HODL Your Horses: JPX Threatens to Boot Crypto-Heavy Firms from TOPIX

Japan Exchange Group (JPX) is giving crypto treasuries the side-eye, potentially blocking firms that park over 50% of their assets in Bitcoin from the prestigious TOPIX index. Metaplanet's October 2026 TOPIX listing is now looking shakier than a DeFi protocol with a $10M TVL. The proposed guidelines would slam the door on new crypto treasuries exceeding the 50% threshold, while existing ones already chilling on TOPIX would get kicked to the curb if adopted. JPX has put out a call for stakeholder feedback, because nothing says "we care about your opinion" like a policy that could obliterate your market cap.

If this proposal actually passes, Metaplanet's scheduled October 2026 TOPIX reconstitution could be deader than a liquidity pool at 3am on a Tuesday. The company got upgraded from small-cap to mid-cap in October 2025, earning shiny new spots on the FTSE Japan Index and FTSE All-World Index, which brought increased institutional exposure for the 3350 stock. Nothing says "we've made it" quite like getting bumped to the big leagues, only to have the refs change the rules mid-game.

A JPX spokesperson noted the exchange is "monitoring companies that raise concerns from a risk and governance perspective, with a view to protecting shareholders and investors." How touching. The crackdown isn't entirely new—last November, JPX told Bloomberg it was weighing guidelines to shield investors from wild market volatility, particularly after Metaplanet stock tanked 75% following a 400% surge earlier in 2025. Nothing like protecting investors from the exact volatility they signed up for when they bought a Bitcoin treasury play.

The timing is rougher than a rug pull on a Monday morning. Metaplanet's TSE-listed shares (3350) closed at $1.87 on April 3rd—down 86% from 2025 highs of $13.30. Exclusion from TOPIX could trigger passive outflows from indices and domestic investors using the benchmark. Nothing says "diamond hands" quite like watching your index weight get vaporized while you're down 86%.

This isn't JPX's first rodeo either. The exchange previously proposed tougher merger rules and audits to curb crypto-linked volatility, because apparently having a Bitcoin treasury is just too spicy for Japan's refined market sensibilities. The situation echoes MSCI's similar proposals that hammered Strategy's MSTR stock in late 2025 and early 2026, sending it plummeting 60% from $365 to $147 before MSCI dropped the plans in January. Analysts had warned of potential $3B-$9B in passive outflows if other indices followed suit. Spoiler: they didn't.

Market watchers expect Metaplanet—the world's third-largest BTC treasury firm—to lobby against the rules, much like Strategy did. Whether