GGT was "pumped up" by a Forbes article (Michael Foster)- see below
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"Mario Gabelli has made billions for investors over the years using sound investing principles made famous by Warren Buffett. Gabelli uses his deep Wall Street connections and disciplined investing strategy to choose the best media stocks for his Gabelli Multimedia Trust (GGT), which is why it’s up 18.1% annualized over the last decade.
GGT’s 10.5% dividend yield means this fund is a serious income generator, too. That’s driven a lot of investors to jump into GGT over the last few months, placing the fund’s market price right around par with its NAV. But that trend is showing no signs of ending—expect GGT to command a huge premium to NAV in the next few months, just like it’s done several times in the past."