DERE WILLARD H

PrivateCIK: 1311569
Location

NOVATO, CA

DERE WILLARD H reported 1 transaction at MERSANA THERAPEUTICS, INC.

Review the transaction codes below to understand the nature of each event.

InsiderDERE WILLARD HCIK 1311569
→
Director
Since Jan 2019
-13.56K
Net shares
Net seller
$0.00
Total acquired
0
Open market trades
0B · 0S
13
Total transactions
13.56K disposed
Non-Derivative Transactions1

Common Stock

Direct
U · U

Shares

−1.57K

Price / share

—

Trade value

—

% of position

New position
1/6/2026
1.57K→0.00
Total

Net shares

−1.57K

Net value

$0.00

Derivative Transactions12

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

2.46K shares

Shares

−2.46K

Strike price

9.0775

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

800.00 shares

Shares

−800.00

Strike price

434.50

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

544.00 shares

Shares

−544.00

Strike price

107.75

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

1K shares

Shares

−1K

Strike price

107.75

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

450.00 shares

Shares

−450.00

Strike price

134.00

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

368.00 shares

Shares

−368.00

Strike price

572.50

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

125.00 shares

Shares

−125.00

Strike price

527.25

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

1K shares

Shares

−1K

Strike price

372.50

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

513.00 shares

Shares

−513.00

Strike price

161.00

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

1.80K shares

Shares

−1.80K

Strike price

90.50

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

734.00 shares

Shares

−734.00

Strike price

216.00

Held after

0.00

Exercisable

—

1/6/2026

Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

2.20K shares

Shares

−2.20K

Strike price

56.50

Held after

0.00

Exercisable

—

1/6/2026
DERE WILLARD H — Insider Transaction (Form 4) Filed Jan 6, 2026 | Finecho