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Built from publicly disclosed institutional and insider activity. Informational purposes only - not investment advice.OpenStocks · v0.1
Logos by elbstream.com
  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 · 2024Q3
1 / 5
75 of 328
1
TSLATESLA INC
Consumer Cyclical·Auto Manufacturers
10.36%
of portfolio
Number of shares
14,928,529 sh
Holdings current value
$3.91B
Avg closing price
$304.15
+31.7%
Last action
Trimmed 0.1%
2025Q4
Current $400.62
2
G0450A105ARCH CAP GROUP LTD
6.15%
of portfolio
Number of shares
20,725,357 sh
Holdings current value
$2.32B
Avg closing price
$41.90
Last action
Trimmed 3.6%
2025Q4
Current —
3
ITGARTNER INC
Technology·Information Technology Services
5.41%
of portfolio
Number of shares
4,022,384 sh
Holdings current value
$2.04B
Avg closing price
$116.73
+32.5%
Last action
Trimmed 2.6%
2025Q4
Current $154.62
4
CSGPCOSTAR GROUP INC
Real Estate·Real Estate Services
3.76%
of portfolio
Number of shares
18,785,436 sh
Holdings current value
$1.42B
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
3.34%
of portfolio
Number of shares
2,157,431 sh
Holdings current value
$1.26B
Avg closing price
$231.43
+145.7%
Last action
Added 20.1%
2025Q4
Current $568.55
6
FDSFACTSET RESH SYS INC
Financial Services·Financial Data & Stock Exchanges
3.02%
of portfolio
Number of shares
2,478,027 sh
Holdings current value
$1.14B
Avg closing price
$212.07
+9.7%
Last action
Added 76.0%
2025Q4
Current $232.73
7
GWREGUIDEWIRE SOFTWARE INC
Technology·Software - Application
2.92%
of portfolio
Number of shares
6,008,129 sh
Holdings current value
$1.10B
Avg closing price
$65.03
+115.8%
Last action
Trimmed 0.4%
2025Q4
Current $140.36
8
IDXXIDEXX LABS INC
Healthcare·Diagnostics & Research
2.58%
of portfolio
Number of shares
1,923,258 sh
Holdings current value
$971.67M
Avg closing price
$104.10
+466.1%
Last action
Trimmed 4.3%
2025Q4
Current $589.25
9
MTNVAIL RESORTS INC
Consumer Cyclical·Resorts & Casinos
2.40%
of portfolio
Number of shares
5,185,136 sh
Holdings current value
$903.72M
Avg closing price
$152.03
-12.4%
Last action
Trimmed 14.7%
2025Q4
Current $133.22
10
HHYATT HOTELS CORP
Consumer Cyclical·Lodging
2.21%
of portfolio
Number of shares
5,483,404 sh
Holdings current value
$834.57M
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
2.16%
of portfolio
Number of shares
1,745,415 sh
Holdings current value
$812.61M
Avg closing price
$84.46
+327.2%
Last action
Trimmed 0.4%
2025Q4
Current $360.78
12
CHHCHOICE HOTELS INTL INC
Consumer Cyclical·Lodging
1.63%
of portfolio
Number of shares
4,716,314 sh
Holdings current value
$614.54M
Avg closing price
$73.55
+62.1%
Last action
Added 75.4%
2025Q4
Current $119.19
13
RRRRED ROCK RESORTS INC
Consumer Cyclical·Resorts & Casinos
1.53%
of portfolio
Number of shares
10,623,284 sh
Holdings current value
$578.33M
Avg closing price
$33.63
+69.2%
Last action
Added 2.4%
2025Q4
Current $56.91
14
AKXANSYS INC
1.36%
of portfolio
Number of shares
1,612,262 sh
Holdings current value
$513.72M
Avg closing price
$102.95
Last action
Exited
2025Q3
Current —
15
SCHWSCHWAB CHARLES CORP
Financial Services·Capital Markets
1.25%
of portfolio
Number of shares
7,269,280 sh
Holdings current value
$471.12M
Avg closing price
$35.45
+160.3%
Last action
Trimmed 1.0%
2025Q4
Current $92.28
16
PRIPRIMERICA INC
Financial Services·Insurance - Life
1.20%
of portfolio
Number of shares
1,712,011 sh
Holdings current value
$453.94M
Avg closing price
$44.69
+510.7%
Last action
Trimmed 13.9%
2025Q4
Current $272.89
17
MTDMETTLER TOLEDO INTERNATIONAL
Healthcare·Diagnostics & Research
1.15%
of portfolio
Number of shares
288,747 sh
Holdings current value
$433.03M
Avg closing price
$345.85
+287.6%
Last action
Trimmed 18.4%
2025Q4
Current $1341
18
GLPIGAMING & LEISURE PPTYS INCREIT
Real Estate·REIT - Specialty
1.11%
of portfolio
Number of shares
8,107,784 sh
Holdings current value
$417.15M
Avg closing price
$32.44
+47.1%
Last action
Trimmed 28.8%
2025Q4
Current $47.73
19
MORNMORNINGSTAR INC
Financial Services·Financial Data & Stock Exchanges
1.11%
of portfolio
Number of shares
1,305,588 sh
Holdings current value
$416.64M
Avg closing price
$117.66
+56.6%
Last action
Trimmed 11.7%
2025Q4
Current $184.28
20
NVDANVIDIA CORPORATION
Technology·Semiconductors
0.96%
of portfolio
Number of shares
2,993,580 sh
Holdings current value
$363.54M
Avg closing price
$142.81
+41.2%
Last action
Added 0.1%
2025Q4
Current $201.68
21
TECHBIO-TECHNE CORP
Healthcare·Biotechnology
0.94%
of portfolio
Number of shares
4,445,540 sh
Holdings current value
$355.33M
Avg closing price
$87.15
-32.0%
Last action
Trimmed 22.5%
2025Q4
Current $59.23
22
VRTVERTIV HOLDINGS CO
Industrials·Electrical Equipment & Parts
0.94%
of portfolio
Number of shares
3,550,000 sh
Holdings current value
$353.19M
Avg closing price
$13.22
+2225.3%
Last action
Trimmed 12.9%
2025Q4
Current $307.34
23
VRSKVERISK ANALYTICS INC
Industrials·Consulting Services
0.90%
of portfolio
Number of shares
1,268,534 sh
Holdings current value
$339.92M
Avg closing price
$110.27
+61.5%
Last action
Added 6.9%
2025Q4
Current $178.07
24
IRDMIRIDIUM COMMUNICATIONS INC
Communication Services·Telecom Services
0.90%
of portfolio
Number of shares
11,118,785 sh
Holdings current value
$338.57M
Avg closing price
$18.33
+128.3%
Last action
Trimmed 4.2%
2025Q4
Current $41.85
25
SPOTSPOTIFY TECHNOLOGY S A
Communication Services·Internet Content & Information
0.86%
of portfolio
Number of shares
882,147 sh
Holdings current value
$325.10M
Avg closing price
$264.41
+102.9%
Last action
Added 1.0%
2025Q4
Current $536.61
26
G4705A100ICON PLC
0.73%
of portfolio
Number of shares
954,056 sh
Holdings current value
$274.11M
Avg closing price
$141.00
Last action
Trimmed 13.6%
2025Q4
Current —
27
MSFTMICROSOFT CORP
Technology·Software - Infrastructure
0.66%
of portfolio
Number of shares
577,172 sh
Holdings current value
$248.36M
Avg closing price
$231.09
+83.0%
Last action
Added 1.1%
2025Q4
Current $422.79
28
SITESITEONE LANDSCAPE SUPPLY INC
Industrials·Industrial Distribution
0.63%
of portfolio
Number of shares
1,580,342 sh
Holdings current value
$238.49M
Avg closing price
$94.03
+53.5%
Last action
Added 4.0%
2025Q4
Current $144.35
29
SHOPSHOPIFY INC
Technology·Software - Application
0.58%
of portfolio
Number of shares
2,720,481 sh
Holdings current value
$218.02M
Avg closing price
$100.58
+30.4%
Last action
Added 0.1%
2025Q4
Current $131.15
30
DAYCERIDIAN HCM HLDG INC
0.57%
of portfolio
Number of shares
3,527,637 sh
Holdings current value
$216.07M
Avg closing price
$45.74
+52.7%
Last action
Exited
2025Q4
Current $69.86
31
EQIXEQUINIX INCREIT
Real Estate·REIT - Specialty
0.57%
of portfolio
Number of shares
242,133 sh
Holdings current value
$214.92M
Avg closing price
$693.09
+57.1%
Last action
Trimmed 12.0%
2025Q4
Current $1089
32
BFAMBRIGHT HORIZONS FAM SOL IN D
Consumer Cyclical·Personal Services
0.55%
of portfolio
Number of shares
1,489,337 sh
Holdings current value
$208.70M
Avg closing price
$74.96
+13.1%
Last action
Added 5.3%
2025Q4
Current $84.76
33
FIGSFIGS INC
Consumer Cyclical·Apparel Manufacturing
0.54%
of portfolio
Number of shares
30,030,078 sh
Holdings current value
$205.41M
Avg closing price
$7.14
+126.4%
Last action
Added 0.1%
2025Q4
Current $16.17
34
AMZNAMAZON COM INC
Consumer Cyclical·Internet Retail
0.54%
of portfolio
Number of shares
1,095,502 sh
Holdings current value
$204.12M
Avg closing price
$201.71
+24.2%
Last action
Added 15.5%
2025Q4
Current $250.56
35
TTDTHE TRADE DESK INC
Communication Services·Advertising Agencies
0.53%
of portfolio
Number of shares
1,819,538 sh
Holdings current value
$199.51M
Avg closing price
$69.39
-67.6%
Last action
Trimmed 41.6%
2025Q4
Current $22.47
36
CNSCOHEN & STEERS INC
Financial Services·Asset Management
0.51%
of portfolio
Number of shares
2,009,504 sh
Holdings current value
$192.81M
Avg closing price
$49.54
+34.6%
Last action
Trimmed 43.8%
2025Q4
Current $66.67
37
FICOFAIR ISAAC CORP
Technology·Software - Application
0.49%
of portfolio
Number of shares
95,870 sh
Holdings current value
$186.33M
Avg closing price
$384.07
+179.5%
Last action
Trimmed 7.0%
2025Q4
Current $1074
38
HLIHOULIHAN LOKEY INC
Financial Services·Capital Markets
0.48%
of portfolio
Number of shares
1,144,679 sh
Holdings current value
$180.88M
Avg closing price
$46.69
+248.1%
Last action
Trimmed 0.5%
2025Q4
Current $162.50
39
ASGNASGN INC
Technology·Information Technology Services
0.47%
of portfolio
Number of shares
1,894,200 sh
Holdings current value
$176.60M
Avg closing price
$80.58
-51.1%
Last action
Trimmed 0.6%
2025Q4
Current $39.44
40
TSMTAIWAN SEMICONDUCTOR MFG LTDADR
Technology·Semiconductors
0.44%
of portfolio
Number of shares
960,740 sh
Holdings current value
$166.85M
Avg closing price
$96.33
+284.6%
Last action
Added 3.1%
2025Q4
Current $370.50
41
CPNGCOUPANG INC
Consumer Cyclical·Internet Retail
0.44%
of portfolio
Number of shares
6,793,580 sh
Holdings current value
$166.78M
Avg closing price
$17.00
+26.7%
Last action
Trimmed 0.5%
2025Q4
Current $21.55
42
METAMETA PLATFORMS INC
Communication Services·Internet Content & Information
0.43%
of portfolio
Number of shares
284,930 sh
Holdings current value
$163.11M
Avg closing price
$244.55
+181.6%
Last action
Added 1.8%
2025Q4
Current $688.55
43
CBRECBRE GROUP INC
Real Estate·Real Estate Services
0.43%
of portfolio
Number of shares
1,299,831 sh
Holdings current value
$161.80M
Avg closing price
$71.78
+111.1%
Last action
Trimmed 0.3%
2025Q4
Current $151.51
44
H5919C104ON HLDG AG
0.42%
of portfolio
Number of shares
3,156,895 sh
Holdings current value
$158.32M
Avg closing price
$35.38
Last action
Added 26.4%
2025Q4
Current —
45
FNDFLOOR & DECOR HLDGS INC
Consumer Cyclical·Home Improvement Retail
0.41%
of portfolio
Number of shares
1,252,755 sh
Holdings current value
$155.55M
Avg closing price
$60.90
-11.2%
Last action
Trimmed 12.1%
2025Q4
Current $54.07
46
M2029K104BIRKENSTOCK HOLDING PLC
0.41%
of portfolio
Number of shares
3,102,507 sh
Holdings current value
$152.92M
Avg closing price
$46.40
Last action
Added 108.2%
2025Q4
Current —
47
BABAALIBABA GROUP HLDG LTDADR
Consumer Cyclical·Internet Retail
0.40%
of portfolio
Number of shares
1,434,625 sh
Holdings current value
$152.24M
Avg closing price
$137.00
+2.9%
Last action
Added 5.0%
2025Q4
Current $141.01
48
TDGTRANSDIGM GROUP INC
Industrials·Aerospace & Defense
0.40%
of portfolio
Number of shares
105,859 sh
Holdings current value
$151.07M
Avg closing price
$310.31
+307.9%
Last action
Trimmed 3.9%
2025Q4
Current $1266
49
BWINBRP GROUP INC
Financial Services·Insurance Brokers
0.40%
of portfolio
Number of shares
3,010,000 sh
Holdings current value
$149.90M
Avg closing price
$18.30
+36.9%
Last action
Added 0.0%
2025Q4
Current $25.04
50
WSTWEST PHARMACEUTICAL SVSC INC
Healthcare·Medical Instruments & Supplies
0.39%
of portfolio
Number of shares
483,842 sh
Holdings current value
$145.23M
Avg closing price
$69.77
+292.3%
Last action
Trimmed 7.2%
2025Q4
Current $273.73
51
ROPROPER TECHNOLOGIES INC
Technology·Software - Application
0.38%
of portfolio
Number of shares
257,797 sh
Holdings current value
$143.45M
Avg closing price
$214.42
+69.0%
Last action
Trimmed 6.7%
2025Q4
Current $362.44
52
TOLTOLL BROTHERS INC
Consumer Cyclical·Residential Construction
0.37%
of portfolio
Number of shares
897,503 sh
Holdings current value
$138.66M
Avg closing price
$89.29
+64.3%
Last action
Added 1.1%
2025Q4
Current $146.68
53
INTAINTAPP INC
Technology·Software - Application
0.36%
of portfolio
Number of shares
2,850,455 sh
Holdings current value
$136.34M
Avg closing price
$37.65
-39.4%
Last action
Added 18.6%
2025Q4
Current $22.82
54
ARGXARGENX SEADR
Healthcare·Biotechnology
0.36%
of portfolio
Number of shares
250,304 sh
Holdings current value
$135.68M
Avg closing price
$243.37
+248.9%
Last action
Trimmed 5.3%
2025Q4
Current $849.04
55
TREXTREX CO INC
Industrials·Building Products & Equipment
0.36%
of portfolio
Number of shares
2,026,692 sh
Holdings current value
$134.94M
Avg closing price
$65.01
-34.2%
Last action
Exited
2025Q4
Current $42.77
56
CWANCLEARWATER ANALYTICS HLDGS I
Technology·Software - Application
0.36%
of portfolio
Number of shares
5,326,574 sh
Holdings current value
$134.50M
Avg closing price
$20.56
+17.2%
Last action
Added 2.7%
2025Q4
Current $24.11
57
LENLENNAR CORP
Consumer Cyclical·Residential Construction
0.35%
of portfolio
Number of shares
711,023 sh
Holdings current value
$133.30M
Avg closing price
$97.47
-4.8%
Last action
Exited
2025Q2
Current $92.79
58
IBKRINTERACTIVE BROKERS GROUP IN
Financial Services·Capital Markets
0.34%
of portfolio
Number of shares
912,608 sh
Holdings current value
$127.18M
Avg closing price
$63.76
+28.2%
Last action
Added 3.8%
2025Q4
Current $81.71
59
GTLSCHART INDS INC
Industrials·Specialty Industrial Machinery
0.34%
of portfolio
Number of shares
1,022,664 sh
Holdings current value
$126.95M
Avg closing price
$139.72
+49.1%
Last action
Exited
2025Q3
Current $208.30
60
WELLWELLTOWER INCREIT
Real Estate·REIT - Healthcare Facilities
0.33%
of portfolio
Number of shares
974,759 sh
Holdings current value
$124.80M
Avg closing price
$107.71
+95.5%
Last action
Added 10.2%
2025Q4
Current $210.52
61
DHID R HORTON INC
Consumer Cyclical·Residential Construction
0.33%
of portfolio
Number of shares
646,888 sh
Holdings current value
$123.41M
Avg closing price
$89.90
+66.6%
Last action
Exited
2025Q4
Current $149.81
62
GDSGDS HLDGS LTDADR
Technology·Information Technology Services
0.33%
of portfolio
Number of shares
6,040,555 sh
Holdings current value
$123.23M
Avg closing price
$22.66
+97.2%
Last action
Trimmed 7.3%
2025Q4
Current $44.70
63
NEOGNEOGEN CORP
Healthcare·Medical Devices
0.33%
of portfolio
Number of shares
7,303,115 sh
Holdings current value
$122.77M
Avg closing price
$23.50
-59.5%
Last action
Trimmed 15.5%
2025Q4
Current $9.51
64
IBPINSTALLED BLDG PRODS INC
Consumer Cyclical·Residential Construction
0.32%
of portfolio
Number of shares
492,286 sh
Holdings current value
$121.24M
Avg closing price
$83.49
+256.5%
Last action
Trimmed 6.6%
2025Q4
Current $297.64
65
APHAMPHENOL CORP NEW
Technology·Electronic Components
0.32%
of portfolio
Number of shares
1,853,278 sh
Holdings current value
$120.76M
Avg closing price
$75.33
+100.5%
Last action
Trimmed 8.8%
2025Q4
Current $151.06
66
ALTREURALTAIR ENGR INC
0.32%
of portfolio
Number of shares
1,259,344 sh
Holdings current value
$120.28M
Avg closing price
$24.14
Last action
Exited
2025Q1
Current —
67
BXBLACKSTONE INC
Financial Services·Asset Management
0.31%
of portfolio
Number of shares
769,894 sh
Holdings current value
$117.89M
Avg closing price
$119.44
+8.1%
Last action
Trimmed 4.5%
2025Q4
Current $129.08
68
DNUTKRISPY KREME INC
Consumer Defensive·Grocery Stores
0.30%
of portfolio
Number of shares
10,481,319 sh
Holdings current value
$112.57M
Avg closing price
$12.64
-71.4%
Last action
Exited
2025Q2
Current $3.61
69
DEIDOUGLAS EMMETT INCREIT
Real Estate·REIT - Office
0.30%
of portfolio
Number of shares
6,389,444 sh
Holdings current value
$112.26M
Avg closing price
$23.81
-56.1%
Last action
Trimmed 20.3%
2025Q4
Current $10.45
70
AZPN1USDASPEN TECHNOLOGY INC
0.30%
of portfolio
Number of shares
468,011 sh
Holdings current value
$111.77M
Avg closing price
$237.46
Last action
Exited
2025Q1
Current —
71
MELIMERCADOLIBRE INC
Consumer Cyclical·Internet Retail
0.29%
of portfolio
Number of shares
52,453 sh
Holdings current value
$107.63M
Avg closing price
$1029
+80.4%
Last action
Trimmed 1.3%
2025Q4
Current $1856
72
COOCOOPER COS INC
Healthcare·Medical Instruments & Supplies
0.28%
of portfolio
Number of shares
939,982 sh
Holdings current value
$103.72M
Avg closing price
$101.38
-30.9%
Last action
Added 0.1%
2025Q4
Current $70.06
73
BNBROOKFIELD CORP
Financial Services·Asset Management
0.27%
of portfolio
Number of shares
1,949,472 sh
Holdings current value
$103.61M
Avg closing price
$46.67
-0.2%
Last action
Added 172.3%
2025Q4
Current $46.59
74
KTOSKRATOS DEFENSE & SEC SOLUTIO
Industrials·Aerospace & Defense
0.27%
of portfolio
Number of shares
4,374,077 sh
Holdings current value
$101.92M
Avg closing price
$16.97
+318.3%
Last action
Trimmed 14.2%
2025Q4
Current $70.99
75
AXONAXON ENTERPRISE INC
Industrials·Aerospace & Defense
0.27%
of portfolio
Number of shares
254,141 sh
Holdings current value
$101.55M
Avg closing price
$339.24
+18.8%
Last action
Added 24.0%
2025Q4
Current $402.85

Portfolio heatmap

Box size = % of portfolio · color = return since filing
TSLA
10.36% · +53.1%
ARCH CAP GROUP LTD
6.15%
IT
5.41% · -69.5%
CSGP
3.76% · -47.3%
MSCI
3.34% · -2.5%
FDS
3.02% · -49.4%
GWRE
2.92% · -23.3%
IDXX
2.58% · +16.6%
MTN
2.40% · -23.6%
H
2.21% · +13.3%
KNSL
2.16% · -22.5%
CHH
1.63% · -8.5%
RRR
1.53% · +4.5%
AKX
1.36%
SCHW
1.25% · +42.4%
PRI
1.20% · +2.9%
MTD
1.15% · -10.6%
GLPI
1.11% · -7.2%
MORN
1.11% · -42.3%
NVDA
0.96% · +66.1%
TECH
0.94% · -25.9%
VRT
0.94% · +208.9%
VRSK
0.90% · -33.5%
IRDM
0.90% · +37.4%

Sector exposure

Share of dollar value across the latest reported portfolio. Unclassified positions excluded.
  • Consumer Cyclical44 pos$9.51B28.7%
  • Technology61 pos$6.87B20.7%
  • Financial Services36 pos$6.06B18.3%
  • Real Estate34 pos$3.29B9.9%
  • Healthcare57 pos$3.24B9.8%
  • Industrials33 pos$2.48B7.5%
  • Communication Services14 pos$1.30B3.9%
  • Basic Materials6 pos$231.4M0.7%
  • Consumer Defensive5 pos$177.0M0.5%
(12.0% unclassified, excluded from %)