BlockBeats News, July 15th. The U.S. Securities and Exchange Commission announced that the rule change submitted by the New York Stock Exchange on July 6th has immediately taken effect. The change increases the position limit and position accountability level for the BlackRock Bitcoin Spot ETF (IBIT) options from 250,000 contracts to 1 million contracts, in order to accommodate the rapid growth in IBIT options trading volume, enhance market liquidity, and improve market maker capabilities.