According to the source, Metaplanet is reported to have become the 4th-largest corporate Bitcoin (BTC) holder after its latest acquisition, but traders should confirm this through Metaplanet’s Tokyo Stock Exchange timely disclosure documents before acting on the headline (source: Tokyo Stock Exchange Timely Disclosure Rules; Metaplanet Inc. Investor Relations). Metaplanet formally adopted Bitcoin as a treasury reserve asset in 2024 and has issued multiple BTC purchase notices since then that specify acquisition amounts and balances, which are the authoritative basis for holdings verification (source: Metaplanet Inc. press releases and timely disclosures in 2024). To validate any ranking, compare Metaplanet’s most recent disclosed BTC balance with peer corporate holdings documented in audited or regulatory filings such as MicroStrategy’s quarterly disclosures rather than media summaries (source: MicroStrategy investor relations and SEC filings; company financial statements). A trading workflow is to wait for a timestamped TSE filing, then monitor BTC-JPY spot liquidity and funding rates alongside price action in Metaplanet (ticker 3350) around the disclosure window to assess flow-through to crypto markets (source: Tokyo Stock Exchange market data; exchange funding-rate and order-book data providers).