Option exercise vs. open-market purchase

An option gives its holder the right to acquire shares at a stated exercise price before a deadline. When the option is exercised, the derivative position is used up and the underlying shares are acquired. Under the current Form 4 instructions↗ (opens in a new tab), the derivative disposition is reported in Table II and the resulting holdings in the underlying security are reported in Table I.

That is different from an open-market or private purchase. A code-P purchase records a purchase of a security in a market or private transaction. An exercise can require payment of an exercise price, but that price was set by the option terms; it is not necessarily the current market price, and the decision may also be shaped by expiration, vesting, award terms, or a pre-existing arrangement.

The distinction is classification, not a judgment about the person or issuer. Shares can increase after either event. Beneficial ownership movement alone does not tell you whether fresh capital was committed at the market price, how much discretion existed, or what the reporting person believed about future returns.

These meanings come from Instruction 8↗ (opens in a new tab). The acquired or disposed marker supplies direction, but direction is not a substitute for the code. A code-M acquisition can increase common-stock holdings while disposing of the option; a code-F disposition can settle an exercise price without any market sale.

For the complete code list, use the Form 4 transaction-code reference.

Form 4 requires transactions to be reported on separate lines, and exercises often touch both non-derivative and derivative tables. The right unit of analysis may therefore be a set of related rows rather than the largest line on the page.

Elon Musk’s Tesla Form 4 filed June 17, 2026↗ (opens in a new tab) reported one integrated June 16 option-exercise and settlement event across common stock and a non-qualified stock option.

1. Code M recorded the exercise. The filing reported 303,960,630 shares acquired at the option’s $23.34 exercise price under the 2018 CEO Performance Award.
2. Code F recorded the settlement leg. Tesla withheld 17,531,857 shares at $404.66 in net share settlement of the exercise price. The filing does not describe this leg as tax withholding.
3. The footnote ruled out a market sale. It states that the transaction did not involve any open-market sales of securities.
4. The surrounding terms supplied context. The exercise followed an April 21, 2026 implementation agreement and a June 9 exercise notice. The acquired shares were restricted stock scheduled to vest January 19, 2028, subject to the disclosed service condition.
5. Post-event ownership completed the mechanics. Direct ownership after the code-F leg was 710,172,677 shares. The Rule 10b5-1 checkbox was not checked.

The accurate first description is an option exercise with issuer withholding to settle the exercise price—not an open-market purchase and not an open-market sale. That statement classifies the filing; it is not a view on Tesla or a claim about Musk’s motive.

Read the full Tesla Case File for the preserved historical read, later source qualification, timeline, and complete public evidence record. Those sections are not duplicated here.

“Not a code-P purchase” does not mean “ignore every exercise.” It means the exercise must be evaluated on its own terms. Useful questions include:

• What were the post-exercise holdings? Compare the final holdings figure with the exercise and any disposition rows.
• Were the underlying shares held or sold immediately? A code-S row can show a market sale; code F can show issuer withholding. They are different mechanics.
• Was an exercise deadline approaching? Expiration can narrow the holder’s choices even when the timing still contains some discretion.
• What did the plan or award terms require? Vesting, service conditions, exercise notices, and pre-existing arrangements can explain part of the sequence.
• How large was the event relative to prior ownership? Transaction size and retained exposure are different from the dramatic gross share count.
• Which elements were discretionary and which were mechanical? Separate the choice to exercise from issuer withholding, automatic settlement, or required vesting terms when the filing supports that distinction.

These facts can refine an interpretation. They still do not make the filing a statement of intent or establish what happens next.

• most or all newly acquired shares were sold in a related code-S row;
• shares were withheld by the issuer under code F and the headline treats them as a market sale;
• the option was near expiration or the award terms constrained timing;
• the increase came from a code-A award rather than a purchase;
• the exercise is small relative to existing ownership or compensation;
• footnotes reveal restrictions, settlement mechanics, or other non-market terms;
• the description relies on gross shares while ignoring final holdings and offsetting rows.

The filing also does not prove motive, future returns, current-price conviction, or an investment recommendation. Those limits should remain visible even when the exercise appears unusual.

1. Find every row on the same date. Check Table I and Table II.
2. Read each code and A/D marker. Do not infer “buy” from acquisition alone.
3. Match the option to the underlying shares. Confirm exercise price, expiration, and shares underlying the derivative.
4. Identify F or S dispositions separately. Read the footnote for withholding purpose; treat code S as the sale row it is.
5. Calculate retained shares only from compatible rows. Do not blend prices or opposite-direction legs.
6. Read holdings after the transaction. Separate gross movement from final exposure.
7. Check plan, award, vesting, and deadline terms. State only what the filing supports.
8. Label the limits. Leave motive, future performance, and recommendation outside the filing fact set.