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C4 Therapeutics, Inc.

For the period ended Dec 31, 2025. Filed Feb 26, 2026.

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About this filing

A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 26, 2026

CCCC$3.10+5.1%Stored close · as of Nov 6, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Contents

Item 9B. Other Information

Rule 10b5-1 Trading Plans

During the fiscal year ended December 31, 2025, none of our directors and officers (as defined in Rule 16a-1(f) under the Exchange Act)adopted, modified orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Item 408(a) of Regulation S-K.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.