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United Security adds merger disclosure details

United Security Bancshares filed an 8-K describing supplemental disclosures for its pending merger with Community West Bancshares.

Filing Impact
(High)
Filing Sentiment
(Neutral)
Form Type
8-K

Rhea-AI Filing Summary

United Security Bancshares filed an 8-K describing supplemental disclosures for its pending merger with Community West Bancshares. The S-4 registration statement for the stock-for-stock merger is effective, and both companies plan special shareholder meetings on March 30, 2026 to vote on the transaction.

The filing notes two New York lawsuits and several shareholder demand letters alleging disclosure deficiencies in the joint proxy statement/prospectus. While both companies state they believe these claims lack merit, they are voluntarily adding detail on merger background, board considerations, valuation work, comparable company and transaction analyses, and discount-rate assumptions to reduce litigation risk and avoid delays.

Updated materials include a relative contribution table showing pro forma ownership of 71% for Community West and 29% for United Security based on a 0.4520x exchange ratio, plus projected earnings per share accretion of 10.2%–19.1% from 2026–2029 and initial tangible book value dilution that narrows over time.

Positive

  • None.

Negative

  • None.
Item 8.01 Other Events Other
Voluntary disclosure of events the company deems important to shareholders but not covered by other items.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What merger does United Security Bancshares (UBFO) discuss in this 8-K?
United Security Bancshares describes its planned merger into Community West Bancshares. United Security will merge with and into Community West, with Community West as the surviving corporation and United Security Bank combining with Community West Bank immediately afterward.

What shareholder meetings are planned for the UBFO and Community West merger?
Both companies plan special shareholder meetings on March 30, 2026. United Security Bancshares and Community West Bancshares will ask shareholders to vote on adopting the merger agreement and approving Community West’s stock issuance, as detailed in the joint proxy statement/prospectus.

How are United Security Bancshares and Community West responding to the disclosure challenges?
The companies are voluntarily supplementing the joint proxy statement/prospectus. Without admitting any wrongdoing, they provide extra detail on the merger background, board considerations, valuation methods, peer and transaction comparisons, and discount-rate assumptions used by their financial advisors.

What is the pro forma ownership split in the UBFO and Community West merger?
The supplemental disclosures show pro forma ownership of 71% for Community West and 29% for United Security. This split is based on a 0.4520x exchange ratio and forms part of a broader relative contribution analysis for assets, earnings, and capital.

What does the filing say about expected EPS accretion and TBV dilution from the merger?
The pro forma analysis indicates EPS accretion and near-term TBV dilution for Community West. Estimated earnings per share accretion ranges from 10.2% to 19.1% for 2026–2029, while tangible book value per share initially declines before improving over time.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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false000113754700011375472026-03-202026-03-20

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT PURSUANT
TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934

March 20, 2026
Date of Report (Date of earliest event reported)

UNITED SECURITY BANCSHARES
(Exact Name of Registrant as Specified in its Charter)

California
(State or Other Jurisdiction of Incorporation)
000-32987 91-2112732
(Commission File Number) (I.R.S. Employer Identification No.)
   
2126 Inyo Street, Fresno, California
 93721
(Address of principal executive offices) (Zip Code)
559-490-6261
(Registrant’s Telephone Number, Including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☒ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:
Title of each class
Trading Symbol(s)
Name of each exchange on which registered
Common Stock, no par value
UBFO
NASDAQ
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).
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. ☐ 




Item 8.01 Other Events

As previously disclosed, on December 16, 2025, Community West Bancshares, a California corporation (the “Company”) entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and between the Company and United Security Bancshares, a California corporation (“USB”). Pursuant to the terms of the Merger Agreement, and subject to the satisfaction or waiver of the conditions specified therein, USB would merge with and into the Company, with the Company continuing as the surviving corporation (the “Merger”). United Security Bank, USB’s wholly owned banking subsidiary, will be merged with and into Community West Bank, immediately following the completion of the Merger.

On February 4, 2026, the Company filed a registration statement on Form S-4 (the “Registration Statement”) with the SEC, which includes a prospectus with respect to the shares of the Company’s common stock to be issued in the Merger and a joint proxy statement for the Company’s and USB’s respective shareholders. The Registration Statement was declared effective on February 24, 2026, the Company filed a final prospectus on February 24, 2026, and USB filed a definitive proxy statement on February 25, 2026 (together, the “Joint Proxy Statement/Prospectus”). The Company and USB commenced mailing the Joint Proxy Statement/Prospectus to their respective shareholders on or about February 27, 2026. Each of the Company and USB will hold a special meeting of its shareholders on March 30, 2026, in connection with the transactions contemplated by the Merger Agreement as further described in the Joint Proxy Statement/Prospectus.

Litigation Related to the Merger

Following the announcement of the Merger, as of the date of this Current Report on Form 8-K, two lawsuits challenging the Merger have been filed in New York Supreme Court (each, a “Lawsuit” and, together, the “Lawsuits”). The first Lawsuit, captioned Johnson v. United Security Bancshares et al. (No. 651353 / 2026) was filed on March 4, 2026. The second Lawsuit, captioned Thompson v. United Security Bancshares et al. (No. 651360 / 2026) was filed on March 5, 2026. In addition, USB has received demand letters from certain purported shareholders of USB that allege deficiencies or omissions in the Registration Statement (collectively, the “Demand Letters” and together with the Lawsuits, the “Matters”). The Matters each allege that, among other things, the Joint Proxy Statement/Prospectus contains certain disclosure deficiencies or incomplete information regarding the Merger and seek additional disclosures to remedy these purported deficiencies. The Company and USB believe that the allegations in the Matters are without merit. There can be no assurances that additional lawsuits or demands will not be filed or made against the Company or USB with respect to the Merger. If this occurs, neither the Company nor USB will necessarily announce them.

The Company and USB believe that the disclosures set forth in the Joint Proxy Statement/Prospectus comply with applicable law and exchange rules and that no further disclosure beyond that already contained in the Joint Proxy Statement/Prospectus is required under applicable law or exchange rules. However, in order to moot such disclosure claims, to avoid nuisance, cost and distraction, and to preclude any efforts to delay the completion of the Merger, and without admitting any culpability, liability or wrongdoing and without admitting the relevance or materiality of such disclosures, the Company and USB are voluntarily supplementing the Joint Proxy Statement/Prospectus with the disclosures set forth below (the “Supplemental Disclosures”). Nothing in the Supplemental Disclosures shall be deemed an admission of the legal necessity or materiality under applicable laws of any of the disclosures set forth herein. To the contrary, the Company and USB specifically deny all allegations in the Matters, including that any additional disclosure was or is required.
2

Supplemental Disclosures to the Joint Proxy Statement/Prospectus

The Supplemental Disclosures should be read in connection with the Joint Proxy Statement/Prospectus, which should be read in its entirety, including all risk factors and cautionary notes contained therein. All page references are to pages in the Joint Proxy Statement/Prospectus, and terms used below, unless otherwise defined, have the meanings set forth in the Joint Proxy Statement/Prospectus.

1.The Section of the Joint Proxy Statement/Prospectus entitled “Background of the merger” beginning on page 35 is hereby amended by adding the following as a new last sentence to the first paragraph thereunder:

In connection with discussions regarding potential transactions, USB and its advisors periodically solicited interest from potential buyers or merger candidates over the years; however, no other potential candidate expressed actionable interest.

2.The Section of the Joint Proxy Statement/Prospectus entitled “Background of the merger” beginning on page 35 is hereby amended by adding the following as new additional third and fourth sentence to the paragraph beginning with “On October 7, 2025…” on page 37:

Among other things, the USB Board was aware of and strongly believed that the continuity of director positions and Mr. Woods’ continued employment would be integral to the success of the combined company and, ultimately, in the best interests of USB shareholders. The USB Board viewed this potential transaction as a continued investment in the proposed combined company, and the roles offered to Messrs. Woods and Gill by CWB aligned with those beliefs.

3.The Section of the Joint Proxy Statement/Prospectus entitled “Relative Contribution Analysis” beginning on page 43 is hereby amended by deleting the table appearing in such Section and replacing it with the following table:
 Community WestUnited Security
 ($M) As a % of
Combined
Company		($M) As a % of
Combined
Company
Balance Sheet (Projected at close)
   
Total Assets
 $3,687  75%$1,264  25%
Total Loans
 $2,546  72%$987  28%
Total Deposits
 $3,125  74%$1,100  26%
Tangible Common Equity
 $318  70%$137  30%
Profitability
LTM Net Income (as of September 30, 2025)
$33.9 75%$11.4 25%
2026 Estimated Earnings
 $44.6  74%$15.6  26%
Market Data
  



  



 



  



Market Capitalization (as of December 15, 2025)
 $463  72%$183  28%
Pro Forma Ownership (Based on 0.4520x Exchange Ratio)
  71% 29%

Source: S&P Capital IQ Pro
Note: Balance sheet figures projected as of June 30, 2026
3

4.The Section of the Joint Proxy Statement/Prospectus entitled “Comparable Company & Market Premium Analysis - USB” beginning on page 43 is hereby amended by adding the following after the table appearing in such Section:

The table below contains additional information reviewed and utilized by Janney in its analysis:
Adjusted Price(1)
TotalMktTang.
AssetsCapBookLTMDiv.LTMLTMTCE /NPAs /
CompanyTicker($M)($M)ValueEPSYieldROAAROAETAAssets
BayCom CorpBCML2,604 333 142.4 %18.2x3.9 %0.89 %7.0 %11.5 %0.48 %
Plumas BancorpPLBC2,229 316 177.3 %13.2x2.6 %1.47 %13.3 %10.1 %0.68 %
Eagle Bancorp Montana, Inc.EBMT2,120 146 124.4 %13.5x3.1 %0.64 %7.7 %7.1 %0.10 %
Timberland Bancorp, Inc.TSBK2,013 294 148.2 %12.7x3.0 %1.50 %11.6 %12.4 %0.23 %
Oak Valley BancorpOVLY1,995 249 161.2 %13.1x2.0 %1.23 %12.7 %9.8 %0.00 %
Riverview Bancorp, Inc.RVSB1,510 111 102.5 %30.3x1.5 %0.31 %2.9 %9.2 %0.05 %
Provident Financial Holdings, Inc.PROV1,231 103 100.2 %21.9x3.5 %0.49 %4.6 %10.4 %0.15 %
Sound Financial Bancorp, Inc.SFBC1,060 114 133.4 %21.0x1.7 %0.64 %6.5 %10.1 %0.39 %
Mean1,845 208 136.2 %18.0x2.7 %0.90 %8.3 %10.1 %0.26 %
Median2,004 197 137.9 %15.9x2.8 %0.77 %7.4 %10.1 %0.19 %
United Security BancsharesUBFO1,236 182 145.3 %17.0x4.6 %0.94 %8.5 %10.8 %1.10 %
Source: S&P Capital IQ Pro
(1) Adjusted for a 24.3% equity control premium, which is the median three-day stock price premium for all bank and thrift M&A deals for the past 10 years for all sizes and geographic areas

4

5.The Section of the Joint Proxy Statement/Prospectus entitled “Comparable Company Analysis - CWB” beginning on page 44 is hereby amended by adding the following after the table appearing in such Section:

The table below contains additional information reviewed and utilized by Janney in its analysis:
Price /
TotalMktTang.
AssetsCapBookLTMDiv.LTMLTMTCE /NPAs /
CompanyTicker($M)($M)ValueEPSYieldROAAROAETAAssets
Preferred BankPFBC7,468 1,236 159.4 %10.1X3.2 %1.82 %16.9 %10.4 %0.94 %
Heritage Financial CorporationHFWA7,012 861 130.4 %15.4X3.8 %0.81 %6.5 %9.8 %0.21 %
Westamerica BancorporationWABC5,914 1,221 151.9 %10.7X3.8 %1.96 %11.5 %14.0 %0.04 %
Heritage Commerce CorpHTBK5,624 738 140.0 %17.2X4.3 %0.78 %6.3 %9.7 %0.06 %
Five Star BancorpFSBC4,642 796 184.6 %13.8X2.1 %1.36 %14.1 %9.3 %0.05 %
California BanCorp.BCAL4,101 639 147.7 %10.2X2.0 %1.57 %12.0 %10.9 %0.38 %
Bank of Marin BancorpBMRC3,869 445 121.8 %45.0X3.6 %0.26 %2.3 %9.7 %NA
Sierra BancorpBSRR3,709 453 138.2 %11.9X2.9 %1.09 %11.2 %9.0 %0.43 %
Mean5,292 799 146.7 %16.8x3.2 %1.21 %10.1 %10.4 %0.30 %
Median5,133 767 143.9 %12.8x3.4 %1.22 %11.4 %9.7 %0.21 %
Community West BancsharesCWBC3,612 456 155.8 %13.4x2.0 %0.95 %9.0 %8.3 %0.20 %

5

6.The Section of the Joint Proxy Statement/Prospectus entitled “Relevant Nationwide Transactions Analysis - USB” beginning on page 45 is hereby amended by adding the following after the table appearing in such Section:

The table below contains additional information reviewed and utilized by Janney in its analysis:
Deal Price/Seller Financial Metrics
DealTang.Prem./1-DayTotal
DateValueBook
LTM)
CoreMarketAssetsNPAs/ TCE /LTM
Annc.Buyer / Seller($M)ValueEPSDepsPrem.($M)AssetsTAROAA
12/8/2025
Home Bancshares, Inc. / Mountain Commerce Bancorp, Inc.
154 107.2 %13.8x1.1 %7.3 %1,803 0.79 %7.9 %0.62 %
11/12/2025Richmond Mutual Bancorp., Inc. / Farmers Bancorp85 112.3 %9.1x2.4 %7.3 %1,102 0.25 %6.9 %0.90 %
10/30/2025
First Mid Bancshares, Inc. / Two Rivers Financial Group, Inc.
93 109.6 %10.6x0.9 %21.6 %1,189 0.94 %7.3 %0.74 %
10/27/2025
Park National Corporation / First Citizens Bancshares, Inc.
317 168.0 %14.7x8.8 %NA2,544 0.99 %6.9 %0.86 %
10/22/2025Third Coast Bancshares, Inc. / Keystone Bancshares, Inc.123 130.1 %15.1x4.6 %NA1,020 0.09 %9.2 %0.88 %
10/22/2025Farmers National Banc Corp. / Middlefield Banc Corp.293 160.1 %13.9x7.3 %26.6 %1,979 1.76 %9.4 %1.11 %
10/20/2025
HBT Financial, Inc. / CNB Bank Shares, Inc.
170 120.0 %10.5x2.4 %15.7 %1,847 0.31 %6.7 %0.90 %
10/1/2025Prosperity Bancshares, Inc. / Southwest Bancshares, Inc.270 153.3 %14.6x4.7 %NA2,354 0.82 %8.7 %0.84 %
9/25/2025
First Merchants Corporation / First Savings Financial Group, Inc.
241 135.0 %10.9x4.3 %21.5 %2,417 0.56 %7.6 %0.89 %
8/19/2025
TowneBank / Dogwood State Bank
491 223.7 %30.8x15.4 %68.3 %2,363 0.65 %9.4 %0.76 %
7/18/2025
Bank First Corporation / Centre 1 Bancorp, Inc.
174 230.8 %28.6x8.3 %NA1,534 0.28 %6.2 %0.51 %
7/1/2025Investar Holding Corporation / Wichita Falls Bancshares, Inc.84 90.9 %14.2x-1.1 %NA1,594 0.39 %9.2 %0.62 %
6/23/2025
First Financial Bancorp. / Westfield Bancorp
324 142.2 %17.4x6.1 %NA2,123 0.11 %10.7 %0.92 %
4/3/2025
TowneBank / Old Point Financial Corporation
202 175.1 %20.2xNA32.4 %1,451 0.16 %8.0 %0.68 %
2/25/2025
Old Second Bancorp, Inc. / Bancorp Financial, Inc.
197 131.1 %38.7x7.4 %NA1,449 0.14 %11.0 %0.50 %
1/10/2025
CNB Financial Corporation / ESSA Bancorp, Inc.
210 96.3 %11.6x-0.4 %10.6 %2,188 0.56 %10.0 %0.78 %
12/17/2024
Northwest Bancshares, Inc. / Penns Woods Bancorp, Inc.
270 139.1 %13.1x5.6 %1.9 %2,259 0.20 %8.3 %0.88 %
9/9/2024
NBT Bancorp Inc. / Evans Bancorp, Inc.
236 132.4 %12.2x3.7 %18.3 %2,257 1.31 %7.8 %0.88 %
7/29/2024German American Bancorp, Inc. / Heartland BancCorp347 212.0 %16.2x15.7 %80.0 %1,920 0.06 %8.1 %1.09 %
7/25/2024ChoiceOne Financial Services, Inc. / Fentura Financial, Inc.180 134.6 %14.5x0.3 %33.9 %1,757 0.56 %7.7 %0.70 %
5/15/2024Alerus Financial Corporation / HMN Financial, Inc.115 106.8 %20.1x0.8 %32.6 %1,151 0.26 %9.4 %0.50 %
75th Percentile
270 160.1 %17.4x7.3 %36.6 %2,257 0.79 %9.4 %0.89 %
Median202 134.6 %14.5x4.5 %21.6 %1,847 0.39 %8.1 %0.84 %
25th Percentile
154 112.3 %12.2x1.0 %11.9 %1,451 0.20 %7.6 %0.68 %
01/11/24Community West Bancshares / United Security Bancshares193 145.3 %17.0x5.9 %3.9 %1,236 1.10 %10.8 %0.94 %

6

7.The Section of the Joint Proxy Statement/Prospectus entitled “Relevant Regional Transactions Analysis - USB” beginning on page 46 is hereby amended by adding the following after the table appearing in such Section:

The table below contains additional information reviewed and utilized by Janney in its analysis:
Deal Price/Seller Financial Metrics
DealTang.Prem./1-DayTotal
DateValueBook
LTM)
CoreMarketAssetsNPAs/ TCE /LTM
Annc.Buyer / Seller($M)ValueEPSDepsPrem.($M)AssetsTAROAA
09/25/25Heritage Financial Corporation / Olympic Bancorp, Inc.177 151.3 %24.4x4.9 %NA1,693 0.01 %8.4 %0.51 %
01/29/25
Plumas Bancorp / Cornerstone Community Bancorp
62 135.0 %NMNA49.5 %658 0.06 %6.5 %-0.12 %
01/13/25
Glacier Bancorp, Inc. / Bank of Idaho Holding Company
246 186.7 %17.3x12.5 %45.8 %1,328 0.16 %9.5 %1.09 %
05/20/24
CBC Bancorp / Bay Community Bancorp
127 169.7 %15.9xNA83.0 %983 0.72 %7.7 %0.77 %
05/20/24West Coast Community Bancorp / 1st Capital Bancorp60 92.7 %17.7x-0.6 %-0.5 %1,015 0.04 %6.4 %0.35 %
03/22/24
Harborstone Credit Union / SaviBank
78 172.9 %39.5x10.9 %NA593 0.16 %7.6 %0.34 %
01/30/24Southern California Bancorp / California BanCorp227 118.1 %10.4x2.9 %12.7 %1,986 0.19 %9.5 %1.09 %
01/11/24
Global Federal Credit Union / First Financial Northwest Bank
231 141.4 %26.4x11.2 %75.3 %1,525 0.08 %9.7 %0.63 %
10/10/23Central Valley Community Bancorp / Community West Bancshares100 87.5 %8.7x-1.4 %-12.3 %1,131 0.09 %10.0 %1.05 %
08/08/23
Glacier Bancorp, Inc. / Community Financial Group, Inc.
81 164.9 %10.7x5.6 %147.6 %754 0.00 %6.5 %0.96 %
75th Percentile
214 168.5 %24.4x11.0 %77.2 %1,476 0.16 %9.5 %1.02 %
Median113 146.4 %17.3x5.3 %47.6 %1,073 0.09 %8.1 %0.70 %
25th Percentile
78 122.3 %10.7x2.0 %9.4 %811 0.05 %6.8 %0.39 %
01/11/24Community West Bancshares / United Security Bancshares193 145.3 %17.0x5.9 %3.9 %1,236 1.10 %10.8 %0.94 %

8.The Section of the Joint Proxy Statement/Prospectus entitled “Discounted Cash Flow Analysis” beginning on page 47 is hereby amended by adding the following to the end of the first paragraph of the Section:

Janney selected price to tangible book value and earnings multiples based on Janney’s professional judgement and experience, as well as a review of the multiples of selected transactions deemed to be comparable to the proposed transaction.

Risk Free Rate
4.17%

10-year Treasury (as of December 15, 2025)
Equity Risk Premium
5.00%

Kroll Historical Equity Risk Premium(1)

9.17%


Industry Beta
1.00

GICS 401010 Information Beta from Kroll(1)
Size Premium
4.47%

Kroll Micro Cap Size Premium(1)
Discount Rate
13.64%


Discount Rate (Rounded)
13.50%


(1) Based upon Kroll Cost of Capital Resources most recently published guidance (as of December 12, 2025)

7

9.The Section of the Joint Proxy Statement/Prospectus entitled “Pro Forma Merger Analysis” beginning on page 48 is hereby amended by adding the following as a new second to last sentence thereof:

For more information about certain of the assumptions used in Janney’s pro forma analysis, see the Investor Presentation filed by CWB as an exhibit to its Current Report on Form 8-K with the SEC on December 17, 2025.

10.The Section of the Joint Proxy Statement/Prospectus entitled “Comparable Company Analyses” beginning on page 57 is hereby amended by deleting the table of company names at the top of page 58 (the “USB Peer Group”) and replacing it with the following:

Financials as of September 30, 2025, unless otherwise notedBalance SheetCapital PositionLTM ProfitabilityValuation as of 12/15/2025
 Price /
Tier 1CoreTang.LTMEst.Est.1 Yr
TotalLoan/NPAs/TCE/Lev.Eff.CoreROABookCore20262027Div.PriceMkt
AssetsDptsAssetsTARatioNIMRatioROAA¹TCE¹ValueEPS¹EPSEPSYield∆Cap
Company NameCity, StTicker($M)(%)(%)(%)(%)(%)(%)(%)(%)(%)(x)(x)(x)(%)(%)($M)
Unity Bancorp, Inc. Clinton, NJ UNTY 2,876 108 0.59 11.6 12.7 4.46 42 1.99 16.9 170 11.1 10.0 9.3 1.1 20.2 565 
C&F Financial Corporation Toano, VA CFFI 2,711 87 0.17 8.5 10.0 4.20 68 0.98 12.3 108 9.6 - - 2.4 (3.2)245 
Orange County Bancorp, Inc. Middletown, NY OBT 2,636 85 0.46 10.0 12.3 ² 4.01 59 1.27 15.6 148 10.8 9.3 8.2 2.5 (1.1)391 
Plumas Bancorp Reno, NV PLBC 2,229 82 0.68 10.1 10.6 ² 4.88 51 1.56 14.7 144 10.2 8.6 8.2 2.6 (5.8)320 
Northeast Community Bancorp, Inc. White Plains, NY NECB 2,056 124 0.03 16.7 16.1 ² 5.28 39 2.20 13.3 96 7.3 7.0 - 3.4 (14.8)330 
Oak Valley Bancorp Oakdale, CA OVLY 1,995 63 0.00 9.8 10.8 4.09 60 1.22 12.9 132 10.8 - - 2.0 1.1 253 
Bank7 Corp. Oklahoma City, OK BSVN 1,891 94 0.31 12.2 12.7 5.03 40 2.45 20.5 182 9.7 10.4 - 2.4 (2.3)417 
FB Bancorp, Inc. New Orleans, LA FBLA 1,264 90 1.32 26.8 20.0 ² 4.60 92 0.14 0.5 78  NM - - 0.0 6.1 243 
OptimumBank Holdings, Inc. Fort Lauderdale, FL OPHC 1,083 85 0.33 10.8 ³ 11.7 4.24 49 1.62 14.8 ³ 84 ⁴ 6.2  NM  NM 0.0 (14.5)48 
United Security BancsharesFresno, CAUBFO1,236 89 1.10 10.8 12.4 4.37 58 0.95 8.9 137 15.3 - - 4.6 0.9 183 
1) Core metrics as calculated by S&P Capital IQ Pro
2) Bank level financial data per S&P Capital IQ Pro
3) Calculated using total tangible equity per OPHC filings
4) Price / Tangible Book Value for OPHC includes the dilutive effect of Series B and Series C convertible preferred shares
Note: Price / LTM EPS > 30.0x or < 0.0x considered not meaningful (“NM”)
Source: S&P Capital IQ Pro

8

11.The Section of the Joint Proxy Statement/Prospectus entitled “Comparable Company Analyses” beginning on page 57 is hereby amended by deleting the table of company names at the top of page 59 (the “CWB Peer Group”) and replacing it with the following:

Financials as of September 30, 2025 unless otherwise notedBalance SheetCapital PositionLTM ProfitabilityValuation as of 12/15/2025
 Price /
Tier 1TotalCoreTang.LTMEst.Est.1 Yr
TotalLoan/NPAs/TCE/Lev.RBCEff.CoreROABookCore20262027Div.PriceMkt
AssetsDptsAssetsTARatioRatioNIMRatioROAA¹TCE¹ValueEPS¹EPSEPSYield∆Cap
Company NameCity, StTicker($M)(%)(%)(%)(%)(%)(%)(%)(%)(%)(%)(x)(x)(x)(%)(%)($M)
Westamerica Bancorporation San Rafael, CA WABC 5,914 15 0.04 14.0 15.4 23.3 3.91 38 1.96 13.1 153 10.7 12.2 12.6 3.7 (11.9)1,229 
Heritage Commerce Corp San Jose, CA HTBK 5,624 75 0.06 9.7 9.9 15.4 3.46 61 0.94 10.0 141 14.4 12.7 11.7 4.3 16.0 742 
Five Star Bancorp Rancho Cordova, CA FSBC 4,642 95 0.05 9.3 9.8 13.6 3.48 41 1.37 14.2 187 13.9 11.2 9.9 2.1 14.2 807 
RBB Bancorp Los Angeles, CA RBB 4,208 98 1.29 10.6 11.5 23.6 2.89 62 0.56 5.2 86 17.2 10.6 9.5 2.9 (4.0)380 
California BanCorp. San Diego, CA BCAL 4,101 86 0.38 10.9 11.2 14.7 4.60 52 1.64 16.7 146 9.7 11.3 10.8 2.0 11.3 634 
Bank of Marin Bancorp Novato, CA BMRC 3,869 62 0.92 9.7 10.1 16.1 2.96 70 0.67 6.9 121 17.7 13.1 11.8 3.6 12.4 443 
Sierra Bancorp Porterville, CA BSRR 3,709 85 0.43 9.0 10.7 - 3.71 59 1.09 12.2 139 11.8 10.1 9.8 2.9 9.9 455 
PCB Bancorp Los Angeles, CA PCB 3,364 94 0.24 9.4 11.6 15.2 3.27 51 1.12 11.6 108 9.9 8.9 8.1 3.4 10.3 337 
OP Bancorp Los Angeles, CA OPBK 2,614 95 0.50 8.4 9.0 12.2 3.12 60 0.96 11.3 100 9.5 7.6 7.0 3.2 (13.4)221 
BayCom Corp Walnut Creek, CA BCML 2,604 92 0.48 11.5 11.8 15.7 3.77 63 0.94 8.5 121 14.6 12.5 11.6 3.7 12.3 351 
Avidbank Holdings, Inc. San Jose, CA AVBH 2,362 96 0.12 11.6 11.1 13.5 3.63 57 1.26 14.2 108 7.6 8.6 7.6 0.0 24.0 296 
Community West BancsharesFresno, CACWBC3,612 80 0.20 8.3 9.5 14.1 4.07 62 0.97 ²13.1 ²158 13.5 ²10.4 9.8 2.0 12.6 464 

1) Core metrics as calculated by S&P Capital IQ Pro
2) Calculated using core net income for the quarters ended 12/31/2024 and 3/31/2025 and stated net income for the quarters ended 6/30/2025 and 9/30/2025 per Community West Bancshares earnings releases. All other values per S&P Capital IQ Pro
Note: Price / LTM EPS > 30.0x or < 0.0x considered not meaningful (“NM”)
Source: S&P Capital IQ Pro

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12.The Section of the Joint Proxy Statement/Prospectus entitled “Analysis of Precedent Transactions” beginning on page 59 is hereby amended by deleting the table of Acquiror and Target names at the top of page 60 (the “Nationwide Precedent Transactions”) and replacing it with the following:

Transaction InformationSeller Financial Information
Price/Core1-Day
DealLTMTang.Dpt.MarketTotalLTMLTMTCE/NPAs/
Annc.ValueEPSBookPrem.Prem.AssetsROAAROAETAAssets
AcquirorTargetDate($M)(x)(%)(%)(%)($M)(%)(%)(%)(%)
Enova International, Inc. (IL)Grasshopper Bancorp, Inc. (NY)¹12/11/25387.9NM33224.2-1,4120.638.58.11.21
Home Bancshares, Inc. (AR)Mountain Commerce Bancorp, Inc. (TN)12/08/25154.113.81071.17.31,8030.628.07.90.58
Richmond Mutual Bancorporation, Inc. (IN)Farmers Bancorp (IN)11/12/2585.19.11121.67.31,1020.9012.76.90.25
First Mid Bancshares, Inc. (IL)Two Rivers Financial Group, Inc. (IA)10/30/2592.610.61100.921.61,1890.748.37.31.30
Third Coast Bancshares, Inc. (TX)Keystone Bancshares, Inc. (TX)¹10/22/25123.015.11304.6-1,0200.888.99.20.09
Farmers National Banc Corp. (OH)Middlefield Banc Corp. (OH)10/22/25292.713.91607.026.61,9791.119.99.41.51
HBT Financial, Inc. (IL)CNB Bank Shares, Inc. (IL)10/20/25170.210.51204.015.71,8470.9011.06.70.31
Heritage Financial Corporation (WA)Olympic Bancorp, Inc. (WA)09/25/25176.624.41514.9-1,6930.515.88.40.01
Equity Bancshares, Inc. (KS)Frontier Holdings, LLC (NE)¹09/02/25122.513.81173.0-1,4081.2612.88.50.26
First Financial Bancorp. (OH)BankFinancial Corporation (IL)08/11/25141.7NM91(1.3)5.41,4290.141.210.90.70
Bank First Corporation (WI)Centre 1 Bancorp, Inc. (WI)07/18/25174.028.62318.3-1,5340.517.06.20.28
Investar Holding Corporation (LA)Wichita Falls Bancshares, Inc. (TX)¹07/01/2583.614.291(1.1)-1,5940.626.19.20.39
NB Bancorp, Inc. (MA)Provident Bancorp, Inc. (MA)06/05/25211.7NM93(2.1)7.91,5540.291.915.12.02
TowneBank (VA)Old Point Financial Corporation (VA)04/03/25202.120.21757.332.41,4510.688.88.00.16
MetroCity Bankshares, Inc. (GA)First IC Corporation (GA)03/17/25206.08.314212.481.71,1922.1018.512.20.02
Old Second Bancorp, Inc. (IL)Bancorp Financial, Inc. (IL)¹02/25/25196.5NM1317.4-1,4490.504.711.00.14
Glacier Bancorp, Inc. (MT)Bank of Idaho Holding Company (ID)01/13/25246.217.318712.545.81,3281.0911.19.50.16
1) Bank level financial data shown
Note: Price / LTM EPS > 30.0x or < 0.0x considered not meaningful (“NM”)
Source: S&P Capital IQ Pro

10

13.The Section of the Joint Proxy Statement/Prospectus entitled “Net Present Value Analyses” beginning on page 60 is hereby amended by adding the following to the first paragraph thereunder as a new third sentence following the number 155% at the bottom of page 60:

Piper Sandler selected these price to earnings and tangible book value multiples based on Piper Sandler’s review of, among other matters, the trading multiples of selected companies that Piper Sandler deemed to be comparable to USB.

14.The Section of the Joint Proxy Statement/Prospectus entitled “Net Present Value Analyses” beginning on page 60 is hereby amended by adding the following table after the Earnings Per Share Multiples chart (Annual Estimate Variance) at the bottom of page 61:

The following table describes the discount rate calculation for USB common stock prepared by Piper Sandler. In its normal course of business Piper Sandler employs the Kroll Cost of Capital Navigator in determining an appropriate discount rate in which the discount rate equals the sum of the risk free rate, the equity risk premium, the size premium and the industry premium.

Risk Free Rate
4.80%

20-year Treasury (as of December 15, 2025)
Equity Risk Premium
5.00%

Per Kroll Cost of Capital Navigator
Size Premium
2.66%

Per Kroll Cost of Capital Navigator
Industry Premium
(1.55)%

Per Kroll Cost of Capital Navigator
Discount Rate
10.91%

15.The Section of the Joint Proxy Statement/Prospectus entitled “Net Present Value Analyses” beginning on page 60 is hereby amended by adding the following as a new third sentence to the last full paragraph at the bottom of page 61 directly following the number 175%:

Piper Sandler selected these price to earnings and tangible book value multiples based on Piper Sandler’s review of, among other matters, the trading multiples of selected companies that Piper Sandler deemed to be comparable to CWB.

16.The Section of the Joint Proxy Statement/Prospectus entitled “Net Present Value Analyses” beginning on page 60 is hereby amended by adding the following table after the Earnings Per Share Multiples chart (Annual Estimate Variance) at the bottom of page 62:

The following table describes the discount rate calculation for CWB common stock prepared by Piper Sandler. In its normal course of business Piper Sandler employs the Kroll Cost of Capital Navigator in determining an appropriate discount rate in which the discount rate equals the sum of the risk free rate, the equity risk premium, the size premium and the industry premium.

Risk Free Rate
4.80%

20-year Treasury (as of December 15, 2025)
Equity Risk Premium
5.00%

Per Kroll Cost of Capital Navigator
Size Premium
2.66%

Per Kroll Cost of Capital Navigator
Industry Premium
(1.55)%

Per Kroll Cost of Capital Navigator
Discount Rate
10.91%

17.The Section of the Joint Proxy Statement/Prospectus entitled “Pro Forma Transaction Analysis” beginning on page 62 is hereby amended by adding the following as a new second to last sentence thereof:

For more information about certain of the assumptions provided by CWB for use in Piper Sandler’s pro forma analysis, see the Investor Presentation filed by CWB as an exhibit to its Current Report on Form 8-K filed with the SEC on December 17, 2025, which is incorporated by reference herein.

11

18.The Section of the Joint Proxy Statement/Prospectus entitled “Pro Forma Transaction Analysis” beginning on page 62 is hereby amended by adding the following table directly following the first paragraph thereunder at the top of page 63:

The following table describes estimated earnings per share and tangible book value accretion and dilution metrics for CWB as indicated in the analysis:
Closing
2026E2027E2028E2029E
EPS Accretion/(Dilution)
10.2%19.1%18.0%16.4%
TBVPS Accretion / (Dilution)
(9.5)%(7.4)%(3.4)%(0.2)%2.2%

Cautionary Note Regarding Forward-Looking Statements

This Current Report on Form 8-K includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements often include words such as “believes,” “expects,” “anticipates,” “estimates,” “forecasts,” “intends,” “plans,” “targets,” “potentially,” “probably,” “projects,” “outlook” or similar expressions or future or conditional verbs such as “may,” “will,” “should,” “would,” and “could,” as well as the negative of such words. Forward-looking statements are not historical facts but instead represent management’s current expectations and forecasts regarding future events, many of which are inherently uncertain and outside of our control. Actual results may differ, possibly materially, from those currently expected or projected in these forward-looking statements. In addition to factors disclosed in reports filed by the United Security Bancshares (“Company”) and Community West Bancshares (“CWBC”) with the SEC, risks and uncertainties for the Company, CWBC and the combined company that may cause actual results or outcomes to differ materially from those anticipated include, but are not limited to: (1) the possibility that any of the anticipated benefits of the proposed Merger will not be realized or will not be realized within the expected time period; (2) the risk that integration of the Company’s operations with those of CWBC will be materially delayed or will be more costly or difficult than expected; (3) the parties’ inability to meet expectations regarding the timing of the proposed Merger; (4) changes to tax legislation and their potential effects on the accounting for the Merger; (5) the inability to complete the proposed Merger due to the failure of the Company’s shareholders to adopt the Merger Agreement, or the failure of CWBC’s shareholders to adopt the Merger Agreement or to approve the issuance of CWBC’s common stock in connection with the Merger; (6) the failure to satisfy other conditions to completion of the proposed Merger; (7) the failure of the proposed Merger to close for any other reason; (8) diversion of management’s attention from ongoing business operations and opportunities due to the proposed Merger; (9) the challenges of integrating and retaining key employees; (10) the effect of the announcement of the proposed Merger on the Company’s, CWBC’s or the combined company’s respective customer and employee relationships and operating results; (11) the possibility that the proposed Merger may be more expensive to complete than anticipated, including as a result of unexpected factors or events; (12) the dilution caused by CWBC’s issuance of additional shares of CWBC’s common stock in connection with the Merger; and (13) changes in the global economy and financial market conditions and the business, results of operations and financial condition of the Company, CWBC, and the combined company. Please refer to each of the Company’s and CWBC’s Annual Reports on Form 10-K for the year ended December 31, 2024 for the Company, and December 31, 2025 for CWBC, as well as the Company’s and CWBC’s other filings with the SEC, for a more detailed discussion of risks, uncertainties and factors that could cause actual results to differ from those discussed in the forward-looking statements.

Any forward-looking statement included in this report is based only on information currently available to management and speaks only as of the date on which it is made. Neither the Company nor CWBC undertakes any obligation to publicly update any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise.

Additional Information and Where to Find It

CWBC has filed a registration statement on Form S-4 with the SEC in connection with the proposed transaction. The registration statement includes a joint proxy statement of the Company and CWBC that also constitutes a prospectus of CWBC, which has been sent to the shareholders of the Company and CWBC. Before making any voting decision, the shareholders of the Company and CWBC are advised to read the joint proxy statement/prospectus because it contains important information about the Company, CWBC and the proposed transaction. This document and other documents relating to the Merger filed by the Company can be obtained free of charge from the SEC’s website at www.sec.gov. These documents also can be obtained free of charge by accessing the Company’s website at investors.unitedsecuritybank.com under the tab “Financials” and “SEC Filings” and on CWBC’s website at ir.communitywestbank.com under the tab “Financials.” Alternatively, these documents can be obtained free of charge from the Company upon written request to United Security Bancshares, Attn: Investor Relations,
12

2126 Inyo St., Fresno, CA 93721, or by calling (559) 490-6261, or from CWBC upon written request to Community West Bancshares, Attn: Investor Relations, 7100 N. Financial Dr., Suite 101, Fresno, CA 93720, or by calling (916) 235-4617. The contents of the websites referenced above are not deemed to be incorporated by reference into the registration statement or the joint proxy statement/prospectus.

Participants in the Solicitation

This report does not constitute a solicitation of a proxy, an offer to purchase or a solicitation of an offer to sell any securities. The Company, CWBC, and certain of their directors, executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies from the shareholders of the Company and CWBC in connection with the proposed Merger under SEC rules. Information about the directors and executive officers of the Company and CWBC is included in the joint proxy statement/prospectus for the proposed transaction filed with the SEC. These documents may be obtained free of charge in the manner described above under “Additional Information and Where to Find It.”

Security holders may obtain information regarding the names, affiliations and interests of the Company’s directors and executive officers in the definitive proxy statement of the Company relating to its 2025 Annual Meeting of Shareholders filed with the SEC on April 7, 2025, and in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC on March 20, 2025. Security holders may obtain information regarding the names, affiliations and interests of CWBC’s directors and executive officers in the definitive proxy statement of CWBC relating to its 2025 Annual Meeting of Shareholders filed with the SEC on April 4, 2025, and in CWBC’s Annual Report on Form 10-K for the year ended December 31, 2024, filed with the SEC on March 17, 2025.


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized.
United Security Bancshares
Date:March 20, 2026By: /s/ David A. Kinross
David A. Kinross
Senior Vice President and Chief Financial Officer


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