Update: Boost Run to Join Russell 2000, Russell 3000 Indexes; Shares Rise

03:02 PM EDT, 09/17/2026 (MT Newswires) -- (Updates with recent stock movement in the headline and the first paragraph.) Boost Run (BRUN) shares were up nearly 10% in afternoon trading on Thursday after the company said it will join the Russell 2000 and Russell 3000 indexes as part of FTSE Russell's quarterly initial public offering additions. The inclusion is set to take place after the market closes on Friday, subject to FTSE Russell's final review and reconstitution, Boost Run said. Additionally, the reconstituted Russell 2000 and Russell 3000 indexes are expected to begin trading as the market opens on Monday, according to the company. Price: 16.62, Change: +1.46, Percent Change: +9.60