William Spencer Marshall
Co-Founder and CEO at Planet Labs PBC
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: Planet Labs PBC, 3 years.
Planet Labs PBC
Director · Co-Founder and CEO
Chief executive roles
Planet Labs PBC
· Co-Founder and CEO
Dates unknown
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Jul 10, 2026 | Planet Labs PBC | Open-market sale | −200,000 | $25.92 | $5,183,940 |
| Jun 15, 2026 | Planet Labs PBC | Shares withheld for tax | −134,641 | $30.58 | $4,117,322 |
| Apr 22, 2026 | Planet Labs PBC | Gift | −155,000 | — | — |
| Apr 6, 2026 | Planet Labs PBC | Open-market sale | −200,000 | $35.07 | $7,014,000 |
| Mar 19, 2026 | Planet Labs PBC | Grant or award | +77,744 | — | — |
| Mar 19, 2026 | Planet Labs PBC | Shares withheld for tax | −39,572 | $26.96 | $1,066,861 |
| Mar 15, 2026 | Planet Labs PBC | Shares withheld for tax | −122,167 | $24.79 | $3,028,520 |
| Mar 12, 2026 | Planet Labs PBC | Grant or award | +393,212 | — | — |
| Feb 3, 2026 | Planet Labs PBC | Option exercise | +123,900 | — | — |
| Feb 3, 2026 | Planet Labs PBC | Shares withheld for tax | −63,041 | $23.95 | $1,509,832 |
| Jan 21, 2026 | Planet Labs PBC | Option exercise | +123,897 | — | — |
| Jan 21, 2026 | Planet Labs PBC | Shares withheld for tax | −63,039 | $26.38 | $1,662,969 |
| Jan 13, 2026 | Planet Labs PBC | Option exercise | +247,794 | — | — |
| Jan 13, 2026 | Planet Labs PBC | Shares withheld for tax | −120,522 | $25.32 | $3,051,617 |
| Dec 26, 2025 | Planet Labs PBC | Open-market sale | −200,000 | $19.36 | $3,872,000 |
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