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UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

The following unaudited pro forma condensed combined financial information and the accompanying notes (the “pro forma financial information”) are presented to illustrate the effects of the accounting for the mergers.

The accompanying unaudited pro forma condensed combined balance sheet as of June 30, 2025 combines the historical consolidated balance sheets of Columbia Banking System, Inc. (“Columbia”) and Pacific Premier Bancorp, Inc. (Pacific Premier”) as of such date and reflects adjustments that depict the accounting for the mergers required by GAAP (the “pro forma balance sheet transaction accounting adjustments”). Also, the unaudited pro forma condensed combined statements of income for the six months ended June 30, 2025 and for the year ended December 31, 2024 combine the historical consolidated statements of income of Columbia and Pacific Premier for the same periods and reflects adjustments that depict the effects of the pro forma balance sheet transaction accounting adjustments assuming those adjustments were made on January 1, 2024 (the “pro forma income statement transaction accounting adjustments”). We refer to pro forma balance sheet transaction accounting adjustments and pro forma statements of income transaction accounting adjustments collectively as the “transaction accounting adjustments.”

The unaudited pro forma financial information is based on and should be read in conjunction with the separate historical financial statements and notes thereto included in each of Columbia’s and Pacific Premier’s SEC filings incorporated by reference into this joint proxy statement/prospectus, including:

•the historical audited consolidated financial statements of Columbia and accompanying notes included in Columbia’s Annual Report on Form 10-K for the year ended December 31, 2024;

•the historical unaudited condensed consolidated financial statements of Columbia and accompanying notes included in Columbia’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2025;

•the historical audited consolidated financial statements of Pacific Premier and accompanying notes included in Pacific Premier's Annual Report on Form 10-K for the year ended December 31, 2024; and

•the historical unaudited consolidated financial statements of Pacific Premier and accompanying notes included in Pacific Premier's Quarterly Report on Form 10-Q for the quarter ended June 30, 2025.

The unaudited pro forma financial information is provided for illustrative information purposes only. The unaudited pro forma financial information is not necessarily, and should not be assumed to be, an indication of the actual results that would have been achieved had the acquisition been completed as of the dates indicated or that may be achieved in the future.

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UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

The unaudited pro forma condensed combined balance sheet as of June 30, 2025, reflects adjustments that depict the accounting for the mergers required by GAAP.

			June 30, 2025
(dollars in thousands)			Columbia Historical						Pacific Premier Historical																		Pro Forma Adjustments						Notes						Pro Forma Combined
ASSETS
Cash and due from banks			$	608,057					$	166,647																	$	—											$	774,704
Interest bearing cash and temporary investments			1,334,113						625,743																		(185,000)						A						1,774,856
Total cash and cash equivalents			1,942,170						792,390																		(185,000)												2,549,560
Investment securities
Equity and other, at fair value			92,958						—																		—												92,958
Available for sale, at fair value			8,653,172						1,581,731																		—												10,234,903
Held to maturity, at amortized cost			2,013						1,687,871																		(310,000)						B						1,379,884
Loans held for sale, at fair value			65,590						751																		—												66,341
Loans and leases			37,637,013						11,902,079																		(472,000)						C						49,067,092
Allowance for credit losses on loans and leases			(420,907)						(170,663)																		74,663						D						(516,907)
Net loans and leases			37,216,106						11,731,416																		(397,337)												48,550,185
Restricted equity securities			161,380						97,717																		—												259,097
Premises and equipment, net			356,879						45,666																		12,000						E						414,545
Goodwill			1,029,234						901,312																		(399,133)						F						1,531,413
Other intangible assets, net			430,443						27,127																		386,632						G						844,202
Bank-owned life insurance			704,919						490,770																		—												1,195,689
Deferred tax asset, net			299,043						93,450																		122,617						H						515,110
Other assets			947,535						332,971																		—												1,280,506
Total assets			$	51,901,442					$	17,783,172																	$	(770,221)											$	68,914,393
LIABILITIES AND SHAREHOLDERS' EQUITY
Deposits
Non-interest bearing			$	13,219,631					$	4,687,795																	$	—											$	17,907,426
Interest bearing			28,523,026						9,809,578																		7,000						I						38,339,604
Total deposits			41,742,657						14,497,373																		7,000												56,247,030
Securities sold under agreements to repurchase			191,435						—																		—												191,435
Borrowings			3,350,000						—																		—												3,350,000
Junior subordinated debentures, at fair value			323,015						—																		—												323,015
Junior and other subordinated debentures, at amortized cost			107,554						124,023																		(1,000)						J						230,577
Other liabilities			844,899						186,358																		—												1,031,257
Total liabilities			46,559,560						14,807,754																		6,000												61,373,314
SHAREHOLDERS' EQUITY
Common stock			5,826,488						2,401,498																		8,126						K						8,236,112
(Accumulated deficit) retained earnings			(150,822)						639,189																		(820,249)						L						(331,882)
Accumulated other comprehensive (loss) income			(333,784)						(65,269)																		65,269						M						(333,784)
Total shareholders' equity			5,341,882						2,975,418																		(746,854)												7,570,446
Total liabilities and shareholders' equity			$	51,901,442					$	17,783,172																	$	(740,854)											$	68,943,760

See accompanying notes to the unaudited pro forma condensed combined financial information.

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UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

The unaudited pro forma condensed combined statement of income for the six months ended June 30, 2025, reflects adjustments that depict the effects of the pro forma balance transaction accounting adjustments assuming those adjustments were made on January 1, 2024.

			Six Months Ended June 30, 2025
(in thousands)			Columbia Historical						Pacific Premier Historical						Reclassification Adjustments (Note 3)						Notes						Pacific Premier As Adjusted						Pro Forma Adjustments						Notes						Pro Forma Combined
INTEREST INCOME
Interest and fees on loans and leases			$	1,116,905					$	298,949					$	—											$	298,949					$	83,028					N						$	1,498,882
Interest and dividends on investment securities			168,816						77,567						(15,929)						1						61,638						23,961						O						254,415
Interest on temporary investments and interest bearing deposits			32,211						—						15,929						1						15,929						—												48,140
Total interest income			1,317,932						376,516						—												376,516						106,989												1,801,437
INTEREST EXPENSE
Interest on deposits			356,788						117,949						—												117,949						—												474,737
Interest on securities sold under agreement to repurchase and federal funds purchased			1,929						—						—												—						—												1,929
Interest on borrowings			70,616						4						—												4						—												70,620
Interest on junior and other subordinated debentures			17,158						8,441						—												8,441						125						Q						25,724
Total interest expense			446,491						126,394						—												126,394						125												573,010
Net interest income			871,441						250,122						—												250,122						106,864												1,228,427
PROVISION (RECAPTURE) FOR CREDIT LOSSES			56,852						(5,796)						—												(5,796)						—												51,056
Net interest income after provision (recapture) for credit losses			814,589						255,918						—												255,918						106,864												1,177,371
NON-INTEREST INCOME
Service charges on deposits			38,970						5,207						—												5,207						—												44,177
Card-based fees			27,130						1,769						—												1,769						—												28,899
Financial services and trust revenue			11,029						19,122						—												19,122						—												30,151
Residential mortgage banking revenue, net			16,677						—						—												—						—												16,677
Other income			37,033						12,932						—												12,932						—												49,965
Total non-interest income			130,839						39,030						—												39,030						—												169,869
NON-INTEREST EXPENSE
Salaries and employee benefits			300,122						106,080						2,357						2						108,437						—												408,559
Occupancy and equipment, net			95,348						18,187						15,521						2						33,708						—												129,056
Intangible amortization			53,805						5,067						—												5,067						28,786						S						87,658
Legal settlement			55,000						—						—												—						—												55,000
Other expenses			113,842						75,334						(17,878)						2						57,456						—												171,298
Total non-interest expense			618,117						204,668						—												204,668						28,786												851,571
Income before provision for income taxes			327,311						90,280						—												90,280						78,078												495,669
Provision for income taxes			88,279						22,198						—												22,198						20,691						U						131,168
Net income			$	239,032					$	68,082					$	—											$	68,082					$	57,387											$	364,501
Earnings per common share:
Basic			$1.14						$0.70																																				$1.22
Diluted			$1.14						$0.70																																				$1.22
Weighted average number of common shares outstanding:
Basic			208,964						94,932																								(6,016)						V						297,880
Diluted			209,965						94,968																								(6,052)						W						298,881

See accompanying notes to the unaudited pro forma condensed combined financial information.

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UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

The unaudited pro forma condensed combined statement of income for the fiscal year ended December 31, 2024, reflects adjustments that depict the effects of the pro forma balance transaction accounting adjustments assuming those adjustments were made on January 1, 2024.

			Year Ended December 31, 2024
(in thousands)			Columbia Historical						Pacific Premier Historical						Reclassification Adjustments (Note 3)						Notes						Pacific Premier As Adjusted						Pro Forma Adjustments						Notes						Pro Forma Combined
INTEREST INCOME
Interest and fees on loans and leases			$	2,320,364					$	655,206					$	—											$	655,206					$	208,155					N						$	3,183,725
Interest and dividends on investment securities			344,649						167,362						(52,650)						1						114,712						50,467						O						509,828
Interest on temporary investments and interest bearing deposits			90,227						—						52,650						1						52,650						—												142,877
Total interest income			2,755,240						822,568						—												822,568						258,622												3,836,430
INTEREST EXPENSE
Interest on deposits			802,806						257,988						—												257,988						(7,000)						P						1,053,794
Interest on securities sold under agreement to repurchase and federal funds purchased			4,873						—						—												—						—												4,873
Interest on borrowings			190,241						8,083						—												8,083						—												198,324
Interest on junior and other subordinated debentures			38,918						19,546						—												19,546						250						Q						58,714
Total interest expense			1,036,838						285,617						—												285,617						(6,750)												1,315,705
Net interest income			1,718,402						536,951						—												536,951						265,372												2,520,725
PROVISION FOR CREDIT LOSSES			105,924						4,789						—												4,789						48,000						R						158,713
Net interest income after provision for credit losses			1,612,478						532,162						—												532,162						217,372												2,362,012
NON-INTEREST INCOME
Service charges on deposits			71,517						10,875						—												10,875						—												82,392
Card-based fees			57,089						3,452						—												3,452						—												60,541
Financial services and trust revenue			20,208						37,119						—												37,119						—												57,327
Residential mortgage banking revenue, net			24,108						—						—												—						—												24,108
Other income			38,044						31,392						—												31,392						—												69,436
Total non-interest income			210,966						82,838						—												82,838						—												293,804
NON-INTEREST EXPENSE
Salaries and employee benefits			588,830						211,057						4,960						2						216,017						—												804,847
Occupancy and equipment, net			182,372						42,380						29,669						2						72,049						—												254,421
Intangible amortization			119,431						11,091						—												11,091						64,138						S						194,660
Other expenses			214,061						138,003						(34,629)						2						103,374						185,000						T						502,435
Total non-interest expense			1,104,694						402,531						—												402,531						249,138												1,756,363
Income before provision for income taxes			718,750						212,469						—												212,469						(31,766)												899,453
Provision for income taxes			185,075						53,667						—												53,667						(8,418)						U						230,324
Net income			$	533,675					$	158,802					$	—											$	158,802					$	(23,348)											$	669,129
Earnings per common share:
Basic			$2.56						$1.65																																				$2.25
Diluted			$2.55						$1.65																																				$2.24
Weighted average number of common shares outstanding:
Basic			208,463						94,579																								(5,663)						V						297,379
Diluted			209,337						94,683																								(5,767)						W						298,253

See accompanying notes to the unaudited pro forma condensed combined financial information.

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NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Note 1—Basis of Presentation

The unaudited pro forma financial information and explanatory notes have been prepared in accordance with Article 11 of Regulation S-X to illustrate the effects of the mergers under the acquisition method of accounting in Accounting Codification Standards 805, Business Combinations (ASC 805) with Columbia treated as the accounting acquirer. Under the acquisition method of accounting, the assets and liabilities of Pacific Premier (as the accounting acquiree) will be recorded mostly at their respective fair values, as of the effective date of the mergers, and the excess of the fair value of Pacific Premier's net assets over the consideration transferred will be recorded as goodwill. In addition, merger-related costs incurred by Columbia, the accounting acquirer, are accounted for as expenses in the periods in which the costs are incurred and the services received.

As discussed in Note 3, certain reclassifications were made to align Pacific Premier’s historical financial statement presentation with that of Columbia. The accounting policies of both Columbia and Pacific Premier are currently under review, and Columbia and Pacific Premier have not identified all adjustments necessary to conform the respective accounting policies into a single accounting policy. As a result of that review, differences could be identified between the accounting policies of the two companies that, when aligned, could have a material impact on the Columbia’s financial information.

The transaction accounting adjustments are preliminary and are subject to change as additional information becomes available and as additional analysis is performed. The preliminary transaction accounting adjustments have been made solely for the purpose of providing the unaudited pro forma financial information. The transaction accounting adjustments are based upon available information and certain assumptions considered reasonable, and may be revised as additional information becomes available.

Note 2—Preliminary Consideration Transferred and Allocation of Consideration Transferred

The transaction accounting adjustments depict the accounting for the mergers, including the determination of the fair value of preliminary consideration transferred and allocation of the preliminary consideration transferred to assets acquired and liabilities assumed. The excess of the consideration transferred over the fair value of assets acquired and liabilities assumed is reflected as goodwill.

Refer to the table below for the preliminary calculation of estimated merger consideration transferred:

(dollars and shares in thousands)
Share consideration:						Amount
Shares of Pacific Premier common stock outstanding as of August 29, 2025						97,126
Shares of Pacific Premier restricted stock units and dividend equivalents outstanding as of August 29, 2025						49
Total Pacific Premier shares outstanding plus restricted stock units						97,175
Exchange ratio						0.9150
Number of shares of Columbia common stock to be issued to Pacific Premier shareholders						88,915
Columbia’s market price per common share as of August 29, 2025						$	26.77
Preliminary fair value of estimated merger consideration transferred						$	2,380,257

The final consideration transferred is based upon the completion of the mergers were determined based on the closing price of Columbia common stock on the closing date and the number of issued and outstanding shares of Pacific Premier common stock immediately prior to the effective time. Final consideration transferred may differ from the amounts reflected in the unaudited pro forma financial information, and the differences may be material.

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Columbia estimated the fair value of certain Pacific Premier assets and liabilities based on a preliminary valuation analysis, due diligence information, information presented in Pacific Premier’s SEC filings and other publicly available information. As of the date of this Current Report on Form 8-K, Columbia has not completed the valuation analysis and calculations in sufficient detail necessary to arrive at the required estimates of the fair value of Pacific Premier’s assets acquired or liabilities assumed for accounting purposes, other than a preliminary estimate for intangible assets and certain financial assets and financial liabilities. Accordingly, apart from the aforementioned, certain Pacific Premier assets and liabilities are presented at their respective carrying amounts and should be treated as preliminary fair values. A final determination of the fair value of Pacific Premier’s assets and liabilities will be based on Pacific Premier’s actual assets and liabilities as of the effective time. Actual adjustments may differ from the amounts reflected in the unaudited pro forma financial information, and the differences may be material.

A final determination of the fair value of Pacific Premier’s assets acquired and liabilities assumed will be performed. Any changes in the fair values of the net assets or total purchase price as compared with the information shown in the unaudited pro forma financial information may change the amount of the total purchase price allocated to goodwill and other assets and liabilities and may impact the combined company’s statement of income. The final purchase price allocation may be materially different than the preliminary purchase price allocation presented in the unaudited pro forma financial information.

The following table sets forth a preliminary allocation of the estimated merger consideration transferred to the fair value of the identified tangible and intangible assets and liabilities assumed of Pacific Premier using Pacific Premier's unaudited consolidated balance sheet as of June 30, 2025:

(in thousands)						June 30, 2025
Fair value consideration paid to Pacific Premier shareholders
			Cash paid									$	—
			Fair value of common shares issued and exchanged									2,380,257
			Preliminary fair value of estimated merger consideration transferred									$	2,380,257
Fair value of assets acquired:
			Cash and due from banks			$	792,390
			Available for sale			1,581,731
			Held to maturity			1,377,871
			Loans and leases			11,382,079
			Restricted equity securities			97,717
			Premises and equipment			57,666
			Other intangible assets			413,759
			Bank-owned life insurance			490,770
			Deferred tax asset, net			164,127
			Other assets			332,971
			Total assets acquired			$	16,691,832
Fair value of liabilities assumed:
			Deposits			$	14,504,373
			Junior and other subordinated debentures			123,023
			Other liabilities			186,358
			Total liabilities assumed			$	14,813,754
Net assets acquired												$	1,878,078
Preliminary pro forma goodwill												$	502,179

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Note 3—Effect of Reclassification Adjustments

During the preparation of the unaudited pro forma financial information, Columbia performed certain procedures to identify transaction accounting adjustments to be made as a result of material differences in the financial statement presentation of Columbia and Pacific Premier. Certain reclassification adjustments have been made to conform Pacific Premier’s historical financial statement presentation to Columbia’s historical financial statement presentation. Reclassifications have also been made to condense historical Columbia’s amounts reported. Columbia has not identified all adjustments necessary to conform Pacific Premier’s accounting policies to Columbia’s accounting policies. Although the merger has closed, Columbia is in the process of performing a more detailed review. As a result of that review, differences could be identified between the accounting policies of the two companies that, when conformed, could have a material impact on the combined company’s financial information.

The table below represents a summary of reclassification adjustments made to conform the presentation of Pacific Premier’s income statement for the six months ended June 30, 2025 and the year ended December 31, 2024 to that of Columbia:

Income Statement (dollars in thousands)												June 30, 2025						December 31, 2024
1						Adjustment to interest income
						Interest and dividends on investment securities						$	(15,929)					$	(52,650)
						Interest on temporary investments and interest bearing deposits						15,929						52,650
						Reclassified Pacific Premier's interest on temporary investments and interest-bearing deposits to interest and dividends on investment securities to align with Columbia's financial presentation.
2						Adjustments to non-interest expense line items
						Salaries and employee benefits						$	2,357					$	4,960
						Occupancy and equipment, net						15,521						29,669
						Other expenses						(17,878)						(34,629)
						Reclassified benefit related expenses and software-related costs from other expenses to salaries and employee benefits, and occupancy and equipment, net, respectively, to align with Columbia's financial presentation.

Note 4—Transaction Accounting Adjustments

The following transaction accounting adjustments have been reflected in the unaudited pro forma financial information. All adjustments are based on current assumptions and valuations, which are subject to change.

Balance Sheet (dollars in thousands)

June 30, 2025

A

Adjustment to cash and cash equivalents

To reflect cash paid for merger-related expenses.

$

(185,000)

Merger-related expenses of $115 million are expected to be incurred for change in control agreements, retention, investment banker fees, legal fees and accounting fees. Additionally, other accounting and audit related costs, contract and lease terminations, marketing, and other expenses in connection with the merger, of $70 million are reflected in the unaudited pro forma combined condensed balance sheet.

B

Adjustment to investment securities, held to maturity

To reflect estimated fair value of acquired investment securities.

$

(310,000)

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Balance Sheet (dollars in thousands)												June 30, 2025
C						Adjustments to loans and leases
						To reverse existing fair value mark on Pacific Premier acquired loans.						$	25,000
						To reflect estimated fair value related to current interest rates and liquidity on acquired loans and leases.						(449,000)
						To reflect estimated lifetime credit losses on acquired loans and leases.						(96,000)
						Net fair value pro forma adjustments						(520,000)
						Gross up of purchase credit deteriorated ("PCD") loans and leases for credit mark.						48,000
												$	(472,000)
D						Adjustments to allowance for credit losses on loans and leases
						To eliminate Pacific Premier allowance for credit losses on loans and leases at closing date as the credit risk is contemplated in the fair value adjustments.						$	170,663
						To reflect estimated lifetime credit losses on acquired PCD loans and leases.						(48,000)
						To reflect estimated lifetime credit losses on acquired non-PCD loans and leases.						(48,000)
												$	74,663
E						Adjustment to premises and equipment, net
						To reflect estimated fair value of acquired premises and equipment.						$	12,000
F						Adjustments to goodwill
						To eliminate Pacific Premier goodwill at closing date.						$	(901,312)
						To record the goodwill associated with the mergers. See Note 2.						502,179
												$	(399,133)
G						Adjustments to other intangible assets, net
						To eliminate Pacific Premier other intangible assets, net.						$	(27,127)
						To record the estimated fair value of acquired identifiable core deposit intangible assets, calculated as 3.3% of Pacific Premier core deposits.						413,759
												$	386,632
H						Adjustments to deferred tax asset, net
						To reflect deferred tax asset created in the mergers, which is calculated as follows:
						Adjustment to investment securities, held to maturity						(310,000)
						Adjustments to loans and leases, net						(349,337)
						Adjustment to premises and equipment, net						12,000
						Adjustments to other intangible assets, net						386,632
						Adjustment to deposits						(7,000)
						Adjustment to junior and other subordinated debentures, at amortized cost						1,000
						Subtotal for fair value adjustments						(266,705)
						Calculated deferred tax asset at estimated combined statutory federal and state income tax rate of 26.5%						70,677
						To reflect deferred tax asset created on provision for credit losses on Pacific Premier's non-PCD loans.						12,720
						To reflect change in taxes receivable due to deductible portion of merger expenses.						39,220
												$	122,617
I						Adjustment to deposits
						To reflect estimated fair value based on current market rates for similar products.						$	7,000

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Balance Sheet (dollars in thousands)												June 30, 2025
J						Adjustment to junior and other subordinated debentures, at amortized cost
						To reflect estimated fair value at closing date based on current market rates and spreads for similar subordinated debentures.						$	(1,000)
K						Adjustments to common stock
						To eliminate historical Pacific Premier common stock.						$	(2,401,498)
						To reflect the closing-date fair value of the consideration transferred by Columbia for its interest in Pacific Premier. See Note 2.						2,409,624
												$	8,126
L						Adjustments to accumulated deficit/retained earnings
						To eliminate historical Pacific Premier retained earnings.						$	(639,189)
						To adjust for estimated lifetime credit losses on acquired non-PCD loans and leases on an after tax basis.						(35,280)
						To adjust for after tax merger expenses.						(145,780)
												$	(820,249)
M						Adjustment to accumulated other comprehensive income
						To eliminate historical Pacific Premier accumulated other comprehensive income.						$	65,269

Income Statement (dollars and shares in thousands)												Six Months Ended June 30, 2025						Year Ended December 31, 2024
N						Adjustment to interest and fees on loans and leases
						To reflect accretion of loan rate premium and non-PCD credit discount resulting from loans and leases fair value using sum of years digits method to approximate effective yield method over the estimated lives of the acquired loan portfolio, which is approximately 4.2 years.						$	83,028					$	208,155
O						Adjustment to interest and dividends on investment securities
						To reflect estimated accretion of the discount on acquired investment securities fair value using sum of years digits method to approximate effective yield method over the estimated lives of the acquired investment securities portfolios, which is approximately 15.4 years.						$	23,961					$	50,467
P						Adjustment to interest on deposits
						To reflect amortization of deposit discount resulting from deposit fair value based on weighted average life of time deposits being approximately one year.						$	—					$	(7,000)
Q						Adjustment to interest on junior and other subordinated debentures
						To reflect accretion of subordinated debenture premium resulting from subordinated debenture fair value based on the life of subordinated debenture of approximately four years.						$	125					$	250
R						Adjustment to provision for credit losses
						To record provision for credit losses on Pacific Premier's non-purchase credit deteriorated loans.						$	—					$	48,000

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Income Statement (dollars and shares in thousands)												Six Months Ended June 30, 2025						Year Ended December 31, 2024
S						Adjustments to intangible amortization
						To remove Pacific Premier intangible assets amortization						$	(5,067)					$	(11,091)
						To reflect amortization of acquired intangible assets fair value based on amortization period of 10 years and using the sum-of-the-years-digits method of amortization.						33,853						75,229
												$	28,786					$	64,138
T						Adjustment to other expenses
						To reflect the pre-tax nonrecurring merger-related costs expected to be incurred as a result of the acquisition and assuming such costs are incurred after closing of the acquisition.						$	—					$	185,000
U						Adjustment to income tax provision
						To reflect the income tax effect of pro forma adjustments at the estimated combined statutory federal and state income tax rate of 26.5%.						$	20,691					$	(8,418)
V						Adjustments to weighted average number of common shares outstanding - Basic
						To reflect acquisition of Pacific Premier basic common shares.						(94,932)						(94,579)
						To reflect the par value of 88,916 shares of Columbia common stock to be issued in the mergers.						88,916						88,916
												(6,016)						(5,663)
W						Adjustments to weighted average number of common shares outstanding - Diluted
						To reflect acquisition of Pacific Premier diluted common shares.						(94,968)						(94,683)
						To reflect issuance of 88,916 shares of Columbia common stock in connection with the mergers. See Note 2.						88,916						88,916
												(6,052)						(5,767)

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