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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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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

Not enough filing history to compute mark-to-market returns for PRIMECAP Management.

We need at least one year of portfolio coverage with priceable positions.

Performance overview

We mark PRIMECAP Management's disclosed portfolio to current market prices and compare its growth against the S&P 500 (SPY). PRIMECAP’s portfolio is 41.7% since 2024Q1.

Portfolio growth vs SPY
Rebased to 100 at 2024Q1 · through 2025Q4
PRIMECAP Management
+53.3%
SPY
+33.2%
Alpha
+20.1pp
951111271421582024Q12024Q42025Q4
Portfolio line is the GIPS-compliant time-weighted return chain-linked across the manager's quarterly 13F filings — unaffected by capital flows. Quarters with insufficient held-through coverage are skipped, which can briefly flatten the line.
Capital flow per quarter
BuysSellsNet
+$6.52B+$3.26B$0-$3.26B-$6.52B'24Q2'24Q3'24Q4'25Q1
Latest · 2025Q1
-$4.34B
Lifetime buys
$12.29B
Lifetime sells
$21.89B
Portfolio over time
AUMPositions
$0$45.58B$91.16B$138.13B336329'24Q1'24Q3'25Q1
QoQ AUM
-6.3%
5Q lifetime AUM
-9.8%
QoQ positions
+6
5Q lifetime positions
+0
Position concentration
335 positions
Top 1
10%
of book
  • Top 110%$12.21BLLY
  • Top 2-512%$14.27BAMGN, BSX, MSFT
  • Top 6-1012%$14.40BMU, AZN, FDX
  • Top 11-2016%$19.91BTXN, SONY, NVDA
  • Rest50%$60.17BRest of port