Byline Bancorp Inc
Ownership
Ownership Structure
Who owns Byline Bancorp Inc (BY)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 71.5% of the shares are freely tradable; institutional investors hold 56.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.77 | 3,510,896 | +6.6 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 5.37 | 2,424,824 | +2.5 | 06/30/2026 |
| T. Rowe Price Investment Management,Inc. | 3.31 | 1,495,588 | +143.3 | 06/30/2026 |
| Vanguard Capital Management, LLC | 2.64 | 1,191,625 | -5.3 | 06/30/2026 |
| State Street Corp | 2.41 | 1,089,293 | +5.6 | 06/30/2026 |
| American Century Companies Inc | 2.24 | 1,009,951 | +11.6 | 06/30/2026 |
| Boston Partners Global Investors, Inc | 1.96 | 883,689 | -3.8 | 06/30/2026 |
| Federated Hermes Inc | 1.90 | 857,825 | +37.4 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Avantis US Small Cap Value ETF | 2.05 | 917,345 | +0.1 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 1.93 | 861,148 | +8.9 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Mbg Investors I, L.p. | 10% Owner | 11,535,145 | 451,024,170 $ | Aug 7, 2026 | direct |
| Del Valle Perochena Antonio | Director | 11,535,145 | 451,024,170 $ | Aug 7, 2026 | indirect |
| Herencia Roberto R | CHIEF EXECUTIVE OFFICER | 411,643 | 16,095,241 $ | Aug 13, 2026 | direct |
| Ptacin Brogan | HEAD OF COMMERCIAL BANKING | 25,859 | 1,011,087 $ | Aug 3, 2026 | direct |
| Herseth Mary Jo S. | Director | 19,100 | 746,810 $ | Aug 19, 2026 | indirect |
| Kistner William G | Director | 14,289 | 558,700 $ | Aug 19, 2026 | indirect |
| Rose Dana | CHIEF HUMAN RESOURCES OFFICER | 11,605 | 453,756 $ | Aug 12, 2026 | direct |
| Stewart Pamela C | Director | 7,496 | 293,094 $ | Oct 26, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 26, 2026 | Stewart Pamela C | Director | Buy | 1,160 | 38.61 | 44,785 |
| Aug 19, 2026 | Herseth Mary Jo S. | Director | Buy | 300 | 38.40 | 11,519 |
| Aug 19, 2026 | Kistner William G | Director | Buy | 100 | 38.30 | 3,830 |
| Aug 13, 2026 | Herencia Roberto R | CHIEF EXECUTIVE OFFICER | Sell | 19,750 | 39.21 | 774,307 |
| Aug 12, 2026 | Rose Dana | CHIEF HUMAN RESOURCES OFFICER | Sell | 2,421 | 39.00 | 94,419 |
| Aug 7, 2026 | Mbg Investors I, L.p. | 10% Owner | Sell | 300,000 | 39.10 | 11,730,000 |
| Aug 7, 2026 | Del Valle Perochena Antonio | Director | Sell | 300,000 | 39.10 | 11,730,000 |
| Aug 3, 2026 | Ptacin Brogan | HEAD OF COMMERCIAL BANKING | Other | 9,450 | 39.61 | 374,321 |
| Aug 3, 2026 | Ptacin Brogan | HEAD OF COMMERCIAL BANKING | Other | 9,450 | 12.70 | 120,015 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 2, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.