ASPE · Two ARCH Venture affiliates purchased a combined 1.27 million shares of…

Two ARCH Venture affiliates purchased a combined 1.27 million shares of Aspen Neuroscience at $15 per share on November 2, 2026, totaling $19 million in open-market buys. The purchases are non-10b5-1 and represent a material vote of confidence from the company's largest institutional holders, though no corporate catalyst is disclosed in the filing.

• ARCH Venture Fund X, L.P. purchased 66,667 shares at $15 for $1.0M on 2026-11-02 (open-market, no 10b5-1 plan)
• ARCH Venture Partners XIV, L.P. purchased 1,200,000 shares at $15 for $18.0M on 2026-11-02 (open-market, no 10b5-1 plan)
• Total open-market purchases: $19.0M from two 10% owner affiliates
• Additional non-cash derivative conversions by ARCH entities and a director occurred on the same date, totaling zero economic value