According to @WatcherGuru, Tether bought 8,888 BTC valued at $779 million during Q4 2025, as reported in a post on Dec 31, 2025 (source: Watcher.Guru on Twitter, Dec 31, 2025). The post specifies the purchase size, notional value, and quarter, but does not include execution details or wallet addresses for independent verification (source: Watcher.Guru on Twitter, Dec 31, 2025). The reported accumulation indicates notable BTC treasury demand during Q4 2025 based solely on the figures disclosed in the post, making it directly relevant to trading context and order flow analysis for that period (source: Watcher.Guru on Twitter, Dec 31, 2025).