A Form 425 must be filed with the SEC on the date a party to a business combination first publicly distributes a written communication about the deal. That is the core of the Form 425 filing requirements: if your company puts out a press release, slide deck, transcript, email blast, or social post touching a pending merger, exchange offer, or other transaction requiring securities registration, the communication itself gets filed on EDGAR the same day, with a cover page and a specific investor legend attached.
The rule applies to both sides of a deal, applies before and after the registration statement is filed, and has no grace period.
What Triggers a Form 425 Filing
Rule 425 under the Securities Act covers two categories of communications. The larger category is written communications made in reliance on Rule 165, which lets deal parties speak publicly about a transaction on the condition that every written communication is filed with the SEC as a prospectus. The smaller category is Rule 135 notices, which contain only bare facts such as the names of the parties and the general terms of the exchange. Both categories must be filed on or before the date of first use.
The trigger is whether a communication is “made in connection with or relating to” the business combination. That standard is broad on purpose. A press release announcing a definitive merger agreement qualifies. So does a conference call transcript walking analysts through the strategic rationale, a slide deck projecting synergy savings, or an executive’s social media post promoting the deal. If the communication touches the transaction and reaches anyone outside the deal participants, it needs to be filed.
Rule 165 is the workhorse. Without it, the general prohibition on pre-filing offers in Section 5(c) would keep companies from announcing a merger at all before the Form S-4 goes in. Rule 165 opens that door; Rule 425 is the price of admission.
What Counts as a Written Communication
The definition in Rule 405 is much broader than the everyday meaning. A written communication includes anything written or printed, any radio or television broadcast regardless of transmission method, and any “graphic communication.” That last category sweeps in virtually all electronic media: emails, website content, video and audio recordings, facsimiles, and messages widely distributed through voicemail or computer networks.
The one carve-out is genuinely live communication. A speech delivered in real time to a live audience is not a written communication, so long as it does not originate from a recording or other graphic format. The moment that speech is transcribed, recorded, or reduced to slides, the resulting document becomes a written communication subject to filing. That is why companies routinely file transcripts of earnings calls and investor presentations.
When the Filing Is Due
The deadline is tied to the communication, not to a calendar. Under Rule 425(a), communications made in reliance on Rule 165 must be filed on the date of first use. Rule 135 communications must be filed on or before that date. “First use” means the moment the communication is first sent, published, or otherwise made available to people outside the deal participants. If a press release hits the wire at 8:00 AM, the Form 425 has to be on EDGAR by then or shortly before. There is no grace period.
The filing goes through EDGAR. The communication is attached as an exhibit in a format EDGAR accepts, generally HTML, ASCII, or XML. The filer selects the Form 425 submission type, attaches the communication with all required legends, adds the cover page information, and submits. Deals with heavy public communications flow are usually run so that the EDGAR filing is queued up alongside the communication itself and released together.
Responsibility follows the speaker. If the acquirer issues a press release, the acquirer files. If the target sends a letter to its shareholders, the target files. Most deals produce multiple Form 425 filings from different parties across the life of the transaction, and each party has to monitor its own output.
Cover Page and Legend Requirements
Every Form 425 filing must carry a cover page with three identifiers in the upper right corner: the name of the filer, the name of the company that is the subject of the offering, and the SEC file number for the related registration statement. If the registration statement has not been filed yet and the file number is unknown, the filer must instead give the subject company’s Exchange Act or Investment Company Act file number.
The communication itself needs a prominent legend under Rule 165(c). The legend must do two things. It must urge investors to read the registration statement and other relevant documents filed or to be filed with the SEC because they contain important information. And it must explain where investors can get those documents for free, noting the SEC’s website and identifying which documents the company will provide at no cost. This legend is a condition of the Rule 165 safe harbor. If it is missing, the safe harbor from Section 5 liability may not apply.
When the deal involves a shareholder vote, Rule 14a-12 adds its own legend requirements. The communication must identify the participants in the proxy solicitation and describe their interests, or include a prominent plain-language notice telling shareholders where to find that information. It must also tell shareholders to read the proxy statement when available. Because a Form 425 filing for a deal requiring a shareholder vote is deemed filed under Rule 14a-12, the communication should satisfy both sets of legend requirements.
For electronic communications on platforms with character limits, SEC staff has permitted a hyperlink to the full legend text instead of reproducing it in full, but only where the platform genuinely cannot accommodate the legend and the communication prominently signals that important required information is available through the link. On a platform with no character limitation, a hyperlink alone is not enough.
One Filing Covers the Proxy and Tender Offer Rules
Business combinations usually involve shareholder votes, tender offers, or both, which pulls in rules beyond the Securities Act. Rule 14a-12 under the Exchange Act allows proxy solicitations before the definitive proxy statement is delivered. Rule 14d-2(b) does the same for pre-commencement communications in tender offers. A single deal announcement can implicate all three frameworks at once.
The regulations handle this cleanly. Note 2 to Rule 425 provides that a communication filed under Rule 425 is automatically deemed filed under Rule 14a-12, Rule 14d-2(b), Rule 14d-9(a), and Rule 13e-4(c). No separate filing is needed. That is why Form 425 filings commonly carry header language stating the filing is made “pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934.” That language establishes compliance with both regimes through a single submission.
Communications You Do Not Have to File
Rule 425(d) exempts four categories of communications from the filing requirement, even when they relate to the business combination:
- Repetitive Rule 135 notices. A communication limited to the basic information permitted by Rule 135 does not need to be filed if it contains no new or different information from what was previously publicly disclosed and already filed.
- Research reports. Reports published by brokers or dealers in reliance on the safe harbors in Rules 137, 138, and 139 are exempt, so ordinary research coverage is not treated as part of the deal’s solicitation effort.
- Trade confirmations. Routine broker-dealer confirmations under Exchange Act Rule 10b-10 are exempt.
- Prospectuses filed under Rule 424. Once the registration statement is filed, communications that qualify as prospectuses filed under Rule 424 do not also need to be filed under Rule 425.
Two adjacent safe harbors sit outside Rule 425 itself but affect what counts as a filing-triggering communication in the first place.
Rule 169 covers regularly released factual business information. Routine communications the company would have made regardless of the deal, such as quarterly earnings announcements or product launches, are not treated as offers if they are consistent in nature, timing, and format with the company’s past practices. The limit is that the communication cannot contain information about the offering itself or be released as part of the offering activities. An earnings report that highlights expected synergy savings from the pending merger loses this protection.
Rule 166 covers the period before the deal is publicly announced. Communications made in connection with the transaction before the first public announcement are not treated as offers under Section 5(c), provided the participants take all reasonable steps within their control to prevent further distribution until either the announcement is made or the registration statement is filed. This is what allows due diligence and negotiation to happen among advisors, board members, and financing sources. Once the deal is announced publicly, Rule 166 stops applying and the Rule 165/425 framework takes over.
What Happens If a Communication Is Not Filed
The consequences trace back to how Rule 165 is built. Rule 165 permits public communications about a deal only on the condition that every written communication is filed under Rule 425. Miss the filing, and the Rule 165 safe harbor is lost for that communication. Without the safe harbor, the communication may constitute an illegal offer in violation of Section 5 of the Securities Act, which prohibits offers to sell securities before a registration statement is filed under Section 5(c) and requires that any prospectus delivered after filing meet the requirements of Section 10 under Section 5(b).
Section 5 violations can give the SEC grounds to delay or refuse effectiveness of the registration statement, provide a basis for enforcement action, and create private rights of action for investors under Section 12(a)(1) of the Securities Act.
The cross-filing feature matters here too. Because a Form 425 filing is deemed filed under the proxy and tender offer rules, a failure to file does not just create Securities Act exposure. It can also mean noncompliance with Exchange Act Rule 14a-12 or Rule 14d-2(b), adding regulatory and litigation risk on the proxy solicitation or tender offer side of the deal.