Asset Manager · CIK 0001017918
Ron Baron
Baron Capital / BAMCO
Ron Baron runs Baron Capital / BAMCO, an asset manager overseeing $36.91B in disclosed equity holdings (SEC CIK 0001017918). The latest portfolio (2025Q4) discloses 327 positions across 9 sectors, with the largest positions in TSLA, ARCH CAP GROUP LTD and MSCI. On a mark-to-market basis the tracked portfolio has returned 13.0% over the past year. OpenStocks tracks 40 consecutive quarterly snapshots for this manager — every position change, new entry, and exit is logged below.
Portfolio
$36.91B
Positions
327
Quarter
2025Q4
Filings tracked
40
Biggest winner since filing
TSLATESLA INC
+27.9%
+$1.01B
Biggest loser since filing
CSGPCOSTAR GROUP INC
-56.2%
−$1.00B
Investment strategy
Ron Baron is a large fund. Disclosed equity book is between $10B and $100B.
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<iframe src="https://openstocks.me/embed/stock/TSLA" width="100%" height="480" frameborder="0" loading="lazy" title="TSLA chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>Holdings
9 sectors327 positions
Top 3 = 23% of book · TSLA, ARCH CAP GRO, MSCI
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Performance
vs SPY40 quarters tracked
Mark-to-market portfolio growth vs SPY benchmark, with AUM and concentration history.
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Options & derivatives
No options
Ron Baron has no PUT or CALL positions disclosed for this quarter.
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Activity & trades
Quarter-by-quarterLast move 2025Q4
ADD PEN — and 4 more recent moves.
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Recent transactions
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SOLD
ALEXANDRIA REAL ESTATE EQ IN
−20,104
~$83.34 · 2025Q4
2026-02-17
ADD
AXON ENTERPRISE INC
+49,199
~$567.93 · 2025Q4
2026-02-17
ADD
CHOICE HOTELS INTL INC
+2,026,679
~$95.26 · 2025Q4
2026-02-17
SOLD
CIDARA THERAPEUTICS INC
−17,500
~$95.76 · 2025Q4
2026-02-17