AtaiBeckley to Join Russell Indexes, Expanding Visibility Across U.S. Equity Markets

Key Facts

In a move that strengthens the presence of small-cap biotech in U.S. markets, AtaiBeckley (NASDAQ: ATAI) announced it will be added to the Russell 2000 and Russell 3000 indexes effective June 29, 2026. The inclusion follows the stock's recent addition to S&P indexes in March, signalling a rapid increase in institutional visibility.

ATAI closed at $4.17 on June 24, 2026, up from its session low of $4.08. Index inclusion typically attracts passive fund inflows—the Russell indexes collectively track approximately $12.2 trillion in assets—which could support demand for the stock in the days following the effective date.

With the official addition set for June 29, ATAI may see further momentum as index funds adjust their portfolios. As of the June 24 close, the stock traded at $4.17, with a daily range of $4.08 to $4.29. No major near-term catalysts are on the economic calendar, but the index inclusion remains the key event for traders to watch.