Willard H. Dere
CIK: 0001311569
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (20 total)
- Jul 8, 2026MCRB
Seres Therapeutics, Inc.
Award(A)DirectStock Option (right to buy)
6.5K shares- - Jun 9, 2026MGX
Metagenomi Therapeutics, Inc.
Award(A)DirectStock Option (Right to Buy)
21K shares- - Jun 2, 2026BMRN
BIOMARIN PHARMACEUTICAL INC
Award(A)Direct7.5K shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
2.5K shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
800 shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
544 shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
1K shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
450 shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
368 shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
125 shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
1K shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
513 shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
1.8K shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
734 shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Disposition(D)DirectStock Option (right to buy)
2.2K shares- - Jan 6, 2026MRSN
Mersana Therapeutics, Inc.
Tender Offer(U)Direct1.6K shares- - Jun 12, 2025MRSN
Mersana Therapeutics, Inc.
Award(A)DirectStock Option (right to buy)
61.5K shares- - Jun 10, 2025MGX
Metagenomi, Inc.
Award(A)DirectStock Option (Right to Buy)
21K shares- - May 20, 2025BMRN
BIOMARIN PHARMACEUTICAL INC
Award(A)Direct6.7K shares- - Apr 10, 2025MCRB
Seres Therapeutics, Inc.
Award(A)DirectStock Option (right to buy)
100K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Jul 8, 2026 |  MCRB Seres Therapeutics, Inc. | Award(A) Stock Option (right to buy) | 6,500 | - | - | Direct |
| Jun 9, 2026 |  MGX Metagenomi Therapeutics, Inc. | Award(A) Stock Option (Right to Buy) | 21,000 | - | - | Direct |
| Jun 2, 2026 |  BMRN BIOMARIN PHARMACEUTICAL INC | Award(A) | 7,490 | - | $0 | Direct |
| Jan 6, 2026 |  MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 2,460 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 800 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 544 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 1,000 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 450 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 368 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 125 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 1,002 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 513 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 1,800 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 734 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Disposition(D) Stock Option (right to buy) | 2,200 | - | - | Direct |
| Jan 6, 2026 | MRSN Mersana Therapeutics, Inc. | Tender Offer(U) | 1,567 | - | $0 | Direct |
| Jun 12, 2025 | MRSN Mersana Therapeutics, Inc. | Award(A) Stock Option (right to buy) | 61,500 | - | - | Direct |
| Jun 10, 2025 | MGX Metagenomi, Inc. | Award(A) Stock Option (Right to Buy) | 21,000 | - | - | Direct |
| May 20, 2025 | BMRN BIOMARIN PHARMACEUTICAL INC | Award(A) | 6,650 | - | - | Direct |
| Apr 10, 2025 | MCRB Seres Therapeutics, Inc. | Award(A) Stock Option (right to buy) | 100,000 | - | - | Direct |
1-20 of 20 transactions
About Dere Willard H
Dere Willard H (SEC CIK 0001311569) files insider reports with the SEC as Director of Seres Therapeutics, Inc. (MCRB), Director of Metagenomi Therapeutics, Inc. (MGX) and Director of BIOMARIN PHARMACEUTICAL INC (BMRN). Signal8 also holds filings tied to 1 other company.
Signal8 holds 8 ownership filings by Dere Willard H, all Form 4s, filed between Apr 11, 2025 and Jul 10, 2026. Those filings report 20 transactions, from Apr 10, 2025 to Jul 8, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Dere Willard H's filings is in CAMBRIDGE, MA.
Recent filings by Dere Willard H
- Jul 8, 2026: Grant or award of MCRB derivative securities (Form 4, code A).
- Jun 9, 2026: Grant or award of MGX derivative securities (Form 4, code A).
- Jun 2, 2026: Grant or award of BMRN shares (Form 4, code A).
- Jan 6, 2026: Disposition to issuer transactions of MRSN derivative securities (12 lines, Form 4, code D).
- Jan 6, 2026: Tender of shares transaction of MRSN shares (Form 4, code U).