Coinbase quietly guards a digital war chest of 2.7 million bitcoin, with Wall Street giants, tech titans, and mining firms all locking their crypto fortunes behind its walls.

Digital Fort Knox

Onchain data from timechainindex.com shows that San Francisco–based Coinbase (Nasdaq: COIN) currently safeguards 13.7% of the bitcoin ( BTC) in circulation. Beyond running a trading venue, the firm stewards sizeable balances for an array of counterparties, ranging from peer exchanges and miners to issuers of exchange‑traded products (ETPs).

Coinbase’s trove of customer assets totals 1,045,246 BTC, and the platform likewise custodies reserves for Revolut (28,536  BTC), Bitvavo  (22,695  BTC), and Newton  (1,480  BTC). The breadth of Coinbase’s institutional clientele sketches a vivid portrait of modern crypto finance.

Anchoring this ever‑growing vault is Blackrock, whose Ishares Bitcoin Trust (IBIT) swiftly accumulated 607,086  BTC, earning the distinction of the largest ETF position under Coinbase’s watch. Trailing close behind, Grayscale’s GBTC stores 189,416  BTC, while ETF newcomers such as Ark  Invest with  21shares and Bitwise collectively lift the ETF/ETP segment to well over 1  million   BTC.

cache—still eclipsing that of nearly every public company—and oversees balances for tech names such as Tesla and SpaceX, holding 11,509 and 8,285   BTC apiece. Together, Coinbase’s Prime Custody and over‑the‑counter (OTC) desks complete a client roster that spans crypto‑native funds and traditional finance (TradFi) institutions alike.

Whereas most heavyweight ETF sponsors—Blackrock, Ark  Invest, Bitwise, Franklin  Templeton, and even Grayscale—house their ETFs’ bitcoin with Coinbase, Fidelity’s FBTC fund prefers its own rails, employing its Fidelity Digital Assets custody stack. All told, Coinbase oversees 2,719,568   BTC under management—roughly  $261  billion at prevailing spot prices.