SpringWorks Therapeutics, Inc. (NASDAQ: SWTX) filed seven Post-Effective Amendments on Form S-8 to deregister all unsold shares previously registered for issuance under its 2019 employee equity plans. The action follows the closing of its merger with Merck KGaA, Darmstadt, Germany on 1 July 2025, under which SpringWorks became a wholly owned subsidiary of Merck through EMD Holdings Merger Sub, Inc. The amendments cover the following historical S-8 registrations: Because the company is now private, SpringWorks has terminated all offerings under these plans. Consistent with undertakings in each registration statement, any securities that remained unsold as of the merger date are withdrawn from registration. The filing is signed on behalf of the company by Secretary Michael MacDougall and relies on Rule 478 of the Securities Act to omit additional signatures.