Options trading in Sellas Life Sciences Group Inc. climbed to a total of 66,504 contracts by 2:10 p.m. New York time on Friday, with call contracts accounting for 50,150 and put contracts for 16,354. The most actively traded option was the June 26 2026 $12 call, which saw 3,815 contracts change hands and carried an open interest of 1,548 contracts. A spread involving the September 18 2026 $15 and $20 calls accounted for 3,134 contracts, split evenly with 1,567 contracts at each strike; the $15 call held an open interest of 16,662 contracts while the $20 call showed zero open interest. The January 15 2027 $10 call traded 2,498 contracts against an open interest of 23,441 contracts, and the October 16 2026 $2 put recorded 2,277 contracts traded with an open interest of 973 contracts. The June 26 2026 $13 call registered 1,580 contracts traded and an open interest of 986 contracts. During the same session the company’s shares advanced 14.2% to $12.03. The three‑month implied volatility rose by 24.56 percentage points to 250.53%, and the three‑month 90/110 skew increased by 18.58 percentage points to 23.08 percentage points.