PE and VC type investors gave time restriction on capital deployed and have to return money and show exits. Shore has been selling for a while to the new set of investors.
Example was Equitas IPO too:
Equitas Holdings the biggest IPO during 2016 so far also had a substantial OFS component. The company raised 2,176 crore of which
1,456 crore was on account of complete exits made by six PE players including Sequoia Capital, WestBridge Ventures and Aquarius Investments.