DOSSIER · 13F Holders · Q3 2026

LAM RESEARCH CORP

13 institutions still hold LAM RESEARCH CORP as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 512807956·13 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$1.5B
visible holders
Holders
13
filers reporting
Concentration
56.39%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q3 2026

13 institutions reported LAM RESEARCH CORP in Q3 2026. IMC-Chicago, LLC leads at 56.4% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$856M2.6M0.18%Q3 2026
02
Optiver Holding B.V.
CIK 0001859606· Market maker
$316M730K0.09%Q2 2026
03
GROUP ONE TRADING LLC
CIK 0000932540
$140M323K0.20%Q2 2026
04
SIMPLEX TRADING, LLC
CIK 0001488542
$109M333K0.06%Q3 2026
05
JPMORGAN CHASE & CO
CIK 0000019617
$72M174K0.00%Q2 2026
06
CMT Capital Markets Trading GmbH
CIK 0001632813
$11M53K0.12%Q1 2026
07
HRT FINANCIAL LP
CIK 0001475597
$6M37K0.02%Q4 2025
08
Maven Securities LTD
CIK 0001633046
$5M11K0.10%Q2 2026
09
Capital Markets Trading UK LLP
CIK 0001719165
$1M5K0.01%Q1 2026
10
Goldenstone Wealth Management LLC
CIK 0002109094
$913K1K0.57%Q3 2026
11
SG Americas Securities, LLC
CIK 0001313360
$106K55K0.00%Q1 2026
12
Atwater Malick LLC
CIK 0001769288
$28K30.01%Q3 2026
13
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025