Sionna Stock Is Up 144% This Past Year. Is the Biotech a Buy as One Fund Makes a $7 Million Bet?

Superstring Capital Management initiated a new position in Sionna Therapeutics (NASDAQ:SION), acquiring 180,593 shares in the fourth quarter. What happened According to a February 17, 2026, SEC filing, Superstring Capital Management reported a new stake in Sionna Therapeutics totaling 180,593 shares. The quarter-end value of the position stood at $7.43 million. What else to know This new position represents 3.98% of Superstring’s 13F reportable AUM as of December 31, 2025. Top holdings after the fil ...