Alex Roeper’s Atlantic Investing Management celebrated its 25-year anniversary in 2013 by beating the market almost across the board, according to a shareholder letter obtained by ValueWalk. Its concentrated US equity value fund, the Cambrian Fund, was up 38.3% for the year. The US equity long/short fund AJR/Quest was up 20.3% with strong alpha on the long side and neutral alpha on the short side. Cambrian Global was up 28.8% and Cambrian Europe was up 22.3% for the year. Most impressive, Cambrian Japan returned 42.9% in 2013, with net gains on every individual investment position. Atlantic currently has $1.9 billion in…