BY Byline Bancorp, Inc.

NYSE
$38.67

Byline Bancorp, Inc. (BY) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal Bearish Selling ran elevated versus BY's own trailing one-year pace, with 0% of sale value under a prearranged plan.
Cluster activity 2 buyers in the last 30 days 2 buyers in the last 90 days 4 sellers in the last 90 days
Insiders buying
2
2 transactions
Insiders selling
4
4 transactions
Purchases
$15.3K
400 shares
Sales
$24.3M
622,171 shares
Net activity
-$24.3M
purchases less sales

How much of that selling was preplanned? 0% planned / 100% discretionary

10b5-1 plan sales $0 0 transactions · 0 shares
Discretionary sales $24.3M 4 transactions · 622,171 shares

Largest single sale: $11.7M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: August 19, 2026 , by KISTNER WILLIAM G .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
HERSETH MARY JO S. Director Buy 300 $38.40 $11.5K 19,100
KISTNER WILLIAM G Director Buy 100 $38.30 $3.8K 14,289
HERENCIA ROBERTO R CHIEF EXECUTIVE OFFICER Sell 19,750 $39.21 $774.3K 411,643 −4.6% of holding
Rose Dana CHIEF HUMAN RESOURCES OFFICER Sell 2,421 $39.00 $94.4K 11,605 −17.3% of holding
DEL VALLE PEROCHENA ANTONIO Director Sell 300,000 $39.10 $11.7M 11,535,145 −2.5% of holding
MBG INVESTORS I, L.P. 10% Owner Sell 300,000 $39.10 $11.7M 11,535,145 −2.5% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.