Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-19 · Built: 2026-10-19 · 中文

← United States · Coverage record

US · SEC FORM 4

RAMBUS INC

RMBS · Nasdaq · CIK 0000917273 · Technology · Semiconductors

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

16 Form 4 transaction lines observed in the same window
14 sales · 2 option, withholding, award, gift or other lines

Last qualifying purchaseNo qualifying purchase is present in the local Form 4 history.

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesModerate
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
KISSNER CHARLESDirector
▼▼▼
Sayiner NecipDirector
▼▼
Higashi EmikoDirector
▼▼
STANG ERIC BDirector
▼
FAN XIANZHI SEANEVP, COO
▼
Shinn JohnSVP, General Counsel
▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 3 additional owner(s) remain in Form 4 evidence.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot.—

Recent Form 4 activity

0Purchases
32Sales
30Other Form 4 lines
38SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING14 sale line(s) · context only
OTHER2 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
4,784,389
Previous report
6,222,309
Avg daily volume
3,297,398
Days to cover
1.4

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

No qualifying code P equity purchase is present in the local Form 4 history.

Form 4 evidence

62 transaction lines in the latest 365-day window; 369 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-02KISSNER CHARLESSale (S)Common Stock5,000USD 111.00USD 555,000SEC filing ↗
2026-09-22KISSNER CHARLESSale (S)Common Stock5,000USD 105.00USD 525,000SEC filing ↗
2026-08-07KISSNER CHARLESSale (S)Common Stock5,000USD 100.92USD 504,600SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-02KISSNER CHARLESSale (S)Common Stock5,000USD 111.00USD 555,000SEC filing ↗
2026-09-22KISSNER CHARLESSale (S)Common Stock5,000USD 105.00USD 525,000SEC filing ↗
2026-08-07KISSNER CHARLESSale (S)Common Stock5,000USD 100.92USD 504,600SEC filing ↗
2026-06-03Sayiner NecipSale (S)Common Stock5,000USD 170.15USD 850,750SEC filing ↗
2026-06-02Higashi EmikoSale (S)Common Stock10,000USD 160.50USD 1,605,000SEC filing ↗
2026-06-01STANG ERIC BSale (S)Common Stock5,000USD 146.00USD 730,000SEC filing ↗
2026-05-26Higashi EmikoSale (S)Common Stock5,000USD 157.57USD 787,850SEC filing ↗
2026-05-26FAN XIANZHI SEANSale (S)Common Stock37,914USD 151.69USD 5,751,241SEC filing ↗
2026-05-22Shinn JohnSale (S)Common Stock1,000USD 143.63USD 143,630SEC filing ↗
2026-05-08Sayiner NecipSale (S)Common Stock9,824USD 130.18USD 1,278,888SEC filing ↗
2026-05-07LAUB STEVENSale (S)Common Stock1,500USD 125.52USD 188,280SEC filing ↗
2026-05-01Gagneja SumeetAward / grant (A)Common Stock41,320USD 0.00USD 0SEC filing ↗
2026-04-24Rao MeeraSale (S)Common Stock2,972USD 150.30USD 446,692SEC filing ↗
2026-04-14Rao MeeraSale (S)Common Stock8,538USD 118.08USD 1,008,167SEC filing ↗
2026-04-03Allen John KTax withholding (F)Common Stock1,131USD 92.22USD 104,301SEC filing ↗
2026-04-02Seraphin LucSale (S)Common Stock5,426USD 86.65USD 470,177SEC filing ↗
2026-04-01Shinn JohnTax withholding (F)Common Stock1,913USD 89.95USD 172,074SEC filing ↗
2026-04-01Shinn JohnAward / grant (A)Common Stock5,558USD 0.00USD 0SEC filing ↗
2026-04-01Seraphin LucTax withholding (F)Common Stock12,561USD 89.95USD 1,129,862SEC filing ↗
2026-04-01Seraphin LucAward / grant (A)Common Stock32,684USD 0.00USD 0SEC filing ↗
2026-04-01Sayiner NecipAward / grant (A)Common Stock2,223USD 0.00USD 0SEC filing ↗
2026-04-01STANG ERIC BAward / grant (A)Common Stock2,223USD 0.00USD 0SEC filing ↗
2026-04-01Rao MeeraAward / grant (A)Common Stock2,223USD 0.00USD 0SEC filing ↗
2026-04-01PENG VICTORAward / grant (A)Common Stock2,223USD 0.00USD 0SEC filing ↗
2026-04-01LAUB STEVENAward / grant (A)Common Stock2,223USD 0.00USD 0SEC filing ↗
2026-04-01KISSNER CHARLESAward / grant (A)Common Stock2,223USD 0.00USD 0SEC filing ↗
2026-04-01Higashi EmikoAward / grant (A)Common Stock2,223USD 0.00USD 0SEC filing ↗
2026-04-01FAN XIANZHI SEANTax withholding (F)Common Stock9,916USD 89.95USD 891,944SEC filing ↗
2026-04-01FAN XIANZHI SEANAward / grant (A)Common Stock22,234USD 0.00USD 0SEC filing ↗
2026-04-01Allen John KTax withholding (F)Common Stock1,153USD 89.95USD 103,712SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-19
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerRMBS
CIK0000917273
SectorTechnology
IndustrySemiconductors Yahoo Finance
SEC SIC3674 Semiconductors & Related Devices
ExchangeNasdaq

Data coverage

Local Form 4 history369 transaction lines from 2020-01-29 to 2026-10-02
0 P purchase lines · 163 S sale lines · 206 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-19. Mapping status is an audit field and does not erase SEC filing evidence.