Rocket Companies is a Detroit-based fintech platform built around mortgage origination and servicing, with an expanding presence in real estate search, title and closing, and personal finance. The core business is Rocket Mortgage, the largest mortgage originator and servicer in the U.S., which helps consumers obtain and refinance home loans through a digital-first process. Rocket sells directly to consumers via its website and app, and through third-party channels including independent mortgage brokers, financial institution partners, and correspondent lenders. Rocket earns revenue primarily through gain-on-sale margins when it originates and sells loans into the secondary market, and through recurring servicing fees on its portfolio. The servicing business generates roughly $5B in annual cash flow and acts as a captive pipeline for new originations: when clients refinance or buy a new home, Rocket aims to recapture that loan at near-zero acquisition cost. Rocket acquired Redfin, a digital real estate brokerage with ~50M monthly users, and Mr. Cooper, formerly the largest independent mortgage servicer, in 2025. These deals expanded Rocket's servicing portfolio to $2.1T in unpaid principal balance and added a home search and brokerage capability, moving Rocket toward a vertically integrated platform spanning home search, financing, closing, and servicing. Rocket also operates Rocket Money, a personal finance app, and Rocket Loans, a personal lending platform. Rocket argues that AI-driven automation enables it to grow origination volume without proportional headcount increases, and that its vertical integration and proprietary technology platform are difficult for competitors to replicate at scale.