Yesterday we reported that Newt Gingrich, who recently referred to Mitt Romney’s Bain Capital activities as “exploitative,” earned tens of thousands of dollars from keynoting a 2009 event in Los Vegas for private equity deal-makers. This followed up on a Bloomberg report that he earned around $60,000 for speaking at the 2009 annual meeting of private equity firm JLL Partners.

Fortune has since learned that Gingrich also spoke at events in 2008, 2009 and 2010 hosted by different private equity firms.

• The first was a January 2007 annual meeting of The Jordan Company, a New York-based  private equity firm with around $6 billion in capital under management.
• The following year, Gingrich spoke at the annual meeting of Snow Phipps, a mid-market private equity firm with around $1.5 billion in capital under management.
• Then Gingrich debated former senator Tom Daschle on healthcare policy at a 2010 event sponsored by Water Street Healthcare Partners.

Assuming that Gingrich was paid around $60,000 for each of these appearances — plus the previously disclosed Las Vegas and JLL Partners events — the former Speaker earned approximately $300,000 from a private equity industry he has spent the past month denigrating. Each of the appearances was booked through the Washington Speakers’ Bureau, which listed Gingrich in its highest fee category of “$40,001 and Up.”

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