Stone Run Capital, LLC

In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 14, 2025), Stone Run Capital, LLC reported 71 stock positions worth $253.9 million. Its top holding was Amphenol Class A (APH) at 4.6% of the portfolio, followed by Heico (HEI, 4.5%) and Berkshire Hathaway Class B (BRK.B, 4.1%). Compared with Q2 2025, it opened 5 new positions, sold out of 2, added to 13 and reduced 31. The biggest buy was Synopsys (SNPS, shares +500%) and the biggest sale an exit from Ansys (ANSS).

Most Recent 13F
Q3 2025
Location
NEW YORK, NY
CIK
0001512746
Portfolio Value
$253.9M (Q3 2025)
SEC Filing
0001420506-25-003349 ↗ filed Nov 14, 2025

Holdings Value

0$100.0M$200.0M$300.0M Q1 2024: $261.7M Q1 2024 Q2 2024: $250.4M Q2 2024 Q3 2024: $268.6M Q3 2024 Q4 2024: $254.5M Q4 2024 Q1 2025: $237.3M Q1 2025 Q2 2025: $250.1M Q2 2025 Q3 2025: $253.9M $253.9M Q3 2025

Holdings 71 stocks · $253.9M

APH Amphenol Corp. Class A 4.65% 95,320 $11.8M Reduce -2.6%
HEI Heico Corp. 4.51% 35,466 $11.4M Reduce -0.0%
BRK.B Berkshire Hathaway Inc. Class B 4.07% 20,575 $10.3M No change
ADSK Autodesk Inc. 3.95% 31,535 $10.0M Reduce -3.2%
ANET Arista Networks Inc. 3.81% 66,400 $9.7M Reduce -0.3%
MLM Martin Marietta Materials 3.79% 15,263 $9.6M Reduce -3.4%
WTS Watts Water Technologies-A 3.52% 32,000 $8.9M Reduce -3.2%
SPGI S&P Global Inc. 3.46% 18,061 $8.8M Reduce -5.5%
LIN Linde PLC 3.30% 17,645 $8.4M Reduce -0.1%
LII Lennox International Inc. 3.28% 15,715 $8.3M Add +1.4%
ROP Roper Technologies Inc. 3.15% 16,021 $8.0M Reduce -2.7%
STE Steris PLC 2.76% 28,330 $7.0M Add +0.5%
GLW Corning Inc. 2.74% 84,724 $6.9M Reduce -0.1%
SHW The Sherwin-Williams Co. 2.52% 18,490 $6.4M Reduce -0.3%
TMO Thermo Fisher Scientific Inc. 2.49% 13,012 $6.3M Add +13.4%
ECL Ecolab Inc. 2.34% 21,660 $5.9M No change
EMR Emerson Electric Co. 2.27% 43,896 $5.8M Reduce -0.3%
WAB Wabtec Corp. 2.24% 28,335 $5.7M Reduce -3.4%
GEV GE Vernova Inc. 2.17% 8,956 $5.5M Reduce -2.9%
EW Edwards Lifesciences Corp. 2.16% 70,400 $5.5M Reduce -0.1%
PAYX Paychex Inc. 2.14% 42,853 $5.4M Add +0.2%
XYL Xylem Inc. 2.01% 34,545 $5.1M Reduce -0.7%
DHR Danaher Corp. 1.98% 25,388 $5.0M Add +0.1%
TRMB Trimble Inc. 1.91% 59,440 $4.9M Reduce -0.4%
LH Labcorp Holdings Inc. 1.89% 16,705 $4.8M Reduce -7.5%
TECH Bio-Techne Corp. 1.71% 78,195 $4.3M Reduce -0.1%
GOOGL Alphabet Inc. Class A 1.66% 17,350 $4.2M Add +13.0%
NDSN Nordson Corp. 1.64% 18,315 $4.2M Reduce -10.6%
IT Gartner Inc. 1.62% 15,602 $4.1M Reduce -0.3%
BDX Becton Dickinson and Co. 1.56% 21,139 $4.0M Reduce -13.3%
MKC McCormick & Co.-Non VTG SHRS 1.56% 59,050 $4.0M Reduce -1.2%
SNPS Synopsys Inc. 1.46% 7,498 $3.7M Add +499.8%
FISV Fiserv Inc. 1.45% 28,625 $3.7M Reduce -7.7%
ENTG Entegris Inc. 1.45% 39,830 $3.7M Add +20.0%
RVTY Revvity Inc. 1.36% 39,283 $3.4M Reduce -0.4%
TER Teradyne Inc. 1.11% 20,450 $2.8M Reduce -0.7%
PANW Palo Alto Networks Inc. 1.08% 13,500 $2.7M Add +23.6%
VLTO Veralto Corp. 0.87% 20,824 $2.2M Reduce -26.0%
PTC PTC Inc. 0.74% 9,230 $1.9M Add +2.8%
EPAM Epam Systems Inc. 0.72% 12,140 $1.8M Reduce -5.2%
AAPL Apple Inc. 0.70% 6,980 $1.8M No change
AXGN Axogen Inc. 0.66% 94,526 $1.7M Add +2.7%
AOS Smith (a.o.) Corp. 0.64% 22,300 $1.6M Reduce -16.2%
BIP Brookfield Infrastructure Pa 0.63% 48,930 $1.6M Add +0.0%
FTNT Fortinet Inc. 0.52% 15,650 $1.3M Reduce -1.3%
ISRG Intuitive Surgical Inc. 0.44% 2,500 $1.1M No change
ABBV Abbvie Inc. 0.34% 3,700 $857K No change
MMM 3M Co. 0.26% 4,189 $650K No change
RTX RTX Corp. 0.24% 3,573 $598K No change
ITW Illinois Tool Works 0.20% 1,950 $508K No change
ABT Abbott Laboratories 0.17% 3,300 $442K No change
FTV Fortive Corp. 0.16% 8,404 $412K No change
WWD Woodward Inc. 0.15% 1,500 $379K No change
OKE Oneok Inc. 0.13% 4,550 $332K No change
JNJ Johnson & Johnson 0.12% 1,670 $310K No change
RAL Ralliant Corp. 0.12% 7,016 $307K New
CAT Caterpillar Inc. 0.11% 600 $286K No change
MIDD Middleby Corp. 0.11% 2,085 $277K Reduce -87.1%
MCD McDonald's Corp. 0.11% 900 $274K No change
CNI Canadian Natl Railway Co. 0.11% 2,900 $273K No change
BWXT BWX Technologies Inc. 0.10% 1,428 $263K No change
APD Air Products & Chemicals Inc. 0.10% 950 $259K No change
CDW CDW Corp. 0.10% 1,620 $258K Add +22.3%
AMGN Amgen Inc. 0.10% 900 $254K No change
CP Canadian Pacific Kansas City 0.09% 3,060 $228K No change
SRE Sempra 0.09% 2,500 $225K New
BIPC Brookfield Infrastructure-A 0.08% 5,191 $213K No change
GE General Electric filed as GE AEROSPACE 0.08% 708 $213K New
CEG Constellation Energy 0.08% 636 $209K No change
SHEL Shell PLC-ADR 0.08% 2,810 $201K New
DUK Duke Energy Corp. 0.08% 1,621 $201K New

Portfolio Sells Q2 2025 → Q3 2025

ANSS Ansys Inc. Sold out 0.00% −2.25
IT Gartner Inc. Reduce -0.3% 1.62% −0.91
MIDD Middleby Corp. Reduce -87.1% 0.11% −0.82
FISV Fiserv Inc. Reduce -7.7% 1.45% −0.68
ROP Roper Technologies Inc. Reduce -2.7% 3.15% −0.59
SPGI S&P Global Inc. Reduce -5.5% 3.46% −0.57
VLTO Veralto Corp. Reduce -26.0% 0.87% −0.26
MKC McCormick & Co.-Non VTG SHRS Reduce -1.2% 1.56% −0.25
WAB Wabtec Corp. Reduce -3.4% 2.24% −0.22
EPAM Epam Systems Inc. Reduce -5.2% 0.72% −0.18
RVTY Revvity Inc. Reduce -0.4% 1.36% −0.17
FTNT Fortinet Inc. Reduce -1.3% 0.52% −0.15
HEI Heico Corp. Reduce -0.0% 4.51% −0.14
BDX Becton Dickinson and Co. Reduce -13.3% 1.56% −0.12
NDSN Nordson Corp. Reduce -10.6% 1.64% −0.12
CARR Carrier Global Corp. Sold out 0.00% −0.09
ADSK Autodesk Inc. Reduce -3.2% 3.95% −0.09
EMR Emerson Electric Co. Reduce -0.3% 2.27% −0.08
AOS Smith (a.o.) Corp. Reduce -16.2% 0.64% −0.05
EW Edwards Lifesciences Corp. Reduce -0.1% 2.16% −0.05
SHW The Sherwin-Williams Co. Reduce -0.3% 2.52% −0.02
LIN Linde PLC Reduce -0.1% 3.30% −0.01
LH Labcorp Holdings Inc. Reduce -7.5% 1.89% −0.01
TRMB Trimble Inc. Reduce -0.4% 1.91% +0.10
TECH Bio-Techne Corp. Reduce -0.1% 1.71% +0.10
XYL Xylem Inc. Reduce -0.7% 2.01% +0.21
GEV GE Vernova Inc. Reduce -2.9% 2.17% +0.22
WTS Watts Water Technologies-A Reduce -3.2% 3.52% +0.27
MLM Martin Marietta Materials Reduce -3.4% 3.79% +0.32
TER Teradyne Inc. Reduce -0.7% 1.11% +0.37
APH Amphenol Corp. Class A Reduce -2.6% 4.65% +0.78
GLW Corning Inc. Reduce -0.1% 2.74% +0.96
ANET Arista Networks Inc. Reduce -0.3% 3.81% +1.09

Portfolio Buys Q2 2025 → Q3 2025

SNPS Synopsys Inc. Add +499.8% 1.46% +1.20
TMO Thermo Fisher Scientific Inc. Add +13.4% 2.49% +0.63
GOOGL Alphabet Inc. Class A Add +13.0% 1.66% +0.58
ENTG Entegris Inc. Add +20.0% 1.45% +0.38
AXGN Axogen Inc. Add +2.7% 0.66% +0.27
PANW Palo Alto Networks Inc. Add +23.6% 1.08% +0.19
RAL Ralliant Corp. New 0.12% +0.12
PTC PTC Inc. Add +2.8% 0.74% +0.12
SRE Sempra New 0.09% +0.09
GE General Electric New 0.08% +0.08
SHEL Shell PLC-ADR New 0.08% +0.08
DUK Duke Energy Corp. New 0.08% +0.08
STE Steris PLC Add +0.5% 2.76% +0.05
CDW CDW Corp. Add +22.3% 0.10% +0.01
DHR Danaher Corp. Add +0.1% 1.98% −0.02
BIP Brookfield Infrastructure Pa Add +0.0% 0.63% −0.02
LII Lennox International Inc. Add +1.4% 3.28% −0.28
PAYX Paychex Inc. Add +0.2% 2.14% −0.35

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q3 2025 71$253.9MAPH, HEI, BRK.B, ADSK, ANET
Q2 2025 68$250.1MHEI, ADSK, SPGI, BRK.B, APH
Q1 2025 66$237.3MBRK.B, ROP, SPGI, HEI, ADSK
Q4 2024 68$254.5MSPGI, LII, ADSK, BRK.B, HEI
Q3 2024 70$268.6MHEI, SPGI, LII, BRK.B, IT
Q2 2024 65$250.4MHEI, SPGI, ROP, ADSK, LII
Q1 2024 66$261.7MMLM, BRK.B, LIN, IT, ROP