ith market caps above $10bn. Yet not all super campaigns were successful. TCI failed in its move to oust the chairman of the London Stock Exchange, Greenlight Capital failed in its campaign to split the company's stock and get a seat on the board at General Motors and Pershing Square's Ackman didn't get voted onto

d in 2005 by Nelson Peitz, Peter May and Ed Garden, has taken a different approach and pledged to work with management. Billionaire David Einhorn's Greenlight Capital has bought shares in BNY Mellon this year, anticipating the bank will benefit from an increase in interest rates. A combination of rising revenue an