Thomas J Seifert sold $3.1M of NET
Chief Financial Officer at Cloudflare, Inc.. 10,000 shares at an average of $307.32, traded Aug 17, 2026, filed Aug 19, 2026.
Score components
- +22RoleCFO
- +25Trade size$3.1M at market
- 0Share of holdings soldSold 8.3% of holdings
- +15Cluster8 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 0001473289-26-000025, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Aug 17, 2026 | CConversion Class A Common Stock10b5-1 | +10,000 | - | - | 120,846 | Aug 19, 2026 |
| Aug 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -900 | $305.25 | $275k | 119,946 | Aug 19, 2026 |
| Aug 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -2,944 | $306.24 | $902k | 117,002 | Aug 19, 2026 |
| Aug 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -2,456 | $307.29 | $755k | 114,546 | Aug 19, 2026 |
| Aug 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -3,100 | $308.23 | $956k | 111,446 | Aug 19, 2026 |
| Aug 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -300 | $309.07 | $93k | 111,146 | Aug 19, 2026 |
| Aug 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -200 | $312.32 | $62k | 110,946 | Aug 19, 2026 |
| Aug 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -100 | $314.61 | $31k | 110,846 | Aug 19, 2026 |
| Aug 17, 2026 | MOption exercise Employee Stock Option (right to buy)derivative10b5-1 | -10,000 | $0.00 | $0 | 10,000 | Aug 19, 2026 |
| Aug 17, 2026 | MOption exercise Class B Common Stockderivative10b5-1 | +10,000 | $0.00 | $0 | 18,925 | Aug 19, 2026 |
| Aug 17, 2026 | CConversion Class B Common Stockderivative10b5-1 | -10,000 | $0.00 | $0 | 8,925 | Aug 19, 2026 |
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% | |
| 27Weak | Cloudflare, Inc. | Thomas J Seifert Chief Financial Officer | $3.3M 10,000 shares | -8% | |
| 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 | $28M 99,009 shares | -96% | |
| 25Weak | Cloudflare, Inc. | Janel Riley Chief Accounting Officer | $1.6M 5,148 shares | -11% | |
| 20Weak | Cloudflare, Inc. | Alissa Michelle Starzak Chief Legal Officer | $1.8M 5,871 shares | -5% | |
| 17Weak | Cloudflare, Inc. | John Graham-Cumming director | $766k 2,520 shares | -1% | |
| 35Weak | Cloudflare, Inc. | Carl Ledbetter director | $1.4M 5,000 shares | -1% |
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.