Why is $KOP stock down today?

Koppers Holdings, Inc. · Lumber & Wood Products (No Furniture)

Why is $KOP down today?

The likely driver

Koppers Holdings Inc.: Q2 FY2026 results, three months to Jun 30, 2026

SEC filing · Aug 6

The numbers behind the move

Short interest

4.1% of float

Days to cover

4.8d

Float

18.9M · Low

Float rotation

0.0x

KOP: a low 18.9M-share float.

Price

$43.83

Move today

-4.8%

Volume vs avg

0.0x

Scanner alerts today

Flagged in 30 days

Market cap

$870M

Prev close

$46.03

Avg volume

177K

Nothing has triggered on KOP yet in this session. Our scanner has flagged it 20 times in the last 30 days , most recently on October 6 for big percentage moves, unusual volume, which is why this page is here. See the full KOP page for the chart and the alert history.

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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.