10%
Peter R. Kellogg is an American billionaire businessman and philanthropist, born on September 5, 1942, with a net worth estimated at around $3.4 billion, primarily from his career on Wall Street.[[5]](https://en.wikipedia.org/wiki/Peter_Kellogg) He built his fortune leading the specialist trading firm Spear, Leeds & Kellogg, which faced regulatory scrutiny in the early 2000s, and later co-founded Kellogg Capital Group, focusing on multi-asset hedge fund strategies including equities, credit, commodities, and macro opportunities.[[4]](https://www.uhnwidata.com/uhnwi-direct/peter-kellogg)[[5]](https://en.wikipedia.org/wiki/Peter_Kellogg) Kellogg has held board positions such as Chairman of Scully Royalty Ltd. and director roles at Nam Tai Property, Inc. and Berkshire School, Inc.[[6]](https://www.marketscreener.com/insider/PETER-KELLOGG-A002NL/)
As a major shareholder and 10% owner of Mercer International Inc. (MERC), a Vancouver-based company in the forest products industry, Peter R. Kellogg owns approximately 5.78 million to 23.26 million shares, valued between $14 million and $87 million depending on reporting dates.[[1]](https://www.insidertrades.com/mercer-international-inc-stock/peter-r-kellogg/)[[3]](https://www.gurufocus.com/insider/57127/peter-r-kellogg) His recent trading activity includes purchasing 225,000 shares on November 13, 2025, at $1.73 per share, bringing his direct ownership to 1.32 million shares, and an additional 63,000 shares on May 10, 2022.[[1]](https://www.insidertrades.com/mercer-international-inc-stock/peter-r-kellogg/)[[3]](https://www.gurufocus.com/insider/57127/peter-r-kellogg) Kellogg is also a 10% owner in other firms like Evans & Sutherland Computer Corp. and has historically held stakes in Thoratec Corp. and TRC Companies Inc.[[3]](https://www.gurufocus.com/insider/57127/peter-r-kellogg)
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