According to the source, a post on X dated Sep 19, 2025 reports that an ETH whale opened a 25x leveraged long totaling 21,966 ETH with a notional value of about $99.5M (source: X post, Sep 19, 2025). Based on those figures, the implied initial margin is approximately $3.98M, calculated as $99.5M divided by 25 (source: X post, Sep 19, 2025; calculation by the reporter). The post also claims the trader’s historical win rate is 81% (source: X post, Sep 19, 2025).