MSTR mechanics · 7 min read

How MSTR's convertible debt affects mNAV

Convertible notes are the engine behind a big chunk of Strategy's Bitcoin stack. They're also the part of mNAV people most often get wrong. Here's how the debt works and exactly where it shows up in the math.

What a convertible note is

A convertible bond is debt that the lender can swap for stock at a fixed price. Strategy has issued billions in convertibles, typically at very low or zero coupons, with conversion prices set well above the share price at issuance. Investors accept the tiny coupon because they're really buying a call option on MSTR's upside; Strategy gets cheap money to buy Bitcoin.

Two ways it hits mNAV

Recall the full, enterprise-value version of mNAV:

mNAV (full) = (market cap + preferreds + convertible debt − cash) ÷ BTC NAV

Before conversion — debt in the numerator. Outstanding convertibles count as a claim ahead of common stock, so they raise enterprise value and therefore the full mNAV. The simple, equity-only mNAV ignores them, which is why it always reads lower than the full version.
After conversion — dilution in the denominator of per-share metrics. If MSTR rises above the conversion price and notes convert, debt disappears but new shares are created. More shares means each one is backed by slightly less Bitcoin — unless the capital raised bought enough BTC to offset it.

Why it can still be accretive

The trick is the conversion premium. If Strategy borrows at a conversion price far above where it issued shares, then converts only after the stock has climbed, it effectively sold equity at high prices and bought Bitcoin along the way. Done repeatedly while MSTR trades above NAV, that raises Bitcoin per share even though share count grows. The leverage is what gives MSTR its BTC torque.

Where the risk lives

Maturities. If a note reaches maturity out-of-the-money (MSTR below the conversion price), it's repaid as debt — a cash obligation, not a free conversion. That's when leverage cuts the other way.
Forced selling risk. The bear case is that a stack of maturing converts plus preferred dividends forces Strategy to raise capital at a bad time. In practice the convertibles have been long-dated and laddered to reduce this.
Premium dependence. The whole machine relies on MSTR trading above NAV. Near an mNAV of 1.0, accretive issuance stalls.

The takeaway

Convertible debt is why MSTR is more than 1x Bitcoin and why the full mNAV sits above the simple one. It amplifies returns when the premium and Bitcoin cooperate, and becomes a fixed claim when they don't. Always check which mNAV a source quotes before comparing.