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 which1,456 crore was on account of complete exits made by six PE players including Sequoia Capital, WestBridge Ventures and Aquarius Investments.