It a was big week for meme stocks, with AMC Entertainment (AMC) leading the way. Over a two-day period, AMC traded over 8 million options contracts and 1 billion shares. While a lot of the action was from retail traders buying calls in AMC, there was also clearly institutional trading in the options. Some of the spreads and block trades were of the size normally executed by funds. One very interesting trade was a large call spread expiring June 18 that was done for zero premium (no cost but commissions and fees).