Updated from 11:03 a.m. ESTSince most hedge funds get paid based on their returns for the year, managers who want to get the most out of a stock investment often turn to shareholder activism as a way to increase shareholder value and ultimately boost their funds' returns. Here at Stockpickr.com we track many of the latest activist filings for investors interested in piggybacking of these activist funds. We highlight a few of the latest activist situations here. For example, on Feb. 12, MMI Investors issued a press release calling for Chemed ( CHE) to pursue a tax-free spinoff of Roto-Rooter, one of its two business segments. MMI estimates that a tax-free spinoff could potentially yield an increase of 40% to 75% per share to the valuation of Chemed as a publicly traded company. To read more, visit Stockpickr.com.