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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. Ron Baron (Baron Capital / BAMCO)
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Asset Manager · CIK 0001017918

Ron Baron

Baron Capital / BAMCO
Share
  • Large Fund

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.

Track Ron's filingsView holdings↓
Portfolio
$36.91B
Positions
327
Quarter
2025Q4
Filings tracked
40
1Y+13.0%Since filing+110.9%Full performance →
Quarter
2025Q42025Q32025Q22025Q12024Q42024Q32024Q22024Q12023Q42023Q32023Q22023Q1

Holdings

Sorted by value · 2025Q3
1 / 5
75 of 330
1
TSLATESLA INC
Consumer Cyclical·Auto Manufacturers
14.09%
of portfolio
Number of shares
11,947,614 sh
Holdings current value
$5.31B
Avg closing price
$304.15
+31.7%
Last action
Trimmed 0.2%
2025Q4
Current $400.62
2
G0450A105ARCH CAP GROUP LTD
4.51%
of portfolio
Number of shares
18,759,655 sh
Holdings current value
$1.70B
Avg closing price
$41.90
Last action
Trimmed 4.0%
2025Q4
Current —
3
CSGPCOSTAR GROUP INC
Real Estate·Real Estate Services
4.31%
of portfolio
Number of shares
19,255,566 sh
Holdings current value
$1.62B
Avg closing price
$91.42
-56.6%
Last action
Added 1.3%
2025Q4
Current $39.72
4
MSCIMSCI INC
Financial Services·Financial Data & Stock Exchanges
3.60%
of portfolio
Number of shares
2,394,117 sh
Holdings current value
$1.36B
Avg closing price
$231.43
+145.7%
Last action
Added 17.8%
2025Q4
Current $568.55
5
IDXXIDEXX LABS INC
Healthcare·Diagnostics & Research
3.19%
of portfolio
Number of shares
1,884,129 sh
Holdings current value
$1.20B
Avg closing price
$104.10
+466.1%
Last action
Trimmed 4.4%
2025Q4
Current $589.25
6
GWREGUIDEWIRE SOFTWARE INC
Technology·Software - Application
3.15%
of portfolio
Number of shares
5,168,851 sh
Holdings current value
$1.19B
Avg closing price
$65.03
+115.8%
Last action
Trimmed 0.4%
2025Q4
Current $140.36
7
ITGARTNER INC
Technology·Information Technology Services
3.01%
of portfolio
Number of shares
4,322,113 sh
Holdings current value
$1.14B
Avg closing price
$116.73
+32.5%
Last action
Trimmed 2.5%
2025Q4
Current $154.62
8
HHYATT HOTELS CORP
Consumer Cyclical·Lodging
2.30%
of portfolio
Number of shares
6,116,673 sh
Holdings current value
$868.14M
Avg closing price
$67.76
+154.5%
Last action
Trimmed 0.2%
2025Q4
Current $172.48
9
MTNVAIL RESORTS INC
Consumer Cyclical·Resorts & Casinos
2.26%
of portfolio
Number of shares
5,702,692 sh
Holdings current value
$852.95M
Avg closing price
$152.03
-12.4%
Last action
Trimmed 13.5%
2025Q4
Current $133.22
10
KNSLKINSALE CAP GROUP INC
Financial Services·Insurance - Property & Casualty
2.02%
of portfolio
Number of shares
1,788,590 sh
Holdings current value
$760.62M
Avg closing price
$84.46
+327.2%
Last action
Trimmed 0.4%
2025Q4
Current $360.78
11
RRRRED ROCK RESORTS INC
Consumer Cyclical·Resorts & Casinos
1.99%
of portfolio
Number of shares
12,269,167 sh
Holdings current value
$749.16M
Avg closing price
$33.63
+69.2%
Last action
Added 2.1%
2025Q4
Current $56.91
12
SPOTSPOTIFY TECHNOLOGY S A
Communication Services·Internet Content & Information
1.83%
of portfolio
Number of shares
988,695 sh
Holdings current value
$690.11M
Avg closing price
$264.41
+102.9%
Last action
Added 0.9%
2025Q4
Current $536.61
13
SCHWSCHWAB CHARLES CORP
Financial Services·Capital Markets
1.81%
of portfolio
Number of shares
7,131,959 sh
Holdings current value
$680.89M
Avg closing price
$35.45
+160.3%
Last action
Trimmed 1.0%
2025Q4
Current $92.28
14
CHHCHOICE HOTELS INTL INC
Consumer Cyclical·Lodging
1.52%
of portfolio
Number of shares
5,359,896 sh
Holdings current value
$573.03M
Avg closing price
$73.55
+62.1%
Last action
Added 60.8%
2025Q4
Current $119.19
15
NVDANVIDIA CORPORATION
Technology·Semiconductors
1.48%
of portfolio
Number of shares
2,985,302 sh
Holdings current value
$557.00M
Avg closing price
$142.81
+41.2%
Last action
Added 0.1%
2025Q4
Current $201.68
16
FDSFACTSET RESH SYS INC
Financial Services·Financial Data & Stock Exchanges
1.38%
of portfolio
Number of shares
1,819,059 sh
Holdings current value
$521.14M
Avg closing price
$212.07
+9.7%
Last action
Added 142.8%
2025Q4
Current $232.73
17
FIGSFIGS INC
Consumer Cyclical·Apparel Manufacturing
1.06%
of portfolio
Number of shares
59,934,448 sh
Holdings current value
$400.96M
Avg closing price
$7.14
+126.4%
Last action
Added 0.0%
2025Q4
Current $16.17
18
PRIPRIMERICA INC
Financial Services·Insurance - Life
1.04%
of portfolio
Number of shares
1,408,241 sh
Holdings current value
$390.91M
Avg closing price
$44.69
+510.7%
Last action
Trimmed 16.4%
2025Q4
Current $272.89
19
SHOPSHOPIFY INC
Technology·Software - Application
0.90%
of portfolio
Number of shares
2,285,499 sh
Holdings current value
$339.65M
Avg closing price
$100.58
+30.4%
Last action
Added 0.1%
2025Q4
Current $131.15
20
MORNMORNINGSTAR INC
Financial Services·Financial Data & Stock Exchanges
0.87%
of portfolio
Number of shares
1,414,305 sh
Holdings current value
$328.13M
Avg closing price
$117.66
+56.6%
Last action
Trimmed 10.9%
2025Q4
Current $184.28
21
IBKRINTERACTIVE BROKERS GROUP IN
Financial Services·Capital Markets
0.84%
of portfolio
Number of shares
4,609,768 sh
Holdings current value
$317.20M
Avg closing price
$63.76
+28.2%
Last action
Added 0.7%
2025Q4
Current $81.71
22
VRTVERTIV HOLDINGS CO
Industrials·Electrical Equipment & Parts
0.83%
of portfolio
Number of shares
2,070,643 sh
Holdings current value
$312.38M
Avg closing price
$13.22
+2225.3%
Last action
Trimmed 20.2%
2025Q4
Current $307.34
23
VRSKVERISK ANALYTICS INC
Industrials·Consulting Services
0.81%
of portfolio
Number of shares
1,221,015 sh
Holdings current value
$307.10M
Avg closing price
$110.27
+61.5%
Last action
Added 7.2%
2025Q4
Current $178.07
24
M2029K104BIRKENSTOCK HOLDING PLC
0.76%
of portfolio
Number of shares
6,353,801 sh
Holdings current value
$287.51M
Avg closing price
$46.40
Last action
Added 34.0%
2025Q4
Current —
25
MTDMETTLER TOLEDO INTERNATIONAL
Healthcare·Diagnostics & Research
0.69%
of portfolio
Number of shares
211,352 sh
Holdings current value
$259.46M
Avg closing price
$345.85
+287.6%
Last action
Trimmed 23.5%
2025Q4
Current $1341
26
SITESITEONE LANDSCAPE SUPPLY INC
Industrials·Industrial Distribution
0.67%
of portfolio
Number of shares
1,966,876 sh
Holdings current value
$253.33M
Avg closing price
$94.03
+53.5%
Last action
Added 3.2%
2025Q4
Current $144.35
27
GLPIGAMING & LEISURE PPTYS INCREIT
Real Estate·REIT - Specialty
0.64%
of portfolio
Number of shares
5,143,996 sh
Holdings current value
$239.76M
Avg closing price
$32.44
+47.1%
Last action
Trimmed 39.0%
2025Q4
Current $47.73
28
AMZNAMAZON COM INC
Consumer Cyclical·Internet Retail
0.63%
of portfolio
Number of shares
1,078,312 sh
Holdings current value
$236.76M
Avg closing price
$201.71
+24.2%
Last action
Added 15.8%
2025Q4
Current $250.56
29
APHAMPHENOL CORP NEW
Technology·Electronic Components
0.62%
of portfolio
Number of shares
1,889,530 sh
Holdings current value
$233.83M
Avg closing price
$75.33
+100.5%
Last action
Trimmed 8.6%
2025Q4
Current $151.06
30
HLIHOULIHAN LOKEY INC
Financial Services·Capital Markets
0.62%
of portfolio
Number of shares
1,130,190 sh
Holdings current value
$232.05M
Avg closing price
$46.69
+248.1%
Last action
Trimmed 0.5%
2025Q4
Current $162.50
31
CBRECBRE GROUP INC
Real Estate·Real Estate Services
0.57%
of portfolio
Number of shares
1,362,985 sh
Holdings current value
$214.75M
Avg closing price
$71.78
+111.1%
Last action
Trimmed 0.3%
2025Q4
Current $151.51
32
WELLWELLTOWER INCREIT
Real Estate·REIT - Healthcare Facilities
0.56%
of portfolio
Number of shares
1,186,934 sh
Holdings current value
$211.44M
Avg closing price
$107.71
+95.5%
Last action
Added 8.3%
2025Q4
Current $210.52
33
H5919C104ON HLDG AG
0.53%
of portfolio
Number of shares
4,746,553 sh
Holdings current value
$201.02M
Avg closing price
$35.38
Last action
Added 16.1%
2025Q4
Current —
34
METAMETA PLATFORMS INC
Communication Services·Internet Content & Information
0.52%
of portfolio
Number of shares
265,135 sh
Holdings current value
$194.71M
Avg closing price
$244.55
+181.6%
Last action
Added 1.9%
2025Q4
Current $688.55
35
BABAALIBABA GROUP HLDG LTDADR
Consumer Cyclical·Internet Retail
0.48%
of portfolio
Number of shares
1,003,699 sh
Holdings current value
$179.39M
Avg closing price
$137.00
+2.9%
Last action
Added 7.3%
2025Q4
Current $141.01
36
KTOSKRATOS DEFENSE & SEC SOLUTIO
Industrials·Aerospace & Defense
0.47%
of portfolio
Number of shares
1,932,889 sh
Holdings current value
$176.61M
Avg closing price
$16.97
+318.3%
Last action
Trimmed 27.2%
2025Q4
Current $70.99
37
MSFTMICROSOFT CORP
Technology·Software - Infrastructure
0.46%
of portfolio
Number of shares
335,547 sh
Holdings current value
$173.80M
Avg closing price
$231.09
+83.0%
Last action
Added 1.9%
2025Q4
Current $422.79
38
WYNNWYNN RESORTS LTD
Consumer Cyclical·Resorts & Casinos
0.46%
of portfolio
Number of shares
1,337,858 sh
Holdings current value
$171.61M
Avg closing price
$88.16
+23.9%
Last action
Trimmed 8.1%
2025Q4
Current $109.19
39
KRMNKARMAN HLDGS INC
Industrials·Aerospace & Defense
0.45%
of portfolio
Number of shares
2,371,232 sh
Holdings current value
$171.20M
Avg closing price
$33.52
+149.3%
Last action
Trimmed 16.2%
2025Q4
Current $83.58
40
TSMTAIWAN SEMICONDUCTOR MFG LTDADR
Technology·Semiconductors
0.45%
of portfolio
Number of shares
605,912 sh
Holdings current value
$169.23M
Avg closing price
$96.33
+284.6%
Last action
Added 5.0%
2025Q4
Current $370.50
41
JLLJONES LANG LASALLE INC
Real Estate·Real Estate Services
0.45%
of portfolio
Number of shares
564,097 sh
Holdings current value
$168.26M
Avg closing price
$224.45
+54.3%
Last action
Added 0.0%
2025Q4
Current $346.43
42
GDSGDS HLDGS LTDADR
Technology·Information Technology Services
0.44%
of portfolio
Number of shares
4,258,664 sh
Holdings current value
$164.81M
Avg closing price
$22.66
+97.2%
Last action
Trimmed 10.0%
2025Q4
Current $44.70
43
BNBROOKFIELD CORP
Financial Services·Asset Management
0.44%
of portfolio
Number of shares
2,402,280 sh
Holdings current value
$164.75M
Avg closing price
$46.67
-0.2%
Last action
Added 105.6%
2025Q4
Current $46.59
44
AVGOBROADCOM INC
Technology·Semiconductors
0.44%
of portfolio
Number of shares
497,399 sh
Holdings current value
$164.10M
Avg closing price
$273.12
+48.8%
Last action
Added 8.9%
2025Q4
Current $406.54
45
TOLTOLL BROTHERS INC
Consumer Cyclical·Residential Construction
0.42%
of portfolio
Number of shares
1,156,885 sh
Holdings current value
$159.81M
Avg closing price
$89.29
+64.3%
Last action
Added 0.8%
2025Q4
Current $146.68
46
DKNGDRAFTKINGS INC NEW
Consumer Cyclical·Gambling
0.41%
of portfolio
Number of shares
4,105,968 sh
Holdings current value
$153.56M
Avg closing price
$28.01
-18.5%
Last action
Added 16.1%
2025Q4
Current $22.82
47
PWRQUANTA SVCS INC
Industrials·Engineering & Construction
0.39%
of portfolio
Number of shares
356,846 sh
Holdings current value
$147.88M
Avg closing price
$195.61
+207.7%
Last action
Trimmed 7.5%
2025Q4
Current $601.88
48
MELIMERCADOLIBRE INC
Consumer Cyclical·Internet Retail
0.39%
of portfolio
Number of shares
62,634 sh
Holdings current value
$146.37M
Avg closing price
$1029
+80.4%
Last action
Trimmed 1.1%
2025Q4
Current $1856
49
LOARLOAR HOLDINGS INC
Industrials·Aerospace & Defense
0.38%
of portfolio
Number of shares
1,809,099 sh
Holdings current value
$144.73M
Avg closing price
$77.22
-12.6%
Last action
Added 20.7%
2025Q4
Current $67.48
50
LLYVK*LIBERTY MEDIA CORP DELTRK
0.38%
of portfolio
Number of shares
1,458,910 sh
Holdings current value
$141.47M
Avg closing price
$46.06
Last action
Exited
2025Q4
Current —
51
EQIXEQUINIX INCREIT
Real Estate·REIT - Specialty
0.37%
of portfolio
Number of shares
178,348 sh
Holdings current value
$139.69M
Avg closing price
$693.09
+57.1%
Last action
Trimmed 15.6%
2025Q4
Current $1089
52
TECHBIO-TECHNE CORP
Healthcare·Biotechnology
0.37%
of portfolio
Number of shares
2,496,323 sh
Holdings current value
$138.87M
Avg closing price
$87.15
-32.0%
Last action
Trimmed 34.0%
2025Q4
Current $59.23
53
CPNGCOUPANG INC
Consumer Cyclical·Internet Retail
0.37%
of portfolio
Number of shares
4,305,895 sh
Holdings current value
$138.65M
Avg closing price
$17.00
+26.7%
Last action
Trimmed 0.7%
2025Q4
Current $21.55
54
CWANCLEARWATER ANALYTICS HLDGS I
Technology·Software - Application
0.37%
of portfolio
Number of shares
7,675,038 sh
Holdings current value
$138.30M
Avg closing price
$20.56
+17.2%
Last action
Added 1.9%
2025Q4
Current $24.11
55
RBCRBC BEARINGS INC
Industrials·Tools & Accessories
0.34%
of portfolio
Number of shares
327,649 sh
Holdings current value
$127.88M
Avg closing price
$164.00
+259.6%
Last action
Trimmed 7.0%
2025Q4
Current $589.77
56
IOTSAMSARA INC
Technology·Software - Infrastructure
0.33%
of portfolio
Number of shares
3,378,831 sh
Holdings current value
$125.86M
Avg closing price
$38.59
-20.7%
Last action
Added 28.1%
2025Q4
Current $30.62
57
ARGXARGENX SEADR
Healthcare·Biotechnology
0.33%
of portfolio
Number of shares
167,694 sh
Holdings current value
$123.68M
Avg closing price
$243.37
+248.9%
Last action
Trimmed 7.7%
2025Q4
Current $849.04
58
G4705A100ICON PLC
0.32%
of portfolio
Number of shares
684,941 sh
Holdings current value
$119.86M
Avg closing price
$141.00
Last action
Trimmed 18.0%
2025Q4
Current —
59
PLNTPLANET FITNESS INC
Consumer Cyclical·Leisure
0.32%
of portfolio
Number of shares
1,150,028 sh
Holdings current value
$119.37M
Avg closing price
$47.13
+54.4%
Last action
Added 0.0%
2025Q3
Current $72.77
60
INTAINTAPP INC
Technology·Software - Application
0.31%
of portfolio
Number of shares
2,880,950 sh
Holdings current value
$117.83M
Avg closing price
$37.65
-39.4%
Last action
Added 18.4%
2025Q4
Current $22.82
61
EXKEXACT SCIENCES CORP
Basic Materials·Silver
0.31%
of portfolio
Number of shares
2,139,050 sh
Holdings current value
$117.03M
Avg closing price
$48.03
-78.8%
Last action
Trimmed 35.6%
2025Q4
Current $10.18
62
FICOFAIR ISAAC CORP
Technology·Software - Application
0.30%
of portfolio
Number of shares
75,829 sh
Holdings current value
$113.48M
Avg closing price
$384.07
+179.5%
Last action
Trimmed 8.6%
2025Q4
Current $1074
63
CNSCOHEN & STEERS INC
Financial Services·Asset Management
0.30%
of portfolio
Number of shares
1,728,387 sh
Holdings current value
$113.40M
Avg closing price
$49.54
+34.6%
Last action
Trimmed 47.5%
2025Q4
Current $66.67
64
IBPINSTALLED BLDG PRODS INC
Consumer Cyclical·Residential Construction
0.30%
of portfolio
Number of shares
458,182 sh
Holdings current value
$113.02M
Avg closing price
$83.49
+256.5%
Last action
Trimmed 7.1%
2025Q4
Current $297.64
65
ROPROPER TECHNOLOGIES INC
Technology·Software - Application
0.30%
of portfolio
Number of shares
226,060 sh
Holdings current value
$112.73M
Avg closing price
$214.42
+69.0%
Last action
Trimmed 7.6%
2025Q4
Current $362.44
66
FNDFLOOR & DECOR HLDGS INC
Consumer Cyclical·Home Improvement Retail
0.30%
of portfolio
Number of shares
1,527,395 sh
Holdings current value
$112.57M
Avg closing price
$60.90
-11.2%
Last action
Trimmed 10.2%
2025Q4
Current $54.07
67
TDGTRANSDIGM GROUP INC
Industrials·Aerospace & Defense
0.29%
of portfolio
Number of shares
82,149 sh
Holdings current value
$108.27M
Avg closing price
$310.31
+307.9%
Last action
Trimmed 5.0%
2025Q4
Current $1266
68
PCORPROCORE TECHNOLOGIES INC
Technology·Software - Application
0.29%
of portfolio
Number of shares
1,480,776 sh
Holdings current value
$107.98M
Avg closing price
$72.79
-23.8%
Last action
Added 2.4%
2025Q4
Current $55.44
69
HEI/AHEICO CORP NEW
0.29%
of portfolio
Number of shares
424,729 sh
Holdings current value
$107.92M
Avg closing price
$126.14
Last action
Added 2.3%
2025Q4
Current —
70
BXBLACKSTONE INC
Financial Services·Asset Management
0.28%
of portfolio
Number of shares
616,242 sh
Holdings current value
$105.28M
Avg closing price
$119.44
+8.1%
Last action
Trimmed 5.6%
2025Q4
Current $129.08
71
AMTAMERICAN TOWER CORP NEWREIT
Real Estate·REIT - Specialty
0.27%
of portfolio
Number of shares
534,053 sh
Holdings current value
$102.71M
Avg closing price
$214.39
-14.9%
Last action
Trimmed 33.3%
2025Q4
Current $182.36
72
PLDPROLOGIS INC.REIT
Real Estate·REIT - Industrial
0.27%
of portfolio
Number of shares
891,522 sh
Holdings current value
$102.10M
Avg closing price
$113.96
+27.3%
Last action
Added 32.3%
2025Q4
Current $145.10
73
BFAMBRIGHT HORIZONS FAM SOL IN D
Consumer Cyclical·Personal Services
0.27%
of portfolio
Number of shares
938,962 sh
Holdings current value
$101.94M
Avg closing price
$74.96
+13.1%
Last action
Added 8.6%
2025Q4
Current $84.76
74
G25508105CRH PLC
0.27%
of portfolio
Number of shares
842,734 sh
Holdings current value
$101.04M
Avg closing price
$89.92
Last action
Added 0.2%
2025Q4
Current —
75
MRCYMERCURY SYS INC
Industrials·Aerospace & Defense
0.27%
of portfolio
Number of shares
1,295,284 sh
Holdings current value
$100.25M
Avg closing price
$50.22
+67.4%
Last action
Trimmed 26.2%
2025Q4
Current $84.05

Portfolio heatmap

Box size = % of portfolio · color = return since filing
TSLA
14.09% · -9.9%
ARCH CAP GROUP LTD
4.51%
CSGP
4.31% · -52.9%
MSCI
3.60% · +0.2%
IDXX
3.19% · -7.8%
GWRE
3.15% · -38.9%
IT
3.01% · -41.2%
H
2.30% · +21.5%
MTN
2.26% · -10.9%
KNSL
2.02% · -15.2%
RRR
1.99% · -6.8%
SPOT
1.83% · -23.1%
SCHW
1.81% · -3.3%
CHH
1.52% · +11.5%
NVDA
1.48% · +8.1%
FDS
1.38% · -18.8%
FIGS
1.06% · +141.7%
PRI
1.04% · -1.7%
SHOP
0.90% · -11.7%
MORN
0.87% · -20.6%
IBKR
0.84% · +18.7%
VRT
0.83% · +103.7%
VRSK
0.81% · -29.2%
BIRKENSTOCK HOLDING PLC
0.76%

Sector exposure

Share of dollar value across the latest reported portfolio. Unclassified positions excluded.
  • Consumer Cyclical37 pos$11.12B32.3%
  • Technology67 pos$6.85B19.9%
  • Financial Services41 pos$5.74B16.7%
  • Real Estate34 pos$3.36B9.8%
  • Healthcare60 pos$2.85B8.3%
  • Industrials35 pos$2.82B8.2%
  • Communication Services13 pos$1.36B4.0%
  • Basic Materials7 pos$284.3M0.8%
  • Consumer Defensive3 pos$57.8M0.2%
(8.6% unclassified, excluded from %)