shares of cleantech acquisition corp fell by more than a third to 615 after shareholders approved the blankcheck companys combination with nauticus robotics inc the specialpurpose acquisition company said in a securities filing tuesday that holders of 45 million shares representing about 74 of the companys outstanding shares voted in favor of the merger that will take nauticus public at a valuation of about 560 million with only 5500 votes against the filing also noted that holders of nearly 362000 shares tendered their stock for redemption leaving an estimated float of 14 million shares after the business combination according to securities filings nauticus an oceantaskautomation firm unveiled the takepublic plan back in december saying it would also raise 73 million through equity and convertible bonds in a private investment in public equity or pipe tied to its spac merger