Michael Cloonan
CIK 1704336 · President & CEO · last filed 2026-01-06
Michael Cloonan is a President & CEO who has filed 25 SEC Form 4 insider transactions across 3 companies since 2017. The most recent filing, for SION, was dated Jan 6, 2026. Across all open-market trades the lifetime net is −$10.7M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $3.5M across reported positions.
"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.
$3.54M
3
25
-$10.70M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| SION | President & CEO | 547,343 | $6.46 | $3.54M | -$6.33M | 7 | 2026-01-06 |
| bluebird bio, Inc. (BLUE) Delisted | Director | 0 | $4.97 | $0 | $0 | 3 | 2025-06-03 |
| Sage Therapeutics, Inc. (SAGE) Delisted | Chief Business Officer | 3,190 | $8.68 | $27.7K | -$4.38M | 9 | 2021-02-12 |
Recent Filings
25 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-01-06 | SION | Grant (A) | — | $0 | EDGAR |
| 2025-10-22 | SION | Mixed | — | -$3.01M | EDGAR |
| 2025-10-21 | SION | Notice (144) | −99,800 | -$3.21M | EDGAR |
| 2025-10-17 | SION | Mixed | — | -$634.2K | EDGAR |
| 2025-10-16 | SION | Notice (144) | −200 | -$6.2K | EDGAR |
| 2025-10-15 | SION | Notice (144) | −25,000 | -$748.5K | EDGAR |
| 2025-09-30 | SION | Mixed | — | -$575.0K | EDGAR |
| 2025-09-26 | SION | Notice (144) | −25,000 | -$687.5K | EDGAR |
| 2025-08-28 | SION | Mixed | — | -$471.6K | EDGAR |
| 2025-08-26 | SION | Notice (144) | −25,000 | -$601.5K | EDGAR |
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.