Benzinga's Top Upgrades, Downgrades For September 18, 2018

Loop Capital upgraded Union Pacific Corporation UNP from Hold to Buy. Union Pacific shares rose 4.65 percent to $164.00 in pre-market trading.
Bank of America upgraded L Brands Inc LB from Underperform to Neutral. L Brands shares rose 2.5 percent to $29.15 in pre-market trading.
Piper Jaffray upgraded Acceleron Pharma Inc XLRN from Neutral to Overweight. Acceleron Pharma shares climbed 4 percent to $54.00 in pre-market trading.
Wells Fargo upgraded Targa Resources Corp TRGP from Market Perform to Outperform. Targa Resources shares rose 0.97 percent to $55.18 in pre-market trading.

Macquarie downgraded United Continental Holdings Inc UAL from Outperform to Neutral. United Continental shares fell 1.1 percent to $89.19 in pre-market trading.
Citigroup downgraded Primerica, Inc. PRI from Neutral to Sell. Primerica shares fell 0.67 percent to close at $126.85 on Friday.
Nomura downgraded Playa Hotels & Resorts NV PLYA from Buy to Neutral. Playa Hotels & Resorts shares fell 1.84 percent to close at $9.58 on Monday.
Morgan Stanley downgraded Workiva Inc WK from Equal-Weight to Underweight. Workiva shares fell 6.21 percent to $35.50 in pre-market trading.
JP Morgan downgraded Red Hat Inc RHT from Overweight to Neutral. Red Hat shares fell 2.1 percent to $141.35 in pre-market trading.
Credit Suisse downgraded Express Scripts Holding Co ESRX from Outperform to Neutral. Express Scripts shares fell 0.56 percent to $94.70 in pre-market trading.
Pivotal Research downgraded Discovery Communications Inc. DISCA from Hold to Sell. Discovery shares fell 1.97 percent to $31.39 in pre-market trading.
Morgan Stanley downgraded BankUnited BKU from Overweight to Equal-Weight. BankUnited shares rose 0.12 percent to $37.27 in pre-market trading.
Roth Capital downgraded Superior Drilling Products Inc SDPI from Buy to Neutral. Superior Drilling Products shares fell 1.43 percent to $2.75 in pre-market trading.

Needham initiated coverage on Akcea Therapeutics Inc AKCA with a Buy rating. The price target for Akcea Therapeutics is set to $45. Akcea Therapeutics shares closed at $24.85 on Monday.
SunTrust Robinson Humphrey initiated coverage on Mimecast Ltd MIME with a Buy rating. The price target for Mimecast is set to $54. Mimecast shares closed at $40.13 on Monday.
BMO Capital initiated coverage on Walmart Inc WMT with an Outperform rating. The price target for Walmart is set to $110. Walmart shares closed at $94.82 on Monday.
Analysts at Stifel Nicolaus initiated coverage on Western Gas Equity Partners LP WGP with a Buy rating. The price target for Western Gas Equity Partners is set to $40. Western Gas Equity Partners shares closed at $33.32 on Monday.
BTIG Research initiated coverage on Transocean LTD RIG with a Buy rating. The price target for Transocean is set to $18. Transocean shares closed at $11.59 on Monday.
Analysts at Mizuho initiated coverage on Supernus Pharmaceuticals Inc SUPN with a Buy rating. The price target for Supernus Pharmaceuticals is set to $61. Supernus Pharmaceuticals shares closed at $46.00 on Monday.
Stephens & Co. initiated coverage on Apache Corporation APA with an Overweight rating. The price target for Apache is set to $52. Apache shares closed at $45.78 on Monday.
BTIG Research initiated coverage on Rowan Companies PLC RDC with a Neutral rating. Rowan shares closed at $15.69 on Monday.