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WM

William Spencer Marshall

PL
CO-FOUNDER AND CEO · PLANET LABS PBC · CIK 0001898468
FILING MIX · LIFETIME42%/58%
BUYS
24
SELLS
33
TOTAL VALUE
$34.74M
COMPANIES
1
ACTIVE SINCE
Dec 2021
HOLDINGS NOW
2,903,115
AVG SELL PX
$16.55
TRADE KIND
SHOWING 57 / 57
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
5 backtested trades · 8 horizons · 8 pending
Forward-return performance of every backtestable P/S trade by William Spencer Marshall, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d5+40.00%-4.33%+0.53%-4.85%-6.12%—
14d5+20.00%-2.20%+1.36%-3.57%-1.53%—
30d5+20.00%+0.86%+0.95%-0.09%+1.00%—
60d5+0.00%+4.08%+2.39%+4.82%+2.99%—
90d5(1 pending)+0.00%+27.07%+0.44%+26.63%+24.82%—
180d5(1 pending)+0.00%+33.75%+1.55%+32.19%+19.36%—
1y5(3 pending)+0.00%-26.37%+5.43%-31.80%-31.80%—
2y5(3 pending)+50.00%+114.98%+28.53%+86.45%+86.45%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
PL · 2,903,115 shares · as of Jun 15, 2026
02,936,7255,873,4498,810,17411,746,89820222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 24 buys / 33 sellsCOVERAGE · 19 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
134,641$30.58$4.12M2,903,115Jun 15, 2026Jun 17, 2026 ↗View →
PL
PLANET LABS PBC
SALEGRANT
Gift
155,000——3,037,726Apr 22, 2026Apr 24, 2026 ↗View →
PL
PLANET LABS PBC
SALE10b5-1
10b5-1 plan
200,000$35.07$7.01M3,192,726Apr 6, 2026Apr 8, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
39,572$26.96$1.07M3,392,726Mar 19, 2026Mar 23, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
77,744——3,432,298Mar 19, 2026Mar 23, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
122,167$24.79$3.03M3,354,524Mar 15, 2026Mar 16, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
393,212——3,476,691Mar 12, 2026Mar 16, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
123,900——0Feb 3, 2026Feb 5, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
292,027——0Feb 3, 2026Feb 5, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
123,900——3,146,520Feb 3, 2026Feb 5, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
292,027——11,746,898Feb 3, 2026Feb 5, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
63,041$23.95$1.51M3,083,479Feb 3, 2026Feb 5, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
292,026——292,027Jan 21, 2026Jan 23, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
123,897——3,085,659Jan 21, 2026Jan 23, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
123,897——123,900Jan 21, 2026Jan 23, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
63,039$26.38$1.66M3,022,620Jan 21, 2026Jan 23, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
292,026——11,454,871Jan 21, 2026Jan 23, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
247,794——3,082,284Jan 13, 2026Jan 15, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
584,052——584,053Jan 13, 2026Jan 15, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
247,794——247,797Jan 13, 2026Jan 15, 2026 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
120,522$25.32$3.05M2,961,762Jan 13, 2026Jan 15, 2026 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
584,052——11,162,845Jan 13, 2026Jan 15, 2026 ↗View →
PL
PLANET LABS PBC
SALE10b5-1
10b5-1 plan
200,000$19.36$3.87M2,834,490Dec 26, 2025Dec 30, 2025 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
121,897$18.05$2.20M3,034,490Dec 15, 2025Dec 16, 2025 ↗View →
PL
PLANET LABS PBC
SALE10b5-1
10b5-1 plan
200,000$15.50$3.10M3,156,387Oct 13, 2025Oct 15, 2025 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
121,897$9.86$1.20M3,356,387Sep 15, 2025Sep 16, 2025 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
18,579$9.86$183.2K3,478,284Sep 15, 2025Sep 16, 2025 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
36,586——3,496,863Sep 15, 2025Sep 16, 2025 ↗View →
PL
PLANET LABS PBC
SALEGRANT
Gift
200,000——3,460,277Jul 14, 2025Jul 15, 2025 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
114,980$5.37$617.4K3,660,277Jun 15, 2025Jun 16, 2025 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
166,667——3,851,131Mar 20, 2025Mar 21, 2025 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
75,874$4.24$321.7K3,775,257Mar 20, 2025Mar 21, 2025 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
65,844$4.16$273.9K3,684,464Mar 15, 2025Mar 17, 2025 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
946,970——3,750,308Mar 12, 2025Mar 12, 2025 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
91,661$4.01$367.6K2,803,338Dec 15, 2024Dec 17, 2024 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
69,370$2.15$149.1K2,894,999Sep 15, 2024Sep 17, 2024 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
31,716$1.92$60.9K2,964,369Sep 9, 2024Sep 11, 2024 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
88,889——2,996,085Sep 9, 2024Sep 11, 2024 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
64,531$1.85$119.4K2,907,196Jun 15, 2024Jun 17, 2024 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
64,690——2,994,809Mar 27, 2024Mar 28, 2024 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
23,082$2.55$58.9K2,971,727Mar 27, 2024Mar 28, 2024 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
1,583,711——2,930,119Mar 19, 2024Mar 21, 2024 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
30,634$2.21$67.7K1,346,408Mar 15, 2024Mar 18, 2024 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
28,314$2.45$69.4K1,377,042Dec 15, 2023Dec 18, 2023 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
100,000$2.70$269.8K1,405,356Sep 19, 2023Sep 19, 2023 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
28,314$2.80$79.3K1,305,356Sep 15, 2023Sep 19, 2023 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
50,000——1,350,960Sep 7, 2023Sep 8, 2023 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
17,290$3.08$53.3K1,333,670Sep 7, 2023Sep 8, 2023 ↗View →
PL
PLANET LABS PBC
SALE
Co-Founder and CEO
28,314$3.45$97.7K1,300,960Jun 15, 2023Jun 16, 2023 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
1,310,044——1,329,274Mar 16, 2023Mar 17, 2023 ↗View →
PL
PLANET LABS PBC
PURCHASE
Co-Founder and CEO
19,230$6.47$124.4K19,230Dec 22, 2021Dec 22, 2021 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
1,168,105——1,168,105Dec 7, 2021Dec 9, 2021 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
10,578,793——10,578,793Dec 7, 2021Dec 9, 2021 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
735,282——735,282Dec 7, 2021Dec 9, 2021 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
919,103——919,103Dec 7, 2021Dec 9, 2021 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
2,833,903——2,833,903Dec 7, 2021Dec 9, 2021 ↗View →
PL
PLANET LABS PBC
PURCHASEGRANT
Stock grant
495,591——495,591Dec 7, 2021Dec 9, 2021 ↗View →
Other insiders · PL
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About this filer
CIK 0001898468
ROLE
Co-Founder and CEO
PRIMARY
PL
COMPANIES
1
ACTIVE SINCE
Dec 2021
MARKETPEEL · /INSIDER/0001898468DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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