TSL said the deal was expected to close in the third quarter of 2013.
Charterhouse bought the business from fellow UK private equity firm Exponent for an undisclosed amount in May 2007.
TSL said TPG’s investment would allow it to grow its “considerable” presence in the education sector and accelerate its online and offline growth plans.
TPG managing partner Karl Peterson said, “TSL is well known for its longstanding and vital role in the UK education sector.
“Over the past several years [CEO Louise Rogers] and her team have done an outstanding job in transitioning the business to become the leading site for teachers both online and in print while gaining a sizeable and growing audience across the globe.
“TPG’s global presence and extensive online experience fit well with the company’s ambitions and we anticipate accelerating growth through further investments in TSL’s digital capabilities.”
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