William Von Mueffling
Cantillon Capital Management
William Von Mueffling (Cantillon Capital Management) discloses a $665M portfolio across 27 US-listed positions in the latest 13F filing (2026Q2, filed Jul 29, 2026). The largest holding is AVGO at 10.6% of the book. The biggest move of the quarter: trimmed the AVGO share count by 95% (position now $71M). Mechanically cloning this 13F returned 13.3%/yr over the past 12.2 years, versus 13.7%/yr for the S&P 500 across that identical 12.2-year window.
Holdings (27) · click any column to sort
| #↑ | Ticker | Issuer | % Port. | This Q | History | Value |
|---|---|---|---|---|---|---|
| 1 | AVGO | 10.6% | $71M | |||
| 2 | GOOGL | 9.2% | $61M | |||
| 3 | TSM | 8.2% | $55M | |||
| 4 | IBKR | 6.8% | $45M | |||
| 5 | AMAT | 5.5% | $36M | |||
| 6 | ADI | 5.3% | $35M | |||
| 7 | SPGI | 4.4% | $29M | |||
| 8 | V | 4.3% | $29M | |||
| 9 | MSFT | 3.9% | $26M | |||
| 10 | CBRE | 3.7% | $24M | |||
| 11 | LYV | 3.1% | $21M | |||
| 12 | BLK | 3.0% | $20M | |||
| 13 | FERG | 2.9% | $19M | |||
| 14 | FAST | 2.7% | $18M | |||
| 15 | ENTG | 2.7% | $18M | |||
| 16 | CP | 2.6% | $17M | |||
| 17 | UBER | 2.6% | $17M | |||
| 18 | A | 2.5% | $17M | |||
| 19 | ICE | 2.5% | $17M | |||
| 20 | ORCL | 2.3% | $15M | |||
| 21 | CME | 2.1% | $14M | |||
| 22 | YUM | 2.0% | $13M | |||
| 23 | TW | 1.6% | $11M | |||
| 24 | SSNC | 1.6% | $11M | |||
| 25 | SPOT | 1.4% | $9M | |||
| 26 | TCOM | 1.3% | $9M | |||
| 27 | MCO | 1.2% | $8M |
- 1AVGOport10.6%val$71MBroadcom Incthis Q -95%·33q
- port9.2%val$61MAlphabet Inc-cl Athis Q -95%·40q
- 3TSMport8.2%val$55MTaiwan Semiconductor-sp Adrthis Q -95%·36q
- 4IBKRport6.8%val$45MInteractive Brokers Gro-cl Athis Q -95%·37q
- 5AMATport5.5%val$36MApplied Materials Incthis Q -97%·26q
- 6ADIport5.3%val$35MAnalog Devices Incthis Q -95%·40q
- 7SPGIport4.4%val$29MS&p Global Incthis Q -95%·40q
- 8Vport4.3%val$29MVisa Inc-class A Sharesthis Q -95%·40q
- 9MSFTport3.9%val$26MMicrosoft Corpthis Q -94%·26q
- 10CBREport3.7%val$24MCbre Group Inc - Athis Q -95%·40q
- 11LYVport3.1%val$21MLive Nation Entertainment INthis Q -95%·13q
- 12BLKport3.0%val$20MBlackrock Incthis Q -95%·7q
- 13FERGport2.9%val$19MFerguson Enterprises Incthis Q -95%·8q
- 14FASTport2.7%val$18MFastenal COthis Q -95%·33q
- 15ENTGport2.7%val$18MEntegris Incthis Q -95%·28q
- 16CPport2.6%val$17MCanadian Pacific Kansas Citythis Q -95%·12q
- 17UBERport2.6%val$17MUber Technologies Incthis Q -95%·9q
- 18Aport2.5%val$17MAgilent Technologies Incthis Q -95%·40q
- 19ICEport2.5%val$17MIntercontinental Exchange INthis Q -95%·40q
- 20ORCLport2.3%val$15MOracle Corpthis Q -92%·10q
- 21CMEport2.1%val$14MCme Group Incthis Q -95%·40q
- 22YUMport2.0%val$13MYum! Brands Incthis Q -95%·10q
- 23TWport1.6%val$11MTradeweb Markets Inc-class Athis Q -95%·13q
- 24SSNCport1.6%val$11MSs&c Technologies Holdingsthis Q -95%·40q
- 25SPOTport1.4%val$9MSpotify Technology S Athis Q -95%·2q
- 26TCOMport1.3%val$9MTrip.com Group Ltd-adrthis Q -95%·9q
- 27MCOport1.2%val$8MMoody's Corpthis Q -95%·31q
2026Q2 moves, by size (38)(expand ↓)
| Ticker | Issuer | Move | % Port. | Δ Shares | Value |
|---|---|---|---|---|---|
| AVGO | Broadcom Inc | TRIM | 10.6% | -95% | $71M |
| GOOGL | Alphabet Inc-cl A | TRIM | 9.2% | -95% | $61M |
| TSM | Taiwan Semiconductor-sp Adr | TRIM | 8.2% | -95% | $55M |
| IBKR | Interactive Brokers Gro-cl A | TRIM | 6.8% | -95% | $45M |
| AMAT | Applied Materials Inc | TRIM | 5.5% | -97% | $36M |
| ADI | Analog Devices Inc | TRIM | 5.3% | -95% | $35M |
| SPGI | S&p Global Inc | TRIM | 4.4% | -95% | $29M |
| V | Visa Inc-class A Shares | TRIM | 4.3% | -95% | $29M |
| MSFT | Microsoft Corp | TRIM | 3.9% | -94% | $26M |
| CBRE | Cbre Group Inc - A | TRIM | 3.7% | -95% | $24M |
| LYV | Live Nation Entertainment IN | TRIM | 3.1% | -95% | $21M |
| ICE | Intercontinental Exchange IN | TRIM | 2.5% | -95% | $17M |
| BLK | Blackrock Inc | TRIM | 3.0% | -95% | $20M |
| FERG | Ferguson Enterprises Inc | TRIM | 2.9% | -95% | $19M |
| CME | Cme Group Inc | TRIM | 2.1% | -95% | $14M |
| FAST | Fastenal CO | TRIM | 2.7% | -95% | $18M |
| ENTG | Entegris Inc | TRIM | 2.7% | -95% | $18M |
| CP | Canadian Pacific Kansas City | TRIM | 2.6% | -95% | $17M |
| UBER | Uber Technologies Inc | TRIM | 2.6% | -95% | $17M |
| A | Agilent Technologies Inc | TRIM | 2.5% | -95% | $17M |
| TMO | Thermo Fisher Scientific Inc | EXIT | 2.5% | -100% | $0 |
| AON | Aon Plc | EXIT | 2.4% | -100% | $0 |
| ORCL | Oracle Corp | TRIM | 2.3% | -92% | $15M |
| EFX | Equifax Inc | EXIT | 2.1% | -100% | $0 |
| YUM | Yum! Brands Inc | TRIM | 2.0% | -95% | $13M |
| IQV | Iqvia Holdings Inc | EXIT | 1.9% | -100% | $0 |
| TW | Tradeweb Markets Inc-class A | TRIM | 1.6% | -95% | $11M |
| AMT | American Tower Corp | EXIT | 1.8% | -100% | $0 |
| SSNC | Ss&c Technologies Holdings | TRIM | 1.6% | -95% | $11M |
| ADBE | Adobe Inc | EXIT | 1.6% | -100% | $0 |
| TCOM | Trip.com Group Ltd-adr | TRIM | 1.3% | -95% | $9M |
| SPOT | Spotify Technology S A | TRIM | 1.4% | -95% | $9M |
| ALC | Alcon AG | EXIT | 1.3% | -100% | $0 |
| MCO | Moody's Corp | TRIM | 1.2% | -95% | $8M |
| FLUT | Flutter Entmt Plc | EXIT | 0.9% | -100% | $0 |
| TME | Tencent Music Entertainm-adr | EXIT | 0.8% | -100% | $0 |
| LPLA | Lpl Financial Holdings Inc | EXIT | 0.6% | -100% | $0 |
| FWONK | Liberty Media Corp-formula-c | EXIT | 0.6% | -100% | $0 |
- TRIMAVGO10.6%Broadcom IncΔ -95%·$71M
- TRIMGOOGL9.2%Alphabet Inc-cl AΔ -95%·$61M
- TRIMTSM8.2%Taiwan Semiconductor-sp AdrΔ -95%·$55M
- TRIMIBKR6.8%Interactive Brokers Gro-cl AΔ -95%·$45M
- TRIMAMAT5.5%Applied Materials IncΔ -97%·$36M
- TRIMADI5.3%Analog Devices IncΔ -95%·$35M
- TRIMSPGI4.4%S&p Global IncΔ -95%·$29M
- TRIMV4.3%Visa Inc-class A SharesΔ -95%·$29M
- TRIMMSFT3.9%Microsoft CorpΔ -94%·$26M
- TRIMCBRE3.7%Cbre Group Inc - AΔ -95%·$24M
- TRIMLYV3.1%Live Nation Entertainment INΔ -95%·$21M
- TRIMICE2.5%Intercontinental Exchange INΔ -95%·$17M
- TRIMBLK3.0%Blackrock IncΔ -95%·$20M
- TRIMFERG2.9%Ferguson Enterprises IncΔ -95%·$19M
- TRIMCME2.1%Cme Group IncΔ -95%·$14M
- TRIMFAST2.7%Fastenal COΔ -95%·$18M
- TRIMENTG2.7%Entegris IncΔ -95%·$18M
- TRIMCP2.6%Canadian Pacific Kansas CityΔ -95%·$17M
- TRIMUBER2.6%Uber Technologies IncΔ -95%·$17M
- TRIMA2.5%Agilent Technologies IncΔ -95%·$17M
- EXITTMO2.5%Thermo Fisher Scientific IncΔ -100%·$0
- EXITAON2.4%Aon PlcΔ -100%·$0
- TRIMORCL2.3%Oracle CorpΔ -92%·$15M
- EXITEFX2.1%Equifax IncΔ -100%·$0
- TRIMYUM2.0%Yum! Brands IncΔ -95%·$13M
- EXITIQV1.9%Iqvia Holdings IncΔ -100%·$0
- TRIMTW1.6%Tradeweb Markets Inc-class AΔ -95%·$11M
- EXITAMT1.8%American Tower CorpΔ -100%·$0
- TRIMSSNC1.6%Ss&c Technologies HoldingsΔ -95%·$11M
- EXITADBE1.6%Adobe IncΔ -100%·$0
- TRIMTCOM1.3%Trip.com Group Ltd-adrΔ -95%·$9M
- TRIMSPOT1.4%Spotify Technology S AΔ -95%·$9M
- EXITALC1.3%Alcon AGΔ -100%·$0
- TRIMMCO1.2%Moody's CorpΔ -95%·$8M
- EXITFLUT0.9%Flutter Entmt PlcΔ -100%·$0
- EXITTME0.8%Tencent Music Entertainm-adrΔ -100%·$0
- EXITLPLA0.6%Lpl Financial Holdings IncΔ -100%·$0
- EXITFWONK0.6%Liberty Media Corp-formula-cΔ -100%·$0
About William Von Mueffling
William Von Mueffling founded Cantillon Capital Management in 2003 after leaving Lazard Asset Management, where he had managed the Lazard International and Global funds. Cantillon runs a concentrated long-only equity strategy — 38 positions and roughly $15B in reported assets as of the most recent 13F — focused on high-quality compounders with durable competitive advantages, a style sometimes described as quality-growth rather than deep value. Current top holdings include AVGO, GOOGL, TSM, IBKR, and SPGI, reflecting a consistent preference for businesses with pricing power and network effects. Because Cantillon is predominantly long-only with limited use of derivatives, its 13F is a reasonably complete picture of the book, though position sizes shift between quarterly disclosures. The latticework backtest suggests roughly market-level returns net of the 45-day lag, which is consistent with a strategy where edge comes from stock selection and long holding periods rather than turnover — the filings are most useful as a window into conviction and thematic rotation rather than as a timing signal.
2026Q2 brief
Cantillon Capital's Q2 2026 13F is a structural anomaly that warrants caution in interpretation: virtually every top holding—AVGO, GOOGL, TSM, IBKR, AMAT, ADI—was trimmed by an almost identical ~95–97% in share count, while six positions (TMO, AON, EFX, IQV, AMT, ADBE) were exited entirely, collapsing the reported portfolio to just $670M from what was almost certainly a far larger prior base. No new positions were initiated. This pattern—uniform ~95% reductions across unrelated sectors with no offsetting buys—strongly implies a large portion of assets shifted to a vehicle not captured in 13F filings (e.g., non-U.S. equities, private structures, or a separately managed sleeve), rather than a fundamental de-risking. The surviving book is tech-heavy with AVGO (10.6%), GOOGL (9.2%), and TSM (8.2%) still leading, flanked by IBKR and semis via AMAT/ADI. Watch the next filing to see whether AUM rebounds—confirming a reporting/structural shift—or whether Cantillon has genuinely compressed its long-equity exposure ahead of a macro call.
AI-generated. Not investment advice.
Filing history
William Von Mueffling's disclosed 13F portfolio value and position count by quarter — the trajectory across every SEC filing.
| Quarter | Positions | Portfolio value |
|---|---|---|
| Q2 2026 — what changed → | 27 | $665M |
| Q1 2026 — what changed → | 38 | $15.05B |
| Q4 2025 — what changed → | 37 | $18.49B |
| Q3 2025 — what changed → | 38 | $18.16B |
| Q2 2025 — what changed → | 38 | $17.30B |
| Q1 2025 — what changed → | 37 | $15.44B |
| Q4 2024 holdings | 36 | $16.55B |
| Q3 2024 holdings | 38 | $16.35B |
| Q2 2024 holdings | 39 | $14.96B |
| Q1 2024 holdings | 37 | $15.90B |
| Q4 2023 holdings | 37 | $14.97B |
| Q3 2023 holdings | 39 | $13.48B |
Values as disclosed at each quarter end. Older filings on EDGAR.
Multibaggers William Von Mueffling held
Stocks up 5x or more since William Von Mueffling first held them at conviction size — the holding record behind the returns. Longest unbroken run and largest book weight are shown for each.
- AMAT30.6xAPPLIED MATERIALS INC25q straight · peak 5.12% · still holds
- TSM27.7xTAIWAN SEMICONDUCTOR-SP ADR35q straight · peak 5.6% · still holds
- AVGO19.5xBROADCOM INC32q straight · peak 10.33% · still holds
- MSFT11.2xMICROSOFT CORP25q straight · peak 4.11% · still holds
- IBKR11.2xINTERACTIVE BROKERS GRO-CL A36q straight · peak 5.01% · still holds
- ENTG11.1xENTEGRIS INC27q straight · peak 2.39% · still holds
Six biggest of 21. Price multiple since the first quarter we observed a conviction holding (2014Q1 at the earliest), not William Von Mueffling's realized return — entry price and trades between filings aren't disclosed. Peak weight is share of disclosed US 13F book. All 129 multibaggers the cohort held →
Frequently asked questions
- What stocks does William Von Mueffling own?
- As of 2026Q2, William Von Mueffling's 13F discloses 27 positions worth $665M. The top five holdings: AVGO (10.6%), GOOGL (9.2%), TSM (8.2%), IBKR (6.8%), AMAT (5.5%). 13F filings cover long US-listed equities only — cash, bonds, shorts, and non-US positions are not disclosed.
- What did William Von Mueffling buy this quarter?
- The 2026Q2 filing shows no new purchases — no new positions were opened and no existing holdings were added to this quarter.
- How big is William Von Mueffling's portfolio?
- $665M across 27 positions per the latest 13F (filed Jul 29, 2026). The top five holdings account for 40% of the disclosed book.
Similar portfolios
Explore more
Long US equity 13F-HR filings only — no shorts, no derivatives. SEC filings at EDGAR (CIK 0001279936). Not investment advice.