Sellas Life Sciences (SLS) Stock Skyrockets: BlackRock’s 5% Bet and Breakthrough Cancer Data Ignite Rally
Sellas Life Sciences (NASDAQ: SLS) stock has surged roughly 100% year-to-date, closing around $2.14 on Oct. 17, 2025 ts2.tech ts2.tech (versus a 52-week low of $0.77). In after-hours trading on Oct. 17 it spiked another +38%, briefly touching a new 52-week high ts2.tech. Big investors are piling in: BlackRock disclosed a 5.4% stake (~5.7M shares) in SLS on Oct. 18 ts2.tech, and other funds like Vanguard and Marshall Wace added millions of shares in Q2 quiverquant.com. On the drug-development front, Sellas’s lead AML immunotherapy (galinpepimut‑S, “GPS”) is in a Phase 3 AML trial (REGAL), which recently passed an interim safety review
