Strategy filed an 8-K on December 29, 2025, disclosing another weekly Bitcoin purchase. The company acquired 1,229 BTC between December 22 and December 28, spending approximately $108.8 million at an average price of $88,568 per coin. The purchases were funded through proceeds from ATM share sales under the $MSTR equity program.

The filing brings aggregate holdings to 672,497 BTC as of December 28, 2025. The cumulative average purchase price across the entire position now stands at $74,997 per BTC, with total aggregate cost of approximately $50.44 billion.

The ATM Engine Keeps Running

This purchase fits the cadence Strategy has maintained throughout its accumulation program. The company has used its ATM facility as the primary funding mechanism for incremental Bitcoin acquisitions, converting equity issuance directly into BTC on a near-weekly basis. The December 28 purchase is small relative to the total position, but the mechanism is the same one that built 672,497 BTC over time.

The ATM structure matters because it ties Bitcoin acquisition pace directly to equity market conditions. When $MSTR shares trade at a premium to net asset value, the ATM is accretive to per-share BTC exposure. When that premium compresses, the economics of issuing new shares to buy Bitcoin shift. The filing does not disclose the specific share price or volume at which the ATM was tapped for this tranche, but the net proceeds figure of $108.8 million reflects commissions already deducted.

Position Scale in Context

Strategy disclosed aggregate fair market value of approximately $64.04 billion as of April 26, 2026, per the May 6 10-Q. That figure, tied to a $78,258 per BTC reference price on that snapshot date, illustrates how the cumulative cost basis of roughly $50.44 billion compares to the fair value of the position at a later point in time. The December 28 purchase at $88,568 average was above that later fair-value reference price per coin, a reminder that the per-BTC cost of individual tranches varies meaningfully across the accumulation timeline.

$MSTR's BTC Exposure Score sits at 85, reflecting that Bitcoin is central to the equity's research case rather than a peripheral balance-sheet item. At 672,497 BTC, the position is large enough that weekly purchase disclosures like this one function less as standalone events and more as confirmation that the accumulation program remains active.

Filing Risk and Disclosure Cadence

$MSTR's Filing Risk Score is at the ceiling, driven by the density of capital markets and Bitcoin-update filings the company generates. This 8-K is one data point in that cadence. The elevated disclosure intensity reflects the company's operating model: frequent ATM activity and weekly Bitcoin updates produce a filing rhythm that is unusual relative to most public companies, even within the Bitcoin treasury holder category.

The stock's price context adds some texture. $MSTR is up roughly 28% over the trailing 90 days as of May 20, 2026, but down about 60% over the trailing year from the same reference point. The short-term trend is upward while the long-term trend remains down, a split that reflects the distance between the mid-2025 highs and current levels. The December 29 filing itself predates that price context by several months and does not speak to current equity valuation.

What the Next Filing Will Confirm

The next weekly 8-K will show whether Strategy continued purchasing through the final days of December 2025 and at what average price. The more consequential disclosure will be the Q4 2025 10-K, which will show total BTC acquired during the quarter, the financing mix between ATM equity and any convertible activity, and updated risk factor language. The Q4 filing will also be the first annual report to reflect fair-value accounting for the full fiscal year, making the income statement presentation materially different from prior years.

Research only. Not investment advice.