Massivemarkets

SEC Form 4

Rambus Inc (RMBS) insider trading

In the 12 months to Oct 26, 2026, 10 RMBS insiders reported open-market sales of $21.0M across 19 filings; no open-market purchases were filed.

Latest filing · Last 12 months · Source: SEC EDGAR · How we count

Open-market sales
$21.0M
19 filings · 10 insiders
Open-market purchases
$0
0 filings
Pre-arranged sales (10b5-1)
10 of 19
$8.7M of $21.0M sold (41%)

Who traded RMBS, and when

  • Sale
  • Sale, pre-arranged (10b5-1)

RMBS daily close from Oct 27, 2025 to Oct 26, 2026, between $79.73 and $170.66, last $91.83. 19 sale and 0 purchase filings by 10 insiders, marked at their filing dates. Xianzhi Sean Fan, EVP, COO: sold $5.8M across 1 filing, first filed May 26, 2026, last May 26, 2026. Luc Seraphin, President and CEO: sold $4.4M across 2 filings, first filed Mar 3, 2026, last Apr 3, 2026. Emiko Higashi, Director: sold $2.4M across 2 filings, first filed May 27, 2026, last Jun 3, 2026. Necip Sayiner, Director: sold $2.1M across 2 filings, first filed May 11, 2026, last Jun 3, 2026. Eric B. Stang, Director: sold $1.7M across 2 filings, first filed Nov 12, 2025, last Jun 2, 2026. Charles Kissner, Director: sold $1.6M across 3 filings, first filed Aug 10, 2026, last Oct 5, 2026. 4 others: sold $3.1M across 7 filings, first filed Feb 24, 2026, last May 26, 2026.

Largest mark · tap a row for others

Xianzhi Sean Fan · EVP, COO

Sale $5,751,226

37,914 shares at $151.69 avg

Filed May 26, 2026

Close on filing date $157.23

RMBS daily closelast $91.83

Xianzhi Sean Fan · EVP, COO

$5.8M sold

Luc Seraphin · President and CEO

$4.4M sold

Emiko Higashi · Director

$2.4M sold

Necip Sayiner · Director

$2.1M sold

Eric B. Stang · Director

$1.7M sold

Charles Kissner · Director

$1.6M sold

4 others

$3.1M sold
One row per insider, smaller filers combined; marks sit at the SEC filing date, sized by dollar value.

Open-market trades

19 filings in the last 12 months
Other insider activity (not market trades) · 30 records
  • Tax withholding10 records
  • Grants and awards18 records
  • Gifts2 records

Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.

How to read this page

Open-market purchase or sale
A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
Pre-arranged (10b5-1)
The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
Filing date
Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.

Frequently asked questions

Has Rambus Inc's CEO sold stock?

Yes. Luc Seraphin (CEO) sold 45,340 shares ($4.4M) between Mar 2026 and Apr 2026, all under a pre-arranged 10b5-1 plan.

How current is RMBS’s insider data?

These are RMBS Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.

What counts as an open-market buy or sell?

Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.

Build with AI

Track RMBS insider trades with your agent

This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:

Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for RMBS every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.

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