Insider · CIK 0001341984
Luc Seraphin
Files at RMBS (RAMBUS INC). First filing Apr 3, 2025, latest Apr 3, 2026.
In brief
Luc Seraphin files SEC Form 4 as CEO, president and director at RMBS (RAMBUS INC). Since Apr 3, 2025, Luc Seraphin has reported 0 open-market buys worth $0 and 6 open-market sells worth $6.2M, the latest filed on Apr 3, 2026.
A track record needs three past buys with six months of prices behind them; Luc Seraphin has 0, so none is measured yet.
The newest scored trade: sold $470k of RMBS on Apr 2, 2026, filed Apr 3, 2026, scored 30 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 2 sells worth $4.4M.
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 |
|---|---|---|---|---|---|
| 30Weak | RAMBUS INC | $470k 5,426 shares | -2% | +117% from low-26% from high | |
| 50Moderate | RAMBUS INC | $3.9M 39,914 shares | -11% | +130% from low-21% from high | |
| 28Weak | RAMBUS INC | $355k 7,603 shares | -2% | +16% from low-35% from high | |
| 23Weak | RAMBUS INC | $478k 10,000 shares | -3% | +24% from low-31% from high | |
| 22Weak | RAMBUS INC | $468k 10,000 shares | -3% | +12% from low-37% from high | |
| 23Weak | RAMBUS INC | $509k 10,000 shares | -3% | +37% from low-24% from high |
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 |
|---|---|---|---|---|---|
| Apr 2, 2026 | RMBS RAMBUS INC. | 5,426 0.01% of outstanding | $470k | Apr 2, 2026 | $3.9M |
| Mar 2, 2026 | RMBS RAMBUS INC. | 39,914 0.04% of outstanding | $3.9M | Mar 2, 2026 | none |
| Apr 23, 2025 | RMBS RAMBUS INC. | 6,348 0.01% of outstanding | $298k | Apr 23, 2025 | $2.6M |
| Apr 22, 2025 | RMBS RAMBUS INC. | 1,255 0.00% of outstanding | $56k | Apr 22, 2025 | $2.6M |
| Apr 15, 2025 | RMBS RAMBUS INC. | 10,000 0.01% of outstanding | $478k | Apr 15, 2025 | $2.1M |
| Apr 8, 2025 | RMBS RAMBUS INC. | 10,000 0.01% of outstanding | $468k | Apr 8, 2025 | $1.6M |
| Apr 1, 2025 | RMBS RAMBUS INC. | 10,000 0.01% of outstanding | $509k | Apr 1, 2025 | $1.1M |
| Mar 25, 2025 | RMBS RAMBUS INC. | 10,000 0.01% of outstanding | $586k | Mar 25, 2025 | $538k |
| Mar 18, 2025 | RMBS RAMBUS INC. | 10,000 0.01% of outstanding | $538k | Mar 18, 2025 | none |
| Mar 26, 2024 | RMBS RAMBUS INC. | 15,000 0.01% of outstanding | $940k | Mar 26, 2024 | $2.7M |
| Mar 19, 2024 | RMBS RAMBUS INC. | 15,000 0.01% of outstanding | $875k | Mar 19, 2024 | $1.9M |
| Mar 12, 2024 | RMBS RAMBUS INC. | 15,000 0.01% of outstanding | $940k | Mar 12, 2024 | $933k |
| Mar 5, 2024 | RMBS RAMBUS INC. | 15,000 0.01% of outstanding | $933k | Mar 5, 2024 | none |
Transactions
Every row this insider has filed, 20 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Apr 1, 2026 | RMBS RAMBUS INC | AGrant or award Common Stock10b5-1 | +32,684 | $0.00 | $0 | 363,754 | Apr 3, 2026 |
| Apr 1, 2026 | RMBS RAMBUS INC | FTax withholding Common Stock10b5-1 | -12,561 | $89.95 | $1.1M | 351,193 | Apr 3, 2026 |
| Apr 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -2,511 | $86.04 | $216k | 348,682 | Apr 3, 2026 |
| Apr 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -2,750 | $87.11 | $240k | 345,932 | Apr 3, 2026 |
| Apr 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -165 | $88.35 | $15k | 345,767 | Apr 3, 2026 |
| Mar 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -1,679 | $95.83 | $161k | 369,305 | Mar 3, 2026 |
| Mar 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -7,225 | $97.38 | $704k | 362,080 | Mar 3, 2026 |
| Mar 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -13,654 | $98.22 | $1.3M | 348,426 | Mar 3, 2026 |
| Mar 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -9,469 | $99.17 | $939k | 338,957 | Mar 3, 2026 |
| Mar 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -6,587 | $100.20 | $660k | 332,370 | Mar 3, 2026 |
| Mar 2, 2026 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -1,300 | $101.65 | $132k | 331,070 | Mar 3, 2026 |
| Feb 1, 2026 | RMBS RAMBUS INC | AGrant or award Common Stock | +143,744 | $0.00 | $0 | 463,507 | Feb 3, 2026 |
| Feb 1, 2026 | RMBS RAMBUS INC | FTax withholding Common Stock | -92,523 | $113.71 | $11M | 370,984 | Feb 3, 2026 |
| Apr 22, 2025 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -1,255 | $45.00 | $56k | 325,589 | Apr 24, 2025 |
| Apr 23, 2025 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -6,348 | $46.97 | $298k | 319,241 | Apr 24, 2025 |
| Apr 15, 2025 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -10,000 | $47.79 | $478k | 326,844 | Apr 16, 2025 |
| Apr 8, 2025 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -10,000 | $46.81 | $468k | 336,844 | Apr 8, 2025 |
| Apr 1, 2025 | RMBS RAMBUS INC | AGrant or award Common Stock10b5-1 | +55,077 | $0.00 | $0 | 362,008 | Apr 3, 2025 |
| Apr 1, 2025 | RMBS RAMBUS INC | FTax withholding Common Stock10b5-1 | -5,164 | $52.29 | $270k | 356,844 | Apr 3, 2025 |
| Apr 1, 2025 | RMBS RAMBUS INC | SOpen-market sale Common Stock10b5-1 | -10,000 | $50.88 | $509k | 346,844 | Apr 3, 2025 |
Questions about Luc Seraphin
Answered from the filings on this page, as of the latest one.
Is Luc Seraphin buying or selling?
In the last 12 months Luc Seraphin reported 0 open-market buys worth $0 and 2 open-market sells worth $4.4M on SEC Form 4; the latest was sold $470k of RMBS on Apr 2, 2026. Grants, option exercises and tax withholding are not counted.
How did Luc Seraphin's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Luc Seraphin has 0.
Where does Luc Seraphin file Form 4?
Luc Seraphin has filed Form 4 at RMBS (RAMBUS INC) as President and CEO. 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.