McMillen Charles Thomas 4

What Happened
Charles Thomas McMillen, a director of Castellum, Inc. (CTM), disposed of 55,000 shares in an open-market sale on March 18, 2026. The shares traded at $0.80 per share, producing total proceeds of $44,099. The Form 4 reporting this transaction was filed on March 20, 2026.

Key Details

• Transaction date and type: March 18, 2026 — open-market sale (Code S).
• Price and size: 55,000 shares at $0.80 per share; total proceeds $44,099.
• Shares owned after transaction: Not specified in the provided filing.
• Footnotes/plan: No 10b5-1 plan, tax-withholding, or other footnotes disclosed in the summary provided.
• Filing timeliness: Form 4 filed March 20, 2026 — two business days after the transaction, which appears to be timely.

Context
This was a sale by a company director; sales can be routine (liquidity, portfolio rebalancing, or other personal reasons) and do not necessarily indicate a change in company fundamentals. Purchases generally carry more informational weight for investors; treat this single sale as a factual record of insider activity rather than a market signal.