William Spencer Marshall
CIK 1898468 · Co-Founder and CEO · last filed 2026-09-18
William Spencer Marshall is a Co-Founder and CEO who has filed 38 SEC Form 4 insider transactions across 2 companies since 2021. The most recent filing, for PL, was dated Sep 18, 2026. Across all open-market trades the lifetime net is −$18.8M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $33.7M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
PL.WS price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
645 HARRISON STREET, FLOOR 4
SAN FRANCISCO, CA 94107
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| PL | Co-Founder and CEO | 2,488,473 | $13.56 | $33.74M | -$5.18M | 4 | 2026-09-18 |
| Planet Labs PBC (PL.WS) Delisted | Co-Founder and CEO | 3,037,726 | $23.71 | $72.02M | -$13.59M | 30 | 2026-04-24 |
Recent Filings
38 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-09-18 | PL | Gift (G) | −80,000 | $0 | EDGAR |
| 2026-09-17 | PL | Tax (F) | −134,642 | -$2.16M | EDGAR |
| 2026-07-13 | PL | Sell (S) | −200,000 | -$5.18M | EDGAR |
| 2026-07-10 | PL | Notice (144) | −200,000 | -$5.44M | EDGAR |
| 2026-06-17 | PL | Tax (F) | −134,641 | -$4.12M | EDGAR |
| 2026-04-24 | Planet Labs PBC (PL.WS) Delisted | Gift (G) | −155,000 | $0 | EDGAR |
| 2026-04-08 | Planet Labs PBC (PL.WS) Delisted | Sell (S) | −200,000 | -$7.01M | EDGAR |
| 2026-04-06 | PL | Notice (144) | −200,000 | -$7.18M | EDGAR |
| 2026-03-23 | Planet Labs PBC (PL.WS) Delisted | Mixed | +38,172 | -$1.07M | EDGAR |
| 2026-03-16 | Planet Labs PBC (PL.WS) Delisted | Mixed | +271,045 | -$3.03M | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.