United Security Bancshares
ACEST SIMBOL NU MAI ESTE ACTIV

SecurityUBFO / United Security Bancshares
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership92,478 shares
Latest Disclosed Value $ 931,253
Alliancebernstein L.p. ownership in UBFO / United Security Bancshares

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 92,478 shares of United Security Bancshares (US:UBFO) valued at $971,944 USD as of March 31, 2026. The entity filed a previous 13F-HR on August 14, 2025 disclosing 0 shares of United Security Bancshares. The current value of the position is $971,944 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 92,478 92,478 931 0.0003
2025-08-14 2025-06-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 0 -97,024 -100.00 0 -100.00
2025-05-15 2025-03-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 97,024 -46,380 -32.34 869 -39.99 0.0003
2025-02-12 2024-12-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 143,404 -36,700 -20.38 1,448 -7.65 0.0005
2024-11-14 2024-09-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 180,104 -39,000 -17.80 1,569 -1.26 0.0005
2024-08-14 2024-06-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 219,104 -11,614 -5.03 1,589 -10.69 0.0006
2024-05-14 2024-03-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 230,718 -5,242 -2.22 1,779 -10.38 0.0006
2024-02-14 2023-12-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 235,960 20,384 9.46 1,984 23.77 0.0008
2023-11-14 2023-09-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 215,576 41,955 24.16 1,604 38.67 0.0007
2023-08-15 2023-06-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 173,621 29,660 20.60 1,156 25.93 0.0005
2023-05-15 2023-03-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 143,961 21,271 17.34 918 2.46 0.0004
2023-02-15 2022-12-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 122,690 50,463 69.87 897 90.23 0.0004
2022-11-15 2022-09-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 72,227 0 0.00 471 -14.36 0.0002
2022-08-15 2022-06-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 72,227 -1,712 -2.32 550 -10.42 0.0003
2022-05-13 2022-03-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 73,939 -17,356 -19.01 614 -17.14 0.0002
2022-02-14 2021-12-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 91,295 -457 -0.50 741 1.09 0.0003
2021-11-10 2021-09-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 91,752 0 0.00 733 -2.27 0.0003
2021-07-30 2021-06-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 91,752 -78,141 -45.99 750 -46.08 0.0003
2021-05-06 2021-03-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 169,893 -147,021 -46.39 1,391 -37.74 0.0006
2021-02-08 2020-12-31 13F UNITED SEC BANCSHARES CALIF COM 911460103 316,914 -55,946 -15.00 2,234 -1.93 0.0011
2020-11-12 2020-09-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 372,860 11,393 3.15 2,278 -5.79 0.0012
2020-08-13 2020-06-30 13F UNITED SEC BANCSHARES CALIF COM 911460103 361,467 30,220 9.12 2,418 14.06 0.0014
2020-05-14 2020-03-31 13F UNITED SECURITY BANCSHARES C COM 911460103 331,247 45,284 15.84 2,120 -30.90 0.0015
2020-02-18 2019-12-31 13F UNITED SECURITY BANCSHARES C COM 911460103 285,963 69,817 32.30 3,068 34.92 0.0017
2019-11-14 2019-09-30 13F UNITED SECURITY BANCSHARES C COM 911460103 216,146 82,774 62.06 2,274 49.70 0.0014
2019-08-14 2019-06-30 13F UNITED SECURITY BANCSHARES C COM 911460103 133,372 30,409 29.53 1,519 39.23 0.0009
2019-05-14 2019-03-31 13F UNITED SECURITY BANCSHARES C COM 911460103 102,963 11,179 12.18 1,091 24.12 0.0007
2019-02-13 2018-12-31 13F UNITED SECURITY BANCSHARES C COM 911460103 91,784 11,084 13.73 879 -1.90 0.0007
2018-11-08 2018-09-30 13F UNITED SECURITY BANCSHARES C COM 911460103 80,700 -23,940 -22.88 896 -23.55 0.0006
2018-08-13 2018-06-30 13F UNITED SECURITY BANCSHARES C COM 911460103 104,640 -55,187 -34.53 1,172 -31.78 0.0008
2018-05-14 2018-03-31 13F UNITED SECURITY BANCSHARES C COM 911460103 159,827 -72,642 -31.25 1,718 -32.81 0.0012
2018-02-13 2017-12-31 13F UNITED SECURITY BANCSHARES C COM 911460103 232,469 -61,873 -21.02 2,557 -8.55 0.0018
2017-11-13 2017-09-30 13F UNITED SECURITY BANCSHARES C COM 911460103 294,342 -36,143 -10.94 2,796 -8.54 0.0021
2017-08-10 2017-06-30 13F UNITED SECURITY BANCSHARES C COM 911460103 330,485 -145,777 -30.61 3,057 -12.08 0.0024
2017-05-11 2017-03-31 13F UNITED SECURITY BANCSHARES C COM 911460103 476,262 4,715 1.00 3,477 -4.84 0.0028
2017-02-13 2016-12-31 13F UNITED SECURITY BANCSHARES C COM 911460103 471,547 4,668 1.00 3,654 23.82 0.0030
2016-11-10 2016-09-30 13F UNITED SECURITY BANCSHARES C COM 911460103 466,879 4,622 1.00 2,951 -0.57 0.0025
2016-08-11 2016-06-30 13F UNITED SECURITY BANCSHARES C COM 911460103 462,257 60,910 15.18 2,968 49.37 0.0026
2016-05-13 2016-03-31 13F UNITED SECURITY BANCSHARES C COM 911460103 401,347 44,073 12.34 1,987 3.98 0.0017
2016-02-16 2015-12-31 13F/A-1 UNITED SECURITY BANCSHARES C COM 911460103 357,274 12,797 3.71 1,911 4.65 0.0016
2016-02-12 2015-12-31 13F UNITED SECURITY BANCSHARES C COM 911460103 357,274 1,894
2015-11-13 2015-09-30 13F UNITED SECURITY BANCSHARES C COM 911460103 344,477 51,773 17.69 1,826 23.80 0.0016
2015-08-14 2015-06-30 13F UNITED SECURITY BANCSHARES C COM 911460103 292,704 23,353 8.67 1,475 2.36 0.0012
2015-05-13 2015-03-31 13F UNITED SECURITY BANCSHARES COM 911460103 269,351 48,097 21.74 1,441 19.49 0.0012
2015-02-13 2014-12-31 13F UNITED SECURITY BANCSHARES COM 911460103 221,254 43,012 24.13 1,206 21.45 0.0010
2014-11-13 2014-09-30 13F UNITED SECURITY BANCSHARES COM 911460103 178,242 63,242 54.99 993 55.40 0.0008
2014-08-13 2014-06-30 13F UNITED SECURITY BANCSHARES COM 911460103 115,000 114,542 25,009.17 639 21,200.00 0.0005
2014-05-13 2014-03-31 13F UNITED SECURITY BANCSHARES COM 911460103 458 458 3 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.