table of contents hologic , inc . notes to consolidated financial statements ( continued ) ( all tabular amounts in thousands except per share data ) which the cytyc stockholders received a premium over the fair market value of their shares on such date and cash of $ 16.50 per share ( or approximately 35% ( 35 % ) of the merger consideration ) . there were no preexisting relationships between the two companies . cytyc , headquartered in marlborough , massachusetts , is a diversified diagnostic and medical device company that designs , develops , manufactures , and markets innovative and clinically effective diagnostics and surgical products . cytyc products cover a range of cancer and women 2019s health applications , including cervical cancer screening , prenatal diagnostics , treatment of excessive menstrual bleeding and radiation treatment of early-stage breast cancer . upon the close of the merger , cytyc shareholders received an aggregate of 132 million shares of hologic common stock and $ 2.1 billion in cash . in connection with the close of the merger , the company entered into a credit agreement relating to a senior secured credit facility ( the 201ccredit agreement 201d ) with goldman sachs credit partners l.p . and certain other lenders , in which the lenders committed to provide , in the aggregate , senior secured financing of up to approximately $ 2.55 billion to pay for the cash portion of the merger consideration , repayment of existing debt of cytyc , expenses relating to the merger and working capital following the completion of the merger . as of the closing of the merger , the company borrowed $ 2.35 billion under this credit agreement . see note 5 for further discussion . the aggregate purchase price of approximately $ 6.16 billion included $ 2.1 million in cash ; 132 million shares of hologic common stock at an estimated fair value of $ 3.67 billion ; 16.5 million of fully vested stock options granted to cytyc employees in exchange for their vested cytyc stock options , with an estimated fair value of approximately $ 241.4 million ; the fair value of cytyc 2019s outstanding convertible notes assumed in the merger of $ 125.0 million ; and approximately $ 24.2 million of direct acquisition costs . there were no potential contingent consideration arrangements payable to the former cytyc shareholders in connection with this transaction . the company measured the fair value of the 132 million shares of the company common stock issued as consideration in connection with the merger under eitf 99-12 . the company determined the measurement date to be may 20 , 2007 , the date the transaction was announced , as the number of shares to be issued according to the exchange ratio was fixed without subsequent revision . the company valued the securities based on the average market price a few days before and after the measurement date . the weighted average stock price was determined to be $ 27.81 . ( i ) purchase price the purchase price is as follows: .
what percentage of the total estimated purchase price was cash?
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