Who owns Byline Bancorp (BY)
Which tracked institutional funds hold BY, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See BY company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
67 tracked funds added or opened BY while 23 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
BY’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes BY more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in BY 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 2026-Q1 and 2026-Q2, across 192 tracked filers holding BY, 111 increased or opened the position and 79 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 BY between the 2026-Q1 and 2026-Q2 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
- RENAISSANCE TECHNOLOGIES LLC$3M
- ALGERT GLOBAL LLC$2M
- D. E. Shaw & Co., Inc.$746K
- Quantbot Technologies LP$691K
- Brevan Howard Capital Management LP$647K
- Sequoia Financial Advisors, LLC$627K
Full exits 10
- Aristotle Capital Boston, LLC$21M
- T. Rowe Price Investment Management, Inc.$19M
- Assenagon Asset Management S.A.$7M
- SEI INVESTMENTS CO$4M
- Thrivent Financial for Lutherans$3M
- CWM, LLC$861K
Largest adds
- BlackRock, Inc.$28M
- DIMENSIONAL FUND ADVISORS LP$17M
- FEDERATED HERMES, INC.$13M
- AQR CAPITAL MANAGEMENT LLC$10M
- AMERICAN CENTURY COMPANIES INC$9M
- STATE STREET CORP$8M
Largest trims
- WELLINGTON MANAGEMENT GROUP LLP$13M
- FMR LLC$10M
- Qube Research & Technologies Ltd$3M
- MALTESE CAPITAL MANAGEMENT LLC$2M
- GOLDMAN SACHS GROUP INC$1M
- UBS Group AG$1M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 3,510,896 | $132M | 15.5% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 2,424,824 | $91M | 10.7% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 1,191,625 | $45M | 5.3% | 2026-Q2 |
| STATE STREET CORP added | 1,089,293 | $41M | 4.8% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 1,009,951 | $38M | 4.5% | 2026-Q2 |
| Boston Partners trimmed | 883,689 | $33M | 3.9% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 857,825 | $32M | 3.8% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 813,855 | $31M | 3.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 810,208 | $31M | 3.6% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 507,652 | $19M | 2.2% | 2026-Q2 |
| Ararat Capital Management LP trimmed | 490,609 | $18M | 2.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 488,460 | $18M | 2.2% | 2026-Q2 |
| Nuveen, LLC added | 437,302 | $16M | 1.9% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 424,253 | $16M | 1.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 362,683 | $14M | 1.6% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 350,081 | $13M | 1.5% | 2026-Q2 |
| MORGAN STANLEY added | 301,094 | $11M | 1.3% | 2026-Q2 |
| NORTHERN TRUST CORP added | 295,900 | $11M | 1.3% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 269,067 | $10M | 1.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 250,593 | $9M | 1.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 245,280 | $9M | 1.1% | 2026-Q2 |
| ENDEAVOUR CAPITAL ADVISORS INC added | 238,671 | $9M | 1.1% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 219,168 | $8M | 1.0% | 2026-Q2 |
| Empowered Funds, LLC added | 213,253 | $8M | 0.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 212,551 | $8M | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 210,966 | $8M | 0.9% | 2026-Q2 |
| Detalus Advisors, LLC trimmed | 196,050 | $7M | 0.9% | 2026-Q2 |
| DENALI ADVISORS LLC added | 185,516 | $7M | 0.8% | 2026-Q2 |
| FMR LLC trimmed | 182,355 | $7M | 0.8% | 2026-Q2 |
| Bank of New York Mellon Corp added | 167,130 | $6M | 0.7% | 2026-Q2 |
| Creative Planning added | 163,467 | $6M | 0.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 151,407 | $6M | 0.7% | 2026-Q2 |
| Curi Capital, LLC trimmed | 143,042 | $5M | 0.6% | 2026-Q2 |
| ZACKS INVESTMENT MANAGEMENT added | 139,641 | $5M | 0.6% | 2026-Q2 |
| Mariner, LLC added | 137,192 | $5M | 0.6% | 2026-Q2 |
| BARTLETT & CO. WEALTH MANAGEMENT LLC | 134,158 | $5M | 0.6% | 2026-Q2 |
| MALTESE CAPITAL MANAGEMENT LLC trimmed | 130,000 | $5M | 0.6% | 2026-Q2 |
| MENDON CAPITAL ADVISORS CORP | 125,000 | $5M | 0.6% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 123,776 | $5M | 0.5% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 110,959 | $4M | 0.5% | 2026-Q2 |
| FIDUCIENT ADVISORS LLC trimmed | 110,850 | $4M | 0.5% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 106,896 | $4M | 0.5% | 2026-Q2 |
| Trexquant Investment LP trimmed | 98,544 | $4M | 0.4% | 2026-Q2 |
| UBS Group AG trimmed | 96,743 | $4M | 0.4% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 90,304 | $3M | 0.4% | 2026-Q2 |
| Man Group plc added | 88,827 | $3M | 0.4% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 80,600 | $3M | 0.4% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL added | 79,924 | $3M | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 73,908 | $3M | 0.3% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL trimmed | 68,297 | $3M | 0.3% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 67,013 | $3M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 66,300 | $2M | 0.3% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 61,011 | $2M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 58,133 | $2M | 0.3% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND | 57,309 | $2M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 56,879 | $2M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 55,562 | $2M | 0.2% | 2026-Q2 |
| Focus Partners Wealth added | 52,353 | $2M | 0.2% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 51,600 | $2M | 0.2% | 2026-Q2 |
| Campbell & CO Investment Adviser LLC added | 51,493 | $2M | 0.2% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 49,693 | $2M | 0.2% | 2026-Q2 |
| Invesco Ltd. trimmed | 47,610 | $2M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 45,319 | $2M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 40,327 | $2M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 39,605 | $1M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 38,205 | $1M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 32,492 | $1M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 31,999 | $1M | 0.1% | 2026-Q2 |
| QUATTRO FINANCIAL ADVISORS LLC | 30,000 | $1M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 29,858 | $1M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 29,144 | $1M | 0.1% | 2026-Q2 |
| WEDGE CAPITAL MANAGEMENT L L P/NC trimmed | 28,868 | $1M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 28,240 | $1M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 28,153 | $1M | 0.1% | 2026-Q2 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC added | 28,053 | $1M | 0.1% | 2026-Q2 |
| PDT Partners, LLC | 27,315 | $1M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 26,758 | $1M | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD | 26,000 | $979K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 25,813 | $973K | 0.1% | 2026-Q2 |
| TEACHER RETIREMENT SYSTEM OF TEXAS added | 24,908 | $938K | 0.1% | 2026-Q2 |
| Legal & General Group Plc added | 24,770 | $933K | 0.1% | 2026-Q2 |
| DARK FOREST CAPITAL MANAGEMENT LP added | 23,561 | $887K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 22,299 | $840K | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 22,217 | $837K | 0.1% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 19,860 | $740K | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 19,798 | $746K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 19,715 | $742K | 0.1% | 2026-Q2 |
| BANC FUNDS CO LLC trimmed | 19,682 | $741K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 18,638 | $702K | 0.1% | 2026-Q2 |
| Quantbot Technologies LP added | 18,348 | $691K | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 18,081 | $681K | 0.1% | 2026-Q2 |
| Inspire Investing, LLC added | 18,056 | $680K | 0.1% | 2026-Q2 |
| PNC Financial Services Group, Inc. trimmed | 17,327 | $653K | 0.1% | 2026-Q2 |
| Brevan Howard Capital Management LP added | 17,180 | $647K | 0.1% | 2026-Q2 |
| PRINCETON CAPITAL MANAGEMENT LLC added | 17,074 | $643K | 0.1% | 2026-Q2 |
| Sequoia Financial Advisors, LLC new | 16,654 | $627K | 0.1% | 2026-Q2 |
| ALPS ADVISORS INC added | 16,437 | $619K | 0.1% | 2026-Q2 |
| STRS OHIO added | 16,400 | $618K | 0.1% | 2026-Q2 |
| Capstone Financial Advisors, Inc. | 16,040 | $604K | 0.1% | 2026-Q2 |
| Aquatic Capital Management LLC added | 15,478 | $583K | 0.1% | 2026-Q2 |
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.