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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Common Stock , par value $ 0.01 ( Title of Each Class ) Delaware ( State or other jurisdiction of incorporation or organization ) ✔ Large accelerated filer ☐ or For the fiscal year ended December 31 , 2020 Commission File No. 001-36408 PACWEST BANCORP ( Exact name of registrant as specified in its charter ) per 9701 Wilshire Blvd. , Suite 700 Beverly Hills , CA 90212 ( Address of Principal Executive Offices , Including Zip Code ) ( 310 ) 887-8500 ( Registrant's Telephone Number , Including Area Code ) Securities registered pursuant to Section 12 ( b ) of the Act : share PACW ( Trading Symbol ) ( I.R.S. Employer Identification No. ) 33-0885320 Securities Registered Pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . p Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . o Yes þ No o No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . o Yes p No The Nasdaq Stock Market , LLC ( Name of Exchange on Which Registered ) Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . p Yes o No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . ( Check one ) : Accelerated filer Smaller reporting company 0 Emerging growth company ■ If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . 1 ■ Non - accelerated filer Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . þ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes p No As of June 30 , 2020 , the aggregate market value of the voting common stock held by non - affiliates of the registrant , computed by reference to the average high and low sales prices on The Nasdaq Global Select Market as of the close of business on June 30 , 2020 , was approximately $ 2.2 billion . Registrant does not have any nonvoting common equities . As of February 17 , 2021 , there were 116,807,199 shares of registrant's common stock outstanding , excluding 2,369,758 shares of unvested restricted stock . DOCUMENTS INCORPORATED BY REFERENCE The information required by Items 10 , 11 , 12 , 13 and 14 of Part III of this Annual Report on Form 10 - K will be found in the Company's definitive proxy statement for its 2021 Annual Meeting of Stockholders , to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934 , as amended , and such information is incorporated herein by this reference .