apply, although exemptions still matter. Because thresholds adjust annually, the figures in effect at closing should be used.
Early merger clearance review can prevent timing problems.
Transaction Value Alone Does Not Determine Reportability
Crossing the threshold does not automatically require a filing. The parties must identify what voting securities, assets, or noncorporate interests are being acquired, how they are valued, who constitutes the acquiring and acquired persons, and whether an exemption applies.
Certain ordinary-course and intracompany transactions may fall outside HSR reporting even when the numerical threshold is exceeded.
Existing Holdings Can Change the Calculation
A new purchase is not always evaluated by itself. HSR aggregation rules can require certain interests already held by the acquiring person to be considered with the new acquisition.
For voting securities, the value held after closing may matter more than the latest purchase alone. Prior HSR filings also do not provide unlimited clearance for later acquisitions.
2. Which New York Deal Structures Need Closer HSR Review?
HSR analysis changes with the legal structure of the transaction. Minority investments, asset acquisitions, joint ventures, and cross-border deals can produce different filing results.
Minority Investments Are Not Automatically Outside HSR
A buyer does not always need control for a voting-security acquisition to become reportable.
The investment-only exemption under 16 C.F.R. § 802.9 is limited to holdings of 10% or less acquired solely for investment. Strategic involvement or governance activity can make reliance on the exemption more difficult and may require broader antitrust compliance review.
Asset Deals and Joint Ventures Require Their Own Analysis
An asset acquisition may require HSR notification when the acquired assets exceed the applicable threshold and no exemption applies. IP, licenses, equipment, or an operating business line may need to be included in the valuation.
Joint ventures and noncorporate interests can raise separate control and valuation questions. The analysis should follow the interests actually transferred.
Cross-Border Deals Can Still Trigger Federal HSR Rules
A foreign parent, buyer, or overseas closing does not automatically remove a transaction from HSR review. Foreign-transaction exemptions depend on the interests acquired and the deal's U.S. .exus.
A transaction involving New York operations may therefore require HSR review alongside foreign merger-control filings and the broader mergers and acquisitions timetable.
3. What New York Review Can Apply Alongside Federal HSR?
Federal HSR compliance does not eliminate separate New York issues. Transactions affecting New York businesses or markets may require review under state competition law or industry-specific rules.
The Donnelly Act Can Create Separate Competition Issues
New York General Business Law § 340, the Donnelly Act, prohibits specified monopolistic arrangements and restraints of competition involving business, trade, commerce, or services in New York.
HSR reportability and New York competition risk are separate questions. Expiration of the federal waiting period does not determine whether a transaction raises a New York antitrust issue.
Some New York Industries Have Separate Notice Requirements
New York imposes transaction-specific requirements in certain regulated industries.
Public Health Law Article 45-A requires covered health care entities involved in a material transaction to notify the New York State Department of Health at least 30 days before closing. Subject to statutory definitions and exemptions, specified transactions involving at least $25 million in gross in-state revenue can fall within the framework.
A covered transaction may therefore require both federal HSR review and a separate New York notice.
4. What Happens after the Federal HSR Filing?
Submitting an HSR filing does not itself authorize closing. The parties must satisfy the federal waiting-period requirement before consummating a reportable transaction.
Most Transactions Begin with a 30-Day Waiting Period
The initial waiting period is generally 30 days. Cash tender offers and certain bankruptcy transactions generally have a 15-day period.
FTC or DOJ staff may request information about competitive overlap, customers, market conditions, or internal deal analysis. The parties must also avoid premature integration while the waiting period remains in effect.
A Second Request Can Extend the Deal Timeline
If the FTC or DOJ issues a Second Request, the initial waiting period stops until the parties substantially comply.
After substantial compliance, a new waiting period generally runs for 30 days, or 10 days for qualifying cash tender offers and certain bankruptcy transactions.
The agency may then close the investigation, discuss remedies, or move toward a formal challenge.
Waiting Period Expiration Does Not End Antitrust Risk
HSR is a notification and waiting-period regime, not a final antitrust approval.
A transaction can complete the HSR process and still face a challenge based on competitive effects. The FTC may seek a preliminary injunction, the DOJ may bring a federal action, and New York law may present separate competition issues.
If the transaction becomes contested, internal documents, market evidence, customer information, and economic analysis can become central to antitrust litigation.
5. Frequently Asked Questions
Can the Parties Sign a Merger Agreement Before Making the HSR Filing?
Yes. In a negotiated transaction, the parties can generally sign a definitive agreement before filing. An HSR filing may also be based on a qualifying letter of intent or preliminary agreement.
The restriction concerns consummation. If HSR notification is required, the parties cannot complete the reportable acquisition until the federal waiting requirement has been satisfied.
How Long Is an HSR Filing Valid After the Waiting Period Ends?
The acquiring person generally has one year after the waiting period expires or terminates to cross the notification threshold identified in the filing.
Later acquisitions may require another HSR analysis depending on the threshold previously filed for, the timing of the additional acquisition, and the rules then in effect.
6. When to Review HSR and New York Transaction Risk
For a New York transaction, regulatory review should begin before the purchase agreement creates a closing timetable that may be difficult to meet. Federal HSR reportability, existing holdings, structure, exemptions, competitive overlap, and New York-specific requirements should be considered together.
Counsel can determine whether an HSR filing is required, identify parallel New York obligations, coordinate the federal waiting period, and assess whether a Second Request, state inquiry, or merger challenge could affect closing.
08 Apr, 2026
