BOBULSKY SUSAN 4
4 · Adaptive Biotechnologies Corp · Filed Mar 13, 2026
Research Summary
AI-generated summary of this filing
Adaptive Biotechnologies (ADPT) CCO Susan Bobulsky Sells Shares
What Happened
Susan Bobulsky, Chief Commercial Officer of Adaptive Biotechnologies (ADPT), sold 41,338 shares on 2026-03-11 at $13.17 per share, generating proceeds of $544,421. The Form 4 lists the transaction as a sale (S) and the filing was made on 2026-03-13.
Key Details
- Transaction date & price: 2026-03-11, 41,338 shares @ $13.17 each (total $544,421)
- Transaction type: Sale (reported as open market/private sale) with footnote indicating a "sell-to-cover" for tax withholding (see below)
- Footnote: F1 — Shares were sold to satisfy tax withholding obligations on vested RSUs; this was a mandated sell-to-cover, not a discretionary trade by the reporting person
- Shares owned after transaction: Not disclosed in the provided excerpt of the filing
- Filing timeliness: Reported on 2026-03-13 for a 2026-03-11 transaction — appears to be timely
Context
Sell-to-cover transactions occur when an issuer's equity plan requires withholding taxes on RSU vesting to be satisfied by selling a portion of the vested shares. These mandatory sales are routine and generally do not signal a change in the insider's view of the company. Purchases by insiders typically carry more weight for signaling than routine tax-withholding sales.
Insider Transaction Report
- Sale
Common Stock
[F1]2026-03-11$13.17/sh−41,338$544,421→ 427,775 total
Footnotes (1)
- [F1]This transaction represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.