Bitcoin (BTC) ended the third quarter of 2026 up 42.71%, its strongest third-quarter performance in nine years, according to a report published by COINOTAG on October 1, 2026. The figure was recorded at Wednesday's quarterly settle, which fell on September 30, 2026.

The close marks a sharp reversal from the first half of the year. Bitcoin spent the opening six months of 2026 on the back foot, shedding 22.1% in the first quarter and a further 14.2% in the second, so few trading desks expected the books to close the way they did, the report noted. The scale of that reversal is visible in the reported figures themselves: the roughly 57-percentage-point swing from the second quarter's decline to the third quarter's gain captures how much movement sat behind the headline settle. Compounding the reported quarterly moves also shows the rally recovered most, though not all, of the first-half damage, leaving the asset roughly 4.6% below its start-of-year level at the September 30 settle.

For context, 2017 was the last year Bitcoin produced a stronger third quarter. In July–September 2017, the asset gained more than 70% as it climbed toward its then all-time high near $20,000, a level it reached that December. Bitcoin, launched in 2009, remains the largest cryptocurrency by market capitalization, and its quarterly closes are widely used benchmarks for tracking performance across digital-asset markets. With one quarter now left in the year, those benchmark readings point to the final stretch: based on the reported figures, Bitcoin entered October below its start-of-year level, so the fourth quarter will determine whether the 2026 calendar-year close lands in positive or negative territory.

This content was first published on COINOTAG: https://en.coinotag.com/bitcoin-btc-best-third-quarter-since-2017-42-71-gain