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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 · 2023Q4
1 / 5
75 of 330
1
TSLATESLA INC
Consumer Cyclical·Auto Manufacturers
11.72%
of portfolio
Number of shares
17,708,489 sh
Holdings current value
$4.40B
Avg closing price
$304.15
+31.7%
Last action
Trimmed 0.1%
2025Q4
Current $400.62
2
ITGARTNER INC
Technology·Information Technology Services
5.32%
of portfolio
Number of shares
4,426,192 sh
Holdings current value
$2.00B
Avg closing price
$116.73
+32.5%
Last action
Trimmed 2.4%
2025Q4
Current $154.62
3
CSGPCOSTAR GROUP INC
Real Estate·Real Estate Services
4.51%
of portfolio
Number of shares
19,391,283 sh
Holdings current value
$1.69B
Avg closing price
$91.42
-56.6%
Last action
Added 1.3%
2025Q4
Current $39.72
4
G0450A105ARCH CAP GROUP LTD
4.21%
of portfolio
Number of shares
21,292,042 sh
Holdings current value
$1.58B
Avg closing price
$41.90
Last action
Trimmed 3.5%
2025Q4
Current —
5
FDSFACTSET RESH SYS INC
Financial Services·Financial Data & Stock Exchanges
3.53%
of portfolio
Number of shares
2,777,627 sh
Holdings current value
$1.33B
Avg closing price
$212.07
+9.7%
Last action
Added 62.6%
2025Q4
Current $232.73
6
MSCIMSCI INC
Financial Services·Financial Data & Stock Exchanges
3.43%
of portfolio
Number of shares
2,279,500 sh
Holdings current value
$1.29B
Avg closing price
$231.43
+145.7%
Last action
Added 18.9%
2025Q4
Current $568.55
7
IDXXIDEXX LABS INC
Healthcare·Diagnostics & Research
3.40%
of portfolio
Number of shares
2,300,017 sh
Holdings current value
$1.28B
Avg closing price
$104.10
+466.1%
Last action
Trimmed 3.6%
2025Q4
Current $589.25
8
MTNVAIL RESORTS INC
Consumer Cyclical·Resorts & Casinos
2.80%
of portfolio
Number of shares
4,920,015 sh
Holdings current value
$1.05B
Avg closing price
$152.03
-12.4%
Last action
Trimmed 15.4%
2025Q4
Current $133.22
9
AKXANSYS INC
1.92%
of portfolio
Number of shares
1,987,400 sh
Holdings current value
$721.19M
Avg closing price
$102.95
Last action
Exited
2025Q3
Current —
10
HHYATT HOTELS CORP
Consumer Cyclical·Lodging
1.88%
of portfolio
Number of shares
5,405,089 sh
Holdings current value
$704.88M
Avg closing price
$67.76
+154.5%
Last action
Trimmed 0.2%
2025Q4
Current $172.48
11
GWREGUIDEWIRE SOFTWARE INC
Technology·Software - Application
1.85%
of portfolio
Number of shares
6,361,042 sh
Holdings current value
$693.61M
Avg closing price
$65.03
+115.8%
Last action
Trimmed 0.3%
2025Q4
Current $140.36
12
KNSLKINSALE CAP GROUP INC
Financial Services·Insurance - Property & Casualty
1.72%
of portfolio
Number of shares
1,925,514 sh
Holdings current value
$644.87M
Avg closing price
$84.46
+327.2%
Last action
Trimmed 0.4%
2025Q4
Current $360.78
13
IRDMIRIDIUM COMMUNICATIONS INC
Communication Services·Telecom Services
1.54%
of portfolio
Number of shares
14,045,775 sh
Holdings current value
$578.12M
Avg closing price
$18.33
+128.3%
Last action
Trimmed 3.3%
2025Q4
Current $41.85
14
SCHWSCHWAB CHARLES CORP
Financial Services·Capital Markets
1.49%
of portfolio
Number of shares
8,127,538 sh
Holdings current value
$559.17M
Avg closing price
$35.45
+160.3%
Last action
Trimmed 0.9%
2025Q4
Current $92.28
15
RRRRED ROCK RESORTS INC
Consumer Cyclical·Resorts & Casinos
1.47%
of portfolio
Number of shares
10,358,854 sh
Holdings current value
$552.44M
Avg closing price
$33.63
+69.2%
Last action
Added 2.5%
2025Q4
Current $56.91
16
CHHCHOICE HOTELS INTL INC
Consumer Cyclical·Lodging
1.45%
of portfolio
Number of shares
4,810,297 sh
Holdings current value
$545.01M
Avg closing price
$73.55
+62.1%
Last action
Added 72.8%
2025Q4
Current $119.19
17
GLPIGAMING & LEISURE PPTYS INCREIT
Real Estate·REIT - Specialty
1.10%
of portfolio
Number of shares
8,374,698 sh
Holdings current value
$413.29M
Avg closing price
$32.44
+47.1%
Last action
Trimmed 28.2%
2025Q4
Current $47.73
18
TECHBIO-TECHNE CORP
Healthcare·Biotechnology
1.10%
of portfolio
Number of shares
5,352,006 sh
Holdings current value
$412.96M
Avg closing price
$87.15
-32.0%
Last action
Trimmed 19.4%
2025Q4
Current $59.23
19
MTDMETTLER TOLEDO INTERNATIONAL
Healthcare·Diagnostics & Research
1.06%
of portfolio
Number of shares
326,722 sh
Holdings current value
$396.30M
Avg closing price
$345.85
+287.6%
Last action
Trimmed 16.6%
2025Q4
Current $1341
20
PRIPRIMERICA INC
Financial Services·Insurance - Life
1.05%
of portfolio
Number of shares
1,908,848 sh
Holdings current value
$392.76M
Avg closing price
$44.69
+510.7%
Last action
Trimmed 12.6%
2025Q4
Current $272.89
21
MORNMORNINGSTAR INC
Financial Services·Financial Data & Stock Exchanges
1.01%
of portfolio
Number of shares
1,322,451 sh
Holdings current value
$378.54M
Avg closing price
$117.66
+56.6%
Last action
Trimmed 11.5%
2025Q4
Current $184.28
22
WSTWEST PHARMACEUTICAL SVSC INC
Healthcare·Medical Instruments & Supplies
0.94%
of portfolio
Number of shares
997,821 sh
Holdings current value
$351.35M
Avg closing price
$69.77
+292.3%
Last action
Trimmed 3.6%
2025Q4
Current $273.73
23
VRSKVERISK ANALYTICS INC
Industrials·Consulting Services
0.88%
of portfolio
Number of shares
1,380,219 sh
Holdings current value
$329.68M
Avg closing price
$110.27
+61.5%
Last action
Added 6.3%
2025Q4
Current $178.07
24
VRTVERTIV HOLDINGS CO
Industrials·Electrical Equipment & Parts
0.86%
of portfolio
Number of shares
6,750,000 sh
Holdings current value
$324.20M
Avg closing price
$13.22
+2225.3%
Last action
Trimmed 7.2%
2025Q4
Current $307.34
25
G4705A100ICON PLC
0.74%
of portfolio
Number of shares
987,761 sh
Holdings current value
$279.61M
Avg closing price
$141.00
Last action
Trimmed 13.2%
2025Q4
Current —
26
NVDANVIDIA CORPORATION
Technology·Semiconductors
0.73%
of portfolio
Number of shares
556,881 sh
Holdings current value
$275.78M
Avg closing price
$142.81
+41.2%
Last action
Added 0.7%
2025Q4
Current $201.68
27
FNDFLOOR & DECOR HLDGS INC
Consumer Cyclical·Home Improvement Retail
0.67%
of portfolio
Number of shares
2,257,893 sh
Holdings current value
$251.89M
Avg closing price
$60.90
-11.2%
Last action
Trimmed 7.1%
2025Q4
Current $54.07
28
SITESITEONE LANDSCAPE SUPPLY INC
Industrials·Industrial Distribution
0.65%
of portfolio
Number of shares
1,495,341 sh
Holdings current value
$242.99M
Avg closing price
$94.03
+53.5%
Last action
Added 4.3%
2025Q4
Current $144.35
29
DAYCERIDIAN HCM HLDG INC
0.64%
of portfolio
Number of shares
3,565,708 sh
Holdings current value
$239.33M
Avg closing price
$45.74
+52.7%
Last action
Exited
2025Q4
Current $69.86
30
TSMTAIWAN SEMICONDUCTOR MFG LTDADR
Technology·Semiconductors
0.60%
of portfolio
Number of shares
2,163,055 sh
Holdings current value
$224.96M
Avg closing price
$96.33
+284.6%
Last action
Added 1.3%
2025Q4
Current $370.50
31
ASGNASGN INC
Technology·Information Technology Services
0.57%
of portfolio
Number of shares
2,227,200 sh
Holdings current value
$214.19M
Avg closing price
$80.58
-51.1%
Last action
Trimmed 0.5%
2025Q4
Current $39.44
32
TREXTREX CO INC
Industrials·Building Products & Equipment
0.55%
of portfolio
Number of shares
2,505,372 sh
Holdings current value
$207.42M
Avg closing price
$65.01
-34.2%
Last action
Exited
2025Q4
Current $42.77
33
MSFTMICROSOFT CORP
Technology·Software - Infrastructure
0.54%
of portfolio
Number of shares
540,002 sh
Holdings current value
$203.06M
Avg closing price
$231.09
+83.0%
Last action
Added 1.2%
2025Q4
Current $422.79
34
EQIXEQUINIX INCREIT
Real Estate·REIT - Specialty
0.51%
of portfolio
Number of shares
236,271 sh
Holdings current value
$190.29M
Avg closing price
$693.09
+57.1%
Last action
Trimmed 12.2%
2025Q4
Current $1089
35
TOLTOLL BROTHERS INC
Consumer Cyclical·Residential Construction
0.49%
of portfolio
Number of shares
1,801,690 sh
Holdings current value
$185.20M
Avg closing price
$89.29
+64.3%
Last action
Added 0.5%
2025Q4
Current $146.68
36
DAVAENDAVA PLCADR
Technology·Software - Infrastructure
0.49%
of portfolio
Number of shares
2,356,089 sh
Holdings current value
$183.42M
Avg closing price
$47.74
-89.9%
Last action
Exited
2025Q4
Current $4.84
37
FICOFAIR ISAAC CORP
Technology·Software - Application
0.47%
of portfolio
Number of shares
151,004 sh
Holdings current value
$175.77M
Avg closing price
$384.07
+179.5%
Last action
Trimmed 4.5%
2025Q4
Current $1074
38
FIGSFIGS INC
Consumer Cyclical·Apparel Manufacturing
0.47%
of portfolio
Number of shares
25,215,484 sh
Holdings current value
$175.25M
Avg closing price
$7.14
+126.4%
Last action
Added 0.1%
2025Q4
Current $16.17
39
SHOPSHOPIFY INC
Technology·Software - Application
0.46%
of portfolio
Number of shares
2,214,958 sh
Holdings current value
$172.55M
Avg closing price
$100.58
+30.4%
Last action
Added 0.1%
2025Q4
Current $131.15
40
IBPINSTALLED BLDG PRODS INC
Consumer Cyclical·Residential Construction
0.45%
of portfolio
Number of shares
915,905 sh
Holdings current value
$167.45M
Avg closing price
$83.49
+256.5%
Last action
Trimmed 3.7%
2025Q4
Current $297.64
41
CNSCOHEN & STEERS INC
Financial Services·Asset Management
0.44%
of portfolio
Number of shares
2,178,035 sh
Holdings current value
$164.94M
Avg closing price
$49.54
+34.6%
Last action
Trimmed 41.8%
2025Q4
Current $66.67
42
BFAMBRIGHT HORIZONS FAM SOL IN D
Consumer Cyclical·Personal Services
0.43%
of portfolio
Number of shares
1,713,999 sh
Holdings current value
$161.53M
Avg closing price
$74.96
+13.1%
Last action
Added 4.5%
2025Q4
Current $84.76
43
AREALEXANDRIA REAL ESTATE EQ INREIT
Real Estate·REIT - Office
0.42%
of portfolio
Number of shares
1,232,649 sh
Holdings current value
$156.26M
Avg closing price
$108.58
-55.2%
Last action
Exited
2025Q4
Current $48.63
44
GTLSCHART INDS INC
Industrials·Specialty Industrial Machinery
0.42%
of portfolio
Number of shares
1,145,013 sh
Holdings current value
$156.10M
Avg closing price
$139.72
+49.1%
Last action
Exited
2025Q3
Current $208.30
45
HLIHOULIHAN LOKEY INC
Financial Services·Capital Markets
0.41%
of portfolio
Number of shares
1,298,610 sh
Holdings current value
$155.72M
Avg closing price
$46.69
+248.1%
Last action
Trimmed 0.5%
2025Q4
Current $162.50
46
AMZNAMAZON COM INC
Consumer Cyclical·Internet Retail
0.41%
of portfolio
Number of shares
1,024,453 sh
Holdings current value
$155.66M
Avg closing price
$201.71
+24.2%
Last action
Added 16.7%
2025Q4
Current $250.56
47
ROPROPER TECHNOLOGIES INC
Technology·Software - Application
0.41%
of portfolio
Number of shares
283,609 sh
Holdings current value
$154.62M
Avg closing price
$214.42
+69.0%
Last action
Trimmed 6.2%
2025Q4
Current $362.44
48
DNUTKRISPY KREME INC
Consumer Defensive·Grocery Stores
0.38%
of portfolio
Number of shares
9,487,867 sh
Holdings current value
$143.17M
Avg closing price
$12.64
-71.4%
Last action
Exited
2025Q2
Current $3.61
49
M2029K104BIRKENSTOCK HOLDING PLC
0.38%
of portfolio
Number of shares
2,934,001 sh
Holdings current value
$142.97M
Avg closing price
$46.40
Last action
Added 122.0%
2025Q4
Current —
50
TTDTHE TRADE DESK INC
Communication Services·Advertising Agencies
0.37%
of portfolio
Number of shares
1,928,933 sh
Holdings current value
$138.81M
Avg closing price
$69.39
-67.6%
Last action
Trimmed 40.2%
2025Q4
Current $22.47
51
PENNPENN NATL GAMING INC
Consumer Cyclical·Resorts & Casinos
0.36%
of portfolio
Number of shares
5,142,744 sh
Holdings current value
$133.81M
Avg closing price
$20.07
-21.0%
Last action
Exited
2024Q2
Current $15.85
52
ALTREURALTAIR ENGR INC
0.36%
of portfolio
Number of shares
1,585,507 sh
Holdings current value
$133.42M
Avg closing price
$24.14
Last action
Exited
2025Q1
Current —
53
NEOGNEOGEN CORP
Healthcare·Medical Devices
0.35%
of portfolio
Number of shares
6,624,299 sh
Holdings current value
$133.21M
Avg closing price
$23.50
-59.5%
Last action
Trimmed 16.9%
2025Q4
Current $9.51
54
BABAALIBABA GROUP HLDG LTDADR
Consumer Cyclical·Internet Retail
0.34%
of portfolio
Number of shares
1,649,689 sh
Holdings current value
$127.87M
Avg closing price
$137.00
+2.9%
Last action
Added 4.3%
2025Q4
Current $141.01
55
SPOTSPOTIFY TECHNOLOGY S A
Communication Services·Internet Content & Information
0.34%
of portfolio
Number of shares
673,653 sh
Holdings current value
$126.59M
Avg closing price
$264.41
+102.9%
Last action
Added 1.3%
2025Q4
Current $536.61
56
TDGTRANSDIGM GROUP INC
Industrials·Aerospace & Defense
0.34%
of portfolio
Number of shares
125,000 sh
Holdings current value
$126.45M
Avg closing price
$310.31
+307.9%
Last action
Trimmed 3.4%
2025Q4
Current $1266
57
PLDPROLOGIS INC.REIT
Real Estate·REIT - Industrial
0.33%
of portfolio
Number of shares
940,358 sh
Holdings current value
$125.35M
Avg closing price
$113.96
+27.3%
Last action
Added 30.1%
2025Q4
Current $145.10
58
DXCMDEXCOM INC
Healthcare·Medical Devices
0.33%
of portfolio
Number of shares
997,708 sh
Holdings current value
$123.81M
Avg closing price
$82.47
-22.4%
Last action
Trimmed 1.5%
2025Q4
Current $63.98
59
VACMARRIOTT VACATIONS WORLDWIDE
Consumer Cyclical·Resorts & Casinos
0.33%
of portfolio
Number of shares
1,447,205 sh
Holdings current value
$122.85M
Avg closing price
$95.52
-21.5%
Last action
Trimmed 0.1%
2025Q3
Current $74.98
60
AZPN1USDASPEN TECHNOLOGY INC
0.32%
of portfolio
Number of shares
554,098 sh
Holdings current value
$121.98M
Avg closing price
$237.46
Last action
Exited
2025Q1
Current —
61
VRSNVERISIGN INC
Technology·Software - Infrastructure
0.31%
of portfolio
Number of shares
574,274 sh
Holdings current value
$118.28M
Avg closing price
$100.79
+171.9%
Last action
Trimmed 9.5%
2025Q4
Current $274.05
62
CPNGCOUPANG INC
Consumer Cyclical·Internet Retail
0.31%
of portfolio
Number of shares
7,248,164 sh
Holdings current value
$117.35M
Avg closing price
$17.00
+26.7%
Last action
Trimmed 0.4%
2025Q4
Current $21.55
63
BYDBOYD GAMING CORP
Consumer Cyclical·Resorts & Casinos
0.30%
of portfolio
Number of shares
1,825,853 sh
Holdings current value
$114.32M
Avg closing price
$49.25
+77.7%
Last action
Trimmed 0.1%
2025Q1
Current $87.52
64
AXNX*AXONICS INC
0.30%
of portfolio
Number of shares
1,797,963 sh
Holdings current value
$111.89M
Avg closing price
$42.18
Last action
Exited
2024Q2
Current —
65
ARGXARGENX SEADR
Healthcare·Biotechnology
0.29%
of portfolio
Number of shares
287,379 sh
Holdings current value
$109.33M
Avg closing price
$243.37
+248.9%
Last action
Trimmed 4.6%
2025Q4
Current $849.04
66
RBCRBC BEARINGS INC
Industrials·Tools & Accessories
0.29%
of portfolio
Number of shares
376,442 sh
Holdings current value
$107.24M
Avg closing price
$164.00
+259.6%
Last action
Trimmed 6.1%
2025Q4
Current $589.77
67
MELIMERCADOLIBRE INC
Consumer Cyclical·Internet Retail
0.28%
of portfolio
Number of shares
67,768 sh
Holdings current value
$106.50M
Avg closing price
$1029
+80.4%
Last action
Trimmed 1.0%
2025Q4
Current $1856
68
CBRECBRE GROUP INC
Real Estate·Real Estate Services
0.28%
of portfolio
Number of shares
1,139,151 sh
Holdings current value
$106.04M
Avg closing price
$71.78
+111.1%
Last action
Trimmed 0.3%
2025Q4
Current $151.51
69
APHAMPHENOL CORP NEW
Technology·Electronic Components
0.27%
of portfolio
Number of shares
1,006,198 sh
Holdings current value
$99.74M
Avg closing price
$75.33
+100.5%
Last action
Trimmed 15.1%
2025Q4
Current $151.06
70
CDWCDW CORP
Technology·Information Technology Services
0.26%
of portfolio
Number of shares
429,426 sh
Holdings current value
$97.62M
Avg closing price
$70.60
+89.7%
Last action
Trimmed 6.7%
2025Q4
Current $133.96
71
DHID R HORTON INC
Consumer Cyclical·Residential Construction
0.26%
of portfolio
Number of shares
635,880 sh
Holdings current value
$96.64M
Avg closing price
$89.90
+66.6%
Last action
Exited
2025Q4
Current $149.81
72
VEEVVEEVA SYS INC
Healthcare·Health Information Services
0.26%
of portfolio
Number of shares
500,411 sh
Holdings current value
$96.34M
Avg closing price
$98.81
+70.0%
Last action
Trimmed 11.3%
2025Q4
Current $167.95
73
BXBLACKSTONE INC
Financial Services·Asset Management
0.26%
of portfolio
Number of shares
733,234 sh
Holdings current value
$95.99M
Avg closing price
$119.44
+8.1%
Last action
Trimmed 4.7%
2025Q4
Current $129.08
74
H5919C104ON HLDG AG
0.25%
of portfolio
Number of shares
3,524,993 sh
Holdings current value
$95.07M
Avg closing price
$35.38
Last action
Added 23.0%
2025Q4
Current —
75
216648402COOPER COS INC
0.25%
of portfolio
Number of shares
251,098 sh
Holdings current value
$95.03M
Avg closing price
$213.74
Last action
Exited
2024Q1
Current —

Portfolio heatmap

Box size = % of portfolio · color = return since filing
TSLA
11.72% · +61.2%
IT
5.32% · -65.7%
CSGP
4.51% · -54.5%
ARCH CAP GROUP LTD
4.21%
FDS
3.53% · -51.2%
MSCI
3.43% · +0.5%
IDXX
3.40% · +6.2%
MTN
2.80% · -37.6%
AKX
1.92%
H
1.88% · +32.3%
GWRE
1.85% · +28.7%
KNSL
1.72% · +7.7%
IRDM
1.54% · +1.7%
SCHW
1.49% · +34.1%
RRR
1.47% · +6.7%
CHH
1.45% · +5.2%
GLPI
1.10% · -3.3%
TECH
1.10% · -23.2%
MTD
1.06% · +10.5%
PRI
1.05% · +32.6%
MORN
1.01% · -35.6%
WST
0.94% · -22.3%
VRSK
0.88% · -25.5%
VRT
0.86% · +539.9%

Sector exposure

Share of dollar value across the latest reported portfolio. Unclassified positions excluded.
  • Consumer Cyclical43 pos$10.28B30.9%
  • Technology65 pos$6.25B18.8%
  • Financial Services35 pos$5.73B17.3%
  • Healthcare52 pos$3.57B10.8%
  • Real Estate29 pos$3.37B10.1%
  • Industrials30 pos$2.37B7.2%
  • Communication Services14 pos$1.27B3.8%
  • Consumer Defensive6 pos$239.9M0.7%
  • Basic Materials5 pos$123.5M0.4%
  • Energy1 pos$29K0.0%
(11.6% unclassified, excluded from %)