Bitcoin self-custody / multisig company
Casa is the Bitcoin self-custody and multisig company founded in 2017 by Jeremy Welch and Nick Neuman. The company's flagship product is a 2-of-3 (and later 3-of-5) multisig wallet with a hardware-key-distribution model and key-recovery service. It is closely associated with Jameson Lopp, who joined Casa as CTO in 2018.
Casa is one of the recurring reference points in Bitcoin Group discussions of self-custody and hardware-wallet best practice; the company also publishes the annual "Casa State of Self-Custody" report. See casa.io.