BY insider trading — Byline Bancorp, Inc.
Over the last 90 days, insiders at Byline Bancorp, Inc. (BY) made 2 open-market purchases worth $15K and 3 open-market sales worth $12.60M, making them net sellers by $12.58M. The largest purchase was by Herseth Mary Jo S. (Director), who bought 300 shares for $12K on Aug 19, 2026. The largest sale was by Del Valle Perochena Antonio (Director), who sold 300,000 shares for $11.73M on Aug 7, 2026. 2 different insiders bought shares in this period — a cluster buy, which many investors watch closely.
Updated Oct 16, 2026.
Recent BY insider transactions
Every Form 4 filed by Byline Bancorp, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Aug 19, 2026 | Kistner William G | Director | P · Purchase | Indirect | 100 | $38.30 | $4K | Form 4 |
| Aug 19, 2026 | Herseth Mary Jo S. | Director | P · Purchase | Indirect | 300 | $38.40 | $12K | Form 4 |
| Aug 13, 2026 | Herencia Roberto R | CHIEF EXECUTIVE OFFICER | S · Sale | Direct | 19,750 | $39.21 | $774K | Form 4 |
| Aug 12, 2026 | Rose Dana | CHIEF HUMAN RESOURCES OFFICER | S · Sale | Direct | 2,421 | $39.00 | $94K | Form 4 |
| Aug 7, 2026 | Mbg Investors I, L.P. | 10% Owner | S · Sale | Direct | 300,000 | $39.10 | $11.73M | Form 4 |
| Aug 7, 2026 | Del Valle Perochena Antonio | Director | S · Sale | Indirect | 300,000 | $39.10 | $11.73M | Form 4 |
| Aug 3, 2026 | Ptacin Brogan | HEAD OF COMMERCIAL BANKING | A · Grant/award | Direct | 9,450 | $12.70 | $120K | Form 4 |
| Aug 3, 2026 | Ptacin Brogan | HEAD OF COMMERCIAL BANKING | D · Disposition | Direct | 9,450 | $39.61 | $374K | Form 4 |
BY insider trading FAQ
Are insiders buying BY stock?
Yes. In the last 90 days, Byline Bancorp, Inc. insiders made 2 open-market purchases totaling $15K, and 3 open-market sales totaling $12.60M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading BY?
Recent buyers: Herseth Mary Jo S., Kistner William G. Recent sellers: Del Valle Perochena Antonio, Herencia Roberto R, Rose Dana.
Where does BY insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
More stocks with insider activity
Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.