Strategy Inc filed an 8-K on May 18, 2026, disclosing it sold $2.03 billion in securities through its at-the-market offering program between May 11 and May 17 and used the proceeds to buy 24,869 bitcoin at an average of $80,985 per coin. The purchase brings Strategy's total treasury to 843,738 BTC, acquired for a cumulative $63.87 billion at a blended average cost of $75,700 per coin. With bitcoin trading near $77,500 at the time of the filing, that treasury sits roughly 2.2% below its average cost basis — underwater by approximately $2.6 billion on a mark-to-cost basis, though unrealized and tied entirely to the trajectory of BTC's spot price.
The funding mechanism is the story. Of the $2,032.7 million in total net proceeds, $1,949.0 million came from the sale of 19,519,801 shares of STRC — Strategy's Variable Rate Series A Perpetual Stretch Preferred Stock — through its ATM. The remaining $83.7 million came from 430,344 shares of Class A common stock. STRC holders receive a monthly variable-rate dividend (currently 11.50% annualized, or $0.96 per share per month) and are entitled to a liquidation preference at $100 per share plus any accrued and unpaid dividends. They have no conversion right into bitcoin or common stock; what they hold is a claim on Strategy's cash flows and, ultimately, on the value of the bitcoin hoard securing those flows.
The loop is self-reinforcing so long as capital markets remain open to it: Strategy issues STRC at face value, collects near-face-value proceeds net of a thin sales commission, wires the cash to buy bitcoin, and the growth of the bitcoin treasury is the argument for why the next round of STRC will find buyers. STRC's notional capacity remaining as of May 17 was $17.5 billion; MSTR common stock had $26.3 billion remaining. Combined with the other preferred series (STRF, STRK, STRD), total remaining ATM authorization across all instruments exceeded $51 billion against a bitcoin treasury that Strategy's own filings carry at $63.87 billion in cost.
What stops it is the same thing that always stops a leveraged credit structure: a sufficiently large, sufficiently sustained price decline that makes the collateral appear inadequate to preferred-dividend coverage. Strategy's Q1 2026 10-Q balance sheet shows $8.17 billion in long-term debt alongside $10.0 billion in aggregate liquidation preference across all preferred series outstanding as of March 31. Cash was $2.21 billion. The digital-assets line — essentially the entire bitcoin stack — was $51.6 billion at Q1 end. At current prices, that gap between obligations and collateral is wide. The math changes if BTC falls another 30–40%; at a spot price in the $45,000–$50,000 range, the preferred liquidation claims would become a meaningful fraction of the treasury's market value.
On the earnings call on May 5, executive chairman Michael Saylor signaled a conceptual shift: "We will probably sell some bitcoin to pay a dividend just to inoculate the market and send the message that we did it." That framing — a tactical, signaling sale rather than a distress sale — is notable because it breaks explicitly from the "never sell" posture that defined Strategy's accumulation thesis. It is not a written covenant or a board-level policy commitment; it is an oral statement on a public call. But it is the first time Saylor has publicly acknowledged that BTC sales are a tool available to cover preferred obligations.
The concentration question is structural. Bitcoin's circulating supply is approximately 19.87 million coins. Strategy's 843,738 BTC represents roughly 4.25% of all circulating bitcoin. When a single corporate entity controls that share of supply, its ATM activity — buying $2 billion of spot BTC in a single week — is itself a material market input. It also sets a ceiling of sorts on the copycat thesis: recent filings and research tracking non-Strategy corporate bitcoin buyers show those purchases now represent roughly 2% of total identified institutional BTC demand, down from higher shares when the strategy was newer and the supply of large discretionary buyers thinner. Strategy's dominance of the corporate treasury space is essentially total; the followers are footnotes.
The risk is not complicated. Strategy has exchanged the risk of running a mid-size software company for concentrated exposure to a single asset with no yield, held on a balance sheet partially funded by preferred equity that does pay a yield. The preferred dividend obligations (annualized at roughly $1.1–1.2 billion across all outstanding preferred series at current rates) must be met in cash. The cash can come from ATM raises, from software revenues ($124 million per quarter, mostly recurring), or — now openly acknowledged — from BTC sales. So long as bitcoin trades above the waterline needed to support new ATM issuance, the machine runs. The filing that ends the loop will look different from this one.
Sources: Form 8-K filed by Strategy Inc with the SEC on May 18, 2026 (period May 11–17, 2026); Strategy Inc Q1 2026 Form 10-Q filed with the SEC (accession 0001050446-26-000031); Strategy Q1 2026 earnings call transcript, May 5, 2026 (Saylor oral statement on potential BTC sales); Strategy press releases and 8-K filings (July 29, 2025 STRC IPO 8-K confirming instrument name); Bitcoin circulating supply from on-chain data.