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David Walt, co-founder of Illumina's core bead array technology and director at Quanterix, has sold $114 million in ILMN stock across 4,807 transactions — while recently buying $1.4 million of QTRX shares.
John Hennessy, Alphabet's chairman and former Stanford president, has filed 5,684 insider transactions totaling $64 million in GOOGL sales — with the latest batch on February 13, 2026.
J. Mariner Kemper, CEO of UMB Financial Corporation, has filed 3,764 insider transactions totaling $91 million in UMBF sales, with $2.4 million sold in early February 2026 at prices above $128.
W. Nicholas Howley, the founder and former CEO of TransDigm Group, has filed 3,515 insider transactions selling $1.26 billion in TDG and related stock — most recently in November 2025 at $1,340+ per share.
Martine Rothblatt, the founder and CEO of United Therapeutics, has filed 6,305 insider transactions totaling over $1 billion in UTHR sales — while continuing to exercise and sell options in December 2025.
Robert S. Keane, founder of Cimpress (Vistaprint parent), has filed 4,058 insider transactions totaling $129 million in sales across CMPR and Astronics (ATRO).
Patrick G. Ryan, founder of Aon Corporation and CEO of Ryan Specialty, has filed 2,444 insider transactions including $181 million in sales and $78 million in purchases across 3 companies.
Paul J. Fribourg, chairman of Continental Grain and director at multiple public companies, has filed 1,700 insider transactions including $402 million in sales and $120 million in purchases across 9 companies.
Dennis Polk, director and former CEO of TD SYNNEX, has filed 3,031 insider transactions totaling $95 million in sales at the IT distribution giant he led through its transformative Synnex-Tech Data merger.
Robert H. Schottenstein, longtime director at M/I Homes, has filed 2,493 insider transactions totaling $99 million in sales at the homebuilder he helped grow from a regional player to a national builder.
Micky Arison, former CEO and chairman of Carnival Corporation, has filed 5,445 insider transactions totaling $3.26 billion in sales across CCL and CUK shares since 2003.
Kavitark Ram Shriram, one of Google's earliest investors and an Alphabet board director, has sold $2.16 billion in GOOG stock across 2,385 insider transactions since 2004.
L. John Doerr, Kleiner Perkins chair and longtime Alphabet director, has filed 3,078 insider transactions including $1.58 billion in sales across Google and 14 other companies.
Sergey Brin, co-founder and director of Alphabet, has filed 10,633 insider transactions totaling $25.3 billion in sales — the largest insider sell total in the tech sector.
Ronald Tutor, longtime leader of construction giant Tutor Perini, has filed 1,809 insider transactions totaling $578 million in sales and $4.4 million in purchases across the company he led for decades.
Douglas Lebda, founder and former CEO of LendingTree, has filed 1,059 insider transactions totaling $273 million in sales and $8.7 million in purchases. His most recent filing is from February 2026.
Balu Balakrishnan, President and CEO of Power Integrations, has filed 1,975 transactions selling $179 million in POWI stock — one of the most prolific semiconductor insider sellers by filing count.
James Foster, longtime chairman and former CEO of Charles River Laboratories, has filed 3,711 insider transactions since 2003, selling $266 million and purchasing $2 million in CRL stock.
Joshua Boger, founder and former CEO of Vertex Pharmaceuticals, has filed 1,769 insider transactions totaling $184 million in sales, spanning the company's transformation from biotech startup to cystic fibrosis franchise leader.
Michelle Zatlyn, co-founder and president of Cloudflare, has sold $551 million in NET stock since the company's 2019 IPO, making her one of the most prolific insider sellers in the cybersecurity sector.