Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

LAM RESEARCH CORP

LRCX · Nasdaq · CIK 0000707549 · Technology · Semiconductor Equipment & Materials

INSIDER SIGNAL

No active buy signal

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

62 Form 4 transaction lines observed in the same window
55 sales · 7 option, withholding, award, gift or other lines

Last qualifying purchase2025-04-08 · Harter Ava · $602

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
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.

Insider activity timeline

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

AprMayJunJulAugSepOct
ARCHER TIMOTHYPresident and CEO
○▼○▼○▼
Harter AvaChief Legal Officer
○▼○▼
BRANDT ERICDirector
▼▼
Fernandes Neil JSenior Vice President
▼▼
Varadarajan SeshasayeeSenior Vice President
○▼
Mayer BethanyDirector
▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 1 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

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

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-04-08 · Harter Ava.

Recent Form 4 activity

0Purchases
68Sales
76Other Form 4 lines
51SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING55 sale line(s) · context only
OTHER7 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
25,810,795
Previous report
26,081,081
Avg daily volume
9,844,598
Days to cover
2.6

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

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2025-04-08Harter AvaPurchase (P)Common Stock9USD 63.66USD 602SEC filing ↗
2022-04-26Lego Catherine PPurchase (P)Common Stock1,736USD 460.35USD 799,168SEC filing ↗

Form 4 evidence

144 transaction lines in the latest 365-day window; 844 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-09Mayer BethanySale (S)Common Stock9,557USD 314.74USD 3,007,970SEC filing ↗
2026-09-09ARCHER TIMOTHYSale (S)Common Stock30,000USD 319.26USD 9,577,800SEC filing ↗
2026-09-09ARCHER TIMOTHYOption exercise / conversion (M)Common Stock30,000USD 30.03USD 900,900SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-09Mayer BethanySale (S)Common Stock9,557USD 314.74USD 3,007,970SEC filing ↗
2026-09-09ARCHER TIMOTHYSale (S)Common Stock30,000USD 319.26USD 9,577,800SEC filing ↗
2026-09-09ARCHER TIMOTHYOption exercise / conversion (M)Common Stock30,000USD 30.03USD 900,900SEC filing ↗
2026-09-02Varadarajan SeshasayeeSale (S)Common Stock59,750USD 291.32USD 17,406,370SEC filing ↗
2026-09-02Varadarajan SeshasayeeOption exercise / conversion (M)Common Stock39,750USD 39.24USD 1,559,952SEC filing ↗
2026-08-31Harter AvaSale (S)Common Stock5,000USD 302.46USD 1,512,300SEC filing ↗
2026-08-06ARCHER TIMOTHYSale (S)Common Stock30,000USD 300.00USD 9,000,000SEC filing ↗
2026-08-06ARCHER TIMOTHYOption exercise / conversion (M)Common Stock30,000USD 30.03USD 900,900SEC filing ↗
2026-08-05Harter AvaTax withholding (F)Common Stock5,790USD 307.42USD 1,779,962SEC filing ↗
2026-07-13TALWALKAR ABHIJIT YSale (S)Common Stock18,282USD 335.00USD 6,124,470SEC filing ↗
2026-07-02ARCHER TIMOTHYSale (S)Common Stock30,000USD 390.01USD 11,700,300SEC filing ↗
2026-07-02ARCHER TIMOTHYOption exercise / conversion (M)Common Stock30,000USD 30.03USD 900,900SEC filing ↗
2026-06-12BRANDT ERICSale (S)Common Stock54,500USD 367.18USD 20,011,346SEC filing ↗
2026-06-11BRANDT ERICSale (S)Common Stock54,500USD 350.80USD 19,118,360SEC filing ↗
2026-06-01Fernandes Neil JSale (S)Common Stock7,659USD 309.60USD 2,371,226SEC filing ↗
2026-05-01Fernandes Neil JSale (S)Common Stock18,170USD 255.14USD 4,635,894SEC filing ↗
2026-04-27Harter AvaSale (S)Common Stock6,010USD 258.66USD 1,554,547SEC filing ↗
2026-04-27Harter AvaOption exercise / conversion (M)Common Stock6,010USD 77.04USD 463,010SEC filing ↗
2026-03-27Vahedi VahidTax withholding (F)Common Stock3,382USD 233.89USD 791,016SEC filing ↗
2026-03-27Harter AvaTax withholding (F)Common Stock3,199USD 233.89USD 748,214SEC filing ↗
2026-03-10TALWALKAR ABHIJIT YGift (G)Common Stock4,571USD 0.00USD 0SEC filing ↗
2026-03-04Harter AvaSale (S)Common Stock1,500USD 222.66USD 333,990SEC filing ↗
2026-03-04Bettinger Douglas RSale (S)Common Stock50,057USD 224.03USD 11,214,270SEC filing ↗
2026-03-04Bettinger Douglas ROption exercise / conversion (M)Common Stock77,750USD 65.80USD 5,115,856SEC filing ↗
2026-03-02Harter AvaSale (S)Common Stock4,000USD 232.50USD 930,000SEC filing ↗
2026-03-02Bettinger Douglas RSale (S)Common Stock40,329USD 230.22USD 9,284,542SEC filing ↗
2026-03-02Bettinger Douglas ROption exercise / conversion (M)Common Stock66,310USD 51.28USD 3,400,056SEC filing ↗
2026-02-27Varadarajan SeshasayeeTax withholding (F)Common Stock36,913USD 233.89USD 8,633,582SEC filing ↗
2026-02-27Varadarajan SeshasayeeAward / grant (A)Common Stock12,547USD 0.00USD 0SEC filing ↗
2026-02-27Vahedi VahidTax withholding (F)Common Stock29,592USD 233.89USD 6,921,273SEC 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 date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerLRCX
CIK0000707549
SectorTechnology
IndustrySemiconductor Equipment & Materials Yahoo Finance
SEC SIC3559 Special Industry Machinery, NEC
ExchangeNasdaq

Data coverage

Local Form 4 history844 transaction lines from 2020-01-02 to 2026-09-09
2 P purchase lines · 273 S sale lines · 569 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.