Explanation of Responses:
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1)
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The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.68 to $47.50, 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 sold at each separate price within the range set forth in footnote (1) to this Form 4.
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2)
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Represents the total number of shares owned by the five Northaven entities combined after giving effect to the reported transaction. A breakdown of the shares owned by each entity is set forth at the bottom of Table I.
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3)
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Each of the five Northaven entities participated in the sales reported on this Form 4. Of the total 162,000 shares sold on November 9, 2015, Northaven Partners, L.P. sold 68,217 shares, Northaven Partners II, L.P. sold 9,278 shares, Northaven Partners III, L.P. sold 4,241 shares, Northaven Offshore Ltd. sold 6,820 shares, and Northaven Capital Partners, L.P. sold 73,444 shares.
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4)
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The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.26 to $46.87, 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 sold at each separate price within the range set forth in footnote (4) to this Form 4.
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5)
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Each of the five Northaven entities participated in the sales reported on this Form 4. Of the total 293,900 shares sold on November 10, 2015, Northaven Partners, L.P. sold 123,760 shares, Northaven Partners II, L.P. sold 16,832 shares, Northaven Partners III, L.P. sold 7,695 shares, Northaven Offshore Ltd. sold 12,372 shares, and Northaven Capital Partners, L.P. sold 133,241 shares.
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6)
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The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.00 to $47.01, 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 sold at each separate price within the range set forth in footnote (6) to this Form 4.
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7)
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Each of the five Northaven entities participated in the sales reported on this Form 4. Of the total 91,900 shares sold on November 11, 2015, Northaven Partners, L.P. sold 38,699 shares, Northaven Partners II, L.P. sold 5,263 shares, Northaven Partners III, L.P. sold 2,406 shares, Northaven Offshore Ltd. sold 3,869 shares, and Northaven Capital Partners, L.P. sold 41,663 shares.
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8)
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Represents the total number of shares held by each respective Northaven entity after giving effect to the reported transactions.
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9)
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Reporting person serves as a shareholder in Northaven Management, Inc., and is a member of Northaven Associates, LLC, the general partner of each of Northaven Partners, L.P., Northaven Partners II, L.P., Northaven Partners III, L.P., and Northaven Capital Partners, L.P., and the holder of the management shares of Northaven Offshore Ltd. As such, reporting person may be deemed to have beneficial ownership of the securities owned by these entities. Reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that he is a beneficial owner of such securities for the purposes of Section 16.
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