Sotheby's faces one hedge fund manager—Daniel Loeb of Third Point LLC—loudly banging down the doors over its performance. Meanwhile, another hedge fund is working behind the doors to get the company to sell its physical home.

Discover how United Rentals capitalized on economic shifts in Marcato Capital Management's compelling 2013 presentation, "Renting the Recovery."

Business Insider profiled Mick McGuire in 2013, shortly after Marcato was named U.S. equity hedge fund of the year by Absolute Return Alpha and McGuire was named emerging fund manager of the year by Institutional Investor. The piece traces his path from Pershing Square and an early chairmanship at Borders to founding Marcato in San Francisco at 34.

On Wednesday, global art auctioneer Sotheby's announced that its board of directors would review its capital allocation and financial policies, with results expected in early 2014.

Hedge fund manager Mick McGuire is not an art collector and has never felt the thrill of bidding in a Sotheby's auction, where adrenaline spikes with each multimillion-dollar sale of a Cezanne, Rothko or Picasso.

Call it the battle of the mini-titans. Two new activist hedge funds — one run by a former Carl Icahn lieutenant and the other by one of Bill Ackman’s former portfolio managers — are battling with more established rivals to become the fastest-growing funds of the year.

Auto parts maker Lear Corp avoided a proxy battle with investors Marcato Capital Management LLC and Oskie Capital Management LLC by agreeing to increase and quicken the pace of its share buyback program and add a board member.