On August 12, while most of crypto was still arguing about where Bitcoin would settle, Brian Armstrong signed a document that fixed, in advance, how much of his Coinbase stake he could sell. The arrangement sat inside a routine filing until October 29, when Coinbase’s third-quarter 10-Q report landed with the Securities and Exchange Commission. Item 5 of that filing discloses three pre-arranged trading plans covering up to 13,594,519 shares of Class A common stock across three of the company’s most senior figures: Chief Executive Officer Armstrong, co-founder and director Fred Ehrsam, and President and Chief Operating Officer Emilie Choi. At the October 29 closing price of $160.59, the combined ceiling is worth about $2.18 billion.
The plans are 10b5-1 arrangements, the standard mechanism that lets insiders sell on a preset schedule without running afoul of insider-trading rules. Coinbase’s own policy is explicit about it. The filing says directors and officers are “only permitted to trade in the Company’s securities pursuant to a prearranged trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act,” and that all three plans were “entered into during an open trading window in accordance with the Company’s Insider Trading Policy and Trading Plan Policy.”
Three Executives, 13.59 Million Shares
The largest plan belongs to the chief executive. The Armstrong Plan, adopted August 12, 2026, covers the “potential sale of up to 8,167,446 shares of Class A common stock owned by Mr. Armstrong upon the exercise of vested stock options,” with sales able to begin on an estimated start date of November 16, 2026 and run through October 22, 2027. That single plan is 60.08% of the combined total across all three.
The Ehrsam Plan, adopted September 4, covers up to 3,866,620 shares issuable on the conversion of Class B shares held by the Frederick Ernest Ehrsam III Living Trust, from an estimated December 7, 2026 start through June 7, 2027. The Choi Plan, adopted September 8, covers up to 1,560,453 shares spanning directly owned stock, restricted stock units, and shares held by the Starvurst Exempt Trust, from January 4, 2027 through December 31, 2027. That Choi figure nets out shares already sold under a prior plan dated August 12, 2025, so 1,560,453 is the remaining allotment rather than the whole program. All three carry the same condition: sales proceed only “so long as the market price of the Class A common stock satisfies certain threshold prices specified in the Armstrong Plan” — and the filing never discloses what those floors are.
| Plan | Shares (up to) | Adopted | Window |
|---|---|---|---|
| Armstrong Plan | 8,167,446 | Aug 12, 2026 | Nov 16, 2026 – Oct 22, 2027 |
| Ehrsam Plan | 3,866,620 | Sep 4, 2026 | Dec 7, 2026 – Jun 7, 2027 |
| Choi Plan | 1,560,453 | Sep 8, 2026 | Jan 4, 2027 – Dec 31, 2027 |
For scale, Coinbase reported 223,729,527 Class A shares and 41,033,891 Class B shares outstanding as of October 22, 2026, or about 264.76 million in total. The combined 13.59 million shares amount to roughly 6.08% of the Class A float, and Armstrong’s 8.17 million shares alone are about 3.65% of Class A.
Why a 10b5-1 Plan Is Not a Sell Signal
It is easy to read 13.6 million shares and conclude the insiders are heading for the exits. The mechanics point the other way. A 10b5-1 plan is adopted in advance, during an open window, precisely so the person selling is not making a judgment call at the moment of each trade. Armstrong’s plan was adopted August 12, weeks before the late-October Binance hack and the selloff that followed, and it cannot begin until November 16. The threshold-price conditions add a second layer: if COIN trades below the floor, nothing sells.
This is the countercase the filing itself supports. The share figures are ceilings, not commitments. “Up to 8,167,446 shares” means the number actually sold could be far smaller, and any plan can be terminated or amended before a single share changes hands. No executive has sold anything under these plans yet; the earliest possible start is still two weeks away. The structure exists precisely because the SEC tightened Rule 10b5-1 in 2023, adding a mandatory cooling-off period so a plan adopted during a quiet stretch cannot be switched on days later. Insider sales of this shape are, more often than not, estate planning and diversification rather than a vote against the company.
The Friday Selloff That Coincided With the Filing
Coinbase stock closed at $160.59 on October 29, the day the 10-Q landed, then fell 10.6% to $143.54 on October 30, near the bottom of a 52-week range that runs from $136.89 to $342.80. The drop coincided with the filing, but it coincided with a lot else: on the same day crypto assets were still absorbing the fallout from the Binance security breach, and both Bitcoin and Ether were sliding. The available data does not establish that the insider-selling disclosure moved the stock; a broad risk-off session in crypto is at least as plausible an explanation.
What the price action does change is the arithmetic. At the October 29 close the combined plans were worth about $2.18 billion. At the October 30 close of $143.54, the same 13.59 million shares were worth about $1.95 billion, a reminder that the headline dollar figure moves with COIN even while the share count stays fixed.
What to Watch Between Now and November 16
The first concrete signal arrives November 16, when the Armstrong window opens. After that, any actual sale must appear as a Form 4 filing with the SEC within two business days. Ehrsam’s window opens December 7 and Choi’s on January 4. The documents that matter next are not the plans but the Form 4s that follow, which record real dispositions, at real prices, in real time.
There is a second thread worth pulling. Coinbase’s most recent quarterly result, covered here, showed a $719 million profit that was almost entirely a $715 million unrealized crypto gain. That is the context the filing does not spell out: the same company whose executives have teed up roughly $2 billion in potential sales is also booking paper gains on the crypto it holds. Armstrong, who has been publicly bullish on Bitcoin in the past, has now fixed a schedule to reduce his COIN exposure. Whether those two things are in tension depends on which prices hold.
The filing is silent on motive. It does not say why any of the three adopted the plans, what the threshold prices are, or how many shares they actually expect to sell. What it does say is the size, the dates, and the conditions, enough to know what to watch, and not enough to call it a signal.
