Director Sonja Michelle Wilkerson filed a statement of changes in beneficial ownership with the SEC on September 15, 2026, disclosing the acquisition of 29.352 dividend equivalent rights tied to deferred compensation restricted stock units in Koppers Holdings Inc. common stock.

Key Highlights

  • Reporting person: Sonja Michelle Wilkerson, identified as a Director of Koppers Holdings Inc. (NYSE:KOP)
  • Transaction date: September 14, 2026, with the filing submitted September 15, 2026
  • Securities acquired: 29.352 dividend equivalent rights (DERs), each the economic equivalent of one share of Koppers Holdings Inc. common stock
  • Price paid: $0, as disclosed in the filing
  • Resulting position: 385.202 derivative securities beneficially owned following the transaction, held directly
  • Transaction code: A (acquisition), recorded under Table II for derivative securities

Koppers Holdings Director Wilkerson Receives DERs Under Deferred Compensation Plan

According to the filing, the 29.352 dividend equivalent rights were accrued in connection with additional time-based restricted stock units ("RSUs") credited to Wilkerson under the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). The filing states that each DER "is the economic equivalent of one share of Koppers Holdings Inc. common stock," and the transaction code recorded was A, indicating an acquisition at a price of $0.

The filing explains the conditions under which these DERs will ultimately be payable. Once released, the RSUs corresponding to the DERs will become payable according to Wilkerson's election of payment designation on file under the Plan. The filing specifies that payment will be "either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person." Koppers Holdings Inc. is a Pittsburgh, Pennsylvania-based company listed on the New York Stock Exchange.

Following the reported transaction, Wilkerson beneficially owns 385.202 derivative securities in direct form, as disclosed in Table II of the filing. The filing was signed by Stephanie L. Apostolou as Attorney in Fact on September 15, 2026.

What Was Disclosed

The filing disclosed the accrual of 29.352 dividend equivalent rights tied to deferred RSUs under the Koppers Holdings Inc. Director Deferred Compensation Plan, acquired at $0, bringing Wilkerson's total derivative holdings to 385.202 units as of September 14, 2026.