Wellness Pet, a pet-food maker backed by private equity firm Clearlake Capital Group, is preparing to go public in the U.S. as soon as this year, according to people with knowledge of the matter.

The Tewksbury, Massachusetts-based company plans to seek more than $600 million in the initial public offering the people said, asking not to be identified discussing private information. The company could be valued at around $2.5 billion in the transaction, one of the people said.

Representatives for Wellness Pet didn’t respond to requests for comment. Representatives for Clearlake, Goldman Sachs, Morgan Stanley and Bank of America declined to comment.

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