Willow Blossom Holdco Limited

Willow Blossom Holdco Limited is a private limited company incorporated in England & Wales on 11 March 2025 (company no. 16306329), registered at 9th Floor, 107 Cheapside, London EC2V 6DN. Its sole director is Sarah Elizabeth O'Leary, also CEO of Willow Innovations, Inc. of Mountain View, California. It is a subsidiary of Willow Innovations, the VC-backed femtech company founded in 2014 (raised roughly $256M; last reported valuation ~$256M in 2021; private). Willow Blossom was formed as the acquisition vehicle for the assets of Bristol-based Chiaro Technology Ltd (trading as Elvie), which entered pre-packaged administration on 28 March 2025; the sale transferred substantially all of Elvie's business and assets — including 178 employees and its patent portfolio — to Willow Blossom.

Operations. Willow Blossom is a holding/asset-owning entity rather than an independent operating business. The underlying operations are the combined Willow + Elvie femtech portfolio: wearable, in-bra breast pumps (Willow 360, Willow Go; Elvie pumps), milk storage containers, Elvie's pelvic-floor trainer and Rise smart bouncer/bassinet, and associated apps. Willow Innovations acquired Elvie following 2023 patent litigation it brought against Chiaro over breast-pump technology; the asserted patents now reside with (or are co-held by) Willow Blossom.

Litigation posture. The structured data shows one tracked case, with Willow Blossom as defendant and zero as plaintiff — i.e., it is a patent owner whose acquired portfolio is being challenged, not an NPE. The single tracked matter is Shenzhen Root Technology Co., Ltd. v. Willow Blossom Holdco Limited, IPR2025-00554 (PTAB, filed 6 March 2025) concerning U.S. Patent 11,806,454 ("Wearable Breast Pump System"); institution was granted 14 October 2025, with a parallel IPR2025-00560 on the '381 patent and a related, stayed district-court action. Willow Blossom and Willow Innovations also appeared as patent owner in IPR2024-01296 (the '380 patent), where the Board found challenged claims unpatentable on 18 February 2026. Willow Blossom is additionally a co-complainant with Willow Innovations in ITC Section 337 investigation 337-TA-1522 (instituted 22 September 2026) against several Chinese and U.S. breast-pump importers.