Klarman’s $27 billion Boston-based hedge fund declined about 3.8 percent in September, bringing its loss to about 6.6 percent for the year through the end of September, said a person with knowledge of the matter, who asked not to be named because the information is private. Baupost, which manages multiple partnerships that have varying returns, told investors in a letter that some holdings rebounded in October, said the person. Baupost was hurt...