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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 · 2023Q1
1 / 5
75 of 360
1
TSLATESLA INC
Consumer Cyclical·Auto Manufacturers
10.97%
of portfolio
Number of shares
17,606,894 sh
Holdings current value
$3.65B
Avg closing price
$304.15
+31.7%
Last action
Trimmed 0.1%
2025Q4
Current $400.62
2
ITGARTNER INC
Technology·Information Technology Services
4.69%
of portfolio
Number of shares
4,796,458 sh
Holdings current value
$1.56B
Avg closing price
$116.73
+32.5%
Last action
Trimmed 2.2%
2025Q4
Current $154.62
3
G0450A105ARCH CAP GROUP LTD
4.34%
of portfolio
Number of shares
21,290,775 sh
Holdings current value
$1.45B
Avg closing price
$41.90
Last action
Trimmed 3.5%
2025Q4
Current —
4
CSGPCOSTAR GROUP INC
Real Estate·Real Estate Services
3.92%
of portfolio
Number of shares
18,970,081 sh
Holdings current value
$1.31B
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
3.65%
of portfolio
Number of shares
2,172,566 sh
Holdings current value
$1.22B
Avg closing price
$231.43
+145.7%
Last action
Added 20.0%
2025Q4
Current $568.55
6
IDXXIDEXX LABS INC
Healthcare·Diagnostics & Research
3.54%
of portfolio
Number of shares
2,356,243 sh
Holdings current value
$1.18B
Avg closing price
$104.10
+466.1%
Last action
Trimmed 3.5%
2025Q4
Current $589.25
7
FDSFACTSET RESH SYS INC
Financial Services·Financial Data & Stock Exchanges
3.36%
of portfolio
Number of shares
2,698,268 sh
Holdings current value
$1.12B
Avg closing price
$212.07
+9.7%
Last action
Added 65.7%
2025Q4
Current $232.73
8
MTNVAIL RESORTS INC
Consumer Cyclical·Resorts & Casinos
3.25%
of portfolio
Number of shares
4,629,113 sh
Holdings current value
$1.08B
Avg closing price
$152.03
-12.4%
Last action
Trimmed 16.2%
2025Q4
Current $133.22
9
IRDMIRIDIUM COMMUNICATIONS INC
Communication Services·Telecom Services
2.68%
of portfolio
Number of shares
14,440,447 sh
Holdings current value
$894.30M
Avg closing price
$18.33
+128.3%
Last action
Trimmed 3.2%
2025Q4
Current $41.85
10
AKXANSYS INC
1.96%
of portfolio
Number of shares
1,962,217 sh
Holdings current value
$653.03M
Avg closing price
$102.95
Last action
Exited
2025Q3
Current —
11
KNSLKINSALE CAP GROUP INC
Financial Services·Insurance - Property & Casualty
1.87%
of portfolio
Number of shares
2,074,765 sh
Holdings current value
$622.74M
Avg closing price
$84.46
+327.2%
Last action
Trimmed 0.4%
2025Q4
Current $360.78
12
HHYATT HOTELS CORP
Consumer Cyclical·Lodging
1.73%
of portfolio
Number of shares
5,148,507 sh
Holdings current value
$575.55M
Avg closing price
$67.76
+154.5%
Last action
Trimmed 0.2%
2025Q4
Current $172.48
13
CHHCHOICE HOTELS INTL INC
Consumer Cyclical·Lodging
1.61%
of portfolio
Number of shares
4,573,432 sh
Holdings current value
$535.96M
Avg closing price
$73.55
+62.1%
Last action
Added 79.6%
2025Q4
Current $119.19
14
MTDMETTLER TOLEDO INTERNATIONAL
Healthcare·Diagnostics & Research
1.54%
of portfolio
Number of shares
335,056 sh
Holdings current value
$512.71M
Avg closing price
$345.85
+287.6%
Last action
Trimmed 16.3%
2025Q4
Current $1341
15
GWREGUIDEWIRE SOFTWARE INC
Technology·Software - Application
1.50%
of portfolio
Number of shares
6,106,230 sh
Holdings current value
$501.02M
Avg closing price
$65.03
+115.8%
Last action
Trimmed 0.3%
2025Q4
Current $140.36
16
GLPIGAMING & LEISURE PPTYS INCREIT
Real Estate·REIT - Specialty
1.32%
of portfolio
Number of shares
8,470,246 sh
Holdings current value
$440.96M
Avg closing price
$32.44
+47.1%
Last action
Trimmed 27.9%
2025Q4
Current $47.73
17
SCHWSCHWAB CHARLES CORP
Financial Services·Capital Markets
1.20%
of portfolio
Number of shares
7,630,034 sh
Holdings current value
$399.66M
Avg closing price
$35.45
+160.3%
Last action
Trimmed 0.9%
2025Q4
Current $92.28
18
TECHBIO-TECHNE CORP
Healthcare·Biotechnology
1.20%
of portfolio
Number of shares
5,379,492 sh
Holdings current value
$399.10M
Avg closing price
$87.15
-32.0%
Last action
Trimmed 19.3%
2025Q4
Current $59.23
19
TSMTAIWAN SEMICONDUCTOR MFG LTDADR
Technology·Semiconductors
1.20%
of portfolio
Number of shares
4,280,903 sh
Holdings current value
$398.21M
Avg closing price
$96.33
+284.6%
Last action
Added 0.7%
2025Q4
Current $370.50
20
RRRRED ROCK RESORTS INC
Consumer Cyclical·Resorts & Casinos
1.13%
of portfolio
Number of shares
8,470,525 sh
Holdings current value
$377.53M
Avg closing price
$33.63
+69.2%
Last action
Added 3.1%
2025Q4
Current $56.91
21
VACMARRIOTT VACATIONS WORLDWIDE
Consumer Cyclical·Resorts & Casinos
1.13%
of portfolio
Number of shares
2,785,321 sh
Holdings current value
$375.63M
Avg closing price
$95.52
-21.5%
Last action
Trimmed 0.0%
2025Q3
Current $74.98
22
WSTWEST PHARMACEUTICAL SVSC INC
Healthcare·Medical Instruments & Supplies
1.11%
of portfolio
Number of shares
1,065,115 sh
Holdings current value
$369.03M
Avg closing price
$69.77
+292.3%
Last action
Trimmed 3.4%
2025Q4
Current $273.73
23
PRIPRIMERICA INC
Financial Services·Insurance - Life
1.01%
of portfolio
Number of shares
1,947,263 sh
Holdings current value
$335.40M
Avg closing price
$44.69
+510.7%
Last action
Trimmed 12.4%
2025Q4
Current $272.89
24
DAYCERIDIAN HCM HLDG INC
0.76%
of portfolio
Number of shares
3,467,698 sh
Holdings current value
$253.90M
Avg closing price
$45.74
+52.7%
Last action
Exited
2025Q4
Current $69.86
25
FNDFLOOR & DECOR HLDGS INC
Consumer Cyclical·Home Improvement Retail
0.76%
of portfolio
Number of shares
2,579,551 sh
Holdings current value
$253.36M
Avg closing price
$60.90
-11.2%
Last action
Trimmed 6.3%
2025Q4
Current $54.07
26
VRSKVERISK ANALYTICS INC
Industrials·Consulting Services
0.75%
of portfolio
Number of shares
1,306,304 sh
Holdings current value
$250.63M
Avg closing price
$110.27
+61.5%
Last action
Added 6.7%
2025Q4
Current $178.07
27
BABAALIBABA GROUP HLDG LTDADR
Consumer Cyclical·Internet Retail
0.69%
of portfolio
Number of shares
2,251,648 sh
Holdings current value
$230.07M
Avg closing price
$137.00
+2.9%
Last action
Added 3.1%
2025Q4
Current $141.01
28
MORNMORNINGSTAR INC
Financial Services·Financial Data & Stock Exchanges
0.69%
of portfolio
Number of shares
1,128,519 sh
Holdings current value
$229.12M
Avg closing price
$117.66
+56.6%
Last action
Trimmed 13.3%
2025Q4
Current $184.28
29
PENNPENN NATL GAMING INC
Consumer Cyclical·Resorts & Casinos
0.68%
of portfolio
Number of shares
7,659,384 sh
Holdings current value
$227.18M
Avg closing price
$20.07
-21.0%
Last action
Exited
2024Q2
Current $15.85
30
G4705A100ICON PLC
0.63%
of portfolio
Number of shares
987,977 sh
Holdings current value
$211.02M
Avg closing price
$141.00
Last action
Trimmed 13.2%
2025Q4
Current —
31
SITESITEONE LANDSCAPE SUPPLY INC
Industrials·Industrial Distribution
0.61%
of portfolio
Number of shares
1,487,105 sh
Holdings current value
$203.54M
Avg closing price
$94.03
+53.5%
Last action
Added 4.3%
2025Q4
Current $144.35
32
CNSCOHEN & STEERS INC
Financial Services·Asset Management
0.55%
of portfolio
Number of shares
2,848,920 sh
Holdings current value
$182.22M
Avg closing price
$49.54
+34.6%
Last action
Trimmed 35.4%
2025Q4
Current $66.67
33
ASGNASGN INC
Technology·Information Technology Services
0.53%
of portfolio
Number of shares
2,130,981 sh
Holdings current value
$176.17M
Avg closing price
$80.58
-51.1%
Last action
Trimmed 0.5%
2025Q4
Current $39.44
34
BFAMBRIGHT HORIZONS FAM SOL IN D
Consumer Cyclical·Personal Services
0.52%
of portfolio
Number of shares
2,238,271 sh
Holdings current value
$172.32M
Avg closing price
$74.96
+13.1%
Last action
Added 3.4%
2025Q4
Current $84.76
35
DXCMDEXCOM INC
Healthcare·Medical Devices
0.50%
of portfolio
Number of shares
1,437,140 sh
Holdings current value
$166.97M
Avg closing price
$82.47
-22.4%
Last action
Trimmed 1.0%
2025Q4
Current $63.98
36
DAVAENDAVA PLCADR
Technology·Software - Infrastructure
0.49%
of portfolio
Number of shares
2,437,049 sh
Holdings current value
$163.72M
Avg closing price
$47.74
-89.9%
Last action
Exited
2025Q4
Current $4.84
37
AREALEXANDRIA REAL ESTATE EQ INREIT
Real Estate·REIT - Office
0.47%
of portfolio
Number of shares
1,251,863 sh
Holdings current value
$157.22M
Avg closing price
$108.58
-55.2%
Last action
Exited
2025Q4
Current $48.63
38
NVDANVIDIA CORPORATION
Technology·Semiconductors
0.45%
of portfolio
Number of shares
540,614 sh
Holdings current value
$150.17M
Avg closing price
$142.81
+41.2%
Last action
Added 0.7%
2025Q4
Current $201.68
39
SBACSBA COMMUNICATIONS CORP NEWREIT
Real Estate·REIT - Specialty
0.44%
of portfolio
Number of shares
560,491 sh
Holdings current value
$146.33M
Avg closing price
$142.71
+56.4%
Last action
Trimmed 2.4%
2025Q3
Current $223.14
40
MSFTMICROSOFT CORP
Technology·Software - Infrastructure
0.42%
of portfolio
Number of shares
484,483 sh
Holdings current value
$139.68M
Avg closing price
$231.09
+83.0%
Last action
Added 1.3%
2025Q4
Current $422.79
41
VRSNVERISIGN INC
Technology·Software - Infrastructure
0.41%
of portfolio
Number of shares
647,247 sh
Holdings current value
$136.78M
Avg closing price
$100.79
+171.9%
Last action
Trimmed 8.5%
2025Q4
Current $274.05
42
VEEVVEEVA SYS INC
Healthcare·Health Information Services
0.41%
of portfolio
Number of shares
738,802 sh
Holdings current value
$135.78M
Avg closing price
$98.81
+70.0%
Last action
Trimmed 7.9%
2025Q4
Current $167.95
43
BYDBOYD GAMING CORP
Consumer Cyclical·Resorts & Casinos
0.41%
of portfolio
Number of shares
2,115,907 sh
Holdings current value
$135.67M
Avg closing price
$49.25
+77.7%
Last action
Trimmed 0.1%
2025Q1
Current $87.52
44
TREXTREX CO INC
Industrials·Building Products & Equipment
0.40%
of portfolio
Number of shares
2,722,862 sh
Holdings current value
$132.52M
Avg closing price
$65.01
-34.2%
Last action
Exited
2025Q4
Current $42.77
45
FIGSFIGS INC
Consumer Cyclical·Apparel Manufacturing
0.39%
of portfolio
Number of shares
20,866,767 sh
Holdings current value
$129.17M
Avg closing price
$7.14
+126.4%
Last action
Added 0.1%
2025Q4
Current $16.17
46
AZPN1USDASPEN TECHNOLOGY INC
0.38%
of portfolio
Number of shares
555,822 sh
Holdings current value
$127.21M
Avg closing price
$237.46
Last action
Exited
2025Q1
Current —
47
GTLSCHART INDS INC
Industrials·Specialty Industrial Machinery
0.38%
of portfolio
Number of shares
1,007,228 sh
Holdings current value
$126.31M
Avg closing price
$139.72
+49.1%
Last action
Exited
2025Q3
Current $208.30
48
EQIXEQUINIX INCREIT
Real Estate·REIT - Specialty
0.38%
of portfolio
Number of shares
174,084 sh
Holdings current value
$125.52M
Avg closing price
$693.09
+57.1%
Last action
Trimmed 15.9%
2025Q4
Current $1089
49
ROPROPER TECHNOLOGIES INC
Technology·Software - Application
0.38%
of portfolio
Number of shares
284,686 sh
Holdings current value
$125.46M
Avg closing price
$214.42
+69.0%
Last action
Trimmed 6.1%
2025Q4
Current $362.44
50
ALTREURALTAIR ENGR INC
0.35%
of portfolio
Number of shares
1,635,507 sh
Holdings current value
$117.94M
Avg closing price
$24.14
Last action
Exited
2025Q1
Current —
51
FICOFAIR ISAAC CORP
Technology·Software - Application
0.35%
of portfolio
Number of shares
167,405 sh
Holdings current value
$117.63M
Avg closing price
$384.07
+179.5%
Last action
Trimmed 4.1%
2025Q4
Current $1074
52
HLIHOULIHAN LOKEY INC
Financial Services·Capital Markets
0.34%
of portfolio
Number of shares
1,298,577 sh
Holdings current value
$113.61M
Avg closing price
$46.69
+248.1%
Last action
Trimmed 0.5%
2025Q4
Current $162.50
53
PLDPROLOGIS INC.REIT
Real Estate·REIT - Industrial
0.34%
of portfolio
Number of shares
902,494 sh
Holdings current value
$112.60M
Avg closing price
$113.96
+27.3%
Last action
Added 31.8%
2025Q4
Current $145.10
54
TTDTHE TRADE DESK INC
Communication Services·Advertising Agencies
0.34%
of portfolio
Number of shares
1,846,053 sh
Holdings current value
$112.44M
Avg closing price
$69.39
-67.6%
Last action
Trimmed 41.3%
2025Q4
Current $22.47
55
ILMNILLUMINA INC
Healthcare·Diagnostics & Research
0.33%
of portfolio
Number of shares
473,231 sh
Holdings current value
$110.05M
Avg closing price
$138.13
-2.6%
Last action
Added 2.5%
2025Q4
Current $134.50
56
VRTVERTIV HOLDINGS CO
Industrials·Electrical Equipment & Parts
0.33%
of portfolio
Number of shares
7,650,000 sh
Holdings current value
$109.47M
Avg closing price
$13.22
+2225.3%
Last action
Trimmed 6.4%
2025Q4
Current $307.34
57
REXRREXFORD INDL RLTY INCREIT
Real Estate·REIT - Industrial
0.33%
of portfolio
Number of shares
1,825,397 sh
Holdings current value
$108.88M
Avg closing price
$55.08
-32.8%
Last action
Exited
2024Q4
Current $37.01
58
CPNGCOUPANG INC
Consumer Cyclical·Internet Retail
0.31%
of portfolio
Number of shares
6,542,307 sh
Holdings current value
$104.68M
Avg closing price
$17.00
+26.7%
Last action
Trimmed 0.5%
2025Q4
Current $21.55
59
BNBROOKFIELD CORP
Financial Services·Asset Management
0.31%
of portfolio
Number of shares
3,191,224 sh
Holdings current value
$104.00M
Avg closing price
$46.67
-0.2%
Last action
Added 63.0%
2025Q4
Current $46.59
60
TOLTOLL BROTHERS INC
Consumer Cyclical·Residential Construction
0.31%
of portfolio
Number of shares
1,712,675 sh
Holdings current value
$102.81M
Avg closing price
$89.29
+64.3%
Last action
Added 0.6%
2025Q4
Current $146.68
61
DEIDOUGLAS EMMETT INCREIT
Real Estate·REIT - Office
0.31%
of portfolio
Number of shares
8,272,165 sh
Holdings current value
$102.00M
Avg closing price
$23.81
-56.1%
Last action
Trimmed 16.4%
2025Q4
Current $10.45
62
AMZNAMAZON COM INC
Consumer Cyclical·Internet Retail
0.30%
of portfolio
Number of shares
965,850 sh
Holdings current value
$99.76M
Avg closing price
$201.71
+24.2%
Last action
Added 17.9%
2025Q4
Current $250.56
63
TRUTRANSUNION
Financial Services·Financial Data & Stock Exchanges
0.29%
of portfolio
Number of shares
1,580,558 sh
Holdings current value
$98.22M
Avg closing price
$53.76
+45.5%
Last action
Trimmed 0.6%
2025Q4
Current $78.25
64
MELIMERCADOLIBRE INC
Consumer Cyclical·Internet Retail
0.29%
of portfolio
Number of shares
73,530 sh
Holdings current value
$96.92M
Avg closing price
$1029
+80.4%
Last action
Trimmed 0.9%
2025Q4
Current $1856
65
AXNX*AXONICS INC
0.29%
of portfolio
Number of shares
1,773,014 sh
Holdings current value
$96.74M
Avg closing price
$42.18
Last action
Exited
2024Q2
Current —
66
216648402COOPER COS INC
0.28%
of portfolio
Number of shares
252,937 sh
Holdings current value
$94.44M
Avg closing price
$213.74
Last action
Exited
2024Q1
Current —
67
IBPINSTALLED BLDG PRODS INC
Consumer Cyclical·Residential Construction
0.28%
of portfolio
Number of shares
823,210 sh
Holdings current value
$93.87M
Avg closing price
$83.49
+256.5%
Last action
Trimmed 4.1%
2025Q4
Current $297.64
68
BWINBRP GROUP INC
Financial Services·Insurance Brokers
0.28%
of portfolio
Number of shares
3,661,625 sh
Holdings current value
$93.22M
Avg closing price
$18.30
+36.9%
Last action
Added 0.0%
2025Q4
Current $25.04
69
NEOGNEOGEN CORP
Healthcare·Medical Devices
0.28%
of portfolio
Number of shares
5,012,542 sh
Holdings current value
$92.83M
Avg closing price
$23.50
-59.5%
Last action
Trimmed 21.1%
2025Q4
Current $9.51
70
ARGXARGENX SEADR
Healthcare·Biotechnology
0.28%
of portfolio
Number of shares
248,955 sh
Holdings current value
$92.76M
Avg closing price
$243.37
+248.9%
Last action
Trimmed 5.3%
2025Q4
Current $849.04
71
TDGTRANSDIGM GROUP INC
Industrials·Aerospace & Defense
0.28%
of portfolio
Number of shares
125,000 sh
Holdings current value
$92.13M
Avg closing price
$310.31
+307.9%
Last action
Trimmed 3.4%
2025Q4
Current $1266
72
CAKECHEESECAKE FACTORY INC
Consumer Cyclical·Restaurants
0.27%
of portfolio
Number of shares
2,587,115 sh
Holdings current value
$90.68M
Avg closing price
$35.28
+77.7%
Last action
Trimmed 8.8%
2025Q3
Current $62.68
73
IEXIDEX CORP
Industrials·Specialty Industrial Machinery
0.27%
of portfolio
Number of shares
391,026 sh
Holdings current value
$90.34M
Avg closing price
$97.86
+110.4%
Last action
Trimmed 27.4%
2025Q4
Current $205.92
74
FWONKUSDLIBERTY MEDIA CORP DELTRK
0.27%
of portfolio
Number of shares
1,200,000 sh
Holdings current value
$89.80M
Avg closing price
$27.68
Last action
Exited
2023Q3
Current —
75
MRCYMERCURY SYS INC
Industrials·Aerospace & Defense
0.27%
of portfolio
Number of shares
1,734,579 sh
Holdings current value
$88.67M
Avg closing price
$50.22
+67.4%
Last action
Trimmed 20.9%
2025Q4
Current $84.05

Portfolio heatmap

Box size = % of portfolio · color = return since filing
TSLA
10.97% · +93.1%
IT
4.69% · -52.5%
ARCH CAP GROUP LTD
4.34%
CSGP
3.92% · -42.3%
MSCI
3.65% · +1.6%
IDXX
3.54% · +17.8%
FDS
3.36% · -43.9%
MTN
3.25% · -43.0%
IRDM
2.68% · -32.4%
AKX
1.96%
KNSL
1.87% · +20.2%
H
1.73% · +54.3%
CHH
1.61% · +1.7%
MTD
1.54% · -12.4%
GWRE
1.50% · +71.1%
GLPI
1.32% · -8.3%
SCHW
1.20% · +76.2%
TECH
1.20% · -20.2%
TSM
1.20% · +298.3%
RRR
1.13% · +27.7%
VAC
1.13% · -44.4%
WST
1.11% · -21.0%
PRI
1.01% · +58.4%
DAY
0.76% · -4.6%

Sector exposure

Share of dollar value across the latest reported portfolio. Unclassified positions excluded.
  • Consumer Cyclical43 pos$9.22B31.4%
  • Technology70 pos$5.17B17.6%
  • Financial Services33 pos$4.96B16.9%
  • Healthcare55 pos$3.57B12.2%
  • Real Estate31 pos$2.97B10.1%
  • Industrials30 pos$1.74B5.9%
  • Communication Services15 pos$1.30B4.4%
  • Consumer Defensive8 pos$246.7M0.8%
  • Basic Materials5 pos$136.3M0.5%
  • Energy2 pos$29.5M0.1%
(11.9% unclassified, excluded from %)