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DreamWorks is the animated film house behind blockbuster movies like "Kung-Fu Panda" and "Shrek," and headed by CEO Jeffrey Katzenberg.
It's not clear whether Katzenberg will stay with the company should the deal go through.
The Journal notes that DreamWorks Animation's market value currently sits at at $2.3 billion, making the projected $3 billion deal a potential boon for DreamWorks.
The film studio, Universal Pictures, also sits under Comcast's umbrella. Universal operates its own animated film branch in Illumination Entertainment.