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WG

William Mariner Greenman

CERS
PRESIDENT AND CEO · CERUS CORP · CIK 0001377258
FILING MIX · LIFETIME42%/58%
BUYS
30
SELLS
41
TOTAL VALUE
$10.91M
COMPANIES
1
ACTIVE SINCE
Mar 2020
HOLDINGS NOW
5,154,955
AVG SELL PX
$3.63
TRADE KIND
SHOWING 71 / 71
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
21 backtested trades · 8 horizons · 10 pending
Forward-return performance of every backtestable P/S trade by William Mariner Greenman, 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
7d21+57.14%+0.57%+0.44%+0.13%-2.07%—
14d21+57.14%+1.18%+1.44%-0.26%-5.81%—
30d21+66.67%+1.38%+2.87%-1.49%-5.72%—
60d21+57.14%+1.66%+3.85%-2.20%-8.92%—
90d21+71.43%+6.99%+5.78%-0.34%-9.56%—
180d21(2 pending)+78.95%-1.74%+12.41%-14.15%-16.38%—
1y21(2 pending)+63.16%-5.05%+18.08%-23.13%-33.40%—
2y21(6 pending)+80.00%-30.22%+34.97%-65.19%-55.96%—
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
CERS · 5,154,955 shares · as of Jun 30, 2026
01,381,1092,762,2194,143,3285,524,437202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 30 buys / 41 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
CERS
CERUS CORP
SALEGRANT
Stock grant
192,500——5,154,955Jun 30, 2026Jul 2, 2026 ↗View →
CERS
CERUS CORP
SALE10b5-1
10b5-1 plan
101,919$2.94$299.9K5,053,036Jun 30, 2026Jul 2, 2026 ↗View →
CERS
CERUS CORP
SALE10b5-1
10b5-1 plan
447,757$1.66$742.0K4,998,493Mar 12, 2026Mar 16, 2026 ↗View →
CERS
CERUS CORP
SALE10b5-1
10b5-1 plan
78,187$2.01$156.8K5,446,250Mar 6, 2026Mar 9, 2026 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
193,270——5,524,437Mar 5, 2026Mar 9, 2026 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
1,200,000——5,331,167Mar 2, 2026Mar 4, 2026 ↗View →
CERS
CERUS CORP
SALE10b5-1
10b5-1 plan
122,827$1.45$178.1K4,115,845Mar 14, 2025Mar 17, 2025 ↗View →
CERS
CERUS CORP
SALE10b5-1
10b5-1 plan
71,086$1.45$103.1K4,238,672Mar 13, 2025Mar 17, 2025 ↗View →
CERS
CERUS CORP
SALE10b5-1
10b5-1 plan
60,984$1.50$91.4K4,309,758Mar 7, 2025Mar 10, 2025 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
165,742——4,370,742Mar 6, 2025Mar 10, 2025 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
975,000——4,205,000Mar 6, 2025Mar 10, 2025 ↗View →
CERS
CERUS CORP
SALE10b5-1
10b5-1 plan
23,023$1.55$35.7K3,230,000Mar 4, 2025Mar 5, 2025 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
57,637——3,253,023Mar 3, 2025Mar 5, 2025 ↗View →
CERS
CERUS CORP
SALE
President and CEO
57,637——0Mar 3, 2025Mar 5, 2025 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
57,637——57,637Feb 26, 2025Feb 28, 2025 ↗View →
CERS
CERUS CORP
SALE
President and CEO
63,611$2.02$128.2K3,181,281Mar 14, 2024Mar 14, 2024 ↗View →
CERS
CERUS CORP
SALE
President and CEO
62,315$2.06$128.2K3,244,892Mar 13, 2024Mar 14, 2024 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
64,666——3,307,207Mar 12, 2024Mar 14, 2024 ↗View →
CERS
CERUS CORP
SALE
President and CEO
64,666——0Mar 12, 2024Mar 14, 2024 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
575,000——3,242,541Mar 1, 2024Mar 5, 2024 ↗View →
CERS
CERUS CORP
SALE
President and CEO
22,732$2.80$63.6K2,658,346Mar 13, 2023Mar 14, 2023 ↗View →
CERS
CERUS CORP
SALE
President and CEO
37,748$2.80$105.7K2,616,411Mar 13, 2023Mar 14, 2023 ↗View →
CERS
CERUS CORP
SALE
President and CEO
107,525——0Mar 12, 2023Mar 14, 2023 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
107,525——2,654,159Mar 12, 2023Mar 14, 2023 ↗View →
CERS
CERUS CORP
SALE
President and CEO
64,667——64,666Mar 12, 2023Mar 14, 2023 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
64,667——2,681,078Mar 12, 2023Mar 14, 2023 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
575,000——2,546,634Mar 1, 2023Mar 3, 2023 ↗View →
CERS
CERUS CORP
SALE
President and CEO
53,702$5.04$270.6K1,935,801Mar 14, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
78,043$5.04$393.3K1,885,141Mar 14, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
33,276$5.04$167.7K1,967,192Mar 14, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
104,362——107,525Mar 12, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
64,667——2,000,468Mar 12, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
104,362——1,989,503Mar 12, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
151,666——1,963,184Mar 12, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
64,667——129,333Mar 12, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
151,666——0Mar 12, 2022Mar 15, 2022 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
217,500——1,811,518Mar 1, 2022Mar 1, 2022 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
435,000——435,000Mar 1, 2022Mar 1, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
215,263$5.69$1.22M1,687,018Feb 25, 2022Mar 1, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
93,000$5.73$532.6K1,594,018Feb 25, 2022Mar 1, 2022 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
380,000$3.75$1.43M1,902,281Feb 25, 2022Mar 1, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
380,000——0Feb 25, 2022Mar 1, 2022 ↗View →
CERS
CERUS CORP
SALE
President and CEO
100,000——0Aug 3, 2021Aug 5, 2021 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
100,000$2.08$208.0K1,518,672Aug 3, 2021Aug 5, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
233,859$6.35$1.49M1,418,672Apr 16, 2021Apr 20, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
550,000——0Apr 16, 2021Apr 20, 2021 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
550,000$2.70$1.49M1,652,531Apr 16, 2021Apr 20, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
52,484$6.38$334.7K1,102,531Mar 15, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
76,272$6.38$486.4K1,050,652Mar 15, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
27,651$6.38$176.3K975,257Mar 15, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
151,667——151,666Mar 12, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
151,667——1,126,924Mar 12, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
104,363——211,887Mar 12, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
71,666——0Mar 12, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
71,666——1,002,908Mar 12, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
104,363——1,155,015Mar 12, 2021Mar 16, 2021 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
380,000——380,000Mar 1, 2021Mar 3, 2021 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
194,000——194,000Mar 1, 2021Mar 3, 2021 ↗View →
CERS
CERUS CORP
SALE
President and CEO
100,000——0Aug 26, 2020Aug 26, 2020 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
100,000$3.00$300.0K925,849Aug 26, 2020Aug 26, 2020 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
151,667——895,059Mar 17, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
SALE
President and CEO
10,936$3.59$39.3K699,590Mar 17, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
28,125——710,526Mar 17, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
SALE
President and CEO
69,210$3.59$248.8K825,849Mar 17, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
SALE
President and CEO
27,865$3.59$100.2K743,392Mar 17, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
PURCHASE
President and CEO
71,667——771,257Mar 17, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
SALE
President and CEO
71,667——71,666Mar 12, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
SALE
President and CEO
28,125——0Mar 12, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
SALE
President and CEO
151,667——303,333Mar 12, 2020Mar 24, 2020 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
316,250——316,250Mar 2, 2020Mar 16, 2021 ↗View →
CERS
CERUS CORP
PURCHASEGRANT
Stock grant
632,500——632,500Mar 2, 2020Mar 16, 2021 ↗View →
Other insiders · CERS
Loading peer insiders…
About this filer
CIK 0001377258
ROLE
President and CEO
PRIMARY
CERS
COMPANIES
1
ACTIVE SINCE
Mar 2020
MARKETPEEL · /INSIDER/0001377258DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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