MOSSLER MARK

PrivateCIK: 1992219
Location

WATERTOWN, MA

Senior insider sale

Chief Accounting Officer at C4 THERAPEUTICS, INC. — senior position signals high conviction

$35.5K

9.09K shares

What this filing means

MOSSLER MARK plans to sell 9.09K shares of C4 THERAPEUTICS, INC. valued at approximately $35.5K. Form 144 is a notice of intent to sell restricted or control securities — not a mandatory transaction. This filing provides advance warning of potential selling pressure.

InsiderMOSSLER MARKCIK 1992219
IssuerC4 THERAPEUTICS, INC.CIK 1662579
Officer· Chief Accounting Officer
Since Feb 2026
9.09K
Shares to sell
$35.5K
Approx. market value
29.08K
Acquired (3 months)
1
Planned
Securities Acquired — Last 3 Months1
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Grant under Issuer's 2020 Equity Incentive Plan

These securities were acquired pursuant to an option grant under the Issuer's 2020 Equity Incentive Plan. 29,080 options were granted on February 14, 2025, of which 9,087 vested and were exercised and sold pursuant to a same-day sale transaction.

2/14/2025
29.08K
Total acquired29.08K
Planned & Completed Dispositions1
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NasdaqPlanned

Units to sell

9.09K

Market value

$35.5K

5/27/2026
Total

Units

9.09K

Value

$35.5K

MOSSLER MARK — Planned Insider Sale (Form 144) | Finecho