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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 · 2023Q3
1 / 5
75 of 334
1
TSLATESLA INC
Consumer Cyclical·Auto Manufacturers
12.85%
of portfolio
Number of shares
17,668,945 sh
Holdings current value
$4.42B
Avg closing price
$304.15
+31.7%
Last action
Trimmed 0.1%
2025Q4
Current $400.62
2
G0450A105ARCH CAP GROUP LTD
4.92%
of portfolio
Number of shares
21,222,928 sh
Holdings current value
$1.69B
Avg closing price
$41.90
Last action
Trimmed 3.5%
2025Q4
Current —
3
ITGARTNER INC
Technology·Information Technology Services
4.65%
of portfolio
Number of shares
4,656,387 sh
Holdings current value
$1.60B
Avg closing price
$116.73
+32.5%
Last action
Trimmed 2.3%
2025Q4
Current $154.62
4
CSGPCOSTAR GROUP INC
Real Estate·Real Estate Services
4.29%
of portfolio
Number of shares
19,196,502 sh
Holdings current value
$1.48B
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
3.50%
of portfolio
Number of shares
2,751,596 sh
Holdings current value
$1.20B
Avg closing price
$212.07
+9.7%
Last action
Added 63.6%
2025Q4
Current $232.73
6
MSCIMSCI INC
Financial Services·Financial Data & Stock Exchanges
3.37%
of portfolio
Number of shares
2,260,105 sh
Holdings current value
$1.16B
Avg closing price
$231.43
+145.7%
Last action
Added 19.0%
2025Q4
Current $568.55
7
MTNVAIL RESORTS INC
Consumer Cyclical·Resorts & Casinos
3.04%
of portfolio
Number of shares
4,721,214 sh
Holdings current value
$1.05B
Avg closing price
$152.03
-12.4%
Last action
Trimmed 15.9%
2025Q4
Current $133.22
8
IDXXIDEXX LABS INC
Healthcare·Diagnostics & Research
2.97%
of portfolio
Number of shares
2,336,330 sh
Holdings current value
$1.02B
Avg closing price
$104.10
+466.1%
Last action
Trimmed 3.6%
2025Q4
Current $589.25
9
KNSLKINSALE CAP GROUP INC
Financial Services·Insurance - Property & Casualty
2.39%
of portfolio
Number of shares
1,985,089 sh
Holdings current value
$822.08M
Avg closing price
$84.46
+327.2%
Last action
Trimmed 0.4%
2025Q4
Current $360.78
10
IRDMIRIDIUM COMMUNICATIONS INC
Communication Services·Telecom Services
1.93%
of portfolio
Number of shares
14,583,317 sh
Holdings current value
$663.40M
Avg closing price
$18.33
+128.3%
Last action
Trimmed 3.2%
2025Q4
Current $41.85
11
AKXANSYS INC
1.73%
of portfolio
Number of shares
2,002,717 sh
Holdings current value
$595.91M
Avg closing price
$102.95
Last action
Exited
2025Q3
Current —
12
CHHCHOICE HOTELS INTL INC
Consumer Cyclical·Lodging
1.65%
of portfolio
Number of shares
4,634,126 sh
Holdings current value
$567.73M
Avg closing price
$73.55
+62.1%
Last action
Added 77.7%
2025Q4
Current $119.19
13
HHYATT HOTELS CORP
Consumer Cyclical·Lodging
1.64%
of portfolio
Number of shares
5,327,279 sh
Holdings current value
$565.12M
Avg closing price
$67.76
+154.5%
Last action
Trimmed 0.2%
2025Q4
Current $172.48
14
GWREGUIDEWIRE SOFTWARE INC
Technology·Software - Application
1.63%
of portfolio
Number of shares
6,238,882 sh
Holdings current value
$561.50M
Avg closing price
$65.03
+115.8%
Last action
Trimmed 0.3%
2025Q4
Current $140.36
15
SCHWSCHWAB CHARLES CORP
Financial Services·Capital Markets
1.29%
of portfolio
Number of shares
8,102,475 sh
Holdings current value
$444.83M
Avg closing price
$35.45
+160.3%
Last action
Trimmed 0.9%
2025Q4
Current $92.28
16
RRRRED ROCK RESORTS INC
Consumer Cyclical·Resorts & Casinos
1.17%
of portfolio
Number of shares
9,856,963 sh
Holdings current value
$404.14M
Avg closing price
$33.63
+69.2%
Last action
Added 2.6%
2025Q4
Current $56.91
17
WSTWEST PHARMACEUTICAL SVSC INC
Healthcare·Medical Instruments & Supplies
1.14%
of portfolio
Number of shares
1,050,183 sh
Holdings current value
$394.04M
Avg closing price
$69.77
+292.3%
Last action
Trimmed 3.5%
2025Q4
Current $273.73
18
GLPIGAMING & LEISURE PPTYS INCREIT
Real Estate·REIT - Specialty
1.11%
of portfolio
Number of shares
8,418,436 sh
Holdings current value
$383.46M
Avg closing price
$32.44
+47.1%
Last action
Trimmed 28.1%
2025Q4
Current $47.73
19
PRIPRIMERICA INC
Financial Services·Insurance - Life
1.09%
of portfolio
Number of shares
1,925,651 sh
Holdings current value
$373.60M
Avg closing price
$44.69
+510.7%
Last action
Trimmed 12.5%
2025Q4
Current $272.89
20
MTDMETTLER TOLEDO INTERNATIONAL
Healthcare·Diagnostics & Research
1.07%
of portfolio
Number of shares
332,895 sh
Holdings current value
$368.87M
Avg closing price
$345.85
+287.6%
Last action
Trimmed 16.3%
2025Q4
Current $1341
21
TECHBIO-TECHNE CORP
Healthcare·Biotechnology
1.06%
of portfolio
Number of shares
5,375,959 sh
Holdings current value
$365.94M
Avg closing price
$87.15
-32.0%
Last action
Trimmed 19.3%
2025Q4
Current $59.23
22
VRSKVERISK ANALYTICS INC
Industrials·Consulting Services
0.92%
of portfolio
Number of shares
1,346,080 sh
Holdings current value
$318.00M
Avg closing price
$110.27
+61.5%
Last action
Added 6.5%
2025Q4
Current $178.07
23
MORNMORNINGSTAR INC
Financial Services·Financial Data & Stock Exchanges
0.90%
of portfolio
Number of shares
1,326,608 sh
Holdings current value
$310.74M
Avg closing price
$117.66
+56.6%
Last action
Trimmed 11.5%
2025Q4
Current $184.28
24
VACMARRIOTT VACATIONS WORLDWIDE
Consumer Cyclical·Resorts & Casinos
0.80%
of portfolio
Number of shares
2,728,652 sh
Holdings current value
$274.58M
Avg closing price
$95.52
-21.5%
Last action
Trimmed 0.0%
2025Q3
Current $74.98
25
NVDANVIDIA CORPORATION
Technology·Semiconductors
0.78%
of portfolio
Number of shares
616,823 sh
Holdings current value
$268.31M
Avg closing price
$142.81
+41.2%
Last action
Added 0.6%
2025Q4
Current $201.68
26
VRTVERTIV HOLDINGS CO
Industrials·Electrical Equipment & Parts
0.77%
of portfolio
Number of shares
7,100,000 sh
Holdings current value
$264.12M
Avg closing price
$13.22
+2225.3%
Last action
Trimmed 6.9%
2025Q4
Current $307.34
27
G4705A100ICON PLC
0.71%
of portfolio
Number of shares
987,006 sh
Holdings current value
$243.05M
Avg closing price
$141.00
Last action
Trimmed 13.2%
2025Q4
Current —
28
DAYCERIDIAN HCM HLDG INC
0.70%
of portfolio
Number of shares
3,534,834 sh
Holdings current value
$239.84M
Avg closing price
$45.74
+52.7%
Last action
Exited
2025Q4
Current $69.86
29
BABAALIBABA GROUP HLDG LTDADR
Consumer Cyclical·Internet Retail
0.68%
of portfolio
Number of shares
2,705,448 sh
Holdings current value
$234.67M
Avg closing price
$137.00
+2.9%
Last action
Added 2.6%
2025Q4
Current $141.01
30
SITESITEONE LANDSCAPE SUPPLY INC
Industrials·Industrial Distribution
0.67%
of portfolio
Number of shares
1,420,607 sh
Holdings current value
$232.20M
Avg closing price
$94.03
+53.5%
Last action
Added 4.5%
2025Q4
Current $144.35
31
TSMTAIWAN SEMICONDUCTOR MFG LTDADR
Technology·Semiconductors
0.65%
of portfolio
Number of shares
2,569,980 sh
Holdings current value
$223.33M
Avg closing price
$96.33
+284.6%
Last action
Added 1.1%
2025Q4
Current $370.50
32
FNDFLOOR & DECOR HLDGS INC
Consumer Cyclical·Home Improvement Retail
0.61%
of portfolio
Number of shares
2,330,135 sh
Holdings current value
$210.88M
Avg closing price
$60.90
-11.2%
Last action
Trimmed 6.9%
2025Q4
Current $54.07
33
ASGNASGN INC
Technology·Information Technology Services
0.52%
of portfolio
Number of shares
2,210,162 sh
Holdings current value
$180.53M
Avg closing price
$80.58
-51.1%
Last action
Trimmed 0.5%
2025Q4
Current $39.44
34
GTLSCHART INDS INC
Industrials·Specialty Industrial Machinery
0.51%
of portfolio
Number of shares
1,046,057 sh
Holdings current value
$176.91M
Avg closing price
$139.72
+49.1%
Last action
Exited
2025Q3
Current $208.30
35
EQIXEQUINIX INCREIT
Real Estate·REIT - Specialty
0.50%
of portfolio
Number of shares
235,014 sh
Holdings current value
$170.68M
Avg closing price
$693.09
+57.1%
Last action
Trimmed 12.3%
2025Q4
Current $1089
36
TREXTREX CO INC
Industrials·Building Products & Equipment
0.49%
of portfolio
Number of shares
2,733,397 sh
Holdings current value
$168.46M
Avg closing price
$65.01
-34.2%
Last action
Exited
2025Q4
Current $42.77
37
BFAMBRIGHT HORIZONS FAM SOL IN D
Consumer Cyclical·Personal Services
0.48%
of portfolio
Number of shares
2,022,572 sh
Holdings current value
$164.76M
Avg closing price
$74.96
+13.1%
Last action
Added 3.8%
2025Q4
Current $84.76
38
MSFTMICROSOFT CORP
Technology·Software - Infrastructure
0.45%
of portfolio
Number of shares
489,516 sh
Holdings current value
$154.56M
Avg closing price
$231.09
+83.0%
Last action
Added 1.3%
2025Q4
Current $422.79
39
FIGSFIGS INC
Consumer Cyclical·Apparel Manufacturing
0.43%
of portfolio
Number of shares
25,032,830 sh
Holdings current value
$147.69M
Avg closing price
$7.14
+126.4%
Last action
Added 0.1%
2025Q4
Current $16.17
40
FICOFAIR ISAAC CORP
Technology·Software - Application
0.42%
of portfolio
Number of shares
167,385 sh
Holdings current value
$145.38M
Avg closing price
$384.07
+179.5%
Last action
Trimmed 4.1%
2025Q4
Current $1074
41
TTDTHE TRADE DESK INC
Communication Services·Advertising Agencies
0.42%
of portfolio
Number of shares
1,849,480 sh
Holdings current value
$144.54M
Avg closing price
$69.39
-67.6%
Last action
Trimmed 41.3%
2025Q4
Current $22.47
42
ARGXARGENX SEADR
Healthcare·Biotechnology
0.41%
of portfolio
Number of shares
287,991 sh
Holdings current value
$141.59M
Avg closing price
$243.37
+248.9%
Last action
Trimmed 4.6%
2025Q4
Current $849.04
43
CNSCOHEN & STEERS INC
Financial Services·Asset Management
0.41%
of portfolio
Number of shares
2,249,784 sh
Holdings current value
$141.04M
Avg closing price
$49.54
+34.6%
Last action
Trimmed 41.0%
2025Q4
Current $66.67
44
PENNPENN NATL GAMING INC
Consumer Cyclical·Resorts & Casinos
0.41%
of portfolio
Number of shares
6,138,520 sh
Holdings current value
$140.88M
Avg closing price
$20.07
-21.0%
Last action
Exited
2024Q2
Current $15.85
45
DAVAENDAVA PLCADR
Technology·Software - Infrastructure
0.41%
of portfolio
Number of shares
2,454,775 sh
Holdings current value
$140.78M
Avg closing price
$47.74
-89.9%
Last action
Exited
2025Q4
Current $4.84
46
HLIHOULIHAN LOKEY INC
Financial Services·Capital Markets
0.40%
of portfolio
Number of shares
1,299,577 sh
Holdings current value
$139.21M
Avg closing price
$46.69
+248.1%
Last action
Trimmed 0.5%
2025Q4
Current $162.50
47
ROPROPER TECHNOLOGIES INC
Technology·Software - Application
0.40%
of portfolio
Number of shares
283,609 sh
Holdings current value
$137.35M
Avg closing price
$214.42
+69.0%
Last action
Trimmed 6.2%
2025Q4
Current $362.44
48
TOLTOLL BROTHERS INC
Consumer Cyclical·Residential Construction
0.38%
of portfolio
Number of shares
1,784,965 sh
Holdings current value
$132.02M
Avg closing price
$89.29
+64.3%
Last action
Added 0.5%
2025Q4
Current $146.68
49
AMZNAMAZON COM INC
Consumer Cyclical·Internet Retail
0.37%
of portfolio
Number of shares
1,003,164 sh
Holdings current value
$127.52M
Avg closing price
$201.71
+24.2%
Last action
Added 17.1%
2025Q4
Current $250.56
50
IBPINSTALLED BLDG PRODS INC
Consumer Cyclical·Residential Construction
0.37%
of portfolio
Number of shares
1,010,775 sh
Holdings current value
$126.24M
Avg closing price
$83.49
+256.5%
Last action
Trimmed 3.3%
2025Q4
Current $297.64
51
DXCMDEXCOM INC
Healthcare·Medical Devices
0.36%
of portfolio
Number of shares
1,319,066 sh
Holdings current value
$123.07M
Avg closing price
$82.47
-22.4%
Last action
Trimmed 1.1%
2025Q4
Current $63.98
52
VRSNVERISIGN INC
Technology·Software - Infrastructure
0.35%
of portfolio
Number of shares
603,174 sh
Holdings current value
$122.16M
Avg closing price
$100.79
+171.9%
Last action
Trimmed 9.1%
2025Q4
Current $274.05
53
AREALEXANDRIA REAL ESTATE EQ INREIT
Real Estate·REIT - Office
0.35%
of portfolio
Number of shares
1,202,373 sh
Holdings current value
$120.36M
Avg closing price
$108.58
-55.2%
Last action
Exited
2025Q4
Current $48.63
54
CPNGCOUPANG INC
Consumer Cyclical·Internet Retail
0.34%
of portfolio
Number of shares
6,919,149 sh
Holdings current value
$117.63M
Avg closing price
$17.00
+26.7%
Last action
Trimmed 0.5%
2025Q4
Current $21.55
55
SHOPSHOPIFY INC
Technology·Software - Application
0.34%
of portfolio
Number of shares
2,146,351 sh
Holdings current value
$117.13M
Avg closing price
$100.58
+30.4%
Last action
Added 0.1%
2025Q4
Current $131.15
56
DNUTKRISPY KREME INC
Consumer Defensive·Grocery Stores
0.33%
of portfolio
Number of shares
9,221,657 sh
Holdings current value
$114.99M
Avg closing price
$12.64
-71.4%
Last action
Exited
2025Q2
Current $3.61
57
AZPN1USDASPEN TECHNOLOGY INC
0.33%
of portfolio
Number of shares
560,277 sh
Holdings current value
$114.44M
Avg closing price
$237.46
Last action
Exited
2025Q1
Current —
58
BYDBOYD GAMING CORP
Consumer Cyclical·Resorts & Casinos
0.33%
of portfolio
Number of shares
1,871,353 sh
Holdings current value
$113.83M
Avg closing price
$49.25
+77.7%
Last action
Trimmed 0.1%
2025Q1
Current $87.52
59
TRUTRANSUNION
Financial Services·Financial Data & Stock Exchanges
0.33%
of portfolio
Number of shares
1,582,926 sh
Holdings current value
$113.64M
Avg closing price
$53.76
+45.5%
Last action
Trimmed 0.6%
2025Q4
Current $78.25
60
NEOGNEOGEN CORP
Healthcare·Medical Devices
0.33%
of portfolio
Number of shares
6,067,987 sh
Holdings current value
$112.50M
Avg closing price
$23.50
-59.5%
Last action
Trimmed 18.1%
2025Q4
Current $9.51
61
VEEVVEEVA SYS INC
Healthcare·Health Information Services
0.32%
of portfolio
Number of shares
541,969 sh
Holdings current value
$110.26M
Avg closing price
$98.81
+70.0%
Last action
Trimmed 10.5%
2025Q4
Current $167.95
62
TDGTRANSDIGM GROUP INC
Industrials·Aerospace & Defense
0.31%
of portfolio
Number of shares
125,000 sh
Holdings current value
$105.39M
Avg closing price
$310.31
+307.9%
Last action
Trimmed 3.4%
2025Q4
Current $1266
63
PLDPROLOGIS INC.REIT
Real Estate·REIT - Industrial
0.30%
of portfolio
Number of shares
916,120 sh
Holdings current value
$102.80M
Avg closing price
$113.96
+27.3%
Last action
Added 31.2%
2025Q4
Current $145.10
64
ALTREURALTAIR ENGR INC
0.30%
of portfolio
Number of shares
1,635,507 sh
Holdings current value
$102.32M
Avg closing price
$24.14
Last action
Exited
2025Q1
Current —
65
AXNX*AXONICS INC
0.29%
of portfolio
Number of shares
1,799,731 sh
Holdings current value
$101.00M
Avg closing price
$42.18
Last action
Exited
2024Q2
Current —
66
CBRECBRE GROUP INC
Real Estate·Real Estate Services
0.28%
of portfolio
Number of shares
1,305,298 sh
Holdings current value
$96.41M
Avg closing price
$71.78
+111.1%
Last action
Trimmed 0.3%
2025Q4
Current $151.51
67
MELIMERCADOLIBRE INC
Consumer Cyclical·Internet Retail
0.28%
of portfolio
Number of shares
74,869 sh
Holdings current value
$94.92M
Avg closing price
$1029
+80.4%
Last action
Trimmed 0.9%
2025Q4
Current $1856
68
SPOTSPOTIFY TECHNOLOGY S A
Communication Services·Internet Content & Information
0.27%
of portfolio
Number of shares
598,090 sh
Holdings current value
$92.49M
Avg closing price
$264.41
+102.9%
Last action
Added 1.5%
2025Q4
Current $536.61
69
RBCRBC BEARINGS INC
Industrials·Tools & Accessories
0.26%
of portfolio
Number of shares
386,570 sh
Holdings current value
$90.51M
Avg closing price
$164.00
+259.6%
Last action
Trimmed 6.0%
2025Q4
Current $589.77
70
CDWCDW CORP
Technology·Information Technology Services
0.25%
of portfolio
Number of shares
429,537 sh
Holdings current value
$86.66M
Avg closing price
$70.60
+89.7%
Last action
Trimmed 6.7%
2025Q4
Current $133.96
71
DEIDOUGLAS EMMETT INCREIT
Real Estate·REIT - Office
0.25%
of portfolio
Number of shares
6,692,694 sh
Holdings current value
$85.40M
Avg closing price
$23.81
-56.1%
Last action
Trimmed 19.5%
2025Q4
Current $10.45
72
APHAMPHENOL CORP NEW
Technology·Electronic Components
0.25%
of portfolio
Number of shares
1,005,820 sh
Holdings current value
$84.48M
Avg closing price
$75.33
+100.5%
Last action
Trimmed 15.1%
2025Q4
Current $151.06
73
H5919C104ON HLDG AG
0.24%
of portfolio
Number of shares
3,028,002 sh
Holdings current value
$84.24M
Avg closing price
$35.38
Last action
Added 27.8%
2025Q4
Current —
74
REXRREXFORD INDL RLTY INCREIT
Real Estate·REIT - Industrial
0.24%
of portfolio
Number of shares
1,679,636 sh
Holdings current value
$82.89M
Avg closing price
$55.08
-32.8%
Last action
Exited
2024Q4
Current $37.01
75
IEXIDEX CORP
Industrials·Specialty Industrial Machinery
0.24%
of portfolio
Number of shares
395,756 sh
Holdings current value
$82.33M
Avg closing price
$97.86
+110.4%
Last action
Trimmed 27.2%
2025Q4
Current $205.92

Portfolio heatmap

Box size = % of portfolio · color = return since filing
TSLA
12.85% · +60.1%
ARCH CAP GROUP LTD
4.92%
IT
4.65% · -55.0%
CSGP
4.29% · -48.3%
FDS
3.50% · -46.8%
MSCI
3.37% · +10.8%
MTN
3.04% · -40.0%
IDXX
2.97% · +34.8%
KNSL
2.39% · -12.9%
IRDM
1.93% · -8.0%
AKX
1.73%
CHH
1.65% · -2.7%
H
1.64% · +62.6%
GWRE
1.63% · +56.0%
SCHW
1.29% · +68.1%
RRR
1.17% · +38.8%
WST
1.14% · -27.0%
GLPI
1.11% · +4.8%
PRI
1.09% · +40.7%
MTD
1.07% · +21.0%
TECH
1.06% · -13.0%
VRSK
0.92% · -24.6%
MORN
0.90% · -21.3%
VAC
0.80% · -25.5%

Sector exposure

Share of dollar value across the latest reported portfolio. Unclassified positions excluded.
  • Consumer Cyclical44 pos$9.84B32.4%
  • Financial Services34 pos$5.34B17.6%
  • Technology70 pos$5.23B17.2%
  • Healthcare48 pos$3.26B10.7%
  • Real Estate30 pos$2.97B9.8%
  • Industrials28 pos$2.10B6.9%
  • Communication Services14 pos$1.29B4.2%
  • Consumer Defensive8 pos$260.4M0.9%
  • Basic Materials5 pos$100.9M0.3%
  • Energy1 pos$30K0.0%
(11.7% unclassified, excluded from %)