What Are Bitcoin Treasury Companies? Strategy, Metaplanet, and the mNAV Trade Explained

If you bought one MicroStrategy share in 2020, you owned a stake in a software company that happened to hold some Bitcoin. If you buy one Strategy share today, you own roughly 0.0036 BTC of corporate treasury — and you're paying a premium for the privilege of holding it inside a Nasdaq-listed wrapper.

That premium is the entire game.

A Bitcoin treasury company (BTC) is a publicly listed entity whose primary corporate purpose is to acquire and hold Bitcoin on its balance sheet, funded by issuing equity, debt, and preferred shares to capital markets. The model was pioneered by Michael Saylor's Strategy (formerly MicroStrategy) in August 2020. By April 26, 2026, Strategy held 818,334 BTC — roughly 3.9% of all Bitcoin that will ever exist — and a wave of imitators across Tokyo, London, and Hong Kong are now running the same playbook.

This guide breaks down how the model actually works: the financing stack, the mNAV multiple, the leading players, and the structural risks that show up the moment Bitcoin stops going up and to the right.

How a Bitcoin Treasury Company Actually Works

Strip away the orange-laser-eye marketing and a Bitcoin treasury company is doing one thing: arbitraging the cost of capital it can raise from public equity markets against the cost of buying Bitcoin spot.

The flywheel works in five steps:

1. Issue equity or debt — through ATM (at-the-market) share sales, convertible senior notes, or a new generation of perpetual preferred stock paying double-digit yields.
2. Use the proceeds to buy spot Bitcoin — typically through OTC desks like Cumberland or Galaxy, batched over weeks.
3. Announce the purchase publicly — usually a Monday-morning 8-K filing followed by a Saylor tweet.
4. Watch the share price reprice upward — because the market values BTC-per-share growth at a premium multiple to underlying net asset value.
5. Repeat at the new, higher share price — which lets you raise more capital per share of dilution, accumulating BTC faster than your share count grows.

Strategy formalized this loop into a metric it calls BTC Yield: the percentage change in BTC-per-diluted-share over a given period. Strategy reported 2.8% BTC Yield year-to-date as of Q1 2026. As long as BTC Yield is positive, dilution is accretive — every new share issued buys more Bitcoin than it dilutes existing holders' claim on.

This is fundamentally different from an ETF. Spot Bitcoin ETFs (BlackRock's IBIT, Fidelity's FBTC) are passive vehicles that hold ~1 satoshi per share by mandate. They don't issue debt, they don't run accumulation campaigns, and they trade at NAV by construction through creation/redemption arbitrage. A Bitcoin treasury company is the opposite: it deliberately runs leveraged, actively-managed BTC accumulation, and the market lets it trade at a multiple of underlying NAV.

That multiple has a name.

mNAV — The One Number That Decides Whether the Model Works

mNAV stands for modified Net Asset Value and it is the single most important metric in this entire category. It's defined as:

mNAV = Market Capitalization / (BTC Holdings × BTC Spot Price)

An mNAV of 1.0x means the market is valuing the company at exactly the dollar value of its Bitcoin (no premium, no discount). An mNAV of 2.0x means investors are paying $2 for every $1 of underlying BTC. An mNAV below 1.0x means the company trades at a discount to its own treasury.

The mNAV does the heavy lifting because it determines whether the issuance flywheel above actually creates value. Issuing equity at 2.0x mNAV and using the proceeds to buy spot BTC mechanically grows BTC-per-share. Issuing equity at 0.9x mNAV does the opposite — it shrinks BTC-per-share and destroys value for existing holders.

This is why Strategy and Metaplanet both publish daily mNAV dashboards, why Saylor's tweet cadence accelerates when the multiple expands, and why activist short reports always target the mNAV directly.

As of early May 2026:

Source: bitcointreasuries.net public-companies tracker, company filings.

Note what's happening at the bottom of the table: when mNAV compresses to ~1.0x or below, the financing flywheel jams. The company can no longer raise equity accretively, debt rollover gets harder, and the entire growth thesis depends on Bitcoin price appreciation alone — exactly when the market most doubts that price appreciation. We'll come back to this risk.

The Capital Stack — How They Actually Pay for the Bitcoin

The most underappreciated innovation in the BTC treasury category isn't the Bitcoin buying. It's the financing stack the operators have built to fund it.

Strategy's stack as of Q1 2026 includes four distinct instruments:

• Common stock (MSTR) — sold via ATM ("at-the-market") programs that drip equity into the open market whenever mNAV is favorable. Strategy raised $5.6 billion of STRC gross proceeds year-to-date according to its Q1 2026 financial results press release.
• Convertible senior notes — long-dated zero-coupon or low-coupon bonds that convert to equity at a strike well above the issuance-day share price. Convertibles let Strategy borrow at near-zero cash cost in exchange for selling upside optionality.
• STRC perpetual preferred stock — launched July 2025, pays an 11.5% dividend, sits senior to common but junior to debt. STRC was deliberately designed to attract income-focused institutional buyers (insurers, pension funds) who can't or won't hold spot BTC directly but will gladly own a high-yield preferred whose underlying collateral is BTC.
• STRK and STRF preferreds — variants on STRC with different seniority and call features, broadening the buyer base.

Metaplanet has built its own version of this stack adapted to Japanese capital markets: a ¥770.9 billion (~$5.4B) equity raise via moving-strike warrants — Asia's largest-ever equity raise dedicated to Bitcoin, issued at a premium to market because Metaplanet's high stock volatility and deep liquidity made the warrants commercially attractive. CEO Simon Gerovich announced the raise on X.

The pattern is clear: the more a treasury company can route around plain-vanilla equity issuance and into hybrid instruments — convertibles, preferreds, warrants — the more capital it can raise without triggering proportional dilution. The financing engineering matters as much as the BTC accumulation itself.

The Players — Who's Actually Doing This in 2026

The category has moved well beyond a single company. As of Q2 2026:

Strategy (MSTR) — The category creator and still the dominant operator. 818,334 BTC, ~$74K average cost, ~3.9% of Bitcoin's eventual 21M supply. CEO Michael Saylor signals every accumulation cycle through his "Orange Dots" chart on X.

Twenty One Capital (XXI) — A SPAC-merged BTC treasury company sitting at #2 with ~43,514 BTC. Backed by Tether, Bitfinex, and SoftBank, XXI was structured specifically to compete with Strategy on BTC-per-share accumulation rate.

Metaplanet (3350.T / MTPLF) — Japan's flagship BTC treasury company. Pivoted from a struggling hospitality business into Bitcoin accumulation under CEO Simon Gerovich. Held 40,177 BTC at end of Q1 2026, with stated targets of 100,000 BTC by end-2026 and 210,000 BTC by end-2027 (≈1% of total supply). Q1 2026 acquisitions detailed below:

MARA Holdings — A Bitcoin miner that retained its mined BTC rather than selling. Held ~38,689 BTC after selling a portion to manage debt — the mining-derived treasury model is meaningfully different from the pure issuance-funded model and tends to trade closer to 1.0x mNAV.

The long tail — Smaller treasury companies have proliferated across UK AIM-listed shells, Hong Kong micro-caps, and US OTC tickers. Most are sub-$200M in market cap, sub-1,000 BTC in holdings, and trade at wildly variable mNAVs. The category has also seen high-profile abandonments: K-Wave Media pulled its $485 million BTC treasury plan in May 2026 to pivot into AI infrastructure instead — a useful reminder that not every BTC treasury announcement survives contact with the cost of capital.

Why Anyone Pays a Premium for a BTC Treasury Stock

If you can buy spot Bitcoin for $74,000, why would you pay 1.37x that for the same Bitcoin held inside Metaplanet, or 0.93x – 1.23x for it inside Strategy?

There are five real answers, in descending order of how much actually moves money:

1. Regulatory/account access — Many institutional accounts (401(k)s, US IRAs, Japanese NISAs, mandate-restricted insurance accounts) can hold listed equities but cannot directly hold spot BTC or even spot ETFs. A Nasdaq- or TSE-listed treasury stock is the only way for that capital to get BTC exposure.
2. Embedded leverage without margin calls — A treasury company funded with convertibles and preferreds is implicitly levered to BTC. Holding the equity gives you roughly 1.5x – 2.5x BTC beta during expansion phases, with the leverage handled at the corporate level (no broker margin call when BTC drops).
3. BTC Yield — A growing BTC-per-share number means the equity is getting more Bitcoin-rich over time, even with no BTC price move. That's a genuine alpha source vs. a static spot holding.
4. Optionality on financing innovation — STRC's 11.5% preferred sold to insurers; ¥770.9B premium-priced warrants in Tokyo. The financing team is itself creating value the market pays for.
5. Saylor (and now Gerovich) as a brand — Concentrated thought leadership lowers customer-acquisition cost for new capital and creates a Schelling point for BTC-curious institutional money. This is real, and it's also the most fragile of the five.

Where the Model Breaks

The risk register on a Bitcoin treasury company is not the same as the risk register on holding spot Bitcoin. It's strictly worse, in known and predictable ways:

1. mNAV compression. This is the canonical kill-switch. If mNAV falls and stays below 1.0x, the issuance flywheel reverses. The company can't raise equity without destroying BTC-per-share, debt becomes harder to roll, and the market starts pricing the stock as a leveraged BTC bet without the BTC Yield kicker. Strategy briefly traded near 0.9x mNAV during 2026 drawdowns. Smaller imitators have traded at 0.4x – 0.7x for extended stretches.

2. Refinancing risk on convertibles and preferreds. Convertible notes have maturities. Preferreds have call features and dividend obligations. STRC's 11.5% coupon is fixed-cost capital that needs to be served whether BTC is at $120K or $40K. A prolonged BTC bear market that compresses mNAV below 1.0x while convertibles approach maturity is the precise scenario that ended Celsius, BlockFi, and 3AC — different mechanics, same root cause: leveraged BTC exposure with calendar-driven liabilities.

3. Regulatory exposure. Strategy benefited from light-touch SEC treatment of its accounting choices through 2024-2025. That treatment is not guaranteed. The Tokyo Stock Exchange has explicitly considered excluding crypto-treasury firms from listing — a rule change that would force Metaplanet onto a less liquid venue and almost certainly compress its mNAV.

4. Concentration risk in custody and financing. Most treasury companies use a small number of custodians (Coinbase Custody, BitGo, Fidelity Digital Assets) and a small number of OTC desks for accumulation. A custodian incident or a desk relationship breakdown is a corporate-level event, not just a market event.

5. Founder concentration. Strategy is Saylor. Metaplanet is Gerovich. The brand premium attached to founder-led conviction is real, but it cuts both ways — a CEO succession event (planned or unplanned) would reprice the equity in ways that have nothing to do with the underlying BTC.

How to Read the Next BTC Treasury Headline

When you see the next "Public Company Adopts Bitcoin Treasury Strategy" headline (and there will be one within the week), the four questions to ask in order:

1. What's the mNAV they'll trade at? A new entrant with no track record and no embedded BTC Yield should trade at ~1.0x. If it pops to 2.0x on announcement, that's narrative premium and it will mean-revert.
2. What's the financing stack? Pure equity issuance is the weakest model. Convertibles + preferreds + ATM is the Strategy playbook. Without preferred-stock buyers, the model can't scale past a few hundred million.
3. Who's the BTC accumulation desk? Is there a real OTC relationship and a real custody arrangement, or is the CEO planning to buy on Coinbase retail? (This is not a joke — it has happened.)
4. What's the operating business doing? A BTC treasury layered on a profitable operating business (or even a stable cash-generative one) is meaningfully different from a BTC treasury layered on a shell. The former can survive an mNAV drawdown; the latter often can't.

The Bitcoin treasury company model is one of the most interesting capital-markets innovations of the cycle. It's also a leveraged bet on a single asset, dressed in equity-market clothes. Both things are true at once. The mNAV is where the truth shows up.

Sources

• Strategy Q1 2026 Financial Results Press Release (May 5, 2026)
• Strategy Acquires 34,164 BTC, Now Holds 815,061 BTC (April 20, 2026)
• Strategy BTC Dashboard
• Strategy Bitcoin Purchase History
• Bitcoin Treasuries — Strategy
• Bitcoin Treasuries — Metaplanet
• Simon Gerovich Q1 2026 holdings update tweet
• Simon Gerovich ¥770.9B equity raise tweet
• Metaplanet Reaffirms Bitcoin Strategy as JPX Moves to Exclude Crypto Firms
• BlockAI News internal: K-Wave Media Dumps $485M Bitcoin Treasury Plan for AI Infrastructure
• BlockAI News internal: Strategy Buys 34,164 BTC for $2.54B

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The next $1B BTC treasury announcement is closer than the next $74K Bitcoin print. We'll have the mNAV math and the capital-stack breakdown before the press release stops trending.