Thomas J Seifert sold $2.2M of NET
Chief Financial Officer at Cloudflare, Inc.. 10,341 shares at an average of $212.30, traded Mar 17, 2026, filed Mar 17, 2026.
Score components
- +22RoleCFO
- +25Trade size$2.2M at market
- 0Share of holdings soldSold 4.4% of holdings
- +15Cluster6 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.
This signal so far: 1m -6.7%, 3m +9.2%, 6m +54.7%.
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 0001473289-26-000010, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Mar 15, 2026 | FTax withholding Class A Common Stock10b5-1 | -2,943 | $212.45 | $625k | 224,625 | Mar 17, 2026 |
| Mar 17, 2026 | CConversion Class A Common Stock10b5-1 | +10,341 | - | - | 234,966 | Mar 17, 2026 |
| Mar 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -200 | $207.68 | $42k | 234,766 | Mar 17, 2026 |
| Mar 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -100 | $208.64 | $21k | 234,666 | Mar 17, 2026 |
| Mar 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -3,041 | $211.69 | $644k | 231,625 | Mar 17, 2026 |
| Mar 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -5,000 | $212.57 | $1.1M | 226,625 | Mar 17, 2026 |
| Mar 17, 2026 | SOpen-market sale Class A Common Stock10b5-1 | -2,000 | $213.23 | $426k | 224,625 | Mar 17, 2026 |
| Mar 17, 2026 | MOption exercise Employee Stock Option (right to buy)derivative10b5-1 | -10,341 | $0.00 | $0 | 60,000 | Mar 17, 2026 |
| Mar 17, 2026 | MOption exercise Class B Common Stockderivative10b5-1 | +10,341 | $0.00 | $0 | 19,266 | Mar 17, 2026 |
| Mar 17, 2026 | CConversion Class B Common Stockderivative10b5-1 | -10,341 | $0.00 | $0 | 8,925 | Mar 17, 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% | |
| 27Weak | Cloudflare, Inc. | Thomas J Seifert Chief Financial Officer | $3.1M 10,000 shares | -8% | |
| 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% |
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.