Home

Willard H Dere

CIK 1311569 · last filed 2026-07-10

Willard H Dere is a corporate insider who has filed 62 SEC Form 4 insider transactions across 5 companies since 2014. The most recent filing, for MCRB, was dated Jul 10, 2026. Across all open-market trades the lifetime net is −$619.5K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.9M 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

$2.89M

Companies

5

Total Filings

62

Lifetime Open-Market Net

-$619.5K

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 Director 1,587 $4.80 $7.6K $0 11 2026-07-10
MGX Director — $1.21 — $0 3 2026-06-11
BMRN Director 46,440 $62.07 $2.88M -$547.6K 13 2026-06-04
Mersana Therapeutics, Inc. (MRSN) Delisted Director 0 $29.08 $0 $0 17 2026-01-06
Radius Health, Inc. (RDUS) Delisted Director 1,895 $30.00 $56.9K -$71.9K 15 2022-08-15

Recent Filings

62 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
2026-06-11 MGX Grant (A) — $0 EDGAR
2026-06-04 BMRN Grant (A) +7,490 $0 EDGAR
2026-01-06 Mersana Therapeutics, Inc. (MRSN) Delisted Mixed −1,567 $0 EDGAR
2025-06-13 Mersana Therapeutics, Inc. (MRSN) Delisted Grant (A) — $0 EDGAR
2025-06-12 MGX Grant (A) — $0 EDGAR
2025-05-22 BMRN Grant (A) +6,650 $0 EDGAR
2025-04-11 MCRB Grant (A) — $0 EDGAR
2024-06-12 Mersana Therapeutics, Inc. (MRSN) Delisted Grant (A) — $0 EDGAR
2024-05-23 BMRN Grant (A) +4,720 $0 EDGAR
Showing 1–10 of 62
Page 1 of 7
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.