Why is $BY stock up today?

Byline Bancorp, Inc. Common Stock · State Commercial Banks

Why is $BY up today?

The likely driver

Byline Bancorp, Inc. and ILLINOIS STATE Bancorp, Inc. Announce Definitive Merger Agreement

SEC EDGAR·8:15 PM ET

›Based upon the closing price of Byline’s common stock of $37.63 on October 5, 2026, this represents a fully diluted transaction value of approximately $87.9 million or $261.23 per Illinois State Bancorp common share.

The numbers behind the move

Short interest

23.2% of float

Days to cover

3.6d

Float

5.0M · Medium

Float rotation

0.1x

Insider buying

3 open-market

BY: 23.2% of the float is sold short (3.6 days to cover), 3 open-market insider buys.

Price

$36.57

Move today

+0.1%

Volume vs avg

1.1x

Scanner alerts today

Flagged in 30 days

Market cap

$1.7B

Prev close

$36.54

Avg volume

266K

Nothing has triggered on BY yet in this session. Our scanner has flagged it 9 times in the last 30 days , most recently on October 6 for unusual volume, which is why this page is here. See the full BY page for the chart and the alert history.

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Other stocks moving today

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Each opens that stock’s own why-is-it-moving page.

Move and volume are based on the latest market data and refresh live on this page. Scanner alerts are our own real-time unusual-volume signals. This is research, not investment advice.