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Thomas DesRosier

CIK 1435744 · See Remarks · last filed 2026-07-10

Thomas DesRosier is a corporate insider who has filed 45 SEC Form 4 insider transactions across 5 companies since 2008. The most recent filing, for MCRB, was dated Jul 10, 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 $483.6K 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.

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Disclosed Exposure

$483.6K

Companies

5

Total Filings

45

Lifetime Open-Market Net

-$1.03M

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
MCRB See Remarks 8,033 $4.80 $38.6K -$92.5K 25 2026-07-10
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
GENZ Sr VP, General Counsel 11,571 $38.46 $445.0K -$937.1K 7 2011-04-06

Recent Filings

45 filings
Insider 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
2026-07-10 MCRB Grant (A) — $0 EDGAR
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
Showing 1–10 of 45
Page 1 of 5
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.