Home

Thomas J. Gunderson

CIK 1708144 · last filed 2026-06-17

Thomas J. Gunderson is a corporate insider who has filed 25 SEC Form 4 insider transactions across 2 companies since 2018. The most recent filing, for TMDX, was dated Jun 17, 2026. Across all open-market trades the lifetime net is −$2.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $7.4M 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.

Loading insider history…
Disclosed Exposure

$7.43M

Companies

2

Total Filings

25

Lifetime Open-Market Net

-$2.10M

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
TMDX Director 26,266 $80.21 $2.11M -$722.4K 9 2026-06-17
MMSI Director 60,741 $87.69 $5.33M -$1.38M 13 2026-05-21

Recent Filings

25 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
2026-06-17 TMDX Mixed +9,661 -$679.8K EDGAR
2026-06-15 TMDX Notice (144) −9,624 -$722.4K EDGAR
2026-05-22 TMDX Grant (A) +2,922 $0 EDGAR
2026-05-21 MMSI Exer (M) +21,250 $1.11M EDGAR
2026-05-19 MMSI Grant (A) +3,457 $0 EDGAR
2025-05-23 TMDX Grant (A) +2,134 $0 EDGAR
2025-05-19 MMSI Grant (A) +2,152 $0 EDGAR
2025-03-03 MMSI Mixed +12,194 -$17.5K EDGAR
2025-02-28 MMSI Notice (144) −12,806 -$1.26M EDGAR
2024-05-28 TMDX Grant (A) +732 $0 EDGAR
Showing 1–10 of 25
Page 1 of 3
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.