When you own more Bitcoin than any other public company on Earth, a bad day for BTC is a very bad day for your balance sheet. Strategy, the company formerly known as MicroStrategy, watched over $690 million in value evaporate from its Bitcoin treasury as the price of BTC fell below $75,000.

Strategy holds hundreds of thousands of Bitcoin. At its peak valuation, that stash was worth around $65 billion, a figure that would make it one of the most valuable single-asset positions held by any public company.

When BTC dropped below the $75,000 mark, the resulting paper loss exceeded $690 million. Nobody sold anything, but the spreadsheet got a lot uglier overnight.

Under older GAAP accounting rules, the company had already recorded total Bitcoin impairment charges of roughly $690 million. Those rules required companies to write down digital asset holdings when prices dropped but didn’t let them mark the value back up when prices recovered. Newer fair-value accounting standards have since changed the game, allowing companies to reflect both gains and losses in real time.

The Strategy playbook: buy more