Check out the companies making headlines before the bell: Under Armour — The retail stock tumbled 21% after the American sportswear company posted first-quarter results that missed estimates. Under Armour reported adjusted earnings of 2 cents per share, lower than the FactSet consensus estimate of 3 cents per share. Revenue of $1.10 billion came in below the $1.13 billion expectation. Trade Desk — Shares tumbled 33%. A slew of Wall Street firms including Bank of America and MoffettNathanson downgraded the stock, even after Trade Desk's surprisingly strong earnings results, after CEO Jeff Green warned during the earnings call that "some of the world's largest brands are absolutely facing pressure" from tariffs and inflation. Viavi Solutions — Shares soared 20% following the network test and

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