SEC Form DEFA14A filed by NPK International Inc.
| Preliminary Proxy Statement | |||||
| Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) | |||||
| Definitive Proxy Statement | |||||
| X | Definitive Additional Materials | ||||
| Soliciting Material Pursuant to §240.14a-12 | |||||

| X | No fee required. | ||||
| Fee paid previously with preliminary materials. | |||||
| Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. | |||||

