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Investor profile

William von Mueffling

Cantillon Capital Management · Founder & CIO · Net worth: ~$500M

Former Lazard star PM who founded Cantillon in 2003. Known for a highly research-driven, long-biased strategy focused on return-on-capital compounders. Low drawdowns, patient capital.

"High-quality businesses at reasonable valuations. Global long."

Data verified 2026-05-07 · sourced from SEC EDGAR

Informational only — not investment advice. HoldLens tracks institutional positioning from public 13F filings. We are not a registered investment advisor and do not provide recommendations to buy or sell securities. Our 2026 backtest over 221 ticker-quarter pairs found the ConvictionScore has no predictive signal for forward returns (Pearson r = −0.12). The rankings describe what tracked superinvestors were accumulating or selling at the latest 13F snapshot — useful as market intelligence, not as personal investment advice. 13F data is reported with a 45-day SEC filing lag.

See the backtest →

Latest 13F: Q1 2026(15d ago)Next due: Q2 2026by 2026-08-14● RSS — move alerts

Tracked positions

Top concentration

46%

Longest holding

Microsoft (since 2012)

William's portfolio concentration: top-1, top-5, top-10

Diversified

Top 1 · BN

8.7%

Top 5 combined

29.9%

Top 10 combined

46.2%

Tracked positions

BNTop-5 zoneTop-10

William's single largest bet is BN at 8.7% of tracked positions. Exposure is spread across a broader basket, reducing single-name risk.

Realized 10-year track record

Cantillon Capital Management (private; mid-teens reported)

See leaderboard →

10y CAGR

10.7%

net of fees

Alpha vs S&P

-2.4%

vs 13.1% benchmark

Win rate

30%

years beating S&P

Quality score

3.8

computed 0–10

Best year

+24%

Worst year

-14%

Cumulative 10y

2.8×

Volatility

11%

William von Mueffling's recent 13F moves: buys, adds, trims, and exits

Manager quality score: 3.8/10

Every tracked 13F move — buys, adds, trims, and exits — over the last two quarters.

Q1 2026

2 buys · 30 sells

Ticker	Activity	Share change	% portfolio
SPOT	Buy (new)	+439K	1.50%
ORCL	Add 49%	+423K	1.30%
AMAT	Reduce 49%	-1.45M	3.60%
FLUT	Reduce 39%	-888K	1.00%
LSXMA	Reduce 39%	-671K	0.60%
TME	Reduce 28%	-5.33M	0.90%
BN	Reduce 12%	-548K	8.70%
GOOGL	Reduce 12%	-500K	7.40%
TSM	Reduce 12%	-336K	5.90%
ADI	Reduce 12%	-257K	4.20%
CBRE	Reduce 12%	-529K	3.70%
V	Reduce 12%	-231K	3.60%
ICE	Reduce 12%	-396K	3.20%
BLK	Reduce 12%	-61K	3.00%
MSFT	Reduce 12%	-150K	2.90%
CRM	Reduce 12%	-187K	2.80%
FERG	Reduce 12%	-236K	2.80%
FAST	Reduce 12%	-1.10M	2.60%
LYV	Reduce 12%	-332K	2.60%
TMO	Reduce 12%	-104K	2.60%

Showing top 20 by position change · 12 smaller moves hidden

Q4 2025

6 buys · 3 sells

Ticker	Activity	Share change	% portfolio
LPLA	Buy (new)	+369K	0.70%
LSXMA	Add 46%	+541K	1.00%
TW	Add 39%	+754K	1.60%
ADBE	Add 16%	+157K	2.30%
ICE	Add 15% Building ICE.	+52K	5.80%
MCO	Add 10% Adding to Moody's.	+32K	6.40%
ZTS	Sell (exit)	-1.21M	0.00%
EBAY	Sell (exit)	-79K	0.00%
MSFT	Reduce 6% Small Microsoft trim.	-48K	7.80%

Q3 2025

6 buys · 3 sells

Ticker	Activity	Share change	% portfolio
LSXMA	Buy (new)	+1.17M	0.70%
TW	Add 71%	+804K	1.20%
IQV	Add 27%	+413K	2.10%
ADBE	Add 17%	+144K	2.00%
SPGI	Add 10% S&P Global add.	+13K	5.50%
MSFT	Add 8% Microsoft add before Q4 trim.	+62K	8.30%
ICON	Sell (exit)	-465K	0.00%
EBAY	Reduce 93%	-1.02M	0.10%
BN	Reduce 14%	-781K	9.00%

Q2 2025

7 buys · 2 sells

Ticker	Activity	Share change	% portfolio
ICON	Buy (new)	+465K	0.40%
ALCON	Add 95%	+1.39M	1.50%
FAST	Add 94%	+4.51M	2.40%
CP	Add 17%	+607K	2.00%
YUM	Add 13%	+239K	1.90%
BLK	Add 10%	+48K	3.30%
ADBE	Add 7%	+60K	2.00%
IQV	Reduce 24%	-491K	1.50%
BN	Reduce 13%	-826K	9.20%

William's sector breakdown

How the top 10 positions are diversified across 3 sectors. Weighted by stated portfolio percentage.

Technology

3 positions · GOOGL, TSM, MSFT

35.1%

16.2% of AUM

Financials

3 positions · BN, V, ICE

33.5%

15.5% of AUM

Other

4 positions · ADI, CBRE, AMAT, BLK

31.4%

14.5% of AUM

Position intelligence · 13F-derived

How Mueffling is sized + moving

Every position classified by both portfolio weight (size bucket) and recent move activity (trend bucket). A 22% Apple position building +5% this quarter signals different intent than a 1% starter trimmed in half. Descriptive analysis of 13F filings — not recommendation.

Core

≥10% positions

Significant

3–10%

Starter

1–3%

Small

<1%

Building

Steady

Trimming

New

Exit pending

Position	% portfolio	Size	Trend
BN BROADCOM INC	8.7%	significant	↓ trimming
GOOGL ALPHABET INC	7.4%	significant	↓ trimming
TSM TAIWAN SEMICONDUCTOR MANUFAC	5.9%	significant	↓ trimming
ADI ANALOG DEVICES INC	4.2%	significant	↓ trimming
CBRE CBRE GROUP INC	3.7%	significant	↓ trimming
AMAT APPLIED MATLS INC	3.6%	significant	↓ trimming
V VISA INC	3.6%	significant	↓ trimming
ICE INTERCONTINENTAL EXCHANGE IN	3.2%	significant	→ steady
BLK BLACKROCK INC	3.0%	significant	→ steady
MSFT MICROSOFT CORP	2.9%	starter	↓ trimming
CRM CME GROUP INC	2.8%	starter	↓ trimming
FERG FERGUSON ENTERPRISES INC	2.8%	starter	↑ building
FAST FASTENAL CO	2.6%	starter	↑ building
LYV LIVE NATION ENTERTAINMENT IN	2.6%	starter	↓ trimming
TMO THERMO FISHER SCIENTIFIC INC	2.6%	starter	→ steady
Showing top 15 of 35 positions.

How to read: Size bucket from current 13F-filed portfolio weight. Trend bucket from the last 2 quarters of move activity (net delta >5% in either direction = building/trimming; new = first-appearance this quarter; exit pending = trimmed >50% last quarter). Data lag: SEC 13F filings are reported 45 days after quarter-end. This is descriptive intelligence — not investment advice.

Score explainability · 9-factor breakdown

What drives the ConvictionScore on Mueffling's top positions

The HoldLens ConvictionScore combines 9 factors. This table shows the per-position breakdown — exactly which factors contribute and by how much for each of Mueffling's top 8 holdings. Hover any header for factor definition. Empty cells (·) = neutral (no contribution).

Ticker	% port	Smart $	Insider	Track	Streak	Conc	Contra	Event	Dissent	Crowd
BN	8.7	+21	·	-4	+10	+7	·	·	+21	·
GOOGL	7.4	+21	-2	-2	+1	+4	·	·	+48	+2
TSM	5.9	+17	+1	·	+10	+5	·	·	+35	·
ADI	4.2	+1	·	-6	·	·	·	·	+6	·
CBRE	3.7	+2	·	-6	·	·	·	·	+11	·
AMAT	3.6	+4	·	-6	·	+1	·	·	+4	·
V	3.6	+18	-4	+4	+5	+10	·	·	+43	+3
ICE	3.2	+6	·	-6	+1	+3	·	·	+5	·

Factor definitions →

Smart $: Manager quality × consensus (0–30)
Insider: Form 4 net buy/sell (-15..+20)
Track: Buyer 10y CAGR × concentration (-10..+20)
Streak: Multi-quarter compounding (0–10)
Conc: Biggest position size as conviction (0–10)
Contra: Under-the-radar bonus (0–10)
Event: 8-K events last 90d (-15..+5)
Dissent: Sells subtract, weighted ×1.6 (0–60)
Crowd: Too many owners = priced in (0–10)

Factors are summed (positive add, penalties subtract), then clamped to the -100/+100 range. Each factor has a maximum contribution shown in parentheses next to its name. Read positive cells as bullish contributions, negative as bearish. See /learn/conviction-score-explained for the full methodology. ConvictionScore is descriptive synthesis of public filings — not investment advice.

Cross-portfolio overlap

Who else holds what Mueffling holds

Top 6 highest-conviction overlap pairs containing William von Mueffling. Each page is the full intersection of two 13F-filed portfolios.

See all 435 overlap pairs →

William von Mueffling's top 10 disclosed holdings (Q1 2026)

Ticker	Company	% Portfolio	Shares (M)
BN	BROADCOM INC	8.7%	4.06
GOOGL	ALPHABET INC	7.4%	3.72
TSM	TAIWAN SEMICONDUCTOR MANUFAC	5.9%	2.49
ADI	ANALOG DEVICES INC	4.2%	1.91
CBRE	CBRE GROUP INC	3.7%	3.93
AMAT	APPLIED MATLS INC	3.6%	1.52
V	VISA INC Payment network.	3.6%	1.72
ICE	INTERCONTINENTAL EXCHANGE IN Exchange + data compounder.	3.2%	2.94
BLK	BLACKROCK INC	3.0%	0.45
MSFT	MICROSOFT CORP Core compounder.	2.9%	1.11

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Dividend tax by country

Estimate your withholding on cross-border dividends

Your country of residenceCompany is domiciled inGross dividend (example)

Withholding rate

Domestic (no cross-border)

Tax withheld

$0.00

You'd receive

$1000.00

Of $1000 gross

Source & treaty reference

Treaty: Domestic — no cross-border withholding

Citation: IRC §§ 1441–1446 (withholding applies to foreign persons; US residents not subject to WHT on US-source dividends)

U.S. residents receiving U.S.-source dividends: no cross-border withholding; taxed on return at qualified (0/15/20%) or ordinary rates.

Estimates for educational purposes only. Tax rules change; consult a qualified tax professional for your specific situation. Dividend-tax treatment depends on holding period, account type (taxable vs. retirement), investor type (individual vs. pension vs. mutual fund), limitation-on-benefits tests, and other factors not modeled here.

Full dividend-tax rules for United States investors →

Want William move-alerts?

One email per 13F filing. Summarizes every new position, exit, and trim.

Investors with portfolios similar to William von Mueffling

Tracked managers whose top positions overlap with William's portfolio.

Chris Hohn

TCI Fund Management

3 shared positions: MSFT, V, MCO

François Rochon

Giverny Capital

3 shared positions: V, CSU.TO, MCO

Glenn Greenberg

Brave Warrior Advisors

2 shared positions: MCO, V

See all 29 investors ranked by portfolio similarity →

ETF replication

Which ETF replicates William's portfolio?

Closest match: XLK · overlap score 110.8 across 1 shared top-10 names. Full ranked list of 5 ETFs →

Investing style

William is a value investor

See 8 other value managers tracked. Patient capital. Concentrated portfolios. Long average holding period.

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Per-quarter digests

What William von Mueffling did, quarter by quarter

Full move-by-move breakdown for each of the last 8 filed quarters.

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024

Frequently asked questions

Who is William von Mueffling?

William von Mueffling runs Cantillon Capital Management as founder & cio. Former Lazard star PM who founded Cantillon in 2003. Known for a highly research-driven, long-biased strategy focused on return-on-capital compounders. Low drawdowns, patient capital.

What fund does William von Mueffling run?

William von Mueffling is founder & cio of Cantillon Capital Management. Cantillon Capital Management files SEC Form 13F-HR quarterly with the latest disclosure dated 2026-05-07 (Q1 2026). Full holdings, share counts, dollar values, and quarter-over-quarter changes are listed below.

What does William von Mueffling invest in?

William von Mueffling's Cantillon Capital Management portfolio is disclosed quarterly via SEC Form 13F-HR. Each position below shows the ticker, share count, dollar value, percentage of portfolio, and quarter-over-quarter change. Data is sourced directly from SEC filings (public-domain regulatory disclosure).

What is William von Mueffling's investment philosophy?

William von Mueffling's stated investment philosophy: "High-quality businesses at reasonable valuations. Global long.". William von Mueffling has been founder & cio of Cantillon Capital Management; estimated net worth ~$500M.

What is William von Mueffling's net worth?

William von Mueffling's estimated net worth is ~$500M. William von Mueffling runs Cantillon Capital Management as founder & cio; full 13F holdings disclosed quarterly with the SEC are listed below.

Data sourced from Cantillon Capital Management 13F filings with the SEC. Approximate snapshot. Not investment advice.

Sister property: SecFilingDex — the encyclopedic reference for Form 13F (HR / NT / HR/A variants) and the regulatory citation behind every position shown above.