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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/
  2. Super Investors/
  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 · 2024Q1
1 / 5
75 of 332
1
TSLATESLA INC
Consumer Cyclical·Auto Manufacturers
8.07%
of portfolio
Number of shares
17,217,795 sh
Holdings current value
$3.03B
Avg closing price
$304.15
+31.7%
Last action
Trimmed 0.1%
2025Q4
Current $400.62
2
ITGARTNER INC
Technology·Information Technology Services
5.40%
of portfolio
Number of shares
4,250,733 sh
Holdings current value
$2.03B
Avg closing price
$116.73
+32.5%
Last action
Trimmed 2.5%
2025Q4
Current $154.62
3
G0450A105ARCH CAP GROUP LTD
5.18%
of portfolio
Number of shares
21,024,711 sh
Holdings current value
$1.94B
Avg closing price
$41.90
Last action
Trimmed 3.5%
2025Q4
Current —
4
CSGPCOSTAR GROUP INC
Real Estate·Real Estate Services
4.98%
of portfolio
Number of shares
19,337,618 sh
Holdings current value
$1.87B
Avg closing price
$91.42
-56.6%
Last action
Added 1.3%
2025Q4
Current $39.72
5
MSCIMSCI INC
Financial Services·Financial Data & Stock Exchanges
3.37%
of portfolio
Number of shares
2,254,035 sh
Holdings current value
$1.26B
Avg closing price
$231.43
+145.7%
Last action
Added 19.1%
2025Q4
Current $568.55
6
FDSFACTSET RESH SYS INC
Financial Services·Financial Data & Stock Exchanges
3.31%
of portfolio
Number of shares
2,737,284 sh
Holdings current value
$1.24B
Avg closing price
$212.07
+9.7%
Last action
Added 64.2%
2025Q4
Current $232.73
7
IDXXIDEXX LABS INC
Healthcare·Diagnostics & Research
3.03%
of portfolio
Number of shares
2,104,951 sh
Holdings current value
$1.14B
Avg closing price
$104.10
+466.1%
Last action
Trimmed 3.9%
2025Q4
Current $589.25
8
MTNVAIL RESORTS INC
Consumer Cyclical·Resorts & Casinos
2.85%
of portfolio
Number of shares
4,795,287 sh
Holdings current value
$1.07B
Avg closing price
$152.03
-12.4%
Last action
Trimmed 15.7%
2025Q4
Current $133.22
9
KNSLKINSALE CAP GROUP INC
Financial Services·Insurance - Property & Casualty
2.69%
of portfolio
Number of shares
1,920,920 sh
Holdings current value
$1.01B
Avg closing price
$84.46
+327.2%
Last action
Trimmed 0.4%
2025Q4
Current $360.78
10
HHYATT HOTELS CORP
Consumer Cyclical·Lodging
2.29%
of portfolio
Number of shares
5,377,052 sh
Holdings current value
$858.29M
Avg closing price
$67.76
+154.5%
Last action
Trimmed 0.2%
2025Q4
Current $172.48
11
GWREGUIDEWIRE SOFTWARE INC
Technology·Software - Application
1.93%
of portfolio
Number of shares
6,215,742 sh
Holdings current value
$725.44M
Avg closing price
$65.03
+115.8%
Last action
Trimmed 0.3%
2025Q4
Current $140.36
12
RRRRED ROCK RESORTS INC
Consumer Cyclical·Resorts & Casinos
1.66%
of portfolio
Number of shares
10,409,100 sh
Holdings current value
$622.67M
Avg closing price
$33.63
+69.2%
Last action
Added 2.5%
2025Q4
Current $56.91
13
AKXANSYS INC
1.63%
of portfolio
Number of shares
1,756,370 sh
Holdings current value
$609.74M
Avg closing price
$102.95
Last action
Exited
2025Q3
Current —
14
CHHCHOICE HOTELS INTL INC
Consumer Cyclical·Lodging
1.60%
of portfolio
Number of shares
4,754,307 sh
Holdings current value
$600.71M
Avg closing price
$73.55
+62.1%
Last action
Added 74.3%
2025Q4
Current $119.19
15
SCHWSCHWAB CHARLES CORP
Financial Services·Capital Markets
1.43%
of portfolio
Number of shares
7,432,213 sh
Holdings current value
$537.65M
Avg closing price
$35.45
+160.3%
Last action
Trimmed 1.0%
2025Q4
Current $92.28
16
PRIPRIMERICA INC
Financial Services·Insurance - Life
1.28%
of portfolio
Number of shares
1,904,478 sh
Holdings current value
$481.76M
Avg closing price
$44.69
+510.7%
Last action
Trimmed 12.6%
2025Q4
Current $272.89
17
MTDMETTLER TOLEDO INTERNATIONAL
Healthcare·Diagnostics & Research
1.08%
of portfolio
Number of shares
304,583 sh
Holdings current value
$405.49M
Avg closing price
$345.85
+287.6%
Last action
Trimmed 17.6%
2025Q4
Current $1341
18
MORNMORNINGSTAR INC
Financial Services·Financial Data & Stock Exchanges
1.08%
of portfolio
Number of shares
1,308,671 sh
Holdings current value
$403.55M
Avg closing price
$117.66
+56.6%
Last action
Trimmed 11.6%
2025Q4
Current $184.28
19
NVDANVIDIA CORPORATION
Technology·Semiconductors
1.07%
of portfolio
Number of shares
446,166 sh
Holdings current value
$403.14M
Avg closing price
$142.81
+41.2%
Last action
Added 0.8%
2025Q4
Current $201.68
20
VRTVERTIV HOLDINGS CO
Industrials·Electrical Equipment & Parts
1.06%
of portfolio
Number of shares
4,850,000 sh
Holdings current value
$396.10M
Avg closing price
$13.22
+2225.3%
Last action
Trimmed 9.8%
2025Q4
Current $307.34
21
GLPIGAMING & LEISURE PPTYS INCREIT
Real Estate·REIT - Specialty
1.01%
of portfolio
Number of shares
8,264,702 sh
Holdings current value
$380.75M
Avg closing price
$32.44
+47.1%
Last action
Trimmed 28.4%
2025Q4
Current $47.73
22
WSTWEST PHARMACEUTICAL SVSC INC
Healthcare·Medical Instruments & Supplies
0.94%
of portfolio
Number of shares
891,945 sh
Holdings current value
$352.95M
Avg closing price
$69.77
+292.3%
Last action
Trimmed 4.1%
2025Q4
Current $273.73
23
TECHBIO-TECHNE CORP
Healthcare·Biotechnology
0.94%
of portfolio
Number of shares
4,998,210 sh
Holdings current value
$351.82M
Avg closing price
$87.15
-32.0%
Last action
Trimmed 20.5%
2025Q4
Current $59.23
24
G4705A100ICON PLC
0.87%
of portfolio
Number of shares
969,991 sh
Holdings current value
$325.87M
Avg closing price
$141.00
Last action
Trimmed 13.4%
2025Q4
Current —
25
IRDMIRIDIUM COMMUNICATIONS INC
Communication Services·Telecom Services
0.83%
of portfolio
Number of shares
11,925,775 sh
Holdings current value
$311.98M
Avg closing price
$18.33
+128.3%
Last action
Trimmed 3.9%
2025Q4
Current $41.85
26
VRSKVERISK ANALYTICS INC
Industrials·Consulting Services
0.82%
of portfolio
Number of shares
1,305,629 sh
Holdings current value
$307.78M
Avg closing price
$110.27
+61.5%
Last action
Added 6.7%
2025Q4
Current $178.07
27
SITESITEONE LANDSCAPE SUPPLY INC
Industrials·Industrial Distribution
0.70%
of portfolio
Number of shares
1,495,837 sh
Holdings current value
$261.10M
Avg closing price
$94.03
+53.5%
Last action
Added 4.3%
2025Q4
Current $144.35
28
MSFTMICROSOFT CORP
Technology·Software - Infrastructure
0.66%
of portfolio
Number of shares
586,917 sh
Holdings current value
$246.93M
Avg closing price
$231.09
+83.0%
Last action
Added 1.1%
2025Q4
Current $422.79
29
FNDFLOOR & DECOR HLDGS INC
Consumer Cyclical·Home Improvement Retail
0.63%
of portfolio
Number of shares
1,832,533 sh
Holdings current value
$237.53M
Avg closing price
$60.90
-11.2%
Last action
Trimmed 8.6%
2025Q4
Current $54.07
30
ASGNASGN INC
Technology·Information Technology Services
0.62%
of portfolio
Number of shares
2,227,200 sh
Holdings current value
$233.32M
Avg closing price
$80.58
-51.1%
Last action
Trimmed 0.5%
2025Q4
Current $39.44
31
TOLTOLL BROTHERS INC
Consumer Cyclical·Residential Construction
0.62%
of portfolio
Number of shares
1,793,790 sh
Holdings current value
$232.06M
Avg closing price
$89.29
+64.3%
Last action
Added 0.5%
2025Q4
Current $146.68
32
TREXTREX CO INC
Industrials·Building Products & Equipment
0.61%
of portfolio
Number of shares
2,297,372 sh
Holdings current value
$229.16M
Avg closing price
$65.01
-34.2%
Last action
Exited
2025Q4
Current $42.77
33
SPOTSPOTIFY TECHNOLOGY S A
Communication Services·Internet Content & Information
0.61%
of portfolio
Number of shares
864,584 sh
Holdings current value
$228.16M
Avg closing price
$264.41
+102.9%
Last action
Added 1.0%
2025Q4
Current $536.61
34
DAYCERIDIAN HCM HLDG INC
0.61%
of portfolio
Number of shares
3,439,154 sh
Holdings current value
$227.71M
Avg closing price
$45.74
+52.7%
Last action
Exited
2025Q4
Current $69.86
35
IBPINSTALLED BLDG PRODS INC
Consumer Cyclical·Residential Construction
0.55%
of portfolio
Number of shares
795,178 sh
Holdings current value
$205.74M
Avg closing price
$83.49
+256.5%
Last action
Trimmed 4.2%
2025Q4
Current $297.64
36
GTLSCHART INDS INC
Industrials·Specialty Industrial Machinery
0.51%
of portfolio
Number of shares
1,170,013 sh
Holdings current value
$192.72M
Avg closing price
$139.72
+49.1%
Last action
Exited
2025Q3
Current $208.30
37
AMZNAMAZON COM INC
Consumer Cyclical·Internet Retail
0.51%
of portfolio
Number of shares
1,065,160 sh
Holdings current value
$192.13M
Avg closing price
$201.71
+24.2%
Last action
Added 16.0%
2025Q4
Current $250.56
38
BFAMBRIGHT HORIZONS FAM SOL IN D
Consumer Cyclical·Personal Services
0.50%
of portfolio
Number of shares
1,662,978 sh
Holdings current value
$188.52M
Avg closing price
$74.96
+13.1%
Last action
Added 4.7%
2025Q4
Current $84.76
39
FICOFAIR ISAAC CORP
Technology·Software - Application
0.46%
of portfolio
Number of shares
136,818 sh
Holdings current value
$170.97M
Avg closing price
$384.07
+179.5%
Last action
Trimmed 5.0%
2025Q4
Current $1074
40
SHOPSHOPIFY INC
Technology·Software - Application
0.45%
of portfolio
Number of shares
2,204,973 sh
Holdings current value
$170.16M
Avg closing price
$100.58
+30.4%
Last action
Added 0.1%
2025Q4
Current $131.15
41
HLIHOULIHAN LOKEY INC
Financial Services·Capital Markets
0.44%
of portfolio
Number of shares
1,298,140 sh
Holdings current value
$166.41M
Avg closing price
$46.69
+248.1%
Last action
Trimmed 0.5%
2025Q4
Current $162.50
42
TTDTHE TRADE DESK INC
Communication Services·Advertising Agencies
0.44%
of portfolio
Number of shares
1,901,685 sh
Holdings current value
$166.25M
Avg closing price
$69.39
-67.6%
Last action
Trimmed 40.6%
2025Q4
Current $22.47
43
CNSCOHEN & STEERS INC
Financial Services·Asset Management
0.44%
of portfolio
Number of shares
2,143,035 sh
Holdings current value
$164.78M
Avg closing price
$49.54
+34.6%
Last action
Trimmed 42.2%
2025Q4
Current $66.67
44
EQIXEQUINIX INCREIT
Real Estate·REIT - Specialty
0.44%
of portfolio
Number of shares
198,503 sh
Holdings current value
$163.83M
Avg closing price
$693.09
+57.1%
Last action
Trimmed 14.2%
2025Q4
Current $1089
45
AREALEXANDRIA REAL ESTATE EQ INREIT
Real Estate·REIT - Office
0.41%
of portfolio
Number of shares
1,203,016 sh
Holdings current value
$155.08M
Avg closing price
$108.58
-55.2%
Last action
Exited
2025Q4
Current $48.63
46
ROPROPER TECHNOLOGIES INC
Technology·Software - Application
0.40%
of portfolio
Number of shares
264,763 sh
Holdings current value
$148.49M
Avg closing price
$214.42
+69.0%
Last action
Trimmed 6.6%
2025Q4
Current $362.44
47
DNUTKRISPY KREME INC
Consumer Defensive·Grocery Stores
0.40%
of portfolio
Number of shares
9,734,467 sh
Holdings current value
$148.30M
Avg closing price
$12.64
-71.4%
Last action
Exited
2025Q2
Current $3.61
48
TSMTAIWAN SEMICONDUCTOR MFG LTDADR
Technology·Semiconductors
0.39%
of portfolio
Number of shares
1,066,264 sh
Holdings current value
$145.07M
Avg closing price
$96.33
+284.6%
Last action
Added 2.8%
2025Q4
Current $370.50
49
CPNGCOUPANG INC
Consumer Cyclical·Internet Retail
0.38%
of portfolio
Number of shares
7,942,062 sh
Holdings current value
$141.29M
Avg closing price
$17.00
+26.7%
Last action
Trimmed 0.4%
2025Q4
Current $21.55
50
M2029K104BIRKENSTOCK HOLDING PLC
0.37%
of portfolio
Number of shares
2,974,458 sh
Holdings current value
$140.54M
Avg closing price
$46.40
Last action
Added 118.4%
2025Q4
Current —
51
METAMETA PLATFORMS INC
Communication Services·Internet Content & Information
0.37%
of portfolio
Number of shares
282,937 sh
Holdings current value
$137.39M
Avg closing price
$244.55
+181.6%
Last action
Added 1.8%
2025Q4
Current $688.55
52
DXCMDEXCOM INC
Healthcare·Medical Devices
0.36%
of portfolio
Number of shares
967,983 sh
Holdings current value
$134.26M
Avg closing price
$82.47
-22.4%
Last action
Trimmed 1.5%
2025Q4
Current $63.98
53
FIGSFIGS INC
Consumer Cyclical·Apparel Manufacturing
0.34%
of portfolio
Number of shares
25,731,980 sh
Holdings current value
$128.15M
Avg closing price
$7.14
+126.4%
Last action
Added 0.1%
2025Q4
Current $16.17
54
BYDBOYD GAMING CORP
Consumer Cyclical·Resorts & Casinos
0.34%
of portfolio
Number of shares
1,899,344 sh
Holdings current value
$127.86M
Avg closing price
$49.25
+77.7%
Last action
Trimmed 0.1%
2025Q1
Current $87.52
55
TDGTRANSDIGM GROUP INC
Industrials·Aerospace & Defense
0.33%
of portfolio
Number of shares
100,000 sh
Holdings current value
$123.16M
Avg closing price
$310.31
+307.9%
Last action
Trimmed 4.2%
2025Q4
Current $1266
56
H5919C104ON HLDG AG
0.32%
of portfolio
Number of shares
3,394,195 sh
Holdings current value
$120.09M
Avg closing price
$35.38
Last action
Added 24.1%
2025Q4
Current —
57
ALTREURALTAIR ENGR INC
0.32%
of portfolio
Number of shares
1,385,507 sh
Holdings current value
$119.36M
Avg closing price
$24.14
Last action
Exited
2025Q1
Current —
58
PLDPROLOGIS INC.REIT
Real Estate·REIT - Industrial
0.31%
of portfolio
Number of shares
901,660 sh
Holdings current value
$117.41M
Avg closing price
$113.96
+27.3%
Last action
Added 31.8%
2025Q4
Current $145.10
59
NEOGNEOGEN CORP
Healthcare·Medical Devices
0.31%
of portfolio
Number of shares
7,304,967 sh
Holdings current value
$115.27M
Avg closing price
$23.50
-59.5%
Last action
Trimmed 15.5%
2025Q4
Current $9.51
60
AZPN1USDASPEN TECHNOLOGY INC
0.31%
of portfolio
Number of shares
539,363 sh
Holdings current value
$115.04M
Avg closing price
$237.46
Last action
Exited
2025Q1
Current —
61
LENLENNAR CORP
Consumer Cyclical·Residential Construction
0.30%
of portfolio
Number of shares
648,867 sh
Holdings current value
$111.59M
Avg closing price
$97.47
-4.8%
Last action
Exited
2025Q2
Current $92.79
62
DKNGDRAFTKINGS INC NEW
Consumer Cyclical·Gambling
0.29%
of portfolio
Number of shares
2,392,965 sh
Holdings current value
$108.66M
Avg closing price
$28.01
-18.5%
Last action
Added 31.2%
2025Q4
Current $22.82
63
VEEVVEEVA SYS INC
Healthcare·Health Information Services
0.29%
of portfolio
Number of shares
466,154 sh
Holdings current value
$108.00M
Avg closing price
$98.81
+70.0%
Last action
Trimmed 12.0%
2025Q4
Current $167.95
64
APHAMPHENOL CORP NEW
Technology·Electronic Components
0.29%
of portfolio
Number of shares
935,817 sh
Holdings current value
$107.95M
Avg closing price
$75.33
+100.5%
Last action
Trimmed 16.0%
2025Q4
Current $151.06
65
BABAALIBABA GROUP HLDG LTDADR
Consumer Cyclical·Internet Retail
0.28%
of portfolio
Number of shares
1,477,413 sh
Holdings current value
$106.91M
Avg closing price
$137.00
+2.9%
Last action
Added 4.8%
2025Q4
Current $141.01
66
CBRECBRE GROUP INC
Real Estate·Real Estate Services
0.28%
of portfolio
Number of shares
1,085,594 sh
Holdings current value
$105.56M
Avg closing price
$71.78
+111.1%
Last action
Trimmed 0.3%
2025Q4
Current $151.51
67
ARGXARGENX SEADR
Healthcare·Biotechnology
0.28%
of portfolio
Number of shares
266,674 sh
Holdings current value
$104.99M
Avg closing price
$243.37
+248.9%
Last action
Trimmed 5.0%
2025Q4
Current $849.04
68
BXBLACKSTONE INC
Financial Services·Asset Management
0.28%
of portfolio
Number of shares
798,377 sh
Holdings current value
$104.88M
Avg closing price
$119.44
+8.1%
Last action
Trimmed 4.3%
2025Q4
Current $129.08
69
DHID R HORTON INC
Consumer Cyclical·Residential Construction
0.28%
of portfolio
Number of shares
635,880 sh
Holdings current value
$104.63M
Avg closing price
$89.90
+66.6%
Last action
Exited
2025Q4
Current $149.81
70
JBIJANUS INTERNATIONAL GROUP IN
Industrials·Building Products & Equipment
0.28%
of portfolio
Number of shares
6,871,661 sh
Holdings current value
$103.97M
Avg closing price
$10.50
-47.2%
Last action
Exited
2025Q4
Current $5.54
71
CDWCDW CORP
Technology·Information Technology Services
0.27%
of portfolio
Number of shares
398,721 sh
Holdings current value
$101.98M
Avg closing price
$70.60
+89.7%
Last action
Trimmed 7.2%
2025Q4
Current $133.96
72
INDIINDIE SEMICONDUCTOR INC
Technology·Semiconductors
0.27%
of portfolio
Number of shares
14,285,896 sh
Holdings current value
$101.14M
Avg closing price
$6.27
-46.1%
Last action
Added 1.1%
2025Q4
Current $3.38
73
MGMMGM RESORTS INTERNATIONAL
Consumer Cyclical·Resorts & Casinos
0.26%
of portfolio
Number of shares
2,101,065 sh
Holdings current value
$99.19M
Avg closing price
$43.30
-10.9%
Last action
Exited
2025Q1
Current $38.59
74
MELIMERCADOLIBRE INC
Consumer Cyclical·Internet Retail
0.26%
of portfolio
Number of shares
64,165 sh
Holdings current value
$97.01M
Avg closing price
$1029
+80.4%
Last action
Trimmed 1.0%
2025Q4
Current $1856
75
COOCOOPER COS INC
Healthcare·Medical Instruments & Supplies
0.26%
of portfolio
Number of shares
943,282 sh
Holdings current value
$95.71M
Avg closing price
$101.38
-30.9%
Last action
Added 0.1%
2025Q4
Current $70.06

Portfolio heatmap

Box size = % of portfolio · color = return since filing
TSLA
8.07% · +127.9%
IT
5.40% · -67.6%
ARCH CAP GROUP LTD
5.18%
CSGP
4.98% · -58.9%
MSCI
3.37% · +1.4%
FDS
3.31% · -48.8%
IDXX
3.03% · +9.1%
MTN
2.85% · -40.2%
KNSL
2.69% · -31.2%
H
2.29% · +8.1%
GWRE
1.93% · +20.3%
RRR
1.66% · -4.9%
AKX
1.63%
CHH
1.60% · -5.7%
SCHW
1.43% · +27.6%
PRI
1.28% · +7.9%
MTD
1.08% · +0.7%
MORN
1.08% · -40.2%
NVDA
1.07% · -77.7%
VRT
1.06% · +276.3%
GLPI
1.01% · +3.6%
WST
0.94% · -30.8%
TECH
0.94% · -15.9%
ICON PLC
0.87%

Sector exposure

Share of dollar value across the latest reported portfolio. Unclassified positions excluded.
  • Consumer Cyclical44 pos$9.14B27.7%
  • Technology66 pos$6.45B19.5%
  • Financial Services35 pos$6.22B18.8%
  • Healthcare55 pos$3.60B10.9%
  • Real Estate31 pos$3.45B10.4%
  • Industrials30 pos$2.56B7.8%
  • Communication Services16 pos$1.19B3.6%
  • Consumer Defensive6 pos$256.6M0.8%
  • Basic Materials5 pos$148.2M0.4%
  • Energy1 pos$31K0.0%
(12.0% unclassified, excluded from %)