Janus Henderson Group Reports 6.9% Stake in Assembly Biosciences, Inc.

Janus Henderson Group Ltd. filed a Schedule 13G/A on August 13, 2026, reporting a 6.9% ownership stake in Assembly Biosciences, Inc. (ASMB). The filing indicates that Janus Henderson beneficially owns 1,359,514 shares of common stock as of the event date of June 30, 2026. This position represents an increase from the previously reported 0.0% ownership, reflecting a new significant holding by the investment manager. Janus Henderson acts as the parent holding company for several SEC-registered investment advisers, including Janus Henderson Investors US LLC and Janus Henderson Investors UK Limited, which exercise voting and dispositive power over the shares on behalf of managed portfolios. Notably, the Janus Henderson Biotech Innovation Master Fund Ltd. holds the right to receive dividends and sale proceeds for more than 5% of the issuer's common stock. The filing confirms that these securities were acquired in the ordinary course of business and not for the purpose of influencing or changing the control of the issuer.