William Mariner Greenman
CIK 1377258 · President and CEO · last filed 2026-07-02
"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.
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Disclosed Exposure
$15.03M
Companies
3
Total Filings
76
Lifetime Open-Market Net
-$6.54M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| CERS | President and CEO | 5,154,955 | $2.92 | $15.03M | -$6.47M | 61 | 2026-07-02 |
| CHINOOK THERAPEUTICS, INC. (KDNY) Delisted | Director | 0 | $40.39 | $0 | -$26.9K | 6 | 2023-08-11 |
| CHINOOK THERAPEUTICS, INC. (ADRO) Delisted | Director | 19,835 | — | — | -$41.0K | 9 | 2020-05-28 |
Recent Filings · Page 7 of 8
76 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2012-03-01 | CERS | Mixed | +12,020 | $21.3K | EDGAR |
| 2011-09-02 | CERS | Grant (A) | — | $0 | EDGAR |
| 2011-05-04 | CERS | Buy (P) | +10,000 | $28.2K | EDGAR |
| 2011-04-20 | CERS | Grant (A) | — | $0 | EDGAR |
| 2011-01-12 | CERS | Other (J) | −1,672 | -$4.7K | EDGAR |
| 2010-09-03 | CERS | Grant (A) | — | $0 | EDGAR |
| 2010-01-19 | CERS | Other (J) | −1,746 | -$3.1K | EDGAR |
| 2010-01-08 | CERS | Grant (A) | +7,589 | $0 | EDGAR |
| 2009-10-08 | CERS | Grant (A) | — | $0 | EDGAR |
| 2009-04-27 | CERS | Grant (A) | — | $0 | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.
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.