Private equity firms Blackstone and TPG will spend more than $13 billion to buy women’s health specialist Hologic.

The companies said Tuesday they will pay up to $79 for each Hologic share in a deal that takes the company private.

Shares of Hologic rose after markets opened Tuesday. The companies said the price represents a premium of about 46% to the stock’s closing price in late May, before media reports surfaced about a possible deal.

The terms include $76 in cash for each share plus extra payments when the deal closes and if the company’s breast health business meets some revenue goals.

Overall, the deal’s value rises to $18.3 billion when counting Hologic’s $2.2 billion in cash and short-term investments and $2.5 billion in debt.

Hologic makes mammography systems, breast imaging

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