Just four months after Blue Water Acquisition Corp. raised $50 million in an IPO, it set out on April 27 to merge with Clarus Therapeutics Inc., the developer of testosterone replacement therapy Jatenzo, valuing the Northbrook, Ill.-based firm at $379 million. Earlier in April, BCTG Acquisition Corp. announced plans to buy Cambridge, Mass.-based targeted precision cancer company Tango Therapeutics Inc. for $353 million, about seven months after completing its $167 million IPO. Both Clarus and Tango are seeking the public markets by merging with a special purpose acquisition company, or SPAC, a method that is becoming increasingly popular and an alternative to the traditional IPO.