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 2024Q1 — net new, added, trimmed, exited.
New positions17 names
- COOCOOPER COS INC+943,282$95.7M
- INTAINTAPP INC+2,583,231$88.6M
- MASIMASIMO CORP+345,800$50.8M
- TMETENCENT MUSIC ENTMT GROUP+3,651,224$40.9M
- ALABASTERA LABS INC+500,000$37.1M
- EXPOEXPONENT INC+313,262$25.9M
- RDDTREDDIT INC+300,000$14.8M
- CDNACAREDX INC+1,229,900$13.0M
- PKPARK HOTELS & RESORTS INC+318,724$5.6M
- IRTCIRHYTHM TECHNOLOGIES INC+45,000$5.2M
- MACMACERICH CO+255,558$4.4M
- TPHTRI POINTE HOMES INC+85,220$3.3M
- + 5 more…
Added to102 names
- SPOTSPOTIFY TECHNOLOGY S A+190,931$50.4M
- PCORPROCORE TECHNOLOGIES INC+441,256$36.3M
- AVGOBROADCOM INC+23,796$31.5M
- VMCVULCAN MATLS CO+82,943$22.6M
- CWANCLEARWATER ANALYTICS HLDGS I+1,262,150$22.3M
- INDIINDIE SEMICONDUCTOR INC+3,121,255$22.1M
- MSFTMICROSOFT CORP+46,915$19.7M
- RHRH+53,395$18.6M
- G98239XP INC+681,273$17.5M
- HLTHILTON WORLDWIDE HLDGS INC+75,102$16.0M
- NCNONCINO INC+421,500$15.8M
- VKTXVIKING THERAPEUTICS INC+183,192$15.0M
- + 90 more…
Trimmed153 names
- VRTVERTIV HOLDINGS CO−1,900,000$155.2M
- TSMTAIWAN SEMICONDUCTOR MFG LTD−1,096,791$149.2M
- VACMARRIOTT VACATIONS WORLDWIDE−1,305,679$140.7M
- IDXXIDEXX LABS INC−195,066$105.3M
- NVDANVIDIA CORPORATION−110,715$100.0M
- PENNPENN NATL GAMING INC−4,789,345$87.2M
- TSLATESLA INC−490,694$86.3M
- ITGARTNER INC−175,459$83.6M
- AKXANSYS INC−231,030$80.2M
- AXNX*AXONICS INC−1,111,398$76.7M
- IRDMIRIDIUM COMMUNICATIONS INC−2,120,000$55.5M
- FNDFLOOR & DECOR HLDGS INC−425,360$55.1M
- + 141 more…
Exited15 names
- 216648COOPER COS INC−251,098$95.0M
- MKTXMARKETAXESS HLDGS INC−67,596$19.8M
- G21810CLARIVATE PLC−2,000,000$18.5M
- G85158STONECO LTD−626,634$11.3M
- QLYSQUALYS INC−46,222$9.1M
- G4740BICHOR HOLDINGS−231,384$7.8M
- EPAMEPAM SYS INC−25,263$7.5M
- GPCRSTRUCTURE THERAPEUTICS INC−118,333$4.8M
- VTRVENTAS INC−62,893$3.1M
- HUMHUMANA INC−5,425$2.5M
- VGTVANGUARD WORLD FDS−3,396$1.6M
- MRNAMODERNA INC−7,500$746K
- + 3 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