Yokohama DeNA Baystars, which became real on December 1st by an acquisition by DeNA, a company runs social game networking service Mobage, announced [J] the new team logo on December 9.

Its “DeNA” part is not so similar with the DeNA’s company logo.
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The former logo of Yokohama Baystars was this,

Yokohama Baystars was one of few pro-baseball teams which did not have owner company’s name (which is TBS, nation-wide TV broadcasting network company). Most of 12 teams have a company name in it and the owners sponsor teams by seeing it as a part of advertising.
See Also:
Asiajin » Mobage Company DeNA Rumored To Buy A Pro Baseball Team, PR Denied
Asiajin » Social Game Networking Mobage Reported To Own Pro-Baseball Team In Japan
Asiajin » Yokohama DeNA Bay Stars – DeNA(Mobage) Agrees To Purchase Pro Baseball Team