Core Viewpoint - Biotech stocks are experiencing renewed momentum, with small-cap companies like Nautilus Biotechnology, PepGen, Lixte, RenovoRx, Genelux, and VolitionRx attracting investor interest through various catalysts such as insider buying, strategic partnerships, and clinical trial progress Group 1: Nautilus Biotechnology (NAUT) - Nautilus Biotechnology's stock surged 5.52% during regular trading, closing at $0.7070, and rose an additional 7.5% in after-hours trading to $0.76, with trading volume nearly double its average at 647,399 shares [2] - Recent insider buying by CEO Sujal M. Patel, who purchased 83,500 shares on September 8 and 116,500 shares on September 5, totaling over $135,000, indicates strong leadership confidence [3] - The company reported a narrower loss of $0.12 per share in Q2 2025, with an 18% drop in operating expenses, and has $179.5 million in cash, providing a financial runway through 2027 [4] Group 2: PepGen Inc. (PEPG) - PepGen's stock rebounded 7.14% in after-hours trading to $1.50 after a regular session close of $1.40, with trading volume more than double its average at 638,576 shares [4] - The company completed dosing for its 15 mg/kg arm of the FREEDOM trial, with topline data expected in early Q4 2025, following a strategic narrowing of its pipeline [5] Group 3: Lixte Biotechnology Holdings Inc. (LIXT) - Lixte's stock rose 5.85% in after-hours trading to $5.25 after closing at $4.96, with a trading volume of 503,604 shares, notable given recent volatility [5] - The company announced a $2.6 million purchase of Bitcoin and Ethereum to diversify its treasury holdings, reflecting a strategic shift in financial strategy [6] Group 4: RenovoRx Inc. (RNXT) - RenovoRx shares increased 4.22% in after-hours trading to $1.2194 after a regular session close of $1.17, with trading volume significantly above its average at 886,119 shares [6] - The company received a positive recommendation to continue its Phase III TIGeR-PaC trial for pancreatic cancer, reinforcing confidence in its lead therapy platform [7] Group 5: Genelux Corp. (GNLX) - Genelux's stock rose 4.11% in after-hours trading to $3.80 after closing at $3.65, with trading volume relatively light at 60,339 shares [8] - The recent activity follows Genelux's participation in the H.C. Wainwright Global Investment Conference [9] Group 6: VolitionRx Ltd. (VNRX) - VolitionRx's stock increased 4.27% in after-hours trading to $0.6474 after closing at $0.6209, with trading volume slightly below its average at 183,777 shares [10] - The company announced a Research License and Exclusive Commercial Option Rights Agreement with Werfen's Immunoassay Technology Center, focusing on advancing its Nu.Q NETs assay for Antiphospholipid Syndrome [10]