Merge Labs signed a multi-year licensing agreement with Butterfly Network to build ultrasound-based brain-computer interfaces. The deal gives Merge access to Butterfly's Poseidon ultrasound-on-chip technology, with Butterfly serving as its exclusive chip partner in exchange for upfront payments, hardware commitments, and future royalties. Butterfly has similar agreements with Midjourney and Forest Neurotech (which shares a CEO with Merge). Merge, co-founded by Sam Altman and launched in January with $252M, is pursuing a non-invasive interface that reads and modulates brain activity with ultrasound.