$MARA just borrowed $950 million at zero percent interest.

The company closed its private offering of 0.00% convertible senior notes due 2032 on July 25, 2025, with Morgan Stanley as the lead purchaser under a purchase agreement dated July 23. The 8-K landed on July 28. The headline number is large for a Bitcoin miner, and the structure is deliberate: no coupon, seven-year maturity, and proceeds pointed directly at Bitcoin accumulation.

The Capital Structure of the Trade

Net proceeds came to approximately $940.5 million after initial purchaser discounts and commissions, before offering expenses. $MARA immediately deployed a portion: $18.3 million retired approximately $19.4 million in aggregate principal of its existing 1.00% convertible senior notes due 2026, and $36.9 million covered the cost of capped call transactions entered into with certain initial purchasers and other financial institutions. The capped calls are designed to reduce potential dilution upon conversion and offset any cash payments above principal on converted notes, subject to a cap price.

What remains after those two uses is the bulk of the proceeds. The filing states $MARA expects to use the remainder to acquire additional Bitcoin and for general corporate purposes, which may include working capital, strategic acquisitions, expansion of existing assets, and repayment of additional debt. The Bitcoin acquisition language is explicit in the filing, not inferred from boilerplate.

The Overallotment Option Extends the Range

The initial purchasers received a 13-day option to buy up to an additional $200 million in aggregate principal at the same terms. If exercised in full, total gross proceeds reach $1.15 billion. Whether that option gets exercised depends on demand from the private placement buyers, and the filing does not indicate the outcome. That is the next concrete data point to watch from this transaction.

Conversion Terms and Dilution Math

The notes convert at an initial rate of 49.3619 shares per $1,000 principal amount, equivalent to a conversion price of approximately $20.26 per share. Prior to May 1, 2032, conversion is conditional on certain triggering events. On or after May 1, 2032, holders may convert at any time. $MARA can settle conversions in cash, stock, or a combination at its election.

$MARA's stock has gained roughly 65% over the trailing 90 days as of late May 2026, per cached price context. The conversion price of $20.26 sits above the recent trading range observed in that same price context, which means the notes are currently out of the money on conversion. The capped call overlay is meant to push the effective dilution threshold even higher, though the cap price is not disclosed in the 8-K text.

The company cannot redeem the notes before January 15, 2030. After that date, redemption requires the stock to have traded at or above 130% of the conversion price for at least 20 trading days in any 30 consecutive trading day window. Holders have a put right on January 4, 2030 at par if the stock is below the conversion price on the second trading day before that date.

Where This Fits in MARA's Financing Pattern

$MARA's Filing Risk Score sits at 100, reflecting the density and severity of capital markets disclosures the company generates. This offering is the kind of event that drives that signal: a nine-figure unregistered debt placement with multiple embedded derivatives, a partial retirement of existing notes, and explicit Bitcoin acquisition intent, all in a single 8-K. The elevated disclosure cadence is not a distress signal. It reflects a company that is actively using the capital markets to scale its Bitcoin position.

$MARA disclosed aggregate fair market value of approximately $2.41 billion for its Bitcoin holdings as of March 31, 2026, per the May 10, 2026 10-Q. A $950 million raise aimed at Bitcoin acquisition is material relative to that disclosed position size, assuming Bitcoin prices remain in the range observed at the time of that snapshot.

The BTC Exposure Score for $MARA sits at 80, reflecting the degree to which the equity tracks Bitcoin through both mining operations and treasury accumulation. This offering deepens that exposure. $MARA is not hedging its Bitcoin position with this capital raise. It is adding to it with borrowed money at zero coupon, betting that Bitcoin appreciation over seven years covers the dilution cost embedded in the conversion terms.

The Remaining Question

The overallotment option is the unresolved piece. If the initial purchasers exercise the full $200 million option, $MARA's total raise from this transaction reaches $1.15 billion, and the Bitcoin acquisition capacity expands proportionally. The next filing to watch is any 8-K or amendment disclosing whether that option was exercised, and any subsequent Form 4 or 8-K showing Bitcoin purchases funded by these proceeds.

Research only. Not investment advice.