Koppers Layoffs & WARN Notices — 160 Workers Affected

All WARN Act mass layoff and plant closure notices filed by Koppers.

Data updated 2026-02-20

Total Notices

160

Workers Affected

States

2016

First Filing

2026

Latest Filing

Data Insights

Industry Breakdown

Workers affected by industry sector

Layoff Types

Workers affected by notice type

Koppers WARN Act Filings

WARN Act layoff notices
Company	Location	Employees	Notice Date	Type
Koppers	Florence, SC	66	2026-02-20	Layoff
Koppers	Follansbee, WV	48	2019-06-04	Closure
Koppers	Clairton, PA	46	2016-06-01

Koppers Layoff FAQ

Is Koppers laying off in 2026?

Yes. Koppers has filed 1 WARN Act notice in 2026 affecting 66 workers. See the filings table above for locations and dates.

How many layoffs has Koppers had?

Koppers has filed 3 WARN Act notices affecting a total of 160 workers across 3 states.

When was Koppers's most recent layoff?

Koppers's most recent WARN Act filing was on 2026-02-20.

What states has Koppers laid off workers in?

Koppers has filed WARN Act notices in: Pennsylvania, South Carolina, West Virginia.

What is the WARN Act?

The Worker Adjustment and Retraining Notification (WARN) Act is a federal law that requires employers with 100 or more employees to provide 60 calendar days' advance notice of plant closings and mass layoffs.

How do I get notified about Koppers layoffs?

Subscribe using the form above to receive free daily email alerts whenever new WARN Act notices are filed. You can also set up custom filters and webhooks with a paid API plan at warnfirehose.com/pricing.