Welcome to our dedicated page for Grayscale Bitcoin Mini Trust ETF SEC filings (Ticker: BTC), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Grayscale Bitcoin Mini Trust ETF filings document the Trust’s Bitcoin exchange-traded product structure, including its sponsor relationship, share creation and redemption process, NAV methodology, and custody framework for Bitcoin holdings. Material-event reports describe updates to valuation benchmarks, Authorized Participant agreements, in-kind transaction mechanics, and arrangements with prime broker, custodian, transfer agent, administration, and accounting service providers.
The filings also cover sponsor governance and control matters, risk-related disclosures for digital asset trading platforms, AML and KYC considerations connected to benchmark constituents, and communications policies involving third-party content on social media. These regulatory records frame the Trust as a Bitcoin-holding vehicle administered by Grayscale Investments Sponsors, LLC rather than an operating business with products or services of its own.
Grayscale Bitcoin Mini Trust ETF reported that its sponsor, Grayscale Investments Sponsors, LLC, entered into a new Coinbase Prime Broker Agreement on October 3, 2025. This agreement governs custodial and prime brokerage services for the Trust’s bitcoin, provided by Coinbase, Inc., Coinbase Custody Trust Company, LLC, and Coinbase Credit, Inc.
The Trust also implemented a new Fund Administration and Accounting Agreement with BNY Mellon Asset Servicing, effective October 9, 2025, under which BNY continues to deliver administrative and accounting services. In connection with these changes, earlier prime broker and fund administration agreements dated in 2024 were terminated and replaced by the new contracts.
Grayscale Bitcoin Mini Trust ETF entered into a Second Amendment to its Master Custody Service Agreement with Anchorage Digital Bank N.A., adding the Trust as a party to that agreement. Under this Anchorage Digital Custodian Agreement, Anchorage Digital will provide custody and safekeeping services for a portion of the Trust’s Bitcoin holdings.
Coinbase Trust Company, LLC remains the Trust’s primary custodian, and the Sponsor will decide, in its sole discretion, how much Bitcoin is held at each custodian. Anchorage Digital must keep all private keys for the Trust’s Bitcoin held with it in offline cold storage, which is designed to reduce hacking risk compared with online hot storage.
The agreement addresses how Anchorage Digital may respond to forks of the Bitcoin blockchain, including temporary suspensions and decisions on which branch to support. It also includes indemnification obligations by the Trust in certain circumstances and requires Anchorage Digital to maintain insurance coverage. Related custody agreements are filed as exhibits.