Stratford School Holdings, which has been owned by Quad since 2005, operates 15 campuses across the state ranging from pre-school to middle school.
Warburg has received antitrust status approval to go ahead with the deal according to a report by LBO Wire.
The firm already has investments in higher education provider Bridgepoint Education and China’s Xueda Education Group.
New York-based Quad bought Stratford with the backing of a group which included MCG Capital Corp, according to LBO Wire.
It said MCG Capital had contributed $17m in debt at the time.
The publicly traded business development company said then that it had owned about 20 per cent of Stratford School’s equity.
Private equity heavyweight Warburg is understood to have raised more than $5bn for its new fund in just over seven months.
The firm, which is chasing $12bn for its latest investment vehicle, has negotiated a tough fundraising environment by offering investors a 1.4 per cent management fee while taking 20 per cent carried interest.
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