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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 $3.1M across reported positions. 14 SEC filings were submitted jointly with BIOMARIN PHARMACEUTICAL INC.

"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

$3.06M

Companies

5

Total Filings

62

Lifetime Open-Market Net

-$619.5K

Filer Profile

Reported Address
C/O BIOMARIN PHARMACEUTICAL INC.
105 DIGITIAL DRIVE
NOVATO, CA 94949
Related Filers
BIOMARIN PHARMACEUTICAL INC — 14 joint filings, latest 2026-06-04
AMGEN INC — 2 joint filings, latest 2004-12-15
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

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 $5.01 $8.0K $0 11 2026-07-10
MGX Director — $1.16 — $0 3 2026-06-11
BMRN Director 46,440 $65.68 $3.05M -$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
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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.