Mumbai, April 21 -- The US stocks mostly stayed weak in last session. The Nasdaq edged down 20.71 points (0.1%) to 16,286.45, the S&P 500 inched up 7 points (0.1%) to 5,282.70. The narrower Dow showed a more significant move to the downside, tumbling 527.16 points (1.3%) to 39,142.23. The steep drop by the Dow on the day largely reflected a nosedive by shares of United Health (UNH), with the healthcare giant plummeting by 22.4%. United Health tumbled to its lowest closing level in a year after the company reported weaker than expected first quarter earnings and cut its full-year profit forecast.

The Labor Department released a report showing a modest decrease by first-time claims for U.S. unemployment benefits in the week ended April 12t...