RBB Bancorp
US ˙ NasdaqGS ˙ US74930B1052

SecurityRBB / RBB Bancorp
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership830,214 shares
Latest Disclosed Value $ 17,741,803
Dimensional Fund Advisors Lp reports 2.05% increase in ownership of RBB / RBB Bancorp

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 830,214 shares of RBB Bancorp (US:RBB) valued at $17,741,673 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 813,519 shares of RBB Bancorp. This represents a change in shares of 2.05% during the quarter. The current value of the position is $19,526,633 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)
2026-05-07 2026-03-31 13F RBB BANCORP COM 74930B105 830,214 16,695 2.05 17,742 5.66 0.0008
2026-02-12 2025-12-31 13F RBB BANCORP COM 74930B105 813,519 4,999 0.62 16,791 10.71 0.0035
2025-11-12 2025-09-30 13F RBB BANCORP COM 74930B105 808,520 22,509 2.86 15,168 12.12 0.0033
2025-08-12 2025-06-30 13F RBB BANCORP COM 74930B105 786,011 26,554 3.50 13,527 7.96 0.0031
2025-05-13 2025-03-31 13F RBB BANCORP COM 74930B105 759,457 23,534 3.20 12,531 -16.90 0.0031
2025-02-13 2024-12-31 13F RBB BANCORP COM 74930B105 735,923 13,824 1.91 15,079 -9.28 0.0036
2024-11-07 2024-09-30 13F RBB BANCORP COM 74930B105 722,099 24,443 3.50 16,622 26.67 0.0040
2024-08-09 2024-06-30 13F RBB BANCORP COM 74930B105 697,656 53,539 8.31 13,122 13.12 0.0034
2024-05-10 2024-03-31 13F RBB BANCORP COM 74930B105 644,117 40,367 6.69 11,601 0.90 0.0031
2024-02-07 2023-12-31 13F RBB BANCORP COM 74930B105 603,750 44,565 7.97 11,496 60.87 0.0034
2023-11-09 2023-09-30 13F RBB BANCORP COM 74930B105 559,185 -22,660 -3.89 7,147 2.86 0.0023
2023-08-09 2023-06-30 13F RBB BANCORP COM 74930B105 581,845 -87,156 -13.03 6,947 -33.00 0.0022
2023-05-12 2023-03-31 13F RBB BANCORP COM 74930B105 669,001 29,699 4.65 10,370 79,661.54 0.0035
2023-02-09 2022-12-31 13F RBB BANCORP COM 74930B105 639,302 30,987 5.09 13 -99.90 0.0039
2022-11-10 2022-09-30 13F RBB BANCORP COM 74930B105 608,315 35,677 6.23 12,641 6.80 0.0049
2022-08-12 2022-06-30 13F RBB BANCORP COM 74930B105 572,638 61,683 12.07 11,836 -1.39 0.0042
2022-05-13 2022-03-31 13F RBB BANCORP COM 74930B105 510,955 24,437 5.02 12,003 -5.84 0.0037
2022-02-09 2021-12-31 13F RBB BANCORP COM 74930B105 486,518 4,471 0.93 12,747 4.89 0.0039
2021-11-12 2021-09-30 13F RBB BANCORP COM 74930B105 482,047 17,415 3.75 12,153 7.99 0.0039
2021-08-12 2021-06-30 13F RBB BANCORP COM 74930B105 464,632 21,398 4.83 11,254 25.25 0.0036
2021-05-14 2021-03-31 13F RBB BANCORP COM 74930B105 443,234 12,520 2.91 8,985 35.62 0.0030
2021-03-08 2020-12-31 13F/A-2 RBB BANCORP COM 74930B105 430,714 2,099 0.49 6,625 36.32 0.0024
2021-02-11 2020-12-31 13F RBB BANCORP COM 74930B105 430,714 2,099 6,625 2,392.5979
2020-11-12 2020-09-30 13F RBB BANCORP COM 74930B105 428,615 11,064 2.65 4,860 -14.74 0.0021
2020-08-13 2020-06-30 13F RBB BANCORP COM 74930B105 417,551 59,636 16.66 5,700 16.07 0.0025
2020-05-14 2020-03-31 13F RBB BANCORP COM 74930B105 357,915 47,044 15.13 4,911 -25.38 0.0026
2020-02-14 2019-12-31 13F RBB BANCORP COM 74930B105 310,871 66,486 27.21 6,581 36.76 0.0024
2019-11-12 2019-09-30 13F RBB BANCORP COM 74930B105 244,385 45,782 23.05 4,812 25.28 0.0019
2019-08-13 2019-06-30 13F RBB BANCORP COM 74930B105 198,603 43,775 28.27 3,841 31.95 0.0015
2019-08-12 2019-03-31 13F/A-2 RBB BANCORP COM 74930B105 154,828 54,621 54.51 2,911 65.30 0.0012
2019-05-10 2019-03-31 13F RBB BANCORP COM 74930B105 154,828 54,621 2,911
2019-02-26 2018-12-31 13F/A-1 RBB BANCORP COM 74930B105 100,207 55,461 123.95 1,761 60.68 0.0008
2019-02-13 2018-12-31 13F RBB BANCORP COM 74930B105 100,207 55,461 1,761
2018-11-13 2018-09-30 13F RBB BANCORP COM 74930B105 44,746 44,746 1,096 0.0004
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.