Strong 2025 short performance, consistent long-term hit rate
Report by Bios Research
Bios Research has published 7 short ideas this year, with 5 generating absolute returns. This builds on a strong trailing 12-month run with 13 of 18 short calls delivering positive returns. Positions closed in recent months include Bio-Techne (-22%) and Butterfly Network (-43%), Repligen (-26%) and Twist Bioscience (-25%). Since inception in 2012, Bios has published 183 short ideas with a 69% hit rate and 42% producing >25% returns. Focus areas include medtech, commercial biotech, services/tools and potential frauds. Bios currently has 13 active short positions and will soon launch a new $10bn+ biotech short which Aaron Fletcher believes has up to 80% downside before the end of 2025.