Byline Bancorp, Inc.
Byline Bancorp, Inc. (BY) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · BY · as of Sep 30, 2025
Ownership Breakdown
175
Institutional Holders
▲ 6 vs Q2
$675.51M
Total Inst. Value
▲ $35.29M vs Q2
45.41M
Shares Outstanding
freeFloat 71.01%
24.36M
13F Shares Held
▲ 406,368 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
BY largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. state commercial banks | 2.85M | 6.50% | 6.50% | $78.94B | Nov 12, 2025 | ▲ 508.6K |
DIMENSIONAL FUND ADVISORS LP state commercial banks | 2.32M | 5.30% | 5.30% | $64.40B | Nov 12, 2025 | ▲ 24.5K |
VANGUARD GROUP INC state commercial banks | 1.77M | 4.05% | 4.05% | $49.22B | Nov 7, 2025 | ▼ 43.4K |
WELLINGTON MANAGEMENT GROUP LLP state commercial banks | 1.24M | 2.82% | 2.82% | $34.28B | Nov 14, 2025 | ▼ 487.6K |
STATE STREET CORP state commercial banks | 988.0K | 2.26% | 2.26% | $27.40B | Nov 14, 2025 | ▲ 158.4K |
FMR LLC state commercial banks | 972.1K | 2.22% | 2.22% | $26.96B | Nov 13, 2025 | ▼ 68.0K |
ARISTOTLE CAPITAL BOSTON, LLC state commercial banks | 886.3K | 2.02% | 2.02% | $24.58B | Nov 14, 2025 | ▼ 7.0K |
AMERICAN CENTURY COMPANIES INC state commercial banks | 803.3K | 1.83% | 1.83% | $22.28B | Nov 12, 2025 | ▲ 68.2K |
GEODE CAPITAL MANAGEMENT, LLC state commercial banks | 750.3K | 1.71% | 1.71% | $20.81B | Nov 12, 2025 | ▲ 133.0K |
BOSTON PARTNERS state commercial banks | 732.8K | 1.67% | 1.67% | $20.32B | Nov 13, 2025 | ▲ 341 |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
26
Increased
+2.14M shares0
New Positions
first time holders20
Decreased
−1.20M shares0
Sold Out
fully exitedNet shares change (top 50)
+942.3K
+2.14M / −1.20M
Net new holders
+6
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
BY insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
2
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
KISTNER WILLIAM G director | May 4, 2026 | Purchase | 100 | $31.97 | $3.2K | 14.2K | Form 4 ↗ |
ABRAHAM THOMAS PRESIDENT, SBC | Apr 16, 2026 | Award | 2,406 | — | — | 45.5K | Form 4 ↗ |
HERSETH MARY JO S. director | Mar 16, 2026 | Purchase | 300 | $30.83 | $9.2K | 18.8K | Form 4 ↗ |
Barkidjija John HEAD OF CRE & SPECIALTY FIN | Feb 26, 2026 | Sale | 4,509 | $32.33 | $145.8K | 19.2K | Form 4 ↗ |
Mando Nicolas CHIEF TECHNOLOGY & OPERATIONS | Feb 22, 2026 | Award | 1,704 | — | — | 16.2K | Form 4 ↗ |
Mando Nicolas CHIEF TECHNOLOGY & OPERATIONS | Feb 22, 2026 | Tax Withhold | 636 | $33.13 | $21.1K | 15.6K | Form 4 ↗ |
Mando Nicolas CHIEF TECHNOLOGY & OPERATIONS | Feb 22, 2026 | Award | 2,231 | — | — | 15.3K | Form 4 ↗ |
Mando Nicolas CHIEF TECHNOLOGY & OPERATIONS | Feb 22, 2026 | Tax Withhold | 772 | $33.13 | $25.6K | 14.5K | Form 4 ↗ |
Fucinato Mark CHIEF CREDIT OFFICER | Feb 22, 2026 | Award | 2,293 | — | — | 25.6K | Form 4 ↗ |
Fucinato Mark CHIEF CREDIT OFFICER | Feb 22, 2026 | Award | 3,948 | — | — | 24.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Byline Bancorp, Inc. (BY) is primarily owned by institutional investors, who hold approximately 53.6% of total shares outstanding. Company insiders own approximately 28.99%, while retail and public investors account for the remaining 17.36%.
The largest institutional shareholder of Byline Bancorp, Inc. is BLACKROCK, INC., holding approximately 2.85 million shares — equal to 6.50% of outstanding shares — as of September 30, 2025.
A total of 175 institutional investors currently hold BY stock, with a combined institutional value of approximately $675,510,593 as of the most recent 13F filing period.
Frequently asked questions
BY ownershipByline Bancorp, Inc. (BY) is primarily owned by institutional investors, who hold approximately 53.6% of shares. The largest shareholder is BLACKROCK, INC. with a 6.50% stake. Company insiders hold 28.99%. Data sourced from SEC Form 13F as of September 30, 2025.