Rigrodsky & Long, P.A. announces that it has filed a class action lawsuit in the United States District Court for the Northern District of California on behalf of all persons or entities who purchased or otherwise acquired the common stock of Pacific Biosciences of California, Inc. (“PacBio” or the “Company”) (Nasdaq: PACB) between October 27, 2010, and September 20, 2011, inclusive (the “Class Period”) alleging violations of the Securities Exchange Act of 1934 (the “Complaint”). The case is entitled Primo v. Pacific Biosciences of California, Inc., Case No. C-11-6599-CW (N.D. Cal.). If you wish to view a copy of the Complaint, discuss this action, or have any questions concerning this notice or your rights or interests, please contact Timothy J. MacFall, Esquire or Noah R. Wortman, Case Development Director of Rigrodsky & Long, P.A., 919 North Market Street, Suite 980 Wilmington, Delaware, 19801 at (888) 969-4242, by e-mail to firstname.lastname@example.org, or at: http://www.rigrodskylong.com/news/pacific-biosciences-of-ca-pacb. PACB is a development stage company that develops, manufactures, and markets an integrated platform for genetic analysis. The Company engages in commercializing a platform, single molecule, real-time technology (SMRT) for the detection of biological events. The Complaint asserts that, during the Class Period, defendants failed to disclose material adverse facts regarding the Company’s overall operational and financial condition that were caused by significant problems with its third generation human genome sequencing technology. Defendants’ failure to disclose these problems rendered their statements concerning the Company’s financial condition and future prospects materially false and misleading which, in turn, artificially inflated the price of PacBio common stock during the Class Period. On August 5, 2010, JP Morgan downgraded its rating of PacBio due to a significantly lower projection of orders in 2012. It projected that PacBio would not become profitable until 2015, and it lowered its target price for PacBio shares down to $10. That day, August 5, 2011, shares of PacBio closed at $6.50, a decline of $3.40, or over 34%, on trading volume that was over two times greater than the previous day’s. The next trading day, August 8, 2011, PacBio closed at $5.60, a decline of an additional $0.90, again on very heavy trading volume. In two trading days, PacBio stock lost $4.30, or over 43% of its value.