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 13F filing (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 declined 7.8% over the past year. OpenStocks tracks 40 consecutive 13F filings for this manager — every position change, new entry, and exit is logged below.
Portfolio
$36.91B
Positions
327
Quarter
2025Q4
Filings tracked
40
Capital flow per quarter
BuysSellsNet
Latest · 2025Q4
-$342M
Lifetime buys
$21.59B
Lifetime sells
$28.45B
Quarter activity
What changed in 2025Q3 — net new, added, trimmed, exited.
New positions37 names
- AAONAAON INC+726,907$67.9M
- NTSKNETSKOPE INC+2,326,779$52.9M
- STUBSTUBHUB HLDGS INC+2,994,330$50.4M
- BMIBADGER METER INC+254,423$45.4M
- LGNLEGENCE CORP+1,392,531$42.9M
- HTFLHEARTFLOW INC+1,237,506$41.7M
- FIGFIGMA INC+750,000$38.9M
- SQMSOCIEDAD QUIMICA Y MINERA DE+600,938$25.8M
- METCRAMACO RES INC+623,058$20.7M
- G00894ACCELERANT HOLDINGS+1,218,309$18.1M
- VIAVIA TRANSN INC+333,384$16.0M
- ANETARISTA NETWORKS INC+97,965$14.3M
- + 25 more…
Added to135 names
- ITGARTNER INC+669,352$176.0M
- MSCIMSCI INC+223,784$127.0M
- LOARLOAR HOLDINGS INC+1,127,033$90.2M
- M2029KBIRKENSTOCK HOLDING PLC+1,876,398$84.9M
- DUOLDUOLINGO INC+169,049$54.4M
- PRMBPRIMO BRANDS CORPORATION+2,069,093$45.7M
- GDSGDS HLDGS LTD+1,104,756$42.8M
- CHHCHOICE HOTELS INTL INC+369,244$39.5M
- SPOTSPOTIFY TECHNOLOGY S A+51,372$35.9M
- ITGRINTEGER HLDGS CORP+343,797$35.5M
- MTNVAIL RESORTS INC+227,143$34.0M
- IRMIRON MTN INC NEW+329,307$33.6M
- + 123 more…
Trimmed115 names
- TSLATESLA INC−1,071,184$476.4M
- KTOSKRATOS DEFENSE & SEC SOLUTIO−2,151,380$196.6M
- IRDMIRIDIUM COMMUNICATIONS INC−7,694,981$134.4M
- DAYCERIDIAN HCM HLDG INC−1,907,428$131.4M
- FDSFACTSET RESH SYS INC−412,857$118.3M
- M2682VCYBERARK SOFTWARE LTD−221,322$106.9M
- GLPIGAMING & LEISURE PPTYS INC−2,221,809$103.6M
- GWREGUIDEWIRE SOFTWARE INC−420,669$96.7M
- IDXXIDEXX LABS INC−148,491$94.9M
- G0450AARCH CAP GROUP LTD−967,575$87.8M
- CGCARLYLE GROUP INC−1,325,709$83.1M
- VRTVERTIV HOLDINGS CO−499,957$75.4M
- + 103 more…
Exited13 names
- GTLSCHART INDS INC−885,306$145.8M
- AKXANSYS INC−194,552$68.3M
- LILI AUTO INC−361,861$9.8M
- L44385GLOBANT S A−80,866$7.3M
- WATWATERS CORP−14,000$4.9M
- PTLOPORTILLOS INC−384,549$4.5M
- ELMEWASHINGTON REAL ESTATE INVT−236,975$3.8M
- SGMLSIGMA LITHIUM CORPORATION−419,800$1.9M
- MNTNMNTN INC−70,000$1.5M
- RDDTREDDIT INC−9,697$1.5M
- ZTSZOETIS INC−5,000$780K
- G1151CACCENTURE PLC IRELAND−500$149K
- + 1 more…
Recent transactions
Last 20 moves
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
SOLD
COMMUNITY HEALTH SYS INC NEW
−100
~$3.21 · 2025Q4
2026-02-17
TRIM
KRATOS DEFENSE & SEC SOLUTIO
−723,116
~$75.91 · 2025Q4
2026-02-17
SOLD
LIBERTY MEDIA CORP DEL
−1,458,910
~$96.97 · 2025Q4
2026-02-17
ADD
MIRION TECHNOLOGIES INC
+150,000
~$23.42 · 2025Q4
2026-02-17
TRIM
WYNN RESORTS LTD
−118,268
~$120.33 · 2025Q4
2026-02-17
NEW
ISHARES TR
+51,896
~$74.94 · 2025Q4
2026-02-17
SOLD
JANUS INTERNATIONAL GROUP IN
−2,750,000
~$9.87 · 2025Q4
2026-02-17