SEC 13F Intelligence

Managers / Q3 2025

STONE RUN CAPITAL, LLC

CIK 0001512746 · 551 FIFTH AVENUE - 33RD FLOOR, NEW YORK, NY, 10176 · 646-701-6086

Reported Value
$254M
Q3 2025
Positions
71
Filings on Record
29
2019–present window
Filed
Nov 14, 2025
original filing

Summary

Stone Run Capital, LLC reported $254M in U.S.-listed holdings across 71 positions for Q3 2025.

Its largest position, APH, represents 4.6% of the portfolio.

Compared with Q2 2025, the fund opened 5 new positions and exited 2.

Portfolio Metrics

Turnover
+7.9%
vs prior filed quarter
Top-10 Concentration
+38.3%
share of reported value
Largest Position
+4.6%
Amphenol
New / Exited
5 / 2
positions this quarter

Methodology: turnover is min(value bought, value sold) ÷ average reported value across the two quarters — value-based, so market moves inflate it slightly versus a share-based measure. Concentration and largest position are shares of the filing’s total reported value, options excluded. New/exited counts compare against the prior filed quarter. All figures derive solely from the fund’s 13F filings.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $161MQ4 ’18Q1 ’19: $203MQ2 ’19: $219MQ3 ’19: $210MQ4 ’19: $225MQ4 ’19Q1 ’20: $174MQ2 ’20: $202MQ3 ’20: $219MQ4 ’20: $252MQ4 ’20Q1 ’21: $262MQ2 ’21: $283MQ3 ’21: $292MQ4 ’21: $310MQ4 ’21Q1 ’22: $271MQ2 ’22: $199MQ3 ’22: $186MQ4 ’22: $198MQ4 ’22Q1 ’23: $209MQ2 ’23: $225MQ3 ’23: $204MQ4 ’23: $233MQ4 ’23Q1 ’24: $262MQ2 ’24: $250MQ3 ’24: $269MQ4 ’24: $255MQ4 ’24Q1 ’25: $237MQ2 ’25: $250MQ3 ’25: $254Mfilingsflow.com

Portfolio Composition

By security type
Common Stock: 93.2%Other: 6.7%ADR: 0.1%
  • Common Stock · 93.2% · $237M
  • Other · 6.7% · $17M
  • ADR · 0.1% · $200,999

Quarter-over-Quarter Changes full breakdown →

vs Q2 2025 (amended baseline)

IssuerMoveShare ΔShares nowValue ΔValue now
RALRALLIANT CORPNEW+7.0K7.0K+$306,810$306,810
SRESEMPRANEW+2.5K2.5K+$224,950$224,950
GE AEROSPACENEW+708708+$212,935$212,935
SHELSHELL PLCNEW+2.8K2.8K+$200,999$200,999
DUKDUKE ENERGY CORP NEWNEW+1.6K1.6K+$200,599$200,599
SNPSSYNOPSYS INCADDED+6.2K7.5K+$3M$4M
AKXANSYS INCSOLD OUT−16.0K0−$6M$0
CARRCARRIER GLOBAL CORPORATIONSOLD OUT−3.0K0−$219,570$0

Value changes conflate price moves with buying and selling — share changes are the real signal. Share counts are not split-adjusted.

Holdings — Q3 2025

50 positions
Export to Excel
#IssuerClass% PortfolioValue ↓Shares
1APHAMPHENOL CORP NEWhistory →CL A4.65%$12M95.3K
2HEIHEICO CORP NEWhistory →COM4.51%$11M35.5K
3BRK/BBERKSHIRE HATHAWAY INC DELhistory →CL B NEW4.07%$10M20.6K
4ADSKAUTODESK INChistory →COM3.95%$10M31.5K
5ANETARISTA NETWORKS INChistory →COM SHS3.81%$10M66.4K
6MLMMARTIN MARIETTA MATLS INChistory →COM3.79%$10M15.3K
7WTSWATTS WATER TECHNOLOGIES INChistory →CL A3.52%$9M32.0K
8SPGIS&P GLOBAL INChistory →COM3.46%$9M18.1K
9LINDE PLCSHS3.30%$8M17.6K
10LIILENNOX INTL INChistory →COM3.28%$8M15.7K
11ROPROPER TECHNOLOGIES INChistory →COM3.15%$8M16.0K
12STERIS PLCSHS USD2.76%$7M28.3K
13GLWCORNING INChistory →COM2.74%$7M84.7K
14SHWSHERWIN WILLIAMS COhistory →COM2.52%$6M18.5K
15TMOTHERMO FISHER SCIENTIFIC INChistory →COM2.49%$6M13.0K
16ECLECOLAB INChistory →COM2.34%$6M21.7K
17EMREMERSON ELEC COhistory →COM2.27%$6M43.9K
18WABWABTEChistory →COM2.24%$6M28.3K
19GEVGE VERNOVA INChistory →COM2.17%$6M9.0K
20EWEDWARDS LIFESCIENCES CORPhistory →COM2.16%$5M70.4K
21PAYXPAYCHEX INChistory →COM2.14%$5M42.9K
22XYLXYLEM INChistory →COM2.01%$5M34.5K
23DHRDANAHER CORPORATIONhistory →COM1.98%$5M25.4K
24TRMBTRIMBLE INChistory →COM1.91%$5M59.4K
25LHLABCORP HOLDINGS INChistory →COM SHS1.89%$5M16.7K
26TECHBIO-TECHNE CORPhistory →COM1.71%$4M78.2K
27GOOGLALPHABET INChistory →CAP STK CL A1.66%$4M17.4K
28NDSNNORDSON CORPhistory →COM1.64%$4M18.3K
29ITGARTNER INChistory →COM1.62%$4M15.6K
30BDXBECTON DICKINSON & COhistory →COM1.56%$4M21.1K
31MCXMCCORMICK & CO INChistory →COM NON VTG1.56%$4M59.0K
32SNPSSYNOPSYS INChistory →COM1.46%$4M7.5K
33FISVFISERV INChistory →COM1.45%$4M28.6K
34ENQENTEGRIS INChistory →COM1.45%$4M39.8K
35PKNREVVITY INChistory →COM1.36%$3M39.3K
36TERTERADYNE INChistory →COM1.11%$3M20.4K
37PANWPALO ALTO NETWORKS INChistory →COM1.08%$3M13.5K
38VLTOVERALTO CORPCOM SHS0.87%$2M20.8K
39PTCPTC INCCOM0.74%$2M9.2K
40EPAMEPAM SYS INCCOM0.72%$2M12.1K
41AAPLAPPLE INCCOM0.70%$2M7.0K
42AXGNAXOGEN INCCOM0.66%$2M94.5K
43AOSSMITH A O CORPCOM0.64%$2M22.3K
44BROOKFIELD INFRAST PARTNERSLP INT UNIT0.63%$2M48.9K
45FTNTFORTINET INCCOM0.52%$1M15.7K
46ISRGINTUITIVE SURGICAL INCCOM NEW0.44%$1M2.5K
47ABBVABBVIE INCCOM0.34%$856,6983.7K
48MMM3M COCOM0.26%$650,0494.2K
49RTXRTX CORPORATIONCOM0.24%$597,8703.6K
50ITWILLINOIS TOOL WKS INCCOM0.20%$508,4821.9K

Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q3 2025$254M71Nov 14, 202513F-HRchanges · EDGAR ↗
Q2 2025$250M68Aug 14, 202513F-HRchanges · EDGAR ↗
Q1 2025$237M66May 14, 202513F-HRchanges · EDGAR ↗
Q4 2024$255M68Feb 14, 202513F-HRchanges · EDGAR ↗
Q3 2024$269M70Nov 14, 202413F-HRchanges · EDGAR ↗
Q2 2024$250M65Aug 14, 202413F-HRchanges · EDGAR ↗
Q1 2024$262M66May 14, 202413F-HRchanges · EDGAR ↗
Q4 2023$233M65Feb 14, 202413F-HRchanges · EDGAR ↗
Q3 2023$204M57Nov 14, 202313F-HRchanges · EDGAR ↗
Q2 2023REVEALED$225M57Aug 14, 202313F-HRchanges · EDGAR ↗
Q1 2023$209M57May 15, 202313F-HRchanges · EDGAR ↗
Q4 2022$198M58Feb 14, 202313F-HRchanges · EDGAR ↗
Q3 2022$186M59Nov 14, 202213F-HRchanges · EDGAR ↗
Q2 2022$199M60Aug 15, 202213F-HRchanges · EDGAR ↗
Q1 2022$271M64May 16, 202213F-HRchanges · EDGAR ↗
Q4 2021$310M62Feb 14, 202213F-HRchanges · EDGAR ↗
Q3 2021$292M64Nov 15, 202113F-HRchanges · EDGAR ↗
Q2 2021$283M64Aug 16, 202113F-HRchanges · EDGAR ↗
Q1 2021$262M64May 17, 202113F-HRchanges · EDGAR ↗
Q4 2020$252M60Feb 16, 202113F-HRchanges · EDGAR ↗
Q3 2020$219M61Nov 13, 202013F-HRchanges · EDGAR ↗
Q2 2020$202M57Aug 14, 202013F-HRchanges · EDGAR ↗
Q1 2020$174M59May 15, 202013F-HRchanges · EDGAR ↗
Q4 2019$225M59Feb 14, 202013F-HRchanges · EDGAR ↗
Q3 2019$210M58Nov 14, 201913F-HRchanges · EDGAR ↗
Q2 2019$219M60Aug 14, 201913F-HRchanges · EDGAR ↗
Q1 2019$203M61May 14, 201913F-HRchanges · EDGAR ↗
Q4 2018$161M59Feb 14, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.