Vivus Inc. (VVUS) said it would postpone its annual shareholder meeting until Thursday, delaying a crucial vote that could shuffle its management team and replace its board with a slate of nominees proposed by an activist investor.

Vivus, the maker of a new treatment for obesity, has for months been locked in a battle with its largest independent shareholder, First Manhattan Co. The investment firm has criticized Vivus' launch of the drug and blamed it for disappointing sales of Qsymia, the first federally-approved weight-loss drug in more than a decade. First Manhattan owns about a 9.9% stake in Vivus.

The meeting, which had been scheduled for Monday, will decide whether Vivus management is permitted to continue running the pharmaceutical drug company. The company has defended its sales approach, saying the obesity drug market would have to be built gradually to avoid mistakes that have derailed older obesity drugs.

First Manhattan, based in New York, has proposed replacing Vivus's nine-member board with its own slate of directors and having its hand-picked chief executive candidate, former AstraZeneca PLC (AZN) executive Tony Zook, take over Vivus.

Vivus appeared to offer an olive branch Saturday when it issued a press release inviting three of First Manhattan's nominees to join its board regardless of the vote Monday, citing conversations with investors in which it had "become clear to the Vivus board that many stockholders favor some change." The move was interpreted by some as a sign that Vivus management expected at least a partial defeat.

The peace offering was short-lived. On Sunday, Vivus said First Manhattan advisers had made "false and misleading statements" to Vivus investors and that it had adjourned its annual meeting until Thursday as it allowed investors time to consider accurate information.

First Manhattan criticized what it called Vivus' delay tactics, saying in a statement that it had been negotiating with Vivus to reach a settlement in the proxy fight. The negotiations occurred over several days and as late as Sunday evening.

"Instead of continuing these negotiations, Vivus' board and CEO have resorted to tactics that we believe are simply aimed at preserving their entrenched position," First Manhattan said. "Vivus' stated reason to adjourn the vote is just a pretense to buy time in an attempt to improperly influence the election, in our view."

Vivus said First Manhattan's false statements pertained to the recommendations of the proxy advisory firm Institutional Shareholder Services Inc., which had recommended investors vote for three of the dissident shareholder's nominees. Another proxy advisory firm, Egan-Jones Proxy Services, recommended investors vote for all nine.

Vivus did not specify the alleged misleading statements but said it had informed the U.S. Securities and Exchange Commission of its claims and provided supporting documentation. Vivus also claimed that First Manhattan had failed to make necessary disclosures to the SEC.

First Manhattan denied the allegations, saying "nothing that is required to be filed with the U.S. Securities and Exchange Commission has not already been filed."

Write to Joseph Walker at Joseph.Walker@dowjones.com

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