Career
He is currently playing for Djurgårdens IF of the Swedish Hockey League (SHL). Fernholm was selected by the Pittsburgh Penguins in the 4th round (101st overall) of the 2002 National Hockey League Entry Draft. Fernholm was drafted in the 4th round, 101st overall, in the 2002 National Hockey League Entry Draft by the Pittsburgh Penguins.
After beginning his career with Djurgårdens IF in 2004, he spent the 2005-2006 season in the United States, playing with the Penguins affiliates, the Wheeling Nailers and the Wilkes-Barre/Scranton Penguins.
He appeared in nine playoff games for the Nailers of the ECHL, recording a goal and three assists before returning to his native Sweden. Ferholm spent two seasons abroad in the Kontinental Hockey League with Neftekhimik Nizhnekamsk, Dinamo Minsk and Atlant Moscow Oblast before signing a one-year contract with HIFK in the Finnish Master of Science-liiga.
On July 21, 2014, Fernholm returned to Djurgårdens IF on a two-year deal starting in the 2014-2015 season.