M&A planning

Your 10b5-1 plan and a company acquisition: what changes and what does not.

An acquisition announcement creates a sharp divide in time. Before the announcement, executives may have adopted a 10b5-1 plan with no knowledge of the deal — and that plan's trades remain protected. After the announcement, the same executives are clearly in possession of material nonpublic information and cannot adopt a new plan. The rules governing what happens in between — and what happens at close — depend on whether the transaction is structured as a tender offer, a one-step merger, or a mix of both, and on whether your plan document anticipated a change-of-control event.

This guide covers the mechanics and the planning decisions that arise when M&A enters the picture for an insider with an active plan.

The core principle: plan adoption timing determines protection

A 10b5-1 plan provides an affirmative defense against insider-trading liability because the trading instructions were established before the insider possessed material nonpublic information. That logic applies in an M&A context the same way it applies in any other context:

• Plan adopted before any MNPI about the deal: Trades executing under the plan continue to be protected, even after the deal becomes public knowledge. The good-faith adoption and the absence of MNPI at adoption are what matter — not whether the stock later becomes the subject of a transaction.
• Plan adopted after MNPI about the deal has arisen: The affirmative defense is unavailable. If you adopt or modify a plan while you are aware that your company is in negotiations or has received a bid, the plan is not a clean plan. It may expose you and the plan to SEC scrutiny, regardless of when trading begins.

The 2023 amendments codified in SEC Release 33-11138 require officers and directors to certify, at plan adoption, that they are not aware of MNPI and that the plan was not adopted as part of a scheme to evade insider-trading prohibitions.¹ An executive who signs that certification while knowing a deal is in active negotiation has falsified the certification — the good-faith condition is not met.

Tender offers: Rule 14e-5 and the 10b5-1 exception

When a bidder launches a tender offer for your company's stock, a separate rule enters the picture. Rule 14e-5 prohibits purchases of the target's securities outside the tender offer during the offer period — to prevent the bidder or its affiliates from acquiring shares at a premium on the side while the public tender offer is pending.²

Rule 14e-5 contains an express exception for purchases made pursuant to a 10b5-1 plan that was adopted before the announcement of the tender offer, provided:

• The plan was established in good faith and was not entered into as part of a plan or scheme to evade the provisions of Rule 14e-5.
• The insider does not alter or deviate from the plan instructions after the announcement.
• The purchases are made by a person who is not acting as a financial advisor or dealer-manager to the bidder.

The practical consequence: if you are a director or officer of the target company and you have a properly adopted 10b5-1 plan that was in place before the tender offer was announced, your scheduled sell orders can continue to execute under the Rule 14e-5 exception — subject to your plan terms, any company trading-policy requirements, and compliance review by your broker.

What you cannot do: instruct your broker to modify the schedule, accelerate sales, or otherwise deviate from the original plan instructions once the tender offer is announced. Any such instruction constitutes a modification that voids the exception and may constitute a violation of Rule 14e-5.

One-step mergers (stock-for-stock and cash mergers by vote)

Not all acquisitions are structured as tender offers. Many are structured as mergers requiring a shareholder vote, without a separate tender-offer period. In these transactions, Rule 14e-5 does not directly apply — but the fundamental MNPI analysis still does.

An insider at a company being acquired through a one-step merger faces the same good-faith question as in any other context: were you aware of MNPI when you adopted the plan? If yes, the plan is compromised. If no, plan trades continue under the affirmative defense.

Additional considerations specific to merger closings:

• Merger agreement trading restrictions. Many merger agreements include standstill provisions or trading restrictions on insiders between signing and closing. These provisions are contractual, not regulatory, but they may effectively pause plan executions regardless of the regulatory status. Read the merger agreement or coordinate with company counsel before assuming plan trading can continue after signing.
• Company trading policy. Most public companies impose blackout windows around material corporate events. A signed merger agreement is almost universally a blackout trigger. Even if your plan would otherwise continue under the affirmative defense, your company's trading policy may require a pause. Plans adopted during a trading window usually must also comply with the issuer's trading-window requirements at execution.
• Form 4 implications. Every plan execution during the merger process will appear on a Form 4 within two business days. Your insider-trading compliance team and company counsel will likely want to review these before and after announcement. Coordinate Form 4 disclosures carefully during this period.

Change-of-control provisions in plan documents

Many plan documents contain provisions that terminate, suspend, or modify the plan automatically upon a change-of-control event. If your plan was drafted by company counsel or a compliance-oriented broker, check for language along these lines:

• Automatic termination on announcement. Some plans terminate on the date a publicly announced merger agreement is signed. If your plan has this provision, no trades can execute after the signing date, regardless of what the regulatory rules would otherwise permit.
• Termination on closing. Others terminate on the later of the announcement or the actual closing. Shares scheduled to sell during the pre-closing period may still execute; shares scheduled after closing do not.
• Conversion and substitution provisions. In a stock-for-stock merger, your employer stock may be converted into acquirer stock at a fixed ratio. Some plans have substitution provisions that allow the plan to continue against the acquirer stock post-close at the exchange ratio. Most do not — and absent such a provision, a plan written against "XYZ Corp common stock" terminates when XYZ Corp ceases to exist as an independent entity.
• No merger provision. If the plan document is silent on M&A events, you will need to work with securities counsel and your broker to determine whether and how trades can continue after announcement or after close. Silence creates ambiguity, not permission.

Read your plan document now — before any deal is announced — and understand which of these provisions applies to you. Discovering at announcement that your plan will auto-terminate is manageable if you know in advance. Discovering it after you have already sold shares that the broker should have stopped is not.

What happens at deal close: unexecuted plan balance

When the deal closes, the target company ceases to exist as a public entity. Any unexecuted portion of a 10b5-1 plan against the target's stock has no remaining shares to sell — the plan terminates by operation of the merger, regardless of what the plan document says. For cash mergers, your remaining shares are converted to cash at the merger price; for stock-for-stock mergers, they are converted to acquirer shares. Neither conversion is a "sale" in the Section 16(b) sense for most director and officer insiders (there are specific SEC exemptions for conversions in mergers), but the tax treatment depends on the deal structure and requires coordination with a CPA.

Key items to address before close:

• Tax lot identification. If the plan has been executing for multiple years, your broker should have records of which specific lots were sold and which remain. Confirm these records before close, because the remaining-lot basis will determine your gain on the merger consideration.
• Option and RSU acceleration. Most merger agreements include provisions for accelerated vesting of equity awards. The value of accelerated options and RSUs creates ordinary income in the year of close — stacking on top of any W-2 income for that year. Model this against any plan sales occurring in the same tax year.
• Section 16(b) matchability. If you purchased shares — through an ESPP, 401(k) match, or open-market purchase — within six months of plan sales, the Section 16(b) matching rules may apply. The merger does not reset the six-month lookback. Coordinate with securities counsel on any purchases that could match against plan sales in the six-month window around closing.

Pre-transaction planning: the right time to think about this is before a deal is possible

The executives who navigate M&A cleanest are those who adopted their plans well in advance of any transaction discussions. A plan adopted 12–18 months before a deal announcement:

• Was clearly adopted without MNPI about the specific deal.
• Has already executed several tranches, reducing concentration risk regardless of how the deal unfolds.
• Has a complete record of good-faith adoption, certifications, and pre-plan compliance review — making it straightforward to establish the affirmative defense if the SEC reviews the trades.

If you are a senior executive at a company in an industry undergoing significant consolidation, or if your company has been in discussions with strategic acquirers in the past, a 10b5-1 plan adopted during a clear, clean open window is not just a diversification tool — it is risk management for the scenario where the company becomes the target of a bid while you still hold a large stock position.

A fee-only advisor can help you model the right sell schedule, coordinate with your securities counsel and broker, and think through how a change-of-control provision should be drafted (or requested) in your plan document — before any deal is in play.

For related compliance topics, see the 10b5-1 plan rules overview, plan modification and termination guide, Section 16 and Form 4 reporting, and departure planning guide.