Thomas J Seifert sold $3.3M of NET
Chief Financial Officer at Cloudflare, Inc.. 10,000 shares at an average of $332.46, traded Sep 17, 2026, filed Sep 21, 2026.
Score components
- +22RoleCFO
- +25Trade size$3.3M at market
- 0Share of holdings soldSold 8.5% of holdings
- +15Cluster3 insiders selling within 14 days
- -15Exercise and sellShares came from an option exercise in the same filing
- -2010b5-1 planPre-scheduled under a 10b5-1 plan
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001473289-26-000029, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Sep 17, 2026 | CConversion Class A Common Stock10b5-1 | +10,000 | - | - | 117,902 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -100 | $318.90 | $32k | 117,802 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -100 | $320.89 | $32k | 117,702 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -100 | $326.56 | $33k | 117,602 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -300 | $328.04 | $98k | 117,302 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -700 | $329.37 | $231k | 116,602 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -700 | $330.23 | $231k | 115,902 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -1,196 | $331.59 | $397k | 114,706 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -1,604 | $332.50 | $533k | 113,102 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -2,632 | $333.62 | $878k | 110,470 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -1,868 | $334.59 | $625k | 108,602 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -600 | $335.32 | $201k | 108,002 | 20 d ago |
| Sep 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -100 | $336.51 | $34k | 107,902 | 20 d ago |
| Sep 17, 2026 | MOption exercise Employee Stock Option (right to buy)derivative10b5-1 | -10,000 | $0.00 | $0 | 0 | 20 d ago |
| Sep 17, 2026 | MOption exercise Class B Common Stockderivative10b5-1 | +10,000 | $0.00 | $0 | 18,925 | 20 d ago |
| Sep 17, 2026 | CConversion Class B Common Stockderivative10b5-1 | -10,000 | $0.00 | $0 | 8,925 | 20 d ago |
Related signals
Other insiders at Cloudflare, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 38Weak | Cloudflare, Inc. | Michelle Zatlyn President and Board Co-Chair | $35M 99,009 shares | -96% | |
| 35Weak | Cloudflare, Inc. | Carl Ledbetter director | $1.8M 5,000 shares | -1% | |
| 35Weak | Cloudflare, Inc. | Carl Ledbetter director | $1.6M 5,000 shares | -1% | |
| 45Moderate | Cloudflare, Inc. | Michelle Zatlyn PRESIDENT & BOARD CO-CHAIR | $28M 99,009 shares | -96% | |
| 45Moderate | Cloudflare, Inc. | Michelle Zatlyn President and Board Co-Chair | $9.6M 76,920 shares | -375% | |
| 27Weak | Cloudflare, Inc. | Thomas J Seifert CHIEF FINANCIAL OFFICER | $1.2M 10,000 shares | -3% | |
| 65Notable | Cloudflare, Inc. | Matthew Prince CEO & Board Co-Chair | $18M 157,152 shares | -300% | |
| 26Weak | Cloudflare, Inc. | Douglas James Kramer Chief Legal Officer | $420k 3,000 shares | -1% | |
| 27Weak | Cloudflare, Inc. | Thomas J Seifert Chief Financial Officer | $2.1M 15,000 shares | -5% | |
| 65Notable | Cloudflare, Inc. | Matthew Prince CEO & Board Co-Chair | $23M 157,152 shares | -300% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.