Hedge funds are shaking up corporate America and Wall Street couldn't be happier (gs, ms, agn, bkw)

Activist investing is up — way up — and that has been great news for Wall Street’s top investment banks. Hedge fund managers that agitate for changes at public companies, asking for everything from bigger dividends to outright sales, have grown their war chests, been taking on more targets, and had larger victories than ever. They have successfully instigated a larger dividend from General Motors, the split of PayPal from eBay, and the $70 billion sale of Botox-maker Allergan. And no com...