Activist fund Potomac Capital, which owns an 8% stake in Sigma Designs (SIGM -4.2%), issues an open letter that reiterates its nomination of three board members. Potomac airs a long list of complaints it has about Sigma's board and management, including a history of losses and equity dilution, and alleged conflicts of interest. Sigma recently terminated a poison pill and agreed to split it chairman and CEO roles in response to pressure from Potomac.
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