Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in BY held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 3.3M | $104.0M | +0.4% | 7.255% | 0.00% |
| 2 | DIMENSIONAL FUND ADVISORS LP | 2.4M | $74.7M | +1.6% | 5.211% | 0.02% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 1.3M | $39.7M | — | 2.771% | 0.00% |
| 4 | STATE STREET CORP | 1.0M | $32.6M | +3.4% | 2.270% | 0.00% |
| 5 | WELLINGTON MANAGEMENT GROUP LLP | 1.0M | $32.3M | -14.2% | 2.254% | 0.01% |
| 6 | Boston Partners | 918K | $29.1M | +30.0% | 2.022% | 0.03% |
| 7 | AMERICAN CENTURY COMPANIES INC | 905K | $28.6M | +7.7% | 1.993% | 0.01% |
| 8 | FMR LLC | 826K | $26.1M | -13.6% | 1.819% | 0.00% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 788K | $24.9M | +3.1% | 1.735% | 0.00% |
| 10 | Aristotle Capital Boston, LLC | 675K | $21.3M | -15.8% | 1.486% | 1.32% |
| 11 | AQR CAPITAL MANAGEMENT LLC | 665K | $21.0M | +31.8% | 1.465% | 0.01% |
| 12 | FEDERATED HERMES, INC. | 624K | $19.7M | +8.8% | 1.375% | 0.03% |
| 13 | Ararat Capital Management, LP | 624K | $19.7M | -4.2% | 1.373% | 11.09% |
| 14 | Nuveen, LLC | 425K | $13.4M | -5.7% | 0.935% | 0.00% |
| 15 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 424K | $13.4M | -0.9% | 0.932% | 0.27% |
| 16 | Qube Research & Technologies Ltd | 342K | $10.8M | -1.0% | 0.752% | 0.01% |
| 17 | VANGUARD PORTFOLIO MANAGEMENT LLC | 336K | $10.6M | — | 0.739% | 0.00% |
| 18 | GOLDMAN SACHS GROUP INC | 299K | $9.5M | +8.4% | 0.659% | 0.00% |
| 19 | MILLENNIUM MANAGEMENT LLC | 288K | $9.1M | +80.4% | 0.633% | 0.01% |
| 20 | MORGAN STANLEY | 282K | $8.9M | -17.5% | 0.621% | 0.00% |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 268K | $8.5M | -1.1% | 0.591% | 0.00% |
| 22 | NORTHERN TRUST CORP | 266K | $8.4M | +2.8% | 0.587% | 0.00% |
| 23 | Assenagon Asset Management S.A. | 227K | $7.2M | — | 0.500% | 0.01% |
| 24 | MALTESE CAPITAL MANAGEMENT LLC | 221K | $7.0M | -16.8% | 0.486% | 1.37% |
| 25 | TWO SIGMA INVESTMENTS, LP | 207K | $6.5M | +17.2% | 0.456% | 0.01% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in BY — a direct measure of their conviction.
Filings activity in BY during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 186 | +7.5% | 46.65% | +3.76 pp | $750M | +8.8% |
| Q4 2025 | 173 | +1.2% | 42.89% | +2.38 pp | $690M | +5.9% |
| Q3 2025 | 171 | +2.4% | 40.51% | +2.51 pp | $651M | +6.6% |
| Q2 2025 | 167 | +13% | 38.00% | +6.03 pp | $611M | +19% |
| Q1 2025 | 148 | +4.2% | 31.97% | 3.76 pp | $514M | 11% |
| Q4 2024 | 142 | +1.4% | 35.73% | +4.28 pp | $575M | +14% |
| Q3 2024 | 140 | +3.7% | 31.45% | 8.25 pp | $506M | 21% |
| Q2 2024 | 135 | — | 39.70% | — | $638M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying BY stock.
Based on Q1 2026 13F filings, institutional ownership of Byline Bancorp, Inc. stands at 46.7%, held across 186 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of BY, with approximately 3,294,923 shares worth $0.10B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of BY, including MILLENNIUM MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for BY is 69 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
32 institutions opened new positions in BY during Q1 2026, while 19 fully exited. 121 added to existing positions and 33 trimmed.
BY institutional ownership rose by 3.76 percentage points quarter-over-quarter, with a net change of +13 holders.
The top 10 institutions account for 55.1% of all reported 13F value in BY, and the top 25 account for 78.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Byline Bancorp, Inc. (BY) Institutional Ownership