Activist unveils bank investment

Cliff Robbins, founder Blue Harbor Group
Adam Jeffery | CNBC

Activist investor Clifton Robbins thinks buying stock in Investors Bancorp is a near-sure way to make money.

"This is one of the best risk return investments I've seen," the CEO of hedge fund Blue Harbour Group said Monday at the 13D Monitor Active-Passive Investor Summit in New York.

Blue Harbour is a $3.7 billion hedge fund firm that focuses on friendly collaboration with the companies it invests in, unlike some of its more confrontational activist peers.