There are 2 companies tagged `buyback`; raised $250M from 13 investors
Chegg raised $249.9M from GSV Capital, Ace Limited, Pinnacle Ventures, TriplePoint Capital, Insight Venture Partners, Insight Venture Partners, Kleiner Perkins Caufield & Byers, Foundation Capital, Gabriel Venture Partners, Primera Capital, Primera Capital, Gabriel Venture Partners, and FLOODGATE in 9 rounds.
Cha-ching! Chegg raises $25M more for textbook and education platform 
venturebeat.com
Chegg Receives Investment from GSV Capital 
finsmes.com
Textbook Rental Juggernaut Chegg Adds Another $75 Million To Its Coffers 
techcrunch.com
Chegg.com Secures $112 Million to Fund Explosive Growth in Online Textbook Rentals 
sanfrancisco.bizjournals.com
Textbook-Rental Service Chegg Raises $57 Million, SEC 
blogs.wsj.com
Chegg.com Secures $112 Million to Fund Explosive Growth in Online Textbook Rentals sanfrancisco.bizjournals.com
Confirmed: Kleiner Perkins Gets Into Textbook Rentals As Chegg Raises $25 Million techcrunch.com
Oren Zeev, Primera Capital 
primeracapital.com
http://venturebeat.com/2007/01/18/used-textbook-site-chegg-hits-nerve/ venturebeat.com
Book Buyback Company raised $100K .