Hoben International, Ltd.

Martin Cookson February 28, 2018

Hess Perlite

Jake Hess February 28, 2018

Gulf Perlite LLC

Konstantin Mitsiou February 28, 2018

Genper Group of Companies

Emir Mert February 28, 2018

Exfoliators (Aust) Pty Ltd

Graeme Raper February 28, 2018

EP Minerals, Reno, NV, USA

Julie Brown February 28, 2018

EP Minerals, Blair, NE, USA

Julie Brown February 28, 2018

Dicalite Management Group

Matt Goecker February 28, 2018

Cevahir Perlite

Ibrahim Ekrem Cevahir February 28, 2018

Carolina Perlite Company, Inc.

Linda Chirico February 28, 2018

Aztec Perlite Company, Inc.

Anna DiNardo-Johnson February 28, 2018