Quiksilver (ZQK) (ABC) (BBBY) (ABMD) (OAS) (AH) Upgraded

Quiksilver, Inc. (NYSE: ZQK), AmerisourceBergen Corp. (NYSE: ABC), Bed Bath & Beyond Inc. (NASDAQ: BBBY), Abiomed (NASDAQ: ABMD), Oasis Petroleum Inc. (NYSE: OAS) and Accretive Health, Inc. (NYSE: AH) upgraded by analysts.

Quiksilver, Inc. (ZQK) was upgraded by FBR Capital from an “Underperform” rating to a “Market Perform” rating. They have a price target of $4.00 on the company.

AmerisourceBergen Corp. (ABC) was upgraded by Stifel Nicolaus from a “Hold” rating to a “Buy” rating. They have a price target of $49.00 on the company.

Bed Bath & Beyond Inc. (BBBY) was upgraded by Cowen from a “Neutral” rating to an “Outperform” rating.

Abiomed (ABMD) was upgraded by Rodman & Renshaw from an “Underperform” rating to a “Market Perform” rating.

Oasis Petroleum Inc. (OAS) was upgraded by UBS AG (NYSE:UBS) from a “Neutral” rating to a “Buy” rating. They have a price target of $4.95 on the company, down from $33.00.

Accretive Health, Inc. (AH) was upgraded by BB&T (NYSE:BBT) from a “Hold” rating to a “Buy” rating.

Dividends on (ABC) (ARDNA) (MLM) (TSX:PPL) (TSX:ATP) Declared

AmerisourceBergen Corp. (NYSE:ABC), Arden Group, Inc. (NASDAQ:ARDNA), Pembina Pipeline Corp. (TSX:PPL), Atlantic Power Corp. (TSX:ATP) and Martin Marietta Materials Inc. (NYSE:MLM) declare dividends.

The Board of Directors of AmerisourceBergen Corp. (ABC) declared a quarterly common stock dividend of $0.115 per share payable 6/6/11 to shareholders of record at the close of business on 5/24/11.

The Board of Directors of Arden Group, Inc. (ARDNA) declared a quarterly common stock dividend of $0.25 per share payable 7/20/11 to shareholders of record at the close of business on 6/30/11.

The Board of Directors of Pembina Pipeline Corp. (TSX:PPL) declared a May dividend of C$0.13 per share payable 6/15/11 to shareholders of record at the close of business on 5/25/11.

The Board of Directors of Atlantic Power Corp. (TSX:ATP) declared a May stock dividend of C$0.0912 per share payable 6/30/11 to shareholders of record at the close of business on 5/31/11.

The Board of Directors of Martin Marietta Materials Inc. (MLM) declared a quarterly common stock dividend of $0.40 per share payable 6/30/11 to shareholders of record at the close of business on 6/1/11.

Dividend Yields for (SYK) (UNH) (ABC) (MCK) (DGX)

Indicated dividend yields for Standard & Poor's 500 Index companies Stryker Corp (SYK), UnitedHealth Group Inc (UNH), AmerisourceBergen Corp (ABC), McKesson Corp (MCK) and Quest Diagnostics Inc (DGX).

These dividend data indicate dividend yields of companies in the Standard & Poor's 500 Index as of Saturday, April 30. The yield is determined by taking the latest declared dividend, annualized and divided by the price of the stock. Payout ratios are calculated based on latest quarterly dividend paid divided by earnings.

Stryker Corp (SYK) has a dividend yield of 1.22 percent on a declared dividend of $0.18. The payout ratio is 22.8 percent.

UnitedHealth Group Inc (UNH) has a dividend yield of 1.01 percent on a declared dividend of $0.12. The payout ratio is 10.2 percent.

AmerisourceBergen Corp (ABC) has a dividend yield of 0.98 percent on a declared dividend of $0.10. The payout ratio is 12.8 percent.

McKesson Corp (MCK) has a dividend yield of 0.87 percent on a declared dividend of $0.18. The payout ratio is 29.5 percent.

Quest Diagnostics Inc (DGX) has a dividend yield of 0.71 percent on a declared dividend of $0.10. The payout ratio is 11.4 percent.