(Bloomberg) — Robert Benmosche, who led American International Group Inc. for half a decade, said an emerging challenge from Warren Buffett's Berkshire Hathaway Inc. hasn't amounted to much so far.

Buffett's firm recruited AIG executives beginning last year to expand commercial coverage under the Berkshire Hathaway Specialty Insurance brand. Benmosche said those who left AIG didn't buy in to his efforts to increase collaboration.

“They took their bitterness out on AIG and wanted to make a big show,” Benmosche, 70, said in an interview with Bloomberg Television's Betty Liu airing today. “They went over there and, boy, are they really not showing us anything at all.”

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