Core Insights - Several biotech companies experienced significant stock price increases in after-hours trading, driven by clinical updates, strategic shifts, and upcoming catalysts [1] Cassava Sciences (SAVA) - Shares surged 37.1% to $3.18 in after-hours trading, following a regular session close of $2.32, which marked a 1.75% gain [2] - The rally is attributed to renewed interest in the investigational drug simufilam, particularly its potential in treating TSC-related epilepsy, following positive preclinical data [3] - Leadership changes, including the appointment of Dr. Joseph Hulihan as Chief Medical Officer, indicate a strategic pivot in clinical priorities [3] - Future updates on simufilam and the diagnostic candidate SavaDx could serve as near-term catalysts [4] Helius Medical Technologies (HSDT) - Stock rose 15.67% to $18.53 in after-hours trading after a regular session close of $16.02, where it had dropped 33.61% [4] - The rebound followed a $500 million private placement announcement, marking a significant pivot from its core neurotech focus [5] - Helius continues to advance its medical device pipeline, with positive results from the Portable Neuromodulation Stimulator (PoNS) stroke registrational program and plans for FDA submission [6] Werewolf Therapeutics (HOWL) - Shares increased 9.78% to $2.02 in after-hours trading, following a regular session close of $1.84, which was up 23.49% [6] - The company is advancing multiple conditionally activated cytokine therapies through its INDUKINE platform, with lead candidate WTX-124 in a Phase 1/1b trial targeting advanced solid tumors [7] - Participation in the H.C. Wainwright 27th Annual Global Investment Conference highlighted management's timelines for clinical readouts and pipeline progress [8] Aytu BioPharma Inc. (AYTU) - Stock rose 7.63% to $2.68 in after-hours trading after closing at $2.49, up 2.05% [8] - The price action follows the announcement of full-year and Q4 fiscal 2025 results expected on September 23, 2025, which will clarify commercial performance and progress with EXXUA [9] - Aytu maintains a portfolio of pediatric and ADHD-focused therapeutics and has extended its loan agreement with Eclipse to boost liquidity [10] Equillium Inc. (EQ) - Shares increased 10.34% to $1.60 in after-hours trading after closing at $1.45, down 0.68% [10] - The company announced up to $50 million in financing to advance EQ504 into clinical development, with positive feedback from the FDA regarding its regulatory pathway [11] - Its lead candidate, itolizumab (EQ001), is in Phase 3 trials for acute graft-versus-host disease and has completed earlier-stage studies in lupus nephritis and ulcerative colitis [11]