Thomas J. Seifert is CFO at Cloudflare, Inc. (NET). They have made 67 open-market trades across 2 companies since 2002, most recently 2026-09-17.
CIK 0001473289
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 67 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMD | 151,842 | $80.3M |
| NET | 107,902 | $32.0M |
| SYMC | 242,941 | $5.8M |
| IPGP | 8,946 | $636K |
| WOLF | 20,476 | $475K |
| Total | $119.1M |
Shares reported on the most recent Form 4, priced at the 2026-09-21 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| NET | SELL · 10b5-1 | 2026-09-17 | 2026-09-21 | $332.46 | $3.3M | -0.5% | — | — |
| NET | SELL · 10b5-1 | 2026-08-17 | 2026-08-19 | $307.32 | $3.1M | +4.4% | +10.6% | — |
| NET | SELL · 10b5-1 | 2026-08-04 | 2026-08-06 | $300.30 | $16.5M | -4.0% | -9.5% | — |
| NET | SELL · 10b5-1 | 2026-07-17 | 2026-07-17 | $276.92 | $2.8M | -2.8% | +10.3% | +13.5% |
| NET | SELL · 10b5-1 | 2026-06-17 | 2026-06-17 | $232.39 | $2.3M | +8.9% | +23.3% | +45.3% |
| NET | SELL · 10b5-1 | 2026-05-18 | 2026-05-19 | $200.61 | $2.0M | +32.3% | +9.4% | +50.0% |
| NET | SELL · 10b5-1 | 2026-04-17 | 2026-04-17 | $197.98 | $2.0M | +6.5% | +1.3% | +36.9% |
| NET | SELL · 10b5-1 | 2026-03-17 | 2026-03-17 | $212.37 | $4.3M | -3.8% | -6.5% | +11.7% |
| NET | SELL | 2026-02-20 | 2026-02-24 | $185.04 | $7.7M | +19.2% | +28.3% | +32.7% |
| NET | SELL | 2026-01-20 | 2026-01-21 | $178.37 | $1.8M | +5.2% | +2.2% | +19.8% |
| NET | SELL · 10b5-1 | 2025-12-22 | 2025-12-23 | $201.75 | $3.8M | -1.3% | -13.6% | +10.0% |
| NET | SELL · 10b5-1 | 2025-11-20 | 2025-11-21 | $193.56 | $14.0M | +8.7% | +7.6% | +2.5% |
| NET | SELL · 10b5-1 | 2025-10-20 | 2025-10-20 | $212.01 | $3.5M | +4.4% | -8.0% | -16.8% |
| NET | SELL · 10b5-1 | 2025-09-22 | 2025-09-22 | $228.07 | $3.6M | -1.7% | -7.7% | -11.5% |
| NET | SELL · 10b5-1 | 2025-08-20 | 2025-08-21 | $190.84 | $14.7M | +7.0% | +18.7% | +2.0% |
| NET | SELL · 10b5-1 | 2025-07-25 | 2025-07-29 | $200.31 | $22.6M | +2.1% | +6.5% | +12.3% |
| NET | SELL · 10b5-1 | 2025-07-21 | 2025-07-22 | $199.88 | $13.9M | +5.3% | +1.4% | +12.1% |
| NET | SELL · 10b5-1 | 2025-06-20 | 2025-06-23 | $180.34 | $2.9M | +2.9% | +1.7% | +22.8% |
| NET | SELL · 10b5-1 | 2025-05-20 | 2025-05-22 | $156.78 | $13.0M | +10.2% | +18.5% | +24.5% |
| NET | SELL · 10b5-1 | 2025-04-25 | 2025-04-28 | $120.14 | $1.2M | +2.8% | +34.0% | +65.0% |
| NET | SELL · 10b5-1 | 2025-03-20 | 2025-03-21 | $120.00 | $1.2M | -2.5% | -16.7% | +46.2% |
| NET | SELL · 10b5-1 | 2025-03-05 | 2025-03-06 | $141.83 | $4.0M | -11.4% | -24.3% | +31.5% |
| NET | SELL · 10b5-1 | 2025-02-19 | 2025-02-19 | $161.98 | $9.0M | -9.7% | -24.7% | -0.5% |
| NET | SELL · 10b5-1 | 2025-02-03 | 2025-02-05 | $136.75 | $3.9M | +18.1% | -11.3% | -14.4% |
| NET | SELL · 10b5-1 | 2025-01-17 | 2025-01-21 | $119.90 | $14.4M | +14.7% | +29.6% | -15.4% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.