William Mariner Greenman insider trades: Cerus (CERS) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where William reports to the SEC
Open-market buys and sales
23 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | CERS | ↓ Sell10b5-1 | 101,919 | $2.94 | $300K | Direct | Jul 2, 2026 (2d) |
| Mar 12, 2026 | CERS | ↓ Sell10b5-1 | 447,757 | $1.66 | $742K | Direct | Mar 16, 2026 (4d) |
| Mar 6, 2026 | CERS | ↓ Sell | 78,187 | $2.01 | $157K | Direct | Mar 9, 2026 (3d) |
| Mar 14, 2025 | CERS | ↓ Sell | 193,913 | $1.45 | $281K | Direct | Mar 17, 2025 (3d) |
| Mar 7, 2025 | CERS | ↓ Sell | 60,984 | $1.50 | $91K | Direct | Mar 10, 2025 (3d) |
| Mar 4, 2025 | CERS | ↓ Sell10b5-1 | 23,023 | $1.55 | $36K | Direct | Mar 5, 2025 (1d) |
| Mar 14, 2024 | CERS | ↓ Sell10b5-1 | 125,926 | $2.04 | $256K | Direct | Mar 14, 2024 (0d) |
| May 30, 2023 | KDNY | ↓ Sell | 1,155 | $23.30 | $27K | Direct | May 31, 2023 (1d) |
| Mar 13, 2023 | CERS | ↓ Sell | 60,480 | $2.80 | $169K | Direct | Mar 14, 2023 (1d) |
| Mar 14, 2022 | CERS | ↓ Sell | 165,021 | $5.04 | $832K | Direct | Mar 15, 2022 (1d) |
| Feb 25, 2022 | CERS | ↓ Sell | 308,263 | $5.70 | $1.8M | Direct | Mar 1, 2022 (4d) |
| Mar 15, 2021 | CERS | ↓ Sell10b5-1 | 156,407 | $6.38 | $998K | Direct | Mar 16, 2021 (1d) |
| Mar 17, 2020 | CERS | ↓ Sell10b5-1 | 108,011 | $3.59 | $388K | Direct | Mar 24, 2020 (7d) |
| Jun 4, 2019 | CERS | ↑ Buy | 10,000 | $4.60 | $46K | Direct | Jun 4, 2019 (0d) |
| Mar 13, 2019 | CERS | ↓ Sell | 45,459 | $6.00 | $273K | Direct | Mar 13, 2019 (0d) |
| Mar 13, 2018 | CERS | ↓ Sell | 17,766 | $4.94 | $88K | Direct | Mar 13, 2018 (0d) |
| Mar 15, 2017 | CERS | ↓ Sell | 8,786 | $4.21 | $37K | Direct | Mar 15, 2017 (0d) |
| Nov 30, 2015 | ADRO | ↓ Sell | 3,000 | $30.65 | $92K | Direct | Dec 2, 2015 (2d) |
| Apr 20, 2015 | ADRO | ↑ Buy | 3,000 | $17.00 | $51K | Direct | Apr 22, 2015 (2d) |
| Nov 10, 2014 | CERS | ↑ Buy | 21,800 | $3.93 | $86K | Direct | Nov 12, 2014 (2d) |
| Nov 19, 2012 | CERS | ↑ Buy | 3,200 | $3.02 | $10K | Direct | Nov 20, 2012 (1d) |
| Nov 16, 2012 | CERS | ↑ Buy | 13,800 | $2.85 | $39K | Direct | Nov 16, 2012 (0d) |
| May 3, 2011 | CERS | ↑ Buy | 10,000 | $2.83 | $28K | Direct | May 4, 2011 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other CERS insiders
Open-market trades in the last 12 months
About William Mariner Greenman's insider trades
William Mariner Greenman is President and CEO at Cerus (CERS). Since May 3, 2011, William has reported 6 open-market purchases worth $260K and 17 sales worth $6.5M on SEC Form 4. In the last 12 months: 3 sales ($1.2M).
6 sales (42% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include grants and awards (39 filings), option exercises (25 filings), other transactions (4 filings), shares returned to the company (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every CERS insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.