Lifshitz Law Firm Announces Investigation of Dynavax Technologies Corporation, Keynote Systems, Inc., sTec, Inc. and Vanguard Health Systems Inc.

NEW YORK, June 25, 2013 /PRNewswire/ --

Dynavax Technologies Corporation

Lifshitz Law Firm announces that a class action suit was filed in the United States District Court for the Northern District of California, alleging that Dynavax Technologies Corporation ("Dynavax" or the "Company") (DVAX) issued false and misleading statements to investors between April 26, 2012 and June 10, 2013, inclusive (the "Class Period").  On June 10, 2013, the Company disclosed that in a meeting with the FDA over its biologic license application for hepatitis-B vaccine Heplisav, the FDA expressed that it wanted additional safety data from more patients before approving the drug. The FDA further expressed that analyzing Heplisav for smaller groups of patients did not fully address its concerns and that it would like to see additional safety trials. Moreover, as previously noted by the FDA, the Company disclosed that there were ongoing concerns regarding Dynavax's manufacturing and testing of Heplisav.

For more information, please contact Joshua M. Lifshitz, Esq. by telephone at (212) 213-6222 Ext. 18 or by sending an e-mail including your contact information to: info@jlclasslaw.com.

Keynote Systems, Inc.

Lifshitz Law Firm announces an investigation into possible breaches of fiduciary duty in connection with the proposed sale of Keynote Systems, Inc. ("Keynote") (KEYN) to an affiliate of Thoma Bravo, LLC in an all-cash transaction valued at approximately $395 million or $20.00 per share.

Lifshitz Law Firm's investigation is focused on whether the proposed deal provides adequate value to Keynote's shareholders.

For more information about our investigation, please contact Joshua M. Lifshitz, Esq. by telephone at (212) 213-6222 Ext. 18 or by sending an e-mail including your contact information to: info@jlclasslaw.com.

sTec, Inc.

Lifshitz Law Firm announces an investigation into possible breaches of fiduciary duty in connection with the proposed sale of sTec, Inc. ("sTec") to Western Digital® Corporation in a transaction valued at approximately $340 million in cash, which equates to $6.85 per share.

Lifshitz Law Firm's investigation is focused on whether the proposed deal provides adequate value to sTec's shareholders.

For more information about our investigation, please contact Joshua M. Lifshitz, Esq. by telephone at (212) 213-6222 Ext. 18 or by sending an e-mail including your contact information to: info@jlclasslaw.com.

Vanguard Health Systems Inc.

Lifshitz Law Firm announces an investigation into possible breaches of fiduciary duty in connection with the proposed sale of Vanguard Health Systems Inc. ("Vanguard") (VHS) to Tenet Healthcare Corporation in a transaction valued at approximately $4.3 billion including the assumption of $2.5 billion in Vanguard debt or $21 per share in cash.

Lifshitz Law Firm's investigation is focused on whether the proposed deal provides adequate value to Vanguard's shareholders.

For more information about our investigation, please contact Joshua M. Lifshitz, Esq. by telephone at (212) 213-6222 Ext. 18 or by sending an e-mail including your contact information to: info@jlclasslaw.com.

Lifshitz Law Firm is a New York based law firm with significant experience representing investors in merger-related shareholder class actions, shareholder derivative actions, and securities fraud class actions.  For more information about the firm, please visit our website at www.jlclasslaw.com.

ATTORNEY ADVERTISING. © 2013 Lifshitz Law Firm.  The law firm responsible for this advertisement is Lifshitz Law Firm, 18 East 41^st Street, New York, New York 10017, (212) 213-6222.  Prior results do not guarantee or predict a similar outcome with respect to any future matter.

Contact:

Joshua M. Lifshitz, Esq.
Lifshitz Law Firm
Phone:   212-213-6222
Email: info@jlclasslaw.com

SOURCE Lifshitz Law Firm