Mubadala Disclosed a $436.9 Million Stake in BlackRock’s Bitcoin ETF

Mubadala Investment Co. PJSC disclosed a $436.9 million position in BlackRock’s iShares Bitcoin Trust ETF in a Form 13F accepted by the U.S. Securities and Exchange Commission on February 14, 2025. The filing gave the market a dated, regulator-hosted record that an Abu Dhabi sovereign investor had added a large U.S.-listed bitcoin vehicle to its reportable securities portfolio.

The disclosure covered holdings as of December 31, 2024, not the filing-day portfolio. It listed 8,235,533 IBIT shares with a market value of $436,895,026 and identified Mubadala as having sole investment discretion and sole voting authority over the position. The record established exposure through fund shares; it did not show Mubadala holding bitcoin directly.

What the filing establishes

The SEC accepted the filing at 11:47:41 Eastern time on February 14. Mubadala reported 55 information-table entries valued at $20,448,574,247 in total. Coinburn calculates that IBIT represented about 2.14% of that disclosed Form 13F value: $436,895,026 divided by $20,448,574,247. That percentage applies only to the securities in this filing and must not be treated as the allocation across Mubadala’s entire global portfolio.

Dividing the reported market value by the reported share count produces an implied December 31 value of approximately $53.05 per IBIT share. This is a calculation from the quarter-end 13F snapshot, not a February 14 trading price, purchase price or estimate of Mubadala’s cost basis.

The filing also does not reveal when the shares were acquired, how many separate transactions were involved or whether the position remained unchanged after December 31. Form 13F is a quarterly holdings report rather than a transaction ledger. The wording “disclosed a position” is therefore supported; the stronger claim that Mubadala bought all 8.2 million shares during a particular period is not established by this filing alone.

Why the route into bitcoin mattered

IBIT offered exposure through a security traded on Nasdaq instead of requiring the investor shown in the 13F to disclose direct wallet custody. BlackRock’s pre-existing regulatory report described the trust as a Delaware statutory trust whose net asset value depends on a bitcoin-dollar benchmark. Mubadala’s position consequently connected sovereign investment capital to bitcoin through familiar U.S. securities-market reporting, custody and fund administration.

That distinction mattered institutionally. The event was not a government announcement that bitcoin had become a reserve asset, and it was not evidence that Abu Dhabi had changed monetary policy. It was a portfolio disclosure by a government-owned investment manager. Even so, the size of the position showed that regulated spot-bitcoin products could accommodate a nine-figure allocation from a sovereign institution within their first year of U.S. trading.

Contemporaneous coverage on February 14 treated the filing as evidence of growing institutional adoption. That interpretation was reasonable but limited. One disclosed holder could not establish a broad sovereign buying trend, and the form did not identify the investment thesis, expected holding period or risk limits.

A delayed but consequential snapshot

The timing is essential. Markets learned about the position on February 14, while every valuation in the information table referred to December 31. The 45-day reporting lag means the disclosure added transparency without providing a live view of flows or ownership.

The verified conclusion is narrower than the headlines it generated: as of December 31, 2024, Mubadala reported 8,235,533 shares of IBIT worth $436,895,026, and that fact became public through EDGAR on February 14, 2025. The filing supported a significant institutional-adoption story. It did not establish direct sovereign bitcoin custody, a purchase date, a cost basis or a continuing position after the reporting cutoff.