CleanSpark, Inc. (Nasdaq: CLSK) produced 529 bitcoin in September 2026, with an average daily output of 17.64 bitcoin and a peak single-day production of 18.99 bitcoin, according to the company's unaudited monthly operational update.

The company reported an operational hashrate of 50 EH/s and an average operating hashrate of 36.0 EH/s for the month. Its deployed fleet stood at 199,745 miners as of September 30, with a peak efficiency of 16.07 joules per terahash. CleanSpark held 1.8 gigawatts of power under contract, utilizing 808 megawatts.

CleanSpark's bitcoin holdings totaled 13,530 as of September 30, down from 13,703 at the end of August. The company sold 2 bitcoin at spot and 700 bitcoin through call exercises during the month, at an average price of $72,928 per bitcoin. Of the total holdings, 3,475 bitcoin were posted as collateral or receivable related to derivative transactions.

The company's wholly owned subsidiary, CSDC Finance I, LLC, closed on $2.276 billion in aggregate principal of 7.875% senior secured notes due 2031. The proceeds are designated to fund data center construction under a lease that CleanSpark says is expected to generate approximately $6.6 billion in contracted revenue over its initial term.

CleanSpark also announced it will discontinue monthly operational updates and transition to standard quarterly reporting. Calendar year 2026 bitcoin production through September totaled 5,432.