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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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  1. Home/
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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 · 2024Q2
1 / 5
75 of 329
1
TSLATESLA INC
Consumer Cyclical·Auto Manufacturers
8.79%
of portfolio
Number of shares
15,516,436 sh
Holdings current value
$3.07B
Avg closing price
$304.15
+31.7%
Last action
Trimmed 0.1%
2025Q4
Current $400.62
2
G0450A105ARCH CAP GROUP LTD
6.04%
of portfolio
Number of shares
20,920,200 sh
Holdings current value
$2.11B
Avg closing price
$41.90
Last action
Trimmed 3.6%
2025Q4
Current —
3
ITGARTNER INC
Technology·Information Technology Services
5.38%
of portfolio
Number of shares
4,183,919 sh
Holdings current value
$1.88B
Avg closing price
$116.73
+32.5%
Last action
Trimmed 2.5%
2025Q4
Current $154.62
4
CSGPCOSTAR GROUP INC
Real Estate·Real Estate Services
4.09%
of portfolio
Number of shares
19,270,998 sh
Holdings current value
$1.43B
Avg closing price
$91.42
-56.6%
Last action
Added 1.3%
2025Q4
Current $39.72
5
FDSFACTSET RESH SYS INC
Financial Services·Financial Data & Stock Exchanges
3.10%
of portfolio
Number of shares
2,652,470 sh
Holdings current value
$1.08B
Avg closing price
$212.07
+9.7%
Last action
Added 67.6%
2025Q4
Current $232.73
6
MSCIMSCI INC
Financial Services·Financial Data & Stock Exchanges
3.06%
of portfolio
Number of shares
2,215,410 sh
Holdings current value
$1.07B
Avg closing price
$231.43
+145.7%
Last action
Added 19.5%
2025Q4
Current $568.55
7
IDXXIDEXX LABS INC
Healthcare·Diagnostics & Research
2.84%
of portfolio
Number of shares
2,035,337 sh
Holdings current value
$991.62M
Avg closing price
$104.10
+466.1%
Last action
Trimmed 4.1%
2025Q4
Current $589.25
8
MTNVAIL RESORTS INC
Consumer Cyclical·Resorts & Casinos
2.60%
of portfolio
Number of shares
5,048,808 sh
Holdings current value
$909.44M
Avg closing price
$152.03
-12.4%
Last action
Trimmed 15.0%
2025Q4
Current $133.22
9
GWREGUIDEWIRE SOFTWARE INC
Technology·Software - Application
2.42%
of portfolio
Number of shares
6,125,291 sh
Holdings current value
$844.62M
Avg closing price
$65.03
+115.8%
Last action
Trimmed 0.3%
2025Q4
Current $140.36
10
HHYATT HOTELS CORP
Consumer Cyclical·Lodging
2.36%
of portfolio
Number of shares
5,414,796 sh
Holdings current value
$822.62M
Avg closing price
$67.76
+154.5%
Last action
Trimmed 0.2%
2025Q4
Current $172.48
11
KNSLKINSALE CAP GROUP INC
Financial Services·Insurance - Property & Casualty
2.00%
of portfolio
Number of shares
1,816,122 sh
Holdings current value
$699.72M
Avg closing price
$84.46
+327.2%
Last action
Trimmed 0.4%
2025Q4
Current $360.78
12
RRRRED ROCK RESORTS INC
Consumer Cyclical·Resorts & Casinos
1.65%
of portfolio
Number of shares
10,516,775 sh
Holdings current value
$577.69M
Avg closing price
$33.63
+69.2%
Last action
Added 2.4%
2025Q4
Current $56.91
13
CHHCHOICE HOTELS INTL INC
Consumer Cyclical·Lodging
1.63%
of portfolio
Number of shares
4,770,041 sh
Holdings current value
$567.63M
Avg closing price
$73.55
+62.1%
Last action
Added 73.9%
2025Q4
Current $119.19
14
AKXANSYS INC
1.58%
of portfolio
Number of shares
1,715,443 sh
Holdings current value
$551.51M
Avg closing price
$102.95
Last action
Exited
2025Q3
Current —
15
SCHWSCHWAB CHARLES CORP
Financial Services·Capital Markets
1.56%
of portfolio
Number of shares
7,374,681 sh
Holdings current value
$543.44M
Avg closing price
$35.45
+160.3%
Last action
Trimmed 1.0%
2025Q4
Current $92.28
16
PRIPRIMERICA INC
Financial Services·Insurance - Life
1.25%
of portfolio
Number of shares
1,843,312 sh
Holdings current value
$436.09M
Avg closing price
$44.69
+510.7%
Last action
Trimmed 13.0%
2025Q4
Current $272.89
17
NVDANVIDIA CORPORATION
Technology·Semiconductors
1.19%
of portfolio
Number of shares
3,352,471 sh
Holdings current value
$414.16M
Avg closing price
$142.81
+41.2%
Last action
Added 0.1%
2025Q4
Current $201.68
18
MTDMETTLER TOLEDO INTERNATIONAL
Healthcare·Diagnostics & Research
1.18%
of portfolio
Number of shares
294,604 sh
Holdings current value
$411.74M
Avg closing price
$345.85
+287.6%
Last action
Trimmed 18.1%
2025Q4
Current $1341
19
MORNMORNINGSTAR INC
Financial Services·Financial Data & Stock Exchanges
1.11%
of portfolio
Number of shares
1,306,937 sh
Holdings current value
$386.66M
Avg closing price
$117.66
+56.6%
Last action
Trimmed 11.7%
2025Q4
Current $184.28
20
GLPIGAMING & LEISURE PPTYS INCREIT
Real Estate·REIT - Specialty
1.07%
of portfolio
Number of shares
8,248,597 sh
Holdings current value
$372.92M
Avg closing price
$32.44
+47.1%
Last action
Trimmed 28.5%
2025Q4
Current $47.73
21
VRSKVERISK ANALYTICS INC
Industrials·Consulting Services
1.00%
of portfolio
Number of shares
1,290,835 sh
Holdings current value
$347.94M
Avg closing price
$110.27
+61.5%
Last action
Added 6.7%
2025Q4
Current $178.07
22
TECHBIO-TECHNE CORP
Healthcare·Biotechnology
0.98%
of portfolio
Number of shares
4,776,592 sh
Holdings current value
$342.24M
Avg closing price
$87.15
-32.0%
Last action
Trimmed 21.2%
2025Q4
Current $59.23
23
VRTVERTIV HOLDINGS CO
Industrials·Electrical Equipment & Parts
0.94%
of portfolio
Number of shares
3,800,000 sh
Holdings current value
$328.97M
Avg closing price
$13.22
+2225.3%
Last action
Trimmed 12.1%
2025Q4
Current $307.34
24
G4705A100ICON PLC
0.87%
of portfolio
Number of shares
971,926 sh
Holdings current value
$304.67M
Avg closing price
$141.00
Last action
Trimmed 13.4%
2025Q4
Current —
25
IRDMIRIDIUM COMMUNICATIONS INC
Communication Services·Telecom Services
0.85%
of portfolio
Number of shares
11,182,841 sh
Holdings current value
$297.69M
Avg closing price
$18.33
+128.3%
Last action
Trimmed 4.1%
2025Q4
Current $41.85
26
SPOTSPOTIFY TECHNOLOGY S A
Communication Services·Internet Content & Information
0.80%
of portfolio
Number of shares
885,403 sh
Holdings current value
$277.83M
Avg closing price
$264.41
+102.9%
Last action
Added 1.0%
2025Q4
Current $536.61
27
MSFTMICROSOFT CORP
Technology·Software - Infrastructure
0.79%
of portfolio
Number of shares
620,929 sh
Holdings current value
$277.52M
Avg closing price
$231.09
+83.0%
Last action
Added 1.0%
2025Q4
Current $422.79
28
WSTWEST PHARMACEUTICAL SVSC INC
Healthcare·Medical Instruments & Supplies
0.72%
of portfolio
Number of shares
763,168 sh
Holdings current value
$251.38M
Avg closing price
$69.77
+292.3%
Last action
Trimmed 4.7%
2025Q4
Current $273.73
29
AMZNAMAZON COM INC
Consumer Cyclical·Internet Retail
0.60%
of portfolio
Number of shares
1,081,880 sh
Holdings current value
$209.07M
Avg closing price
$201.71
+24.2%
Last action
Added 15.7%
2025Q4
Current $250.56
30
ASGNASGN INC
Technology·Information Technology Services
0.54%
of portfolio
Number of shares
2,127,200 sh
Holdings current value
$187.56M
Avg closing price
$80.58
-51.1%
Last action
Trimmed 0.5%
2025Q4
Current $39.44
31
TTDTHE TRADE DESK INC
Communication Services·Advertising Agencies
0.53%
of portfolio
Number of shares
1,880,288 sh
Holdings current value
$183.65M
Avg closing price
$69.39
-67.6%
Last action
Trimmed 40.9%
2025Q4
Current $22.47
32
BFAMBRIGHT HORIZONS FAM SOL IN D
Consumer Cyclical·Personal Services
0.52%
of portfolio
Number of shares
1,635,596 sh
Holdings current value
$180.05M
Avg closing price
$74.96
+13.1%
Last action
Added 4.8%
2025Q4
Current $84.76
33
SITESITEONE LANDSCAPE SUPPLY INC
Industrials·Industrial Distribution
0.50%
of portfolio
Number of shares
1,451,090 sh
Holdings current value
$176.18M
Avg closing price
$94.03
+53.5%
Last action
Added 4.4%
2025Q4
Current $144.35
34
DAYCERIDIAN HCM HLDG INC
0.50%
of portfolio
Number of shares
3,533,774 sh
Holdings current value
$175.28M
Avg closing price
$45.74
+52.7%
Last action
Exited
2025Q4
Current $69.86
35
HLIHOULIHAN LOKEY INC
Financial Services·Capital Markets
0.50%
of portfolio
Number of shares
1,293,279 sh
Holdings current value
$174.41M
Avg closing price
$46.69
+248.1%
Last action
Trimmed 0.5%
2025Q4
Current $162.50
36
GTLSCHART INDS INC
Industrials·Specialty Industrial Machinery
0.50%
of portfolio
Number of shares
1,203,963 sh
Holdings current value
$173.78M
Avg closing price
$139.72
+49.1%
Last action
Exited
2025Q3
Current $208.30
37
SHOPSHOPIFY INC
Technology·Software - Application
0.49%
of portfolio
Number of shares
2,598,919 sh
Holdings current value
$171.66M
Avg closing price
$100.58
+30.4%
Last action
Added 0.1%
2025Q4
Current $131.15
38
FICOFAIR ISAAC CORP
Technology·Software - Application
0.49%
of portfolio
Number of shares
114,783 sh
Holdings current value
$170.87M
Avg closing price
$384.07
+179.5%
Last action
Trimmed 5.9%
2025Q4
Current $1074
39
TREXTREX CO INC
Industrials·Building Products & Equipment
0.48%
of portfolio
Number of shares
2,271,388 sh
Holdings current value
$168.36M
Avg closing price
$65.01
-34.2%
Last action
Exited
2025Q4
Current $42.77
40
FNDFLOOR & DECOR HLDGS INC
Consumer Cyclical·Home Improvement Retail
0.48%
of portfolio
Number of shares
1,678,484 sh
Holdings current value
$166.86M
Avg closing price
$60.90
-11.2%
Last action
Trimmed 9.3%
2025Q4
Current $54.07
41
M2029K104BIRKENSTOCK HOLDING PLC
0.47%
of portfolio
Number of shares
3,024,414 sh
Holdings current value
$164.56M
Avg closing price
$46.40
Last action
Added 114.2%
2025Q4
Current —
42
TSMTAIWAN SEMICONDUCTOR MFG LTDADR
Technology·Semiconductors
0.45%
of portfolio
Number of shares
897,650 sh
Holdings current value
$156.02M
Avg closing price
$96.33
+284.6%
Last action
Added 3.3%
2025Q4
Current $370.50
43
CPNGCOUPANG INC
Consumer Cyclical·Internet Retail
0.44%
of portfolio
Number of shares
7,392,395 sh
Holdings current value
$154.87M
Avg closing price
$17.00
+26.7%
Last action
Trimmed 0.4%
2025Q4
Current $21.55
44
ROPROPER TECHNOLOGIES INC
Technology·Software - Application
0.43%
of portfolio
Number of shares
263,997 sh
Holdings current value
$148.80M
Avg closing price
$214.42
+69.0%
Last action
Trimmed 6.6%
2025Q4
Current $362.44
45
CNSCOHEN & STEERS INC
Financial Services·Asset Management
0.42%
of portfolio
Number of shares
2,043,035 sh
Holdings current value
$148.24M
Avg closing price
$49.54
+34.6%
Last action
Trimmed 43.3%
2025Q4
Current $66.67
46
EQIXEQUINIX INCREIT
Real Estate·REIT - Specialty
0.41%
of portfolio
Number of shares
191,220 sh
Holdings current value
$144.68M
Avg closing price
$693.09
+57.1%
Last action
Trimmed 14.7%
2025Q4
Current $1089
47
METAMETA PLATFORMS INC
Communication Services·Internet Content & Information
0.41%
of portfolio
Number of shares
286,143 sh
Holdings current value
$144.28M
Avg closing price
$244.55
+181.6%
Last action
Added 1.8%
2025Q4
Current $688.55
48
FIGSFIGS INC
Consumer Cyclical·Apparel Manufacturing
0.41%
of portfolio
Number of shares
26,687,323 sh
Holdings current value
$142.24M
Avg closing price
$7.14
+126.4%
Last action
Added 0.1%
2025Q4
Current $16.17
49
IBPINSTALLED BLDG PRODS INC
Consumer Cyclical·Residential Construction
0.39%
of portfolio
Number of shares
661,043 sh
Holdings current value
$135.96M
Avg closing price
$83.49
+256.5%
Last action
Trimmed 5.0%
2025Q4
Current $297.64
50
ALTREURALTAIR ENGR INC
0.39%
of portfolio
Number of shares
1,385,507 sh
Holdings current value
$135.89M
Avg closing price
$24.14
Last action
Exited
2025Q1
Current —
51
TDGTRANSDIGM GROUP INC
Industrials·Aerospace & Defense
0.37%
of portfolio
Number of shares
100,000 sh
Holdings current value
$127.76M
Avg closing price
$310.31
+307.9%
Last action
Trimmed 4.2%
2025Q4
Current $1266
52
APHAMPHENOL CORP NEW
Technology·Electronic Components
0.36%
of portfolio
Number of shares
1,864,568 sh
Holdings current value
$125.62M
Avg closing price
$75.33
+100.5%
Last action
Trimmed 8.7%
2025Q4
Current $151.06
53
TOLTOLL BROTHERS INC
Consumer Cyclical·Residential Construction
0.36%
of portfolio
Number of shares
1,077,864 sh
Holdings current value
$124.15M
Avg closing price
$89.29
+64.3%
Last action
Added 0.9%
2025Q4
Current $146.68
54
H5919C104ON HLDG AG
0.35%
of portfolio
Number of shares
3,186,882 sh
Holdings current value
$123.65M
Avg closing price
$35.38
Last action
Added 26.1%
2025Q4
Current —
55
AREALEXANDRIA REAL ESTATE EQ INREIT
Real Estate·REIT - Office
0.35%
of portfolio
Number of shares
1,045,230 sh
Holdings current value
$122.26M
Avg closing price
$108.58
-55.2%
Last action
Exited
2025Q4
Current $48.63
56
BWINBRP GROUP INC
Financial Services·Insurance Brokers
0.33%
of portfolio
Number of shares
3,260,000 sh
Holdings current value
$115.63M
Avg closing price
$18.30
+36.9%
Last action
Added 0.0%
2025Q4
Current $25.04
57
NEOGNEOGEN CORP
Healthcare·Medical Devices
0.32%
of portfolio
Number of shares
7,205,048 sh
Holdings current value
$112.61M
Avg closing price
$23.50
-59.5%
Last action
Trimmed 15.7%
2025Q4
Current $9.51
58
ARGXARGENX SEADR
Healthcare·Biotechnology
0.32%
of portfolio
Number of shares
261,478 sh
Holdings current value
$112.45M
Avg closing price
$243.37
+248.9%
Last action
Trimmed 5.1%
2025Q4
Current $849.04
59
DXCMDEXCOM INC
Healthcare·Medical Devices
0.31%
of portfolio
Number of shares
966,472 sh
Holdings current value
$109.58M
Avg closing price
$82.47
-22.4%
Last action
Trimmed 1.5%
2025Q4
Current $63.98
60
DNUTKRISPY KREME INC
Consumer Defensive·Grocery Stores
0.31%
of portfolio
Number of shares
10,055,689 sh
Holdings current value
$108.20M
Avg closing price
$12.64
-71.4%
Last action
Exited
2025Q2
Current $3.61
61
AMTAMERICAN TOWER CORP NEWREIT
Real Estate·REIT - Specialty
0.30%
of portfolio
Number of shares
542,487 sh
Holdings current value
$105.45M
Avg closing price
$214.39
-14.9%
Last action
Trimmed 32.9%
2025Q4
Current $182.36
62
LENLENNAR CORP
Consumer Cyclical·Residential Construction
0.30%
of portfolio
Number of shares
693,189 sh
Holdings current value
$103.89M
Avg closing price
$97.47
-4.8%
Last action
Exited
2025Q2
Current $92.79
63
INTAINTAPP INC
Technology·Software - Application
0.30%
of portfolio
Number of shares
2,816,046 sh
Holdings current value
$103.26M
Avg closing price
$37.65
-39.4%
Last action
Added 18.9%
2025Q4
Current $22.82
64
AZPN1USDASPEN TECHNOLOGY INC
0.30%
of portfolio
Number of shares
519,463 sh
Holdings current value
$103.18M
Avg closing price
$237.46
Last action
Exited
2025Q1
Current —
65
CRWDCROWDSTRIKE HLDGS INC
Technology·Software - Infrastructure
0.29%
of portfolio
Number of shares
268,697 sh
Holdings current value
$102.96M
Avg closing price
$212.23
+99.8%
Last action
Added 6.0%
2025Q4
Current $423.95
66
CBRECBRE GROUP INC
Real Estate·Real Estate Services
0.29%
of portfolio
Number of shares
1,133,993 sh
Holdings current value
$101.05M
Avg closing price
$71.78
+111.1%
Last action
Trimmed 0.3%
2025Q4
Current $151.51
67
CWANCLEARWATER ANALYTICS HLDGS I
Technology·Software - Application
0.28%
of portfolio
Number of shares
5,324,656 sh
Holdings current value
$98.61M
Avg closing price
$20.56
+17.2%
Last action
Added 2.7%
2025Q4
Current $24.11
68
EQREQUITY RESIDENTIALREIT
Real Estate·REIT - Residential
0.28%
of portfolio
Number of shares
1,416,757 sh
Holdings current value
$98.24M
Avg closing price
$67.25
-6.8%
Last action
Added 9.6%
2025Q4
Current $62.68
69
MELIMERCADOLIBRE INC
Consumer Cyclical·Internet Retail
0.28%
of portfolio
Number of shares
59,711 sh
Holdings current value
$98.13M
Avg closing price
$1029
+80.4%
Last action
Trimmed 1.1%
2025Q4
Current $1856
70
PLNTPLANET FITNESS INC
Consumer Cyclical·Leisure
0.28%
of portfolio
Number of shares
1,325,000 sh
Holdings current value
$97.51M
Avg closing price
$47.13
+54.4%
Last action
Added 0.0%
2025Q3
Current $72.77
71
BABAALIBABA GROUP HLDG LTDADR
Consumer Cyclical·Internet Retail
0.28%
of portfolio
Number of shares
1,348,569 sh
Holdings current value
$97.10M
Avg closing price
$137.00
+2.9%
Last action
Added 5.3%
2025Q4
Current $141.01
72
IBKRINTERACTIVE BROKERS GROUP IN
Financial Services·Capital Markets
0.28%
of portfolio
Number of shares
784,968 sh
Holdings current value
$96.24M
Avg closing price
$63.76
+28.2%
Last action
Added 4.5%
2025Q4
Current $81.71
73
PDDPINDUODUO INCADR
Consumer Cyclical·Internet Retail
0.27%
of portfolio
Number of shares
706,102 sh
Holdings current value
$93.88M
Avg closing price
$122.25
-14.3%
Last action
Added 1.2%
2025Q3
Current $104.79
74
RBCRBC BEARINGS INC
Industrials·Tools & Accessories
0.27%
of portfolio
Number of shares
347,456 sh
Holdings current value
$93.74M
Avg closing price
$164.00
+259.6%
Last action
Trimmed 6.6%
2025Q4
Current $589.77
75
INDIINDIE SEMICONDUCTOR INC
Technology·Semiconductors
0.27%
of portfolio
Number of shares
15,151,425 sh
Holdings current value
$93.48M
Avg closing price
$6.27
-46.1%
Last action
Added 1.0%
2025Q4
Current $3.38

Portfolio heatmap

Box size = % of portfolio · color = return since filing
TSLA
8.79% · +102.5%
ARCH CAP GROUP LTD
6.04%
IT
5.38% · -65.6%
CSGP
4.09% · -46.4%
FDS
3.10% · -43.0%
MSCI
3.06% · +18.0%
IDXX
2.84% · +20.9%
MTN
2.60% · -26.0%
GWRE
2.42% · +1.8%
H
2.36% · +13.5%
KNSL
2.00% · -6.4%
RRR
1.65% · +3.6%
CHH
1.63% · +0.2%
AKX
1.58%
SCHW
1.56% · +25.2%
PRI
1.25% · +15.3%
NVDA
1.19% · +63.3%
MTD
1.18% · -4.1%
MORN
1.11% · -37.7%
GLPI
1.07% · +5.6%
VRSK
1.00% · -33.9%
TECH
0.98% · -17.3%
VRT
0.94% · +255.0%
ICON PLC
0.87%

Sector exposure

Share of dollar value across the latest reported portfolio. Unclassified positions excluded.
  • Consumer Cyclical42 pos$8.40B27.5%
  • Technology63 pos$6.39B20.9%
  • Financial Services35 pos$5.44B17.8%
  • Healthcare56 pos$3.25B10.6%
  • Real Estate30 pos$3.06B10.0%
  • Industrials32 pos$2.34B7.7%
  • Communication Services15 pos$1.22B4.0%
  • Basic Materials6 pos$236.5M0.8%
  • Consumer Defensive6 pos$189.0M0.6%
  • Energy1 pos$31K0.0%
(12.6% unclassified, excluded from %)