X0306 4 2020-02-28 0 0001102112 PACWEST BANCORP PACW 0001179862 BLAKE CHRISTOPHER D 9701 WILSHIRE BOULEVARD, SUITE 700 BEVERLY HILLS CA 90212 0 1 0 0 Pres. & CEO, Community Banking Common Stock 2020-02-28 4 F 0 2595 31.64 D 48145 D Common Stock 2020-02-28 4 F 0 2659 31.64 D 45486 D Common Stock 2020-03-02 4 P 0 4740 31.6959 A 30813 I By Family Trust Common Stock 281 I By IRA Common Stock 222 I By Spouse's IRA Represents the number of shares of Issuer's common stock that Reporting Person surrendered to Issuer for the satisfaction of Reporting Person's tax withholding obligations upon the vesting of 5,366 shares of restricted stock on February 28, 2020. Reflects market closing price on February 28, 2020. On February 15, 2017, Reporting Person was granted performance restricted stock units ("PRSUs"). Vesting of the PRSUs was conditioned upon the achievement of certain performance goals and an employment condition. On February 12, 2020, actual performance against goals for the applicable performance period was determined and the Reporting Person was awarded 5,526 shares of Issuer's common stock to vest on February 28, 2020 subject to the Reporting Person's satisfaction of the employment condition. The amount reported in column 4 represents the number of shares of Issuer's common stock that Reporting Person surrendered to Issuer for the satisfaction of Reporting Person's tax withholding obligations upon the vesting of the 5,526 shares of Issuer's common stock on February 28, 2020. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $31.67 to $31.70, inclusive. The Reporting Person undertakes to provide to PacWest Bancorp, any security holder of PacWest Bancorp, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote (4) to this Form 4. /s/ Christopher Blake 2020-03-03