Altimar Acquisition Corp. II Altimar Acquisition Corp. II (NYSE: ATMR) operates as a blank check company, or special purpose acquisition company (SPAC), with no significant ongoing business operations other than seeking and completing an initial business combination, such as a merger, share exchange, asset acquisition, share purchase, reorganization, or similar transaction with one or more businesses or entities; it targets companies demonstrating strong organic growth potential and cash-generative business models at maturity, primarily in North America though without restriction to specific industries or geographies. Founded in 2020 and headquartered in New York, New York, the company completed an initial public offering in February 2021 raising $300 million through 30 million units at $10 each, listing on the New York Stock Exchange under the ATMR ticker. In December 2021, Altimar Acquisition Corp. II completed a definitive business combination through a reverse merger with Fathom Digital Manufacturing Corporation (formerly Kemeera, Inc.), an on-demand digital manufacturing services provider majority-owned by CORE Industrial Partners; the transaction, valued at a pro forma enterprise value of $1.5 billion, was funded by cash in trust and an $80 million PIPE investment from top-tier institutional investors, after which the combined entity began trading under the FDMG ticker as Fathom Digital Manufacturing Corporation, with Altimar's public shareholders receiving approximately 25% ownership and Fathom's management, led by CEO Ryan Martin, continuing in place. As of late 2025, the ATMR ticker reflects ongoing trading activity with a market capitalization around $454 million and recent share prices near $10.53, indicating the legacy SPAC structure persists post-merger redemption or delisting adjustments for the operating entity.