LONDON--A major shareholder in investment vehicle Tetragon Financial Group Ltd. (TFG.AE) is suing the company's board for allegedly mismanaging last year's takeover of hedge-fund group Polygon Management LP and helping divert funds to two Polygon principals who sit on TFG's board.

Omega Partners, part of Leon Cooperman's New York-based Omega Advisors Inc., claims in the suit that Polygon co-founders Patrick Dear and Reade Griffith profited at the expense of TFG shareholders in TFG's October purchase of Polygon. The suit alleges that the two men made tens of millions of dollars by timing the transaction before a share repurchase by TFG that boosted the value of TFG shares.

TFG agreed to pay Mr. Reade and Dear and other Polygon employee-owners 11.7 million in TFG shares worth around $97 million in exchange for Polygon and stakes it held in two other asset managers, according to the October announcement of the acquisition.

Omega in the lawsuit says TFG "was fleeced by the deal" and could have used far fewer shares to pay for it if the share buyback had happened before rather than after the purchase was announced.

"The structure and timing of these transactions underscores the fact that they were designed by defendants to benefit the principals to the detriment of TFG and its shareholders," Omega said in the suit, filed Tuesday in the U.S. District Court for the Southern District of New York.

The investment firm said it wants TFG to alter the terms of the Polygon transaction and replace the Polygon affiliate that advises TFG on its investments. It is seeking unspecified damages from the defendants on behalf of TFG.

TFG in a statement Wednesday said it and its board believe "that the [suit] action is factually and legally without merit and intend to seek to have the action dismissed as quickly as possible." A spokesman for Tetragon Financial Management, the investment adviser of TFG that is controlled by Mr. Dear, Mr. Griffith and a third former Polygon partner not named in the suit, said the claims are specious, "with no basis in fact or law" and come nearly eight months after the Polygon acquisition was announced and after a 27% increase in TFG's share price since then.

Mr. Dear and Mr. Griffith declined to comment.

Polygon floated TFG on Euronext Amsterdam in 2007 to invest in credit instruments. It went on to expand its mandate to include taking stakes in asset managers and now has about $1.7 billion in assets and a market cap of $1.38 billion. Mr. Dear and Mr. Griffith, Polygon's principals, control TFG through voting shares, and serve on TFG's board along with three executives at the Polygon affiliate that is TFG's investment adviser and four non-executive directors.

"The web of interrelated entities with overlapping boards, ownership and management was designed by defendants Dear and Griffith to obscure the full extent of the manipulative and self-interested transactions involving TFG, Polygon and related affiliates," the Omega suit claims.

TFG shares traded up 1.3% Wednesday, to $10.44 a share, after having sunk as low as $0.57 when Tetragon Financial Management wrote down the value of TFG's assets in the financial crisis. It went on to write them back up as the crisis subsided, raising the ire of shareholders by collecting around $200 million in performance fees on the paper gains.

TFG shareholder Daniel Silverstein filed a suit against the Polygon principals and TFG's other directors in 2011 to try and win back those fees, but the case was dismissed last year in the same Manhattan court where the Omega suit was filed. The judge on the Silverstein case, Jed Rakoff, said the claim didn't have merit because Mr. Silverstein bought his stock after the compensation plan was put in place and publicly known.

Omega Partners has held stock in TFG since September 2009 and estimates that it is TFG's largest shareholder, with more than 5 million shares. Mr. Cooperman in January told CNBC the stock was one of his top tips for 2013. Mr. Cooperman is based in the U.S. and couldn't immediately be reached for further comment early Wednesday.

Analysts at Liberum Capital said TFG's "structural issues," such as having shares that don't come with any voting rights, mean the company's stock will likely continue to trade at a sharp discount to the value of its underlying assets.

Shares in investment companies can trade at a discount or premium to the value of their assets, depending on investor sentiment.

The analysts said the way the company calculates performance fees is also weighing on the stock price. In contrast to most hedge funds that must regain any losses before collecting performance fees, TFG's performance is assessed each quarter, and Polygon collects 25% of any gains.

The TFG purchase of Polygon didn't include the affiliate that collects management and performance fees on TFG's investments. Shareholders had no vote on the deal, which TFG said was conducted without the involvement of Mr. Dear and Mr. Griffith after it got independent advice.

-Write to Margot Patrick at margot.patrick@dowjones.com

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