Last week Liberty converted almost 50% of its preferred shares of Sirius to common and in so doing it was able to increase its Sirius stake to 49.5 percent while also owning roughly 32 percent of common shares. Though it remains unclear what this will mean for investors, it does signal that the stock will likely not appreciate from current levels. So the question is what is the benefit of holding at this point? Just ahead of Liberty's conversion, Gabelli & Co. last week downgraded Sirius to sell. They have become aware that the stock rose artificially as Liberty was buying shares on the open market as it increased its holdings from 40%. If I were a Sirius or Pandora investor, I would try to embrace the idea that hope no longer serves as a sound investment premise. As well as both companies have performed so far on the year, I think it would be wise to be sellers of both stocks and seek shelter in other companies with less murky outlooks. Both stocks may start to see a downtrend as a result of what might be around the corner -- from Apple and Liberty. At the time of publication, the author was long AAPL and no position in any of the other stocks mentioned. Follow @rsaintvilus This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.