Morning Market Losers

Puma Biotechnology

shares declined 18.47% to $62.31 after the company presented positive PB272 Phase II data at ASCO. MasTec

shares dropped 11.47% to $31.99 following Sunday's report of weak outlook. Universal Electronics

declined 8.49% to $41.62. B Riley downgraded Universal Electronics from Buy to Neutral and cut the price target from $47.00 to $45.75. Clovis Oncology

shares fell 8.16% to $47.03 after the company presented encouraging data from Phase 1/2a study evaluating lucitanib in advanced solid tumors at ASCO. Zillow

tumbled 3.48% to $113.91 after RBC Capital downgraded the stock from Outperform to Sector Perform. Cyclacel Pharmaceuticals

slipped 2.47% to $3.16 after the company provided an update on its clinical development plan of Sapacitabine for myelodysplastic syndromes.