William Mariner Greenman Net Worth
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William Mariner Greenman has an estimated net worth of at least $10.3 million*, as of Oct. 8, 2025. They own 4.1 million shares of CERS stock. They have sold 938,765 shares of CERS stock since 2021, for an estimated $3.4 million.
William Mariner Greenman $CERS SEC Form 4 Insider Trading
William Mariner Greenman has filed a total of 13 insider trades in $CERS since 2021. Their most recent trade was a sale of 71,086 shares, made on Mar 13, 2025. Their largest trade was a sale of 215,263 shares, made on Feb 25, 2022. We estimate that they now own 4.1 million shares of $CERS, worth an estimated $6.8 million.
Insider Trading at $CERS
There have been a total of 108 insider trades reported at $CERS since 2021, with 101,075 shares purchased and 2.8 million shares sold. The most active insider traders in $CERS stock have been Richard J Benjamin, Kevin Dennis Green, and William Mariner Greenman. The most recent trade was a sale of 55,000 shares reported by Chrystal Jensen (Chief Legal Officer), made on Nov 24, 2025.
History of Insider Stock Trades by William Mariner Greenman
| Company Ticker | Purchase / Sale | Shares | Date | Disclosed (EST) |
|---|---|---|---|---|
CERS
|
Sale | 71,086 | Mar 13, 2025 | March 17, 2025, 5 p.m. |
|
CERS
|
Sale | 122,827 | Mar 14, 2025 | March 17, 2025, 5 p.m. |
|
CERS
|
Sale | 60,984 | Mar 07, 2025 | March 10, 2025, 7:55 p.m. |
|
CERS
|
Sale | 23,023 | Mar 04, 2025 | March 5, 2025, 9:29 p.m. |
|
CERS
|
Sale | 63,611 | Mar 14, 2024 | March 14, 2024, 9:30 p.m. |
|
CERS
|
Sale | 62,315 | Mar 13, 2024 | March 14, 2024, 9:30 p.m. |
KDNY
|
Sale | 1,155 | May 30, 2023 | May 31, 2023, 7:26 p.m. |
|
CERS
|
Sale | 37,748 | Mar 13, 2023 | March 14, 2023, 7:47 p.m. |
|
CERS
|
Sale | 22,732 | Mar 13, 2023 | March 14, 2023, 7:47 p.m. |
|
CERS
|
Sale | 78,043 | Mar 14, 2022 | March 15, 2022, 10 p.m. |
|
CERS
|
Sale | 53,702 | Mar 14, 2022 | March 15, 2022, 10 p.m. |
|
CERS
|
Sale | 33,276 | Mar 14, 2022 | March 15, 2022, 10 p.m. |
|
CERS
|
Sale | 215,263 | Feb 25, 2022 | March 1, 2022, 10:18 p.m. |
|
CERS
|
Sale | 93,000 | Feb 25, 2022 | March 1, 2022, 10:18 p.m. |
$CERS Executives and Stock Owners with Insider Trades
-
Richard J Benjamin, Chief Medical Officer
-
Kevin Dennis Green, Chief Financial Officer
-
William Mariner Greenman, President and CEO
-
Vivek K Jayaraman, Chief Operating Officer
-
Chrystal Jensen, Chief Legal Officer
-
Carol Moore, SVP Reg. & Quality
-
Chrystal Menard, Chief Legal Officer
-
Laurence M Corash, Chief Scientific Officer
*This is only based off of information found in SEC filings, and may not reflect actual net worth. There may also be inaccuracies due to privately holdings filing errors, parsing errors, accidental double-counting of shares, incorrect classification of indirectly owned shares, sales prior to dataset start date, or any other number of issues.