Updated Jul 16, 2026
SEIFERT THOMAS J has filed 3 SEC Form 4 filings across 1 company in the last 90 days — selling. Lifetime open-market sales: $59.10M.
Thomas J. Seifert is a corporate executive known for his roles as Chief Financial Officer at Cloudflare, Inc. and WOLFSPEED, INC. He has extensive experience in financial leadership and has been involved in multiple SEC filings related to these companies.
| Role | Chief Financial Officer |
|---|---|
| Notability | 50/100 |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 600 | $235.34 | $141K |
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 2.6K | $234.18 | $617K |
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 3.2K | $233.44 | $739K |
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 600 | $232.00 | $139K |
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 685 | $230.90 | $158K |
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 515 | $229.95 | $118K |
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 900 | $228.91 | $206K |
| 2026-06-17 | NET | Cloudflare, Inc. | S — Open-market sale | 900 | $227.74 | $205K |
| 2026-06-17 | NET | Cloudflare, Inc. | J — Other acquisition / disposition | 10.0K | — | |
| 2026-06-17 | NET | Cloudflare, Inc. | F — Tax withholding / forfeiture | 2.9K | $228.48 | $673K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 270 | $203.02 | $55K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 2.0K | $202.17 | $404K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 3.6K | $201.21 | $718K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 2.4K | $200.20 | $487K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 928 | $199.05 | $185K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 400 | $197.81 | $79K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 300 | $195.14 | $59K |
| 2026-05-19 | NET | Cloudflare, Inc. | S — Open-market sale | 100 | $193.28 | $19K |
| 2026-05-19 | NET | Cloudflare, Inc. | J — Other acquisition / disposition | 10.0K | — | |
| 2026-05-19 | NET | Cloudflare, Inc. | F — Tax withholding / forfeiture | 9.7K | $199.81 | $1.93M |
Thomas J. Seifert is a corporate executive known for his roles as Chief Financial Officer at Cloudflare, Inc. and WOLFSPEED, INC. He has extensive experience in financial leadership and has been involved in multiple SEC filings related to these companies.…
3 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 0 open-market purchases () and 110 open-market sales ($59.10M) across all tracked filings.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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