April 25 (Reuters) - U.S. stocks rose at the open on Tuesday, with the Nasdaq hitting the 6,000 point mark for the first time, amid a raft of strong corporate earnings and President Donald Trump's promise of a major tax reform plan.

Biogen provided the biggest boost to the Nasdaq after strong results.

The Dow Jones industrial average was up 155.57 points, or 0.75 percent, at 20,919.46, the S&P 500 was up 7.87 points, or 0.331487 percent, at 2,382.02 and the Nasdaq composite was up 20.35 points, or 0.34 percent, at 6,004.17. (Reporting by Yashaswini Swamynathan in Bengaluru; Editing by Anil D'Silva)

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