Thomas J Seifert Insider Trading Activity

Corporate InsiderCFO · CIK 1473289

103

Total trades

$60.5M

Total volume

May 18, 2026

Last activity

NET

Cloudflare, Inc.

Thomas J Seifert has been net-selling over the last 12 months with 0 purchases and 103 sales across 1 company.

NET is the most-traded position with 103 trades. The largest single transaction was a sale of NET for $7.3M on Jul 28, 2025.

Performance Scorecard

Forward stock performance after each transaction by Thomas J Seifert. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.

PERIODAVG BUY RETURNAVG SELL AVOIDEDSUCCESS RATETRADES
30 days—-4.8%34%95
90 days—-6.1%28%83
120 days—-2.9%39%66

Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.

Price & Trades

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NET · Cloudflare, Inc.

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Recent Trades

Showing the 50 most recent of 103 disclosed trades.

DATETICKERTYPESHARESPRICEVALUEROLE
May 18, 2026NETSell2,000$202.17$404KCFO
May 18, 2026NETSell270$203.02$55KCFO
May 18, 2026NETSell3,570$201.21$718KCFO
May 18, 2026NETSell400$197.81$79KCFO
May 18, 2026NETSell100$193.28$19KCFO
May 18, 2026NETSell2,432$200.20$487KCFO
May 18, 2026NETSell928$199.05$185KCFO
May 18, 2026NETSell300$195.14$59KCFO
Apr 17, 2026NETSell1,475$199.48$294KCFO
Apr 17, 2026NETSell2,725$200.51$546KCFO
Apr 17, 2026NETSell2,076$195.09$405KCFO
Apr 17, 2026NETSell1,000$196.97$197KCFO
Apr 17, 2026NETSell1,724$196.04$338KCFO
Apr 17, 2026NETSell400$200.95$80KCFO
Apr 17, 2026NETSell600$198.03$119KCFO
Mar 17, 2026NETSell100$208.64$21KCFO
Mar 17, 2026NETSell200$207.68$42KCFO
Mar 17, 2026NETSell2,000$213.23$426KCFO
Mar 17, 2026NETSell3,041$211.69$644KCFO
Mar 17, 2026NETSell5,000$212.57$1.1MCFO
Feb 20, 2026NETSell200$187.38$37KCFO
Feb 20, 2026NETSell500$186.10$93KCFO
Feb 20, 2026NETSell700$185.09$130KCFO
Feb 20, 2026NETSell1,000$183.78$184KCFO
Feb 20, 2026NETSell1,300$182.53$237KCFO
Feb 20, 2026NETSell1,900$180.68$343KCFO
Feb 20, 2026NETSell1,500$181.82$273KCFO
Feb 20, 2026NETSell395$194.05$77KCFO
Feb 20, 2026NETSell2,400$179.51$431KCFO
Feb 20, 2026NETSell300$188.77$57KCFO
Feb 20, 2026NETSell2,613$190.35$497KCFO
Feb 20, 2026NETSell100$195.19$20KCFO
Feb 20, 2026NETSell4,700$178.53$839KCFO
Feb 20, 2026NETSell2,766$193.12$534KCFO
Feb 20, 2026NETSell4,771$192.18$917KCFO
Feb 20, 2026NETSell8,133$191.13$1.6MCFO
Feb 20, 2026NETSell8,279$177.18$1.5MCFO
Jan 20, 2026NETSell1,800$178.08$321KCFO
Jan 20, 2026NETSell3,472$177.17$615KCFO
Jan 20, 2026NETSell100$181.98$18KCFO
Jan 20, 2026NETSell928$176.27$164KCFO
Jan 20, 2026NETSell600$181.27$109KCFO
Jan 20, 2026NETSell1,900$180.09$342KCFO
Jan 20, 2026NETSell1,200$179.41$215KCFO
Dec 22, 2025NETSell483$203.35$98KCFO
Dec 22, 2025NETSell3,328$202.37$673KCFO
Dec 22, 2025NETSell353$198.64$70KCFO
Dec 22, 2025NETSell4,836$201.52$975KCFO
Dec 22, 2025NETSell1,000$200.58$201KCFO
Nov 20, 2025NETSell2,272$190.31$432KCFO

Top Companies Traded

TICKERCOMPANYTRADESTOTAL VOLUME
NETCloudflare, Inc.103$60.5M

Other insiders at Cloudflare, Inc.

8 other tracked filers at NET.

Matthew Prince

CEO

295

Trades

Michelle Zatlyn

President

144

Trades

John Graham-Cumming

Director

66

Trades

Carl Ledbetter

Director

37

Trades

Kramer Douglas James

CHIEF LEGAL OFFICER

26

Trades

Riley Janel

Chief Accounting Officer

11

Trades

Hawkins Mark J

Director

9

Trades

Suder Katrin

Director

3

Trades