I'll have to go through your list and see what the differences are: Your list is about 220. Mine is 130, but I have kept out those that are large cap as well as those that are just pennies.
Of note in the list, I listed NYSE-HEK together with OTCBB-CWDK because HEK recently announced a $625M buyout of CWDK. This is an interesting combination because HEK is a spac touted by the NYSE and CWDK is about as scammy as they get.
"We are very pleased to have Heckmann Corp. as our first Special Purpose Acquisition Company," said Noreen M. Culhane, EVP, Global Corporate Client Group, NYSE Euronext. "Special Purpose Acquisition Companies provide opportunities for investors and issuers previously available to professional investors only. After careful marketplace analysis over an extended period of time, we decided that recent changes in sponsorship, scale and deal structure warranted the listing of SPACs on the NYSE."