Duke John D
Chief Executive Officer
Duke John D has filed 2 SEC Form 4 filings (2 transaction rows) across 1 company, with disclosures dating back to 2026. 2 of those filings fall inside the rolling window. Most recent filing: Mar 23, 2026.
On the most recent filing, Duke John D is listed as Chief Executive Officer at HARVARD BIOSCIENCE INC. Inside the rolling window, Duke John D reported 1 open-market purchase totaling $25K in HBIO and no open-market sales.
Companies traded
Other insiders at HBIO
Insider Buying
$25K
reported purchases (SEC code P)
Insider Selling
$0
reported sales (SEC code S)
Companies
1
in the rolling window
Frequently asked questions
How many SEC Form 4 filings has Duke John D made?
Duke John D has filed 2 SEC Form 4 filings (2 transaction rows) across 1 company since 2026.
Which companies does Duke John D trade?
Duke John D has filed SEC Form 4 disclosures for 1 company, including HBIO.
When was Duke John D's most recent SEC Form 4 filing?
Duke John D's most recent SEC Form 4 filing on Tracefour is dated Mar 23, 2026.
What is Duke John D's job title?
On the most recent SEC Form 4 filings tracked by Tracefour, Duke John D is listed as Chief Executive Officer.
What is Duke John D's total buy and sell value in the current window?
Inside the rolling retention window, Duke John D bought $25K and sold $0 based on SEC Form 4 filings.
What was Duke John D's largest disclosed transaction?
The largest disclosed transaction in the current window is a purchase of 5,000 HBIO shares on 2026-03-16, worth $25K, per SEC Form 4 filings.