Life Technologies Corp. (LIFE) is reviewing two bids in a corporate takeover that has pitted a consortium of some of the world's largest buyout firms against medical-equipment maker Thermo Fisher Scientific Inc. (TMO), according to people familiar with the matter.

The buyout group, which includes Blackstone Group LP (BX), Carlyle Group LP (CG), KKR & Co. (KKR) and Singapore's state investment company Temasek Holdings, has made an offer of around $65 a share, the people said. It is unclear what Thermo Fisher bid.

The bids were an opening salvo and could change in negotiations.

If a deal is struck, it would be one of the year's largest. Life, with a stock market value of about $11.3 billion, has seen its shares rise 17% since the Carlsbad, Calif., company said in January that it had hired bankers to help it explore strategic options.

Shares closed Wednesday up 0.6%, or 39 cents, at $66.58.

Life's board and its advisers are expected to call the suitors to the negotiating table once they are finished reviewing the offers, some of the people said. A deal could be struck within days, they said.

Life sells laboratory supplies, such as reagents and antibodies, and equipment; it also has a genetic-testing business.

Thermo Fisher is also a maker of medical and laboratory devices and equipment.

Write to Ryan Dezember at ryan.dezember@wsj.com and Dana Cimilluca at dana.cimilluca@wsj.com

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