Harris Parker, co-founder and CTO of Slack, has filed 39 Form 4 transactions, every one of them tied to Salesforce (CRM), the company that acquired Slack. The direction is unambiguous: Parker has executed zero open-market purchases and has recorded roughly $31.6 million in aggregate sell value. The only outright open-market sale (code S) occurred on December 2, 2025, when Parker disposed of approximately $2.04 million in CRM shares. Across the entire filing history, there are no P-coded purchases, meaning Parker has never deployed personal capital to add shares on the open market.
The rest of the activity is mechanical compensation processing rather than discretionary trading. Month after month, Parker exercises option awards (code M, valued at $0) and immediately surrenders shares to cover tax withholding (code F). Recent filings follow this rhythm: the July 22, 2026 transaction shows $144,418 in shares withheld; June 22, 2026 contains two F events totaling roughly $189,000; and April 22, 2026 includes a $2.62 million withholding alongside a $168,163 event. The March 22, 2026 filing bundles three restricted stock grants (code A) with three F transactions worth about $624,000 combined, all tied to option exercises.
What emerges is a structurally sell-oriented profile, but not an aggressive one. The single December S transaction is the only true market sale in the dataset; the remaining $29.6 million in sell value is largely shares withheld for taxes at exercise, an automatic consequence of vesting rather than a discretionary bet against the stock. With no purchases, no recent S activity since December 2025, and a trailing pattern dominated by F and M codes, Parker's Form 4 history reflects a founder steadily monetizing vested equity in Salesforce — nothing more, nothing less.
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