What happened

Strategy (NASDAQ: MSTR) — the company that used to be MicroStrategy — ripped higher on a day the S&P 500 went nowhere. Investing.com has it closing at $153.92, up 16.39% — a $21.67 day on 50.29m shares, against a 52-week range of $81.81 to $365.21. Yahoo Finance clocked it at $148.55, about +12%, at 11:57 am ET, so the last two hours did real work. Nothing changed inside the company. Bitcoin climbed back above $80,000 at the US open, up about 5.5% in 24 hours and topping $81,000 intraday after weekly lows near $75,000 (CoinDesk).

Why it moved

1. Bitcoin bounced, and Strategy's cost base is right there. It holds 845,050 BTC at an average of $75,412 a coin — $63.7bn spent, over 4% of bitcoin's 21 million supply cap (The Block, 14 Sep). Remember that average: at this week's low of $75,972 the whole stack sat a few hundred dollars from break-even. At $80,888 it's about $5,500 a coin in the money.

2. The SEC opened the door to tokenised stocks. On 17 September it granted a five-year "innovation exemption" letting tokenised US stocks trade on blockchain venues without those venues registering as exchanges. The catch that matters: a token must carry the same rights as the real share — dividends and voting — so synthetic exposure tokens are out. Michael Saylor called it "a major breakthrough for digital credit and American capital markets" and said it opens a path for tokenised MSTR and STRC shares to trade onchain 24/7.

3. A bitcoin reserve bill cleared committee. On 16 September the House Financial Services Committee advanced H.R.8957, the American Reserve Modernization Act, which would write the US Strategic Bitcoin Reserve into law and let Treasury add coins over five years by budget-neutral means. Committee stage only — no Senate companion has passed.

Then the mechanical part: roughly $470m of shorts were liquidated in 24 hours, $238m of them bitcoin shorts (CoinDesk). Forced buying is what turns a resistance break into a 5% day.

Why the stock moved three times as hard as the coin

Strategy trades on mNAV — equity value divided by the market value of the bitcoin it owns. mnav.com puts it at 1.08x: $1.08 of share price per $1 of bitcoin, against a $66.1bn pile. Ahead of the common sit about $21.2bn of senior claims — convertible notes and preferred shares — fixed in dollars. When the coins gain, almost nothing accrues to those claims and nearly all of it lands on the common. Fixed debt plus a rising asset is leverage, and it runs just as hard in reverse.

Valuation

There is no usable P/E: trailing EPS is -$99.30 (Investing.com), because Q2 2026 carried an $8.32bn unrealised bitcoin markdown, producing an $8.22bn net loss and -$24.45 EPS. A five-year earnings multiple here is noise — that line is marks, not operations. The traded multiple is mNAV: 1.08x, inside a 12-month range of 0.82x to 1.43x, on a market cap of $58.65bn at the close. The closest listed comparison, Metaplanet (TSE: 3350), holds 43,000 BTC worth $3.45bn and trades at 0.92x — an 8% discount to its own coins — with a 12-month range of 0.76x to 1.59x. Same model, one at a premium, one at a discount.

The business

• The bitcoin treasury: 845,050 BTC, about $66.1bn. Effectively the whole company.
• The original software business: enterprise analytics. Q2 2026 revenue $122.4m, up 6.9% year on year at a 66.6% gross margin — real, and a rounding error next to the coins.
• "Digital credit": the preferred classes (STRC, STRK, STRF, STRD) that fund the buying. Cumulative preferred dividends paid: $1.06bn, against a $5.1bn USD reserve as of 14 September.

So this isn't a software company with a crypto side-project. It's a leveraged bitcoin balance sheet that owes a dollar dividend every quarter.

Who else it touches

• Coinbase (COIN) +11% to $192.43 — the coin bounce plus a cleaner route to sell tokenised equity products. We decoded its last jump here.
• Robinhood (HOOD) about +7%; Circle (CRCL) about +5.7%.
• iShares Bitcoin Trust (IBIT) +6% — the unlevered version of the same move, and the fair benchmark for whether Strategy's leverage is paying you.

The rest of the tape disagreed: US equities traded lower and Treasury yields pushed above 5%. Full board on the movers page.

The one risk that flips it

Bitcoin back under $75,412 puts all 845,050 coins underwater, and the preferred dividends still have to be paid in dollars from that $5.1bn reserve, not in bitcoin. mNAV has touched 0.82x in the past year — shares changing hands 18% below the coins they represent. And the reserve bill has cleared one committee, not Congress.

What to watch

Results are due 4 November 2026, when the quarter's bitcoin mark hits the income statement again (calendar). Before that: whether the Senate picks up a companion to H.R.8957. The Clarity Act failed there this week, which is why the SEC moved on its own.

As of 4:00 pm ET, 18 September 2026. Sources: Investing.com, CoinDesk, Yahoo Finance, The Block, Benzinga, Congress.gov, mNAV. For discussion and education only — not investment advice. Verify before acting.