American Bitcoin Corp (ABTC), a Bitcoin mining company backed by the Trump family, has seen its stock price plummet due to a broader cryptocurrency market downturn and the end of an internal lock-up period. The company's shares have lost nearly 90% of their value since their peak in September last year. According to its latest financial report, ABTC reported a loss of $59 million in the fourth quarter of 2025. Despite the losses, ABTC's Q4 revenue reached $78.3 million with a gross margin of 53%, indicating mining costs were 53% lower than spot prices. The company ended the year with a Bitcoin reserve of 5,401 coins, which has since increased to over 6,000 coins.