X0306 4 2020-03-12 0 0001102112 PACWEST BANCORP PACW 0001179841 STINE ROBERT A 9701 WILSHIRE BOULEVARD, SUITE 700 BEVERLY HILLS CA 90212 1 0 0 0 Common Stock 2020-03-12 4 P 0 9200 21.5531 A 31635 I By Stine Family Trust The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $21.553 to $21.555, 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 (1) to this Form 4. Includes 1,510 shares previously reported as directly held. /s/ Robert A. Stine 2020-03-16