Mentor Graphics Corp. shares rose in the extended session Thursday after Elliott Associates and its subsidiaries reported doubling their stake in the electronics design company. Mentor shares rose 6% to $26.17 after hours. In a Securities and Exchange Commission filing, Elliott Associates LP, Elliott International LP, and Elliott International Capital Advisors Inc. disclosed at combined 8.1% stake in Mentor. According to FactSet data, Elliott previously held a 4% stake in Mentor.
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