Amtech Systems, Inc. ("Amtech") (NASDAQ: ASYS), a manufacturer of equipment and consumables enabling AI semiconductor device packaging and advanced substrate fabrication, today announced that it is set to join the broad-market Russell 3000 Index and the small-cap Russell 2000 Index at the conclusion of the Russell US Indexes annual reconstitution, effective after the US equity markets open on June 29, 2026, according to a preliminary list of additions posted by FTSE Russell on May 22, 2026 as part of the first 2026 Russell indexes reconstitution.