SEIFERT THOMAS J
SEC CIK 1473289 · EDGAR
BoughtSold
Most active insiders at NET, 12 months
| # | Insider | Title | Bought | Sold |
|---|---|---|---|---|
| 1 | Prince Matthew | CEO, Board Co-COB, Dir, 10% | — | $373.66M |
| 2 | Zatlyn Michelle | Pres, Board Co-COB, Dir | — | $228.67M |
| 3 | SEIFERT THOMAS J | CFO | — | $55.87M |
| 4 | Ledbetter Carl | Dir | — | $32.43M |
| 5 | Riley Janel | CAO | — | $8.78M |
| 6 | Graham-Cumming John | Dir | — | $6.36M |
| 7 | Kramer Douglas James | CLO | — | $5.59M |
| 8 | Starzak Alissa Michelle | CLO | — | $5.32M |
| 9 | Suder Katrin | Dir | — | $879.2K |
| 10 | Hawkins Mark J | Dir | — | $725.0K |
Transactions 236
| X | Filed | Traded | Ticker | Company | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DT | 2026-09-21 16:50 | 2026-09-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 117.9K | +9% | — |
| DMT | 2026-09-21 16:50 | 2026-09-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $332.46 | -10.0K | 107.9K | -8% | -$3.32M |
| 2026-09-15 19:07 | 2026-09-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $327.23 | -2,944 | 107.9K | -3% | -$963.4K | |
| DT | 2026-08-19 17:35 | 2026-08-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 120.8K | +9% | — |
| DMT | 2026-08-19 17:35 | 2026-08-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $307.32 | -10.0K | 110.8K | -8% | -$3.07M |
| 2026-08-18 17:00 | 2026-08-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $315.78 | -2,944 | 110.8K | -3% | -$929.7K | |
| DT | 2026-08-06 19:03 | 2026-08-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | M - OptEx | $44.72 | +55.0K | 168.8K | +48% | +$2.46M |
| DMT | 2026-08-06 19:03 | 2026-08-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale+OE | $300.30 | -55.0K | 113.8K | -33% | -$16.52M |
| DT | 2026-07-17 19:01 | 2026-07-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $281.75 | -2,943 | 113.8K | -3% | -$829.2K |
| DT | 2026-07-17 19:01 | 2026-07-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 123.8K | +9% | — |
| DMT | 2026-07-17 19:01 | 2026-07-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $276.92 | -10.0K | 113.8K | -8% | -$2.77M |
| DT | 2026-06-17 17:56 | 2026-06-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $228.48 | -2,944 | 116.7K | -2% | -$672.6K |
| DT | 2026-06-17 17:56 | 2026-06-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 126.7K | +9% | — |
| DMT | 2026-06-17 17:56 | 2026-06-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $232.39 | -10.0K | 116.7K | -8% | -$2.32M |
| DT | 2026-05-19 17:55 | 2026-05-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $199.81 | -9,667 | 212.0K | -4% | -$1.93M |
| DT | 2026-05-19 17:55 | 2026-05-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 222.0K | +5% | — |
| DMT | 2026-05-19 17:55 | 2026-05-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $200.61 | -10.0K | 212.0K | -5% | -$2.01M |
| DT | 2026-04-17 17:33 | 2026-04-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $178.65 | -2,944 | 221.7K | -1% | -$525.9K |
| DT | 2026-04-17 17:33 | 2026-04-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 231.7K | +5% | — |
| DMT | 2026-04-17 17:33 | 2026-04-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $197.98 | -10.0K | 221.7K | -4% | -$1.98M |
| DM | 2026-03-17 | 2026-03-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $212.31 | -10.3K | 234.8K | -4% | -$2.20M |
| D | 2026-03-17 | 2026-03-17 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.3K | 235.0K | +5% | — |
| D | 2026-03-17 | 2026-03-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $212.45 | -2,943 | 224.6K | -1% | -$625.2K |
| 2026-03-13 | 2026-02-06 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | A - Grant | $0.00 | +142.1K | 227.6K | +166% | $0 | |
| DM | 2026-02-24 | 2026-02-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $185.04 | -41.6K | 118.7K | -26% | -$7.69M |
| D | 2026-02-24 | 2026-02-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 127.0K | +9% | — |
| 2026-02-18 | 2026-02-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $195.85 | -20.5K | 117.0K | -15% | -$4.01M | |
| DM | 2026-01-21 | 2026-01-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $178.37 | -10.0K | 146.6K | -6% | -$1.78M |
| D | 2026-01-21 | 2026-01-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 147.5K | +7% | — |
| D | 2025-12-23 | 2025-12-22 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 147.5K | +7% | — |
| DM | 2025-12-23 | 2025-12-22 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $201.70 | -10.0K | 137.5K | -7% | -$2.02M |
| DM | 2025-11-21 | 2025-11-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $194.18 | -41.6K | 163.4K | -20% | -$8.07M |
| D | 2025-11-21 | 2025-11-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 179.0K | +6% | — |
| 2025-11-17 | 2025-11-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $210.60 | -20.5K | 169.0K | -11% | -$4.31M | |
| DM | 2025-10-20 | 2025-10-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $211.81 | -10.0K | 189.5K | -5% | -$2.12M |
| D | 2025-10-20 | 2025-10-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 199.5K | +5% | — |
| D | 2025-09-22 | 2025-09-22 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 199.5K | +5% | — |
| DM | 2025-09-22 | 2025-09-22 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $227.65 | -10.0K | 189.5K | -5% | -$2.28M |
| D | 2025-08-21 | 2025-08-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 231.1K | +5% | — |
| DM | 2025-08-21 | 2025-08-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $190.64 | -41.6K | 218.4K | -16% | -$7.92M |
| 2025-08-19 | 2025-08-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $195.38 | -20.5K | 221.1K | -8% | -$4.00M | |
| DMI | 2025-07-29 | 2025-07-25+ | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +60.7K | 400 | New | — |
| DMI | 2025-07-29 | 2025-07-25+ | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $200.30 | -60.7K | 0 | -100% | -$12.16M |
| DM | 2025-07-22 | 2025-07-21 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $198.13 | -10.0K | 251.1K | -4% | -$1.98M |
| D | 2025-07-22 | 2025-07-21 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 251.6K | +4% | — |
| DMI | 2025-07-22 | 2025-07-21 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +34.3K | 8,343 | New | — |
| DMI | 2025-07-22 | 2025-07-21 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $200.17 | -34.3K | 0 | -100% | -$6.86M |
| DM | 2025-06-23 | 2025-06-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $180.76 | -10.0K | 245.3K | -4% | -$1.81M |
| D | 2025-06-23 | 2025-06-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 251.6K | +4% | — |
| D | 2025-05-22 | 2025-05-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 283.1K | +4% | — |
| DM | 2025-05-22 | 2025-05-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $156.78 | -41.6K | 241.6K | -15% | -$6.52M |
| 2025-05-16 | 2025-05-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $154.49 | -20.5K | 273.1K | -7% | -$3.16M | |
| D | 2025-04-28 | 2025-04-25 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $120.14 | -10.0K | 293.6K | -3% | -$1.20M |
| D | 2025-04-28 | 2025-04-25 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 303.6K | +3% | — |
| D | 2025-03-21 | 2025-03-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $120.00 | -10.0K | 293.6K | -3% | -$1.20M |
| D | 2025-03-21 | 2025-03-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +10.0K | 303.6K | +3% | — |
| DM | 2025-03-06 | 2025-03-05 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $141.77 | -15.0K | 308.3K | -5% | -$2.13M |
| D | 2025-03-06 | 2025-03-05 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 308.6K | +5% | — |
| DM | 2025-02-19 | 2025-02-19 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $162.07 | -28.6K | 312.5K | -8% | -$4.64M |
| D | 2025-02-19 | 2025-02-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $171.16 | -14.9K | 307.2K | -5% | -$2.55M |
| D | 2025-02-19 | 2025-02-19 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 322.2K | +5% | — |
| 2025-02-07 | 2025-02-05 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | A - Grant | $0.00 | +69.2K | 322.1K | +27% | $0 | |
| DM | 2025-02-05 | 2025-02-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $136.63 | -15.0K | 255.2K | -6% | -$2.05M |
| D | 2025-02-05 | 2025-02-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 267.9K | +6% | — |
| 2025-02-03 | 2025-02-03 | WOLF | WOLFSPEED, INC. | SEIFERT THOMAS J | Dir | A - Grant | $6.09 | +1,642 | 20.5K | +9% | +$10,000 | |
| DM | 2025-01-21 | 2025-01-17+ | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $119.74 | -65.0K | 281.2K | -19% | -$7.78M |
| DM | 2025-01-21 | 2025-01-17+ | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +65.0K | 286.7K | +29% | — |
| DM | 2025-01-06 | 2025-01-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $113.81 | -15.0K | 256.7K | -6% | -$1.71M |
| D | 2025-01-06 | 2025-01-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 267.9K | +6% | — |
| D | 2024-12-19 | 2024-12-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 267.9K | +6% | — |
| DM | 2024-12-19 | 2024-12-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $112.72 | -15.0K | 252.9K | -6% | -$1.69M |
| 2024-12-09 | 2024-12-05 | WOLF | WOLFSPEED, INC. | SEIFERT THOMAS J | Dir | A - Grant | $0.00 | +18.8K | 18.8K | New | $0 | |
| DM | 2024-12-05 | 2024-12-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $109.90 | -15.0K | 255.4K | -6% | -$1.65M |
| D | 2024-12-05 | 2024-12-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 267.9K | +6% | — |
| D | 2024-11-19 | 2024-11-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $89.77 | -14.9K | 266.5K | -5% | -$1.34M |
| D | 2024-11-19 | 2024-11-19 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 281.5K | +6% | — |
| DM | 2024-11-19 | 2024-11-19 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $95.02 | -28.6K | 277.6K | -9% | -$2.72M |
| DM | 2024-11-04 | 2024-11-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $86.79 | -15.0K | 287.8K | -5% | -$1.30M |
| D | 2024-11-04 | 2024-11-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 296.4K | +5% | — |
| D | 2024-10-21 | 2024-10-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 296.4K | +5% | — |
| DM | 2024-10-21 | 2024-10-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $90.88 | -15.0K | 281.4K | -5% | -$1.36M |
| D | 2024-10-04 | 2024-10-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 296.4K | +5% | — |
| DM | 2024-10-04 | 2024-10-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $79.19 | -15.0K | 281.4K | -5% | -$1.19M |
| D | 2024-09-19 | 2024-09-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 296.4K | +5% | — |
| DM | 2024-09-19 | 2024-09-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $78.36 | -15.0K | 283.5K | -5% | -$1.18M |
| D | 2024-09-05 | 2024-09-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 296.4K | +5% | — |
| DM | 2024-09-05 | 2024-09-04 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $78.05 | -15.0K | 292.5K | -5% | -$1.17M |
| DM | 2024-08-22 | 2024-08-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $82.84 | -28.6K | 285.6K | -9% | -$2.37M |
| D | 2024-08-22 | 2024-08-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 310.0K | +5% | — |
| 2024-08-16 | 2024-08-15 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | F - Tax | $82.16 | -14.9K | 295.0K | -5% | -$1.22M | |
| D | 2024-08-05 | 2024-08-02 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 324.9K | +5% | — |
| DM | 2024-08-05 | 2024-08-02 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $78.71 | -15.0K | 309.9K | -5% | -$1.18M |
| DM | 2024-07-19 | 2024-07-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $78.89 | -15.0K | 316.2K | -5% | -$1.18M |
| D | 2024-07-19 | 2024-07-18 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 324.9K | +5% | — |
| D | 2024-07-03 | 2024-07-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 324.9K | +5% | — |
| DM | 2024-07-03 | 2024-07-03 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $84.97 | -15.0K | 309.9K | -5% | -$1.27M |
| DM | 2024-06-24 | 2024-06-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $78.47 | -15.0K | 309.9K | -5% | -$1.18M |
| D | 2024-06-24 | 2024-06-20 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 324.9K | +5% | — |
| DM | 2024-06-06 | 2024-06-05 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | S - Sale | $69.12 | -15.0K | 317.8K | -5% | -$1.04M |
| D | 2024-06-06 | 2024-06-05 | NET | Cloudflare, Inc. | SEIFERT THOMAS J | CFO | C - Cnv Deriv | — | +15.0K | 324.9K | +5% | — |
Purchase Sale Sale after option exercise All abbreviations