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Red Flags

Filings a company makes when something has gone wrong, or is about to: a missed reporting deadline (NT 10-K/Q), a delisting from its exchange (Form 25), a deregistration that ends SEC reporting altogether (Form 15), or an insider's notice of intent to sell restricted stock (Form 144). Any one can be routine — Form 144s are filed constantly, and a late filing is sometimes just a late filing — so what is worth reading here is the pattern and the timing.

Insider sale notices · 9
Notable Mark Mossler filed notice of proposed sale August 14, 2026

4,139 shares · $17,605 · via Morgan Stanley Smith Barney LLC Executive Financial Services · Officer

Notable JAY GELDMACHER filed notice of proposed sale August 14, 2026

82,563 shares · $1,899,926 · via Morgan Stanley Smith Barney LLC Executive Financial Services · Former REZI CEO

7 more red-flag filings behind a free account

See every red-flag filing C4 Therapeutics, Inc. has made, with the filing behind each one.

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