InsiderChief Financial Officer

Thomas J Seifert Insider Trading Activity

Every SEC Form 4 transaction reported by Thomas J Seifert, sourced directly from SEC EDGAR and updated as new filings are accepted.

By · Insider-trading data from SEC EDGAR
Latest filing:

Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.

Quick Answer

Is Thomas J Seifert buying or selling?

Thomas J Seifert reported 0 open-market buys ($0) and 132 sells ($289.9M) across 132 Form 4 filings at 2 companies — a net selling position of $289.9M.

Source: SEC EDGAR Form 4

What stands out

  • Thomas J Seifert has reported Form 4 transactions at 2 companies; the most active, Cloudflare, Inc. (NET), accounts for 131 of 132 filings (99%).
  • The most recent Form 4 was accepted on Sep 21, 2026 (27 days ago).
  • In the last 12 months: no open-market purchases and 13 sales ($55.9M).
  • The largest open-market sale in the last 12 months was $16.5M of Cloudflare, Inc. (NET) on Aug 6, 2026. SEC ↗

Key Statistics (as of Sep 21, 2026)

Total Form 4 filings
132
SEC EDGAR
Companies
2
Buys (0)
$0
Sells (132)
$289.9M

Insider sentiment

Net selling

Net insider flow of $289.9M in net selling, filed between Mar 5, 2020 – Sep 21, 2026.

Companies Thomas J Seifert files for

#CompanyForm 4 filings
1NETCloudflare, Inc.131
2IPGPIPG PHOTONICS CORP1

Recent Thomas J Seifert transactions

DateTickerRoleTypeSharesValueFiling
Sep 21, 2026NETChief Financial OfficerSale10.0K$3.3MSEC ↗
Aug 19, 2026NETChief Financial OfficerSale10.0K$3.1MSEC ↗
Aug 6, 2026NETChief Financial OfficerSale55.0K$16.5MSEC ↗
Jul 17, 2026NETChief Financial OfficerSale10.0K$2.8MSEC ↗
Jun 17, 2026NETChief Financial OfficerSale10.0K$2.3MSEC ↗
May 19, 2026NETChief Financial OfficerSale10.0K$2.0MSEC ↗
Apr 17, 2026NETChief Financial OfficerSale10.0K$2.0MSEC ↗
Mar 17, 2026NETChief Financial OfficerSale10.3K$2.2MSEC ↗
Feb 25, 2026NETChief Financial OfficerSale41.6K$7.7MSEC ↗
Jan 21, 2026NETChief Financial OfficerSale10.0K$1.8MSEC ↗
Dec 23, 2025NETChief Financial OfficerSale10.0K$2.0MSEC ↗
Nov 21, 2025NETChief Financial OfficerSale41.6K$8.1MSEC ↗
Oct 20, 2025NETChief Financial OfficerSale10.0K$2.1MSEC ↗
Sep 22, 2025NETChief Financial OfficerSale10.0K$2.3MSEC ↗
Aug 21, 2025NETChief Financial OfficerSale41.6K$7.9MSEC ↗
Jul 29, 2025NETChief Financial OfficerSale60.7K$12.2MSEC ↗
Jun 23, 2025NETChief Financial OfficerSale10.0K$1.8MSEC ↗
May 22, 2025NETChief Financial OfficerSale41.6K$6.5MSEC ↗
Apr 28, 2025NETChief Financial OfficerSale10.0K$1.2MSEC ↗
Mar 21, 2025NETCHIEF FINANCIAL OFFICERSale10.0K$1.2MSEC ↗
Mar 6, 2025NETChief Financial OfficerSale15.0K$2.1MSEC ↗
Feb 19, 2025NETChief Financial OfficerSale28.6K$4.6MSEC ↗
Feb 5, 2025NETChief Financial OfficerSale15.0K$2.0MSEC ↗
Jan 21, 2025NETChief Financial OfficerSale65.0K$7.8MSEC ↗
Jan 6, 2025NETChief Financial OfficerSale15.0K$1.7MSEC ↗

Showing the 25 most recent filings of 132. Screen every filing.

Thomas J Seifert insider trading FAQ

Is Thomas J Seifert buying or selling?

Across 132 SEC Form 4 filings, Thomas J Seifert reported 0 open-market purchases totaling $0 and 132 sales totaling $289.9M — a net selling position of $289.9M.

Which companies does Thomas J Seifert file Form 4s for?

Thomas J Seifert has reported insider transactions at 2 companies, most often Cloudflare, Inc. (NET), IPG PHOTONICS CORP (IPGP).

How far back does Thomas J Seifert's filing history go?

Trabud holds Thomas J Seifert's SEC Form 4 filings from Mar 5, 2020 – Sep 21, 2026, sourced directly from SEC EDGAR.

Where does Trabud get Thomas J Seifert's insider trading data?

Directly from SEC EDGAR Form 4 filings. Every transaction on this page is a real filing accepted by the SEC, updated as new filings arrive.

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