With Bitcoin trading around $109,500, BlackRock’s iShares Bitcoin Trust has been having a field day. IBIT, the fastest ETF to reach $70 billion in assets, logged 15 consecutive days of inflows before ending its streak on Tuesday.

The explosive popularity of the fund — it’s posted net inflows in 17 of the past 18 months — has been very lucrative for BlackRock. IBIT, with a 0.25% expense ratio, brings in annual revenue of $187.2 million, Bloomberg calculated. That’s more than BlackRock’s S&P 500 fund, IVV, with $187.1 million in fees, despite the latter containing about 9x as many assets. (It also charges far less, with an expense ratio of just 0.03%.)

According to Arkham Intelligence, BlackRock currently holds more than 696,000 bitcoin.