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RMBS · Rambus Inc
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RMBS Rambus (RMBS) Insider Trading, Ownership & Congress Trades

Semiconductors & Electronics · Semiconductors & related devices · CIK 0000917273
Quote by TradingView
Form 144 · 3
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
326
13F, latest reported quarter

What the filings say about RMBS

Insiders, 180 days
-$12.9M net sold
7 sellers · 15% of sales under a 10b5-1 plan
Planned sales (Form 144), 90 days
$1.6M
3 notices

Rambus insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, RAMBUS INC insiders sold a net $12.9M of stock across 135 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.

Insider
Filed
Shares
Value
Since filing
KISSNER CHARLES
Director
SELL
2026-10-05 SECtraded 2026-10-02
5,000
$555.0K
-24.9%
Context
  • 6 earlier Form 4 trades (code P or S) here by this insider (6 sales), the last on Sep 22, 2026.
  • The trade is 133.4% of the 3,747 shares held after it.
  • No other insider sold within 30 days.
  • 326 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director KISSNER CHARLES sold about $555.0K of RMBS under a 10b5-1 plan on Oct 2, 2026; 326 funds added in the latest 13F quarter.
KISSNER CHARLES
Director
SELL
2026-09-24 SECtraded 2026-09-22
5,000
$525.0K
-18.6%
Context
  • 5 earlier Form 4 trades (code P or S) here by this insider (5 sales), the last on Aug 7, 2026.
  • The trade is 57.2% of the 8,747 shares held after it.
  • No other insider sold within 30 days.
  • 326 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director KISSNER CHARLES sold about $525.0K of RMBS under a 10b5-1 plan on Sep 22, 2026; 326 funds added in the latest 13F quarter.
KISSNER CHARLES
Director
SELL
2026-08-10 SECtraded 2026-08-07
5,000
$504.6K
-11.2%
Context
  • 4 earlier Form 4 trades (code P or S) here by this insider (4 sales), the last on May 9, 2022.
  • The trade is 36.4% of the 13,747 shares held after it.
  • No other insider sold within 30 days.
  • 326 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director KISSNER CHARLES sold about $504.6K of RMBS on Aug 7, 2026; 326 funds added in the latest 13F quarter.
Sayiner Necip
Director
SELL
2026-06-03 SEC
5,000
$850.8K
-49.4%
Context
  • 7 earlier Form 4 trades (code P or S) here by this insider (7 sales), the last on May 8, 2026.
  • The trade is 27.4% of the 18,223 shares held after it.
  • 5 other insiders sold within 30 days.
  • 326 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Sayiner Necip sold about $850.8K of RMBS on Jun 3, 2026; 5 other insiders sold within 30 days and 326 funds added in the latest 13F quarter.
Higashi Emiko
Director
SELL
2026-06-03 SECtraded 2026-06-02
5,000
$790.0K
-49.4%
Context
  • 4 earlier Form 4 trades (code P or S) here by this insider (4 sales), the last on May 26, 2026.
  • The trade is 10.1% of the 49,519 shares held after it.
  • 5 other insiders sold within 30 days.
  • 326 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Higashi Emiko sold about $790.0K of RMBS on Jun 2, 2026; 5 other insiders sold within 30 days and 326 funds added in the latest 13F quarter.
135 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
See all insider buying · insider selling
Showing the latest few. to see 130 more transactions and use the screener and CSV export. We store only your email; there is no password.
Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net -$12.9M over 180 days
-$1.6M over 90 days
below 66% of Semiconductors & Electronics
Congress
no House purchase disclosed in the last 12 months
Funds
326 funds bought in last quarter
more than 77% of Semiconductors & Electronics
Revenue
+27.1% year over year
more than 70% of Semiconductors & Electronics
Margin
32.6% net margin
more than 95% of Semiconductors & Electronics
Buybacks
$2.6M repurchased, FY to 2026-03-31
below 82% of Semiconductors & Electronics
Short interest
4.5% of the float short (float per yahoo 2026-10-26) · 1.4 days to cover · settled 2026-09-30
below 53% of Semiconductors & Electronics
What changed in the last 30 days
Oct 5Director KISSNER CHARLES sold $555.0K under a 10b5-1 plan (Oct 2)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.
Oct 2Director KISSNER CHARLES filed to sell $555.0K by Oct 2 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.

Watch RMBS

A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.

The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
-9.3%12M
-16%+17%+49%+81%2025-102025-122026-022026-042026-062026-082026-10 2026-05-26 · FAN XIANZHI SEAN sold $5.7M2026-03-02 · Seraphin Luc sold $1.3M2026-05-08 · Sayiner Necip sold $1.3M2026-04-14 · Rao Meera sold $1.0M2026-03-02 · Seraphin Luc sold $939.0K2026-06-03 · Sayiner Necip sold $850.8K2026-06-02 · Higashi Emiko sold $815.0K2026-06-02 · Higashi Emiko sold $790.0K2026-05-26 · Higashi Emiko sold $787.9K2026-06-01 · STANG ERIC B sold $730.0K2026-03-02 · Seraphin Luc sold $703.6K2026-03-02 · Seraphin Luc sold $660.0K2026-10-02 · KISSNER CHARLES sold $555.0K2026-09-22 · KISSNER CHARLES sold $525.0K2025-11-07 · STANG ERIC B sold $511.8K2026-08-07 · KISSNER CHARLES sold $504.6K2025-11-10 · STANG ERIC B sold $447.2K2026-04-24 · Rao Meera sold $446.7K2026-02-23 · Lynch Desmond sold $433.8K2026-03-10 · Shinn John sold $386.1K2026-04-02 · Seraphin Luc sold $239.6K2026-04-02 · Seraphin Luc sold $216.0K2026-03-03 · Shinn John sold $209.1K2026-05-07 · LAUB STEVEN sold $188.3K2026-03-02 · Seraphin Luc sold $160.9K2026-03-03 · Shinn John sold $150.8K2026-05-22 · Shinn John sold $143.6K2026-03-02 · Seraphin Luc sold $132.1K2026-03-03 · Shinn John sold $66.4K2026-03-10 · Shinn John sold $17.9K2026-05-26 · FAN XIANZHI SEAN sold $15.2K2026-04-02 · Seraphin Luc sold $14.6K2026-10-02 · KISSNER CHARLES filed to sell $555.0K2026-09-22 · KISSNER CHARLES filed to sell $525.0K2026-08-07 · KISSNER CHARLES filed to sell $504.6K
Insider sellForm 144 (planned sale)
Indexed to 100, dividend-adjusted, not a price chart. When a name files heavily, the largest trades are drawn first.

Who owns RMBS: institutional holders (13F)

13F holdings, latest reported quarter
BlackRock, Inc.
13,964,477 sh
$1.9B
FMR LLC
10,460,026 sh
$1.4B
Invesco Ltd.
6,632,458 sh
$880.4M
VANGUARD PORTFOLIO MANAGEMENT LLC
6,068,516 sh
$805.5M
VANGUARD CAPITAL MANAGEMENT LLC
4,874,385 sh
$647.0M

Congress trades in RMBS

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.

RMBS planned insider sales (Form 144)

Notice of intent to sell, filed before any sale
KISSNER CHARLES
Filed 2026-10-02
$555.0K
KISSNER CHARLES
Filed 2026-09-22
$525.0K
KISSNER CHARLES
Filed 2026-08-07
$504.6K

RMBS mutual fund holders (N-PORT)

Funds ranked by the share of their own portfolio in this stock (N-PORT).
Global X Internet of Things ETF
$12.2M position · as of 2026-05-31
4.9%
Tuttle Capital Concentrated Memory Stack ETF
$1.1M position · as of 2026-07-31
4.2%
VanEck Fabless Semiconductor ETF
$11.0M position · as of 2026-06-30
3.7%
Neuberger Small Cap Growth Fund
$23.6M position · as of 2026-05-31
3.4%
Invesco V.I. American Value Fund
$14.6M position · as of 2026-06-30
3.1%
Invesco Value Opportunities Portfolio
$18.7M position · as of 2026-06-30
2.9%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M · % is the share of the fund's own portfolio
Executive pay vs shareholder return · Luc Seraphin
CEO pay, headline and as actually paid, against the company's return and its chosen peers' (DEF 14A).
FY
CEO total
Actually paid
Other execs, avg
TSR
Peer TSR
2025
$9.5M
$35.7M
$3.6M
+426%
+377%
2024
$7.2M
-$5.1M
$2.6M
+284%
+391%
2023
$8.4M
$30.4M
$3.0M
+395%
+177%
2022
$7.1M
$19.4M
$3.2M
+160%
+37%
2021
$5.8M
$13.6M
$1.5M
+113%
+119%
Tagged by the company under SEC Item 402(v). Returns are cumulative from the start of the disclosure period. Green where the company beat its own peer group.
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders have filed to sell, before selling.
The record shows a net $12.9M sold by insiders over 180 days, 326 funds added last quarter, $1.6M in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
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RMBS financials

Revenue growth
+27.1%
XBRL, annual
Net margin
32.6%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$721.2M
four quarters, 2025-04-01 to 2026-03-31
Net margin, TTM
+31.9%
net income over revenue, 2025-04-01 to 2026-03-31
Free cash flow, TTM
$335.2M
operating cash flow minus capex, 2025-04-01 to 2026-03-31
Debt to equity
n/a
no debt line filed
Cash flow to debt
n/a
no debt line filed
Return on equity
+18.0%
TTM net income over average of 2025-03-31 and 2026-03-31
Return on assets
+15.8%
TTM net income over average of 2025-03-31 and 2026-03-31
Return on invested capital
n/a
no debt line filed
Return on capital employed
+18.9%
operating income (EBIT proxy) over average of 2025-03-31 and 2026-03-31 minus current liabilities
P/E, trailing
40.79x
close 2026-10-23 over four quarters of diluted EPS, 2025-04-01 to 2026-03-31
Enterprise value
n/a
no debt line filed
FCF yield
+3.6%
TTM free cash flow over market value at close 2026-10-23
PEG, trailing
4.10x
P/E over trailing EPS growth of 10%: four quarters to 2026-03-31 against the four to 2025-03-31
Price as of 2026-10-23. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
2025-122024-122023-122022-12
Revenue$707.6M$556.6M$461.1M$454.8M
Gross profit$563.2M$446.5M$357.7M$347.2M
Operating income$260.2M$183.0M$153.6M$76.9M
Net income$230.5M$179.8M$333.9M-$14.3M
EPS (diluted)2.111.653.01-0.13
Operating cash flow$360.0M$230.6M$195.8M$230.4M
Cash$182.8M$99.8M$94.8M$125.3M
Buybacks$7.1M$113.3M$100.5M$100.4M
SEC XBRL, fiscal years, as known on 2026-10-27

RMBS Stock Sonar score 5/7 axes

Find similar shapesCompare

RMBS ranks highest on profitability (85th percentile) and institutional and government (77th), and lowest on insider conviction (17th), among Semiconductors & Electronics peers.

ProfitGrowthInsidersInstitutionsRisk
Profitability
85
Inputs
  • Return on equity+18.0% · 77 pct, sector of 154
  • Return on assets+15.8% · 91 pct, sector of 171
  • Return on invested capitalno debt line filed
  • Return on capital employed+18.9% · 86 pct, sector of 155
Growth
67
Inputs
  • Revenue growth, YoY+27.1% · 70 pct, sector of 194
  • Backlog growth, YoY+19.3% · 64 pct, sector of 51
Insider conviction
17
Inputs
  • Net Form 4 buying (codes P and S), 180d-$11.8M · 34 pct, sector of 147
  • Insider buyers, 180d0 · 0 pct, sector of 151
Institutional and government
77
Inputs
  • Funds adding, latest quarter326 · 77 pct, sector of 184
  • Congress net buyers, 365dno Congress trades in 365 days
  • Federal contracts, 180dno federal contracts in 180 days
  • Lobbying spend, 4 quartersno lobbying filings in the last four quarters
Risk and compliance
66
Inputs
  • Short interest, % of float+4.5% · 57 pct, sector of 221
  • Recalls per $1B revenue, 3ynot measured for this sector, almost no peer has an event
  • EPA cases per $1B revenue, 5ynot measured for this sector, almost no peer has an event
  • New text in Risk Factors, latest 10-K+6.9% · 75 pct, sector of 152
2 not measured: Financial health, US patents
  • Financial health needs 1 of 2 inputs, 0 present: no debt line filed
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

5 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

RMBS filings, in plain words

Are Rambus insiders buying or selling RMBS?

In the 180 days to 2026-10-27, Rambus insiders were net sellers, a net $12.9M across purchases and sales reported on Form 4, by 7 sellers.

Are there planned insider sales of RMBS?

Yes. 3 Form 144 notices of planned insider sales were filed in the 90 days to 2026-10-27, covering $1.6M of stock; the latest, by KISSNER CHARLES, was filed 2026-10-02.

Read the full summary

In the 180 days to 2026-10-27, Rambus insiders were net sellers of RMBS, a net $12.9M across purchases and sales reported on Form 4 by 7 sellers. 15% of the 13 insider sales were made under a Rule 10b5-1 plan; the rest were not flagged as planned. Insiders filed 3 Form 144 notices of intent to sell in the 90 days to 2026-10-27, covering $1.6M of stock. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.

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