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Built from publicly disclosed institutional and insider activity. Informational purposes only - not investment advice.OpenStocks · v0.1
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  1. Home/
  2. Super Investors/
  3. PRIMECAP Management
  • Overview
  • Portfolio319
  • Performance8Q
  • Options
  • Activity2.2k
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PRIMECAP Management

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  • Asset Manager · CIK 0000763212
  • Mega-Fund

PRIMECAP Management, an asset manager overseeing $132.11B in disclosed equity holdings (SEC CIK 0000763212). The latest portfolio (2025Q4) discloses 319 positions across 11 sectors, with the largest positions in LLY, MU and GOOGL. On a mark-to-market basis the tracked portfolio has returned 41.7% since 2024Q1. OpenStocks tracks 8 consecutive quarterly snapshots for this manager — every position change, new entry, and exit is logged below.

Track PRIMECAP's filingsView holdings↓
Portfolio
$132.11B
Positions
319
Quarter
2025Q4
Filings tracked
8
Since filing+41.7%Full performance →
Quarter
2025Q42025Q32025Q22025Q12024Q42024Q32024Q22024Q1
Capital flow per quarter
BuysSellsNet
+$14.41B+$7.20B$0-$7.20B-$14.41B'24Q2'24Q3'24Q4'25Q1'25Q2'25Q3'25Q4
Latest · 2025Q4
-$10.77B
Lifetime buys
$24.75B
Lifetime sells
$59.50B

Quarter activity

What changed in 2025Q4 - net new, added, trimmed, exited.
New positions10 names
  • QQNITY ELECTRONICS INC
    +972,974
    $79.4M
  • BRKRBRUKER CORP
    +655,100
    $30.9M
  • VNOMVIPER ENERGY INC
    +692,100
    $26.7M
  • M2029KBIRKENSTOCK HOLDING PLC
    +386,800
    $15.8M
  • SYNASYNAPTICS INC
    +211,700
    $15.7M
  • SEPNSEPTERNA INC
    +546,100
    $15.2M
  • THGHANOVER INS GROUP INC
    +36,900
    $6.7M
  • LENZLENZ THERAPEUTICS INC
    +372,200
    $6.0M
  • SOLSSOLSTICE ADVANCED MATLS INC
    +119,750
    $5.8M
  • SAPSAP SE
    +11,000
    $2.7M
Added to60 names
  • NFLXNETFLIX INC
    +3,826,870
    $358.8M
  • AMZNAMAZON COM INC
    +1,542,950
    $356.1M
  • SNPSSYNOPSYS INC
    +647,700
    $304.2M
  • IEXIDEX CORP
    +1,496,207
    $266.2M
  • BAHBOOZ ALLEN HAMILTON HLDG COR
    +2,682,460
    $226.3M
  • SCHWSCHWAB CHARLES CORP
    +2,066,884
    $206.5M
  • BKBANK NEW YORK MELLON CORP
    +1,720,238
    $199.7M
  • MKTXMARKETAXESS HLDGS INC
    +944,830
    $171.3M
  • BMYBRISTOL-MYERS SQUIBB CO
    +2,781,230
    $150.0M
  • G54950LINDE PLC
    +349,700
    $149.1M
  • GKOSGLAUKOS CORP
    +1,123,140
    $126.8M
  • COPCONOCOPHILLIPS
    +1,226,455
    $114.8M
  • + 48 more…
Trimmed221 names
  • LLYLILLY ELI & CO
    −1,529,556
    $1.64B
  • MUMICRON TECHNOLOGY INC
    −4,860,499
    $1.39B
  • KLACKLA CORP
    −659,220
    $801.0M
  • CVXCHEVRON CORP NEW
    −4,037,474
    $615.4M
  • WFCWELLS FARGO CO NEW
    −6,566,583
    $612.0M
  • MSFTMICROSOFT CORP
    −1,101,785
    $532.8M
  • TERTERADYNE INC
    −1,834,698
    $355.1M
  • ORCLORACLE CORP
    −1,504,586
    $293.3M
  • NVDANVIDIA CORPORATION
    −1,538,080
    $286.9M
  • AZNASTRAZENECA PLC
    −2,942,710
    $270.5M
  • FDXFEDEX CORP
    −929,579
    $268.5M
  • AMGNAMGEN INC
    −802,630
    $262.7M
  • + 209 more…
Exited18 names
  • EAELECTRONIC ARTS INC
    −339,305
    $68.4M
  • GEGENERAL ELECTRIC CO
    −187,700
    $56.5M
  • VSCOVICTORIAS SECRET AND CO
    −1,855,400
    $50.4M
  • OPTUALTICE USA INC
    −4,869,860
    $11.7M
  • AMHAMERICAN HOMES 4 RENT
    −242,300
    $8.1M
  • EPREPR PPTYS
    −91,000
    $5.3M
  • GTLSCHART INDS INC
    −17,000
    $3.4M
  • M85548STRATASYS LTD
    −165,100
    $1.8M
  • GLPGGALAPAGOS NV
    −50,500
    $1.7M
  • NRIXNURIX THERAPEUTICS INC
    −170,000
    $1.6M
  • WOLFWOLFSPEED INC
    −32,634
    $933K
  • KYNBFIBROGEN INC
    −58,879
    $721K
  • + 6 more…

Recent transactions

Last 20 moves
ADD
A
PRIMECAP Management added to AMZN
AMAZON COM INC
+1,542,950
~$230.82 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed AMGN
AMGEN INC
−802,630
~$327.31 · 2025Q4
2026-02-11
SOLD
O
PRIMECAP Management exited OPTU
ALTICE USA INC
−4,869,860
~$2.41 · 2025Q4
2026-02-11
TRIM
M
PRIMECAP Management trimmed MO
ALTRIA GROUP INC
−47,100
~$57.66 · 2025Q4
2026-02-11
SOLD
A
PRIMECAP Management exited AMH
AMERICAN HOMES 4 RENT
−242,300
~$33.25 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to AME
AMETEK INC
+4,000
~$205.31 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to ALLO
ALLOGENE THERAPEUTICS INC
+1,060,532
~$1.37 · 2025Q4
2026-02-11
TRIM
G
PRIMECAP Management trimmed GOOGL
ALPHABET INC
−648,925
~$313.00 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ALB
ALBEMARLE CORP
−450,840
~$141.44 · 2025Q4
2026-02-11
TRIM
B
PRIMECAP Management trimmed BABA
ALIBABA GROUP HLDG LTD
−1,010,730
~$146.58 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed AAL
AMERICAN AIRLS GROUP INC
−639,385
~$15.33 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to AMTM
AMENTUM HOLDINGS INC
+208,341
~$29.00 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ABT
ABBOTT LABS
−47,570
~$125.29 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to AMD
ADVANCED MICRO DEVICES INC
+427,689
~$214.16 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ADBE
ADOBE SYSTEMS INCORPORATED
−181,299
~$349.99 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ACM
AECOM
−211,080
~$95.33 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ALK
ALASKA AIR GROUP INC
−198,579
~$50.30 · 2025Q4
2026-02-11
TRIM
G
PRIMECAP Management trimmed GOOG
ALPHABET INC
−364,306
~$313.80 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed A
AGILENT TECHNOLOGIES INC
−75,270
~$136.07 · 2025Q4
2026-02-11
TRIM
F
PRIMECAP Management trimmed FOLD
AMICUS THERAPEUTICS INC
−78,500
~$14.24 · 2025Q4
2026-02-11