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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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  3. PRIMECAP Management
  • Overview
  • Portfolio319
  • Performance8Q
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  • 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
+$12.74B+$6.37B$0-$6.37B-$12.74B'24Q2'24Q3'24Q4'25Q1'25Q2'25Q3
Latest · 2025Q3
-$9.39B
Lifetime buys
$21.11B
Lifetime sells
$45.09B

Quarter activity

What changed in 2025Q3 - net new, added, trimmed, exited.
New positions7 names
  • CVXCHEVRON CORP NEW
    +6,362,826
    $988.1M
  • HONHONEYWELL INTL INC
    +427,400
    $90.0M
  • TOSTTOAST INC
    +80,500
    $2.9M
  • TMHCTAYLOR MORRISON HOME CORP
    +44,400
    $2.9M
  • WOLFWOLFSPEED INC
    +32,634
    $933K
  • LESLLESLIES INC
    +65,556
    $361K
  • FIVEFIVE BELOW INC
    +1,300
    $201K
Added to60 names
  • AMZNAMAZON COM INC
    +3,172,900
    $696.7M
  • FICOFAIR ISAAC CORP
    +162,050
    $242.5M
  • COPCONOCOPHILLIPS
    +2,467,555
    $233.4M
  • SCHWSCHWAB CHARLES CORP
    +2,174,381
    $207.6M
  • IEXIDEX CORP
    +1,237,129
    $201.4M
  • MKTXMARKETAXESS HLDGS INC
    +891,303
    $155.3M
  • BAHBOOZ ALLEN HAMILTON HLDG COR
    +716,780
    $71.6M
  • DHRDANAHER CORPORATION
    +210,600
    $41.8M
  • CARRCARRIER GLOBAL CORPORATION
    +662,310
    $39.5M
  • AMDADVANCED MICRO DEVICES INC
    +227,310
    $36.8M
  • TDGTRANSDIGM GROUP INC
    +27,450
    $36.2M
  • GKOSGLAUKOS CORP
    +425,790
    $34.7M
  • + 48 more…
Trimmed232 names
  • LLYLILLY ELI & CO
    −1,359,570
    $1.04B
  • ORCLORACLE CORP
    −3,646,474
    $1.03B
  • KLACKLA CORP
    −945,095
    $1.02B
  • GOOGALPHABET INC
    −2,349,411
    $572.2M
  • XOMEXXON MOBIL CORP
    −3,616,965
    $407.8M
  • JPMJPMORGAN CHASE & CO
    −1,207,060
    $380.7M
  • MSFTMICROSOFT CORP
    −725,960
    $376.0M
  • MUMICRON TECHNOLOGY INC
    −1,810,441
    $302.9M
  • NVDANVIDIA CORPORATION
    −1,557,050
    $290.5M
  • WFCWELLS FARGO CO NEW
    −3,251,105
    $272.5M
  • AMGNAMGEN INC
    −924,100
    $260.8M
  • GOOGLALPHABET INC
    −971,080
    $236.1M
  • + 220 more…
Exited13 names
  • HESHESS CORP
    −7,652,265
    $1.06B
  • CHTRCHARTER COMMUNICATIONS INC N
    −143,490
    $58.7M
  • HUBSHUBSPOT INC
    −32,150
    $17.9M
  • SPHRMADISON SQUARE GRDN ENTERTNM
    −419,498
    $17.5M
  • SNDKSANDISK CORP
    −283,370
    $12.9M
  • GHGUARDANT HEALTH INC
    −65,990
    $3.4M
  • WOLF*WOLFSPEED INC
    −6,075,113
    $2.4M
  • FTNTFORTINET INC
    −7,000
    $740K
  • 527064LESLIES INC
    −1,311,130
    $551K
  • OSURORASURE TECHNOLOGIES INC
    −76,100
    $228K
  • NICENICE LTD
    −1,250
    $211K
  • JELDJELD-WEN HLDG INC
    −18,700
    $73K
  • + 1 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