Pfizer, in a regulatory filing, said it would be producing records in response to the civil investigative demand from the U.S. Attorney’s office for the Southern District of New York.

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Meridian, a unit of Pfizer that manufactures EpiPen injectors used to deliver an emergency allergy antidote, has been hit by a series of manufacturing problems in recent years. Mylan NV, which markets EpiPens, has recalled tens of thousands of the devices after complaints that some had failed to activate.

Bristol-Myers Squibb has been meeting with shareholders in Boston and New York over the last two weeks to try to salvage its $74 billion purchase of cancer drugmaker Celgene Corporation (CELG), the biggest acquisition announced so far this year.

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The deal, announced in January, was hard sell to Bristol shareholders from the start. The acquisition adds about $32 billion in fresh debt to Bristol’s balance sheet while assuming $20 billion in Celgene’s debt, the companies said at the time. After factoring in debt, the acquisition was the largest health-care deal on record, according to data compiled by Refinitiv.

Now, hedge funds Wellington Management and Starboard Value say the deal doesn’t sit well with them. Bristol has sent executives to New York to meet with institutional investors several times over the last two weeks and met with investors in Boston on Wednesday and Thursday, according to a person who briefed on the meetings.

Bristol-Myers declined to comment.