William C. Martin

William C. Martin is a declared insider at 3 companies (senior executive); the most frequent names are Immersion Corp, Barnes & Noble Education, Inc. and Gulfmark Offshore Inc. In total, 56 filings cover trades dated from 30 December 2015 to 7 October 2026.

Market trades split into 9 purchases (€1.4M) and 3 sales (€6.2M). The totals exclude 1 filing filed without an amount. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. The rest of the record consists of 41 share grants and 2 option exercises.

The median purchase comes to €106k. Of 9 purchases, 7 formed part of a group of insiders buying within 30 days of each other. Purchases made close together by different insiders form what is called a cluster. For 6 purchases whose 90-day window has closed, the share price was higher on day 90 than the day after publication in 83% of cases, with a median move of +14.7%. They describe history only and say nothing certain about the share price ahead.

On 8 October 2026 came the latest disclosure, a share grant in Immersion Corp. The latest purchase dates back some time: it was published 780 days ago, on 29 August 2024. The median gap between a trade and its publication by SEC (Form 4) is 3 days. Section 16 rules allow two business days to file each Form 4. This summary is built from SEC (Form 4) disclosures alone and does not predict where the share price will go.