Who owns RBB Bancorp (RBB)
Which tracked institutional funds hold RBB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See RBB company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on RBB is one-sided between 2025-Q4 and 2026-Q1: 27 added or opened and 9 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
RBB’s largest tracked holder by dollar value, FJ Capital Management LLC, sizes it at 3.6% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 3.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in RBB divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 119 tracked filers holding RBB, 66 increased or opened the position and 41 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in RBB between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 7
- VANGUARD CAPITAL MANAGEMENT LLC$14M
- VANGUARD PORTFOLIO MANAGEMENT LLC$3M
- EJF Capital LP$2M
- O'SHAUGHNESSY ASSET MANAGEMENT, LLC$2M
- VANGUARD FIDUCIARY TRUST CO$2M
- North Reef Capital Management LP$1M
Full exits 4
- VANGUARD GROUP INC$18M
- Azora Capital LP$638K
- MARSHALL WACE, LLP$635K
- TWO SIGMA ADVISERS, LP$611K
Largest adds
- ALLIANCEBERNSTEIN L.P.$2M
- Hillsdale Investment Management Inc.$2M
- ACADIAN ASSET MANAGEMENT LLC$1M
- FJ Capital Management LLC$1M
- AMERICAN CENTURY COMPANIES INC$1M
- DIMENSIONAL FUND ADVISORS LP$951K
Largest trims
- MILLENNIUM MANAGEMENT LLC$861K
- BARCLAYS PLC$452K
- JPMORGAN CHASE & CO$412K
- MARTINGALE ASSET MANAGEMENT L P$409K
- MORGAN STANLEY$331K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| FJ Capital Management LLC | 1,511,408 | $32M | 14.3% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,141,348 | $24M | 10.8% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 830,214 | $18M | 7.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 660,025 | $14M | 6.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 467,678 | $10M | 4.4% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 382,318 | $8M | 3.5% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 347,330 | $7M | 3.3% | 2026-Q1 |
| Rhino Investment Partners, Inc added | 338,810 | $7M | 3.2% | 2026-Q1 |
| STATE STREET CORP added | 324,822 | $7M | 3.1% | 2026-Q1 |
| Hillsdale Investment Management Inc. added | 221,400 | $5M | 2.1% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 199,735 | $4M | 1.9% | 2026-Q1 |
| LSV ASSET MANAGEMENT trimmed | 188,400 | $4M | 1.8% | 2026-Q1 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC trimmed | 184,088 | $4M | 1.7% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 165,923 | $4M | 1.6% | 2026-Q1 |
| MORGAN STANLEY trimmed | 132,582 | $3M | 1.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 120,946 | $3M | 1.1% | 2026-Q1 |
| NORTHERN TRUST CORP added | 116,171 | $2M | 1.1% | 2026-Q1 |
| EJF Capital LP added | 108,857 | $2M | 1.0% | 2026-Q1 |
| Empowered Funds, LLC added | 101,463 | $2M | 1.0% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 97,585 | $2M | 0.9% | 2026-Q1 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC added | 94,684 | $2M | 0.9% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 88,935 | $2M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 82,767 | $2M | 0.8% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 75,191 | $2M | 0.7% | 2026-Q1 |
| Trexquant Investment LP added | 70,884 | $2M | 0.7% | 2026-Q1 |
| Squarepoint Ops LLC added | 67,298 | $1M | 0.6% | 2026-Q1 |
| Quantinno Capital Management LP added | 66,144 | $1M | 0.6% | 2026-Q1 |
| North Reef Capital Management LP new | 64,150 | $1M | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 63,588 | $1M | 0.6% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 62,138 | $1M | 0.6% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 60,336 | $1M | 0.6% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 59,728 | $1M | 0.6% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 58,968 | $1M | 0.6% | 2026-Q1 |
| KENNEDY CAPITAL MANAGEMENT LLC added | 56,528 | $1M | 0.5% | 2026-Q1 |
| Nuveen, LLC added | 48,633 | $1M | 0.5% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 46,073 | $985K | 0.4% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 44,585 | $953K | 0.4% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 42,753 | $914K | 0.4% | 2026-Q1 |
| Invesco Ltd. added | 41,007 | $876K | 0.4% | 2026-Q1 |
| JOHN G ULLMAN & ASSOCIATES INC | 40,550 | $867K | 0.4% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 35,851 | $766K | 0.3% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP trimmed | 32,724 | $699K | 0.3% | 2026-Q1 |
| Unison Advisors LLC added | 31,955 | $683K | 0.3% | 2026-Q1 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 31,289 | $669K | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 29,634 | $633K | 0.3% | 2026-Q1 |
| Catalina Capital Group, LLC | 29,605 | $633K | 0.3% | 2026-Q1 |
| STRS OHIO added | 27,400 | $586K | 0.3% | 2026-Q1 |
| Odyssean, LLC new | 23,101 | $494K | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 20,921 | $447K | 0.2% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 18,906 | $404K | 0.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 18,261 | $390K | 0.2% | 2026-Q1 |
| COMMONWEALTH EQUITY SERVICES, LLC added | 17,432 | $373K | 0.2% | 2026-Q1 |
| MARTINGALE ASSET MANAGEMENT L P trimmed | 17,000 | $363K | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 16,654 | $356K | 0.2% | 2026-Q1 |
| UBS Group AG added | 12,475 | $267K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 12,226 | $261K | 0.1% | 2026-Q1 |
| Jump Financial, LLC trimmed | 11,264 | $241K | 0.1% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC trimmed | 10,975 | $235K | 0.1% | 2026-Q1 |
| IEQ CAPITAL, LLC trimmed | 10,801 | $231K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 10,682 | $229K | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 10,673 | $228K | 0.1% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD | 10,300 | $220K | 0.1% | 2026-Q1 |
| MetLife Investment Management, LLC trimmed | 10,051 | $215K | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 9,826 | $210K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 7,738 | $165K | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 7,078 | $151K | 0.1% | 2026-Q1 |
| PNC FINANCIAL SERVICES GROUP, INC. added | 6,781 | $145K | 0.1% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | 6,593 | $141K | 0.1% | 2026-Q1 |
| CWM, LLC added | 6,210 | $133K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 6,136 | $131K | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 5,624 | $120K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 5,211 | $111K | 0.0% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 4,539 | $97K | 0.0% | 2026-Q1 |
| Police & Firemen's Retirement System of New Jersey | 3,863 | $83K | 0.0% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 3,640 | $78K | 0.0% | 2026-Q1 |
| BARCLAYS PLC trimmed | 3,164 | $68K | 0.0% | 2026-Q1 |
| FMR LLC added | 2,506 | $54K | 0.0% | 2026-Q1 |
| CITIGROUP INC added | 2,287 | $49K | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) added | 1,840 | $39K | 0.0% | 2026-Q1 |
| CANADA LIFE ASSURANCE Co added | 1,706 | $36K | 0.0% | 2026-Q1 |
| Rockefeller Capital Management L.P. added | 1,637 | $35K | 0.0% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,613 | $34K | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 862,098 | $18M | 7.9% | 2025-Q4 stale |
| Fourthstone LLC trimmed | 50,000 | $938K | 0.4% | 2025-Q3 stale |
| GLOBEFLEX CAPITAL L P | 50,386 | $867K | 0.4% | 2025-Q2 stale |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 46,011 | $792K | 0.4% | 2025-Q2 stale |
| Azora Capital LP new | 30,913 | $638K | 0.3% | 2025-Q4 stale |
| MARSHALL WACE, LLP added | 30,778 | $635K | 0.3% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 29,600 | $611K | 0.3% | 2025-Q4 stale |
| FNY Investment Advisers, LLC added | 25,000 | $430K | 0.2% | 2025-Q2 stale |
| R Squared Ltd added | 20,538 | $385K | 0.2% | 2025-Q3 stale |
| Atom Investors LP trimmed | 16,357 | $282K | 0.1% | 2025-Q2 stale |
| Point72 Asset Management, L.P. new | 12,266 | $253K | 0.1% | 2025-Q4 stale |
| JANE STREET GROUP, LLC trimmed | 12,000 | $248K | 0.1% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC new | 10,637 | $200K | 0.1% | 2025-Q3 stale |
| SENTINEL TRUST CO LBA trimmed | 10,100 | $189K | 0.1% | 2025-Q3 stale |
| Harbor Advisors LLC | 10,000 | $188K | 0.1% | 2025-Q3 stale |
| INTECH INVESTMENT MANAGEMENT LLC new | 10,910 | $180K | 0.1% | 2025-Q1 stale |
| Corebridge Financial, Inc. trimmed | 7,981 | $132K | 0.1% | 2025-Q1 stale |
| SG Americas Securities, LLC trimmed | 5,433 | $112K | 0.0% | 2025-Q4 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.