Insider · CIK 0001583840
Xianzhi Sean Fan
Files at RMBS (RAMBUS INC). First filing Feb 19, 2025, latest May 26, 2026.
In brief
Xianzhi Sean Fan files SEC Form 4 as COO at RMBS (RAMBUS INC). Since Feb 19, 2025, Xianzhi Sean Fan has reported 0 open-market buys worth $0 and 2 open-market sells worth $9.3M, the latest filed on May 26, 2026.
A track record needs three past buys with six months of prices behind them; Xianzhi Sean Fan has 0, so none is measured yet.
The newest scored trade: sold $5.8M of RMBS on May 26, 2026, filed May 26, 2026, scored 65 (notable). In the last 12 months: 0 buys worth $0 and 1 sell worth $5.8M.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
RMBS: RAMBUS INC
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 65Notable | RAMBUS INC | $5.8M 37,914 shares | -18% | +194% from low-1% from high | |
| 55Moderate | RMBSsell RAMBUS INC | $3.6M 52,327 shares | -36% | - |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| May 26, 2026 | RMBS RAMBUS INC. | 37,914 0.04% of outstanding | $5.8M | May 26, 2026 | none |
| Feb 19, 2025 | RMBS RAMBUS INC | 52,327 0.05% of outstanding | $3.6M | Feb 19, 2025 | none |
| Dec 11, 2023 | RMBS RAMBUS INC. | 16,904 0.02% of outstanding | $1.1M | Dec 11, 2023 | none |
Transactions
Every row this insider has filed, 13 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| May 26, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock | -37,814 | $151.69 | $5.7M | 168,458 | May 26, 2026 |
| May 26, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock | -100 | $152.35 | $15k | 168,358 | May 26, 2026 |
| Apr 1, 2026 | RMBS RAMBUS INC | AGrant or award Common Stock | +22,234 | $0.00 | $0 | 216,188 | Apr 3, 2026 |
| Apr 1, 2026 | RMBS RAMBUS INC | FTax withholding Common Stock | -9,916 | $89.95 | $892k | 206,272 | Apr 3, 2026 |
| Feb 1, 2026 | RMBS RAMBUS INC | AGrant or award Common Stock | +148,802 | $0.00 | $0 | 286,357 | Feb 3, 2026 |
| Feb 1, 2026 | RMBS RAMBUS INC | FTax withholding Common Stock | -92,403 | $113.71 | $11M | 193,954 | Feb 3, 2026 |
| Nov 21, 2025 | RMBS RAMBUS INC | GGift Common Stock | -300 | $0.00 | $0 | 137,555 | Nov 21, 2025 |
| Nov 19, 2025 | RMBS RAMBUS INC | GGift Common Stock | -300 | $0.00 | $0 | 137,855 | Nov 20, 2025 |
| Apr 1, 2025 | RMBS RAMBUS INC | AGrant or award Common Stock | +47,810 | $0.00 | $0 | 141,651 | Apr 3, 2025 |
| Apr 1, 2025 | RMBS RAMBUS INC | FTax withholding Common Stock | -3,496 | $52.29 | $183k | 138,155 | Apr 3, 2025 |
| Feb 19, 2025 | RMBS RAMBUS INC | SOpen-market sale Common Stock | -52,327 | $68.02 | $3.6M | 93,841 | Feb 19, 2025 |
| Feb 1, 2025 | RMBS RAMBUS INC | AGrant or award Common Stock | +112,675 | $0.00 | $0 | 224,246 | Feb 4, 2025 |
| Feb 1, 2025 | RMBS RAMBUS INC | FTax withholding Common Stock | -78,078 | $60.35 | $4.7M | 146,168 | Feb 4, 2025 |
Questions about Xianzhi Sean Fan
Answered from the filings on this page, as of the latest one.
Is Xianzhi Sean Fan buying or selling?
In the last 12 months Xianzhi Sean Fan reported 0 open-market buys worth $0 and 1 open-market sell worth $5.8M on SEC Form 4; the latest was sold $5.8M of RMBS on May 26, 2026. Grants, option exercises and tax withholding are not counted.
How did Xianzhi Sean Fan's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Xianzhi Sean Fan has 0.
Where does Xianzhi Sean Fan file Form 4?
Xianzhi Sean Fan has filed Form 4 at RMBS (RAMBUS INC) as EVP, COO. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
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.