Thomas DesRosier
CIK 1435744 · See Remarks · last filed 2026-05-19
Thomas DesRosier is a corporate insider who has filed 44 SEC Form 4 insider transactions across 5 companies since 2008. The most recent filing, for MCRB, was dated May 19, 2026. Across all open-market trades the lifetime net is −$1.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $45.8K 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.
$45.8K
5
44
-$1.03M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| MCRB | See Remarks | 8,033 | $5.70 | $45.8K | -$92.5K | 24 | 2026-05-19 |
| ARIAD PHARMACEUTICALS INC (ARIA) Delisted | EVP, General Counsel | 55,000 | — | — | $0 | 3 | 2016-03-30 |
| CUBIST PHARMACEUTICALS INC (CBST.Z) Delisted | EVP, Chief Legal | 0 | — | — | $0 | 7 | 2015-01-21 |
| CUBIST PHARMACEUTICALS INC (CBST) Delisted | SVP, Chief Legal Officer & GC | 191 | — | — | $0 | 3 | 2013-10-02 |
| GENZYME CORP (GENZ) Delisted | Sr VP, General Counsel | 11,571 | — | — | -$937.1K | 7 | 2011-04-06 |
Recent Filings
44 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-19 | MCRB | Mixed | +165 | -$595 | EDGAR |
| 2026-03-06 | MCRB | Grant (A) | — | $0 | EDGAR |
| 2026-02-18 | MCRB | Mixed | +166 | -$661 | EDGAR |
| 2025-11-18 | MCRB | Mixed | +168 | -$1.3K | EDGAR |
| 2025-08-19 | MCRB | Mixed | +168 | -$1.3K | EDGAR |
| 2025-05-19 | MCRB | Mixed | +165 | -$575 | EDGAR |
| 2025-02-19 | MCRB | Mixed | +7,264 | -$3.5K | EDGAR |
| 2025-02-11 | MCRB | Grant (A) | — | $0 | EDGAR |
| 2024-11-19 | MCRB | Mixed | +1,778 | -$475 | EDGAR |
| 2024-10-29 | MCRB | Mixed | +9,241 | -$2.9K | EDGAR |