MASECO LLP

Registered adviser

CIK

2074052

Location

LONDON, X0

Portfolio Value

Mid $3,549,036,329

Diversification

Highly concentrated

Filing Date

Global Rank

#1,119 / 8,819 ▼ 34 · as of Jun 2026

Top Industry

Internet Content & Information 19.5%

Period ended 30 days ago

Filed Oct 27, 2026 · 3d

6 quarters · since Jun 2025

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type

Registered adviser

Form ADV roster, Oct 1, 2026

Form ADV adviser

CRD 147686

Roster of Oct 1, 2026

Regulatory AUM

$4,957,724,955

Main clients

Individuals and high net worth (99% of AUM)

LEI

213800YSN32VIQS3BE37

Form ADV history

Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.

Rosters	Regulatory AUM	Main clients
Jul 2026 to Oct 2026	$4,957,724,955	Individuals and high net worth (99%)
Jul 2025 to Jun 2026	$3,829,868,260	Individuals and high net worth (99%)
Jul 2024 to Jun 2025	$3,270,804,576	Individuals and high net worth (99%)
Jul 2023 to Jun 2024	$2,677,438,990	Individuals and high net worth (99%)
May 2023 to Jun 2023	$2,421,044,380	Individuals and high net worth (99%)
Jul 2022 to Apr 2023	$2,421,044,380	Individuals and high net worth (99%)

3 earlier changes not shown.

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, the newest measured quarter, never from the firm's own description.

Style

Concentrated

The top 10 positions are 98.5% of the book (60%+)

Turnover

Low turnover

8.0% over the last four quarters (under 30%)

Horizon

Medium horizon

Value-weighted holding period 4.2 quarters (4 to under 12)

Closest benchmark: every 13F filer's combined book, active share 92.1%; sector active share 86.3% against the combined 13F book's sector weights.

Over time 5 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

View clone backtest

Portfolio Concentration

673 tracked positions · as of Sep 30, 2026 · Δ vs Jun 30, 2026

Top Position

57.2%

+1.8 pts

Top 5

97.6%

+1.0 pts

Top 10

98.5%

+0.0 pts

HHI

3,962

Highly concentrated+212

Portfolio Trend

6 quarters · across all stocks

Sector Breakdown

As of Sep 30, 2026

Sector	% Portfolio	Value	Positions
Unclassified	99.1%	$3,518,668,131	166
Financial Services	0.2%	$8,422,043	82
Communication Services	0.2%	$6,252,881	18
Technology	0.2%	$5,533,545	76
Healthcare	0.2%	$5,382,906	48
Industrials	0.0%	$1,502,334	90
Consumer Cyclical	0.0%	$1,375,686	61
Consumer Defensive	0.0%	$1,246,170	29
Basic Materials	0.0%	$284,276	26
Energy	0.0%	$210,547	24
Utilities	0.0%	$117,671	28
Real Estate	0.0%	$40,139	25

Last Quarter's Activity

Export CSV

Sep 30, 2026 vs Jun 30, 2026

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
VGIT	VANGUARD INTERMEDIATE-TERM TREASURY INDEX FUND	+541,202	7,212,436	$408,656,623
DFGP	Dimensional Global Core Plus Fixed Income ETF	+500,209	4,607,933	$239,271,528
DFIC	Dimensional International Core Equity 2 ETF	+368,251	3,759,654	$141,400,586
DFAC	Dimensional U.S. Core Equity 2 ETF	+342,079	2,707,507	$120,348,686
DFAU	Dimensional US Core Equity Market ETF	+278,437	2,322,173	$121,588,978
DFAI	Dimensional International Core Equity Market ETF	+207,592	2,585,703	$107,125,675
—		+169,366	2,208,899	$0
DFSB	Dimensional Global Sustainability Fixed Income ETF	+118,941	2,041,580	$101,160,289
DFGR	Dimensional Global Real Estate ETF	+105,050	1,714,336	$46,372,788
AVDE	Avantis International Equity ETF	+85,258	2,093,625	$188,656,548
DFSD	Dimensional Short-Duration Fixed Income ETF	+66,020	838,377	$38,961,055
STIP	iShares 0-5 Year TIPS Bond ETF	+59,953	860,685	$85,810,294
VGSR	Vert Global Sustainable Real Estate ETF	+49,683	576,703	$6,125,739
DFAE	Dimensional Emerging Core Equity Market ETF	+43,946	1,485,483	$58,394,336
DFEM	Dimensional Emerging Markets Core Equity 2 ETF	+39,434	2,346,527	$93,204,052
DFSI	Dimensional International Sustainability Core 1 ETF	+35,825	1,047,889	$47,333,146
AVUS	Avantis U.S. Equity ETF	+28,100	2,405,761	$308,153,926
BSV	VANGUARD SHORT-TERM BOND INDEX FUND	+21,540	41,514	$3,171,669
IEI	iShares 3-7 Year Treasury Bond ETF	+20,540	25,868	$2,934,465
VEA	Vanguard FTSE Developed Markets ETF	+14,671	51,553	$3,640,157
VGSH	VANGUARD SHORT-TERM TREASURY INDEX FUND	+11,382	466,943	$26,877,239
VTIP	VANGUARD SHORT-TERM INFLATION-PROTECTED SECURITIES INDEX FUND	+8,899	41,201	$2,027,913
DUSB	Dimensional Ultrashort Fixed Income ETF	+8,389	36,808	$1,858,435
VTI	VANGUARD TOTAL STOCK MARKET INDEX FUND	+7,511	24,076	$9,010,202
VXUS	Vanguard Total International Stock ETF	+5,008	20,480	$1,739,980
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
DFUS	Dimensional U.S. Equity Market ETF	−232,786	7,138,795	$592,734,148
DFUV	Dimensional U.S. Marketwide Value ETF	−80,960	1,918,321	$105,507,655
AVSU	Avantis Responsible U.S. Equity ETF	−39,977	1,265,488	$111,375,598
SHV	iShares 0-1 Year Treasury Bond ETF	−37,525	255,334	$28,168,446
DFSU	Dimensional US Sustainability Core 1 ETF	−22,684	2,046,028	$96,511,140
DFSE	Dimensional Emerging Markets Sustainability Core 1 ETF	−17,427	576,712	$27,884,025
AVSE	Avantis Responsible Emerging Markets Equity ETF	−17,340	418,942	$33,142,501
SGOV	iShares 0-3 Month Treasury Bond ETF	−14,679	14,895	$1,499,628
DFIV	Dimensional International Value ETF	−13,625	989,589	$55,278,441
DFAS	Dimensional U.S. Small Cap ETF	−13,305	269,481	$20,863,219
LEMB	iShares J.P. Morgan EM Local Currency Bond ETF	−8,072	81,949	$3,462,345
AVEM	Avantis Emerging Markets Equity ETF	−6,286	1,154,802	$108,574,484
FNDX	Schwab Fundamental U.S. Large Company ETF	−5,760	72,661	$2,286,641
USHY	iShares Broad USD High Yield Corporate Bond ETF	−3,795	64,945	$2,319,835
—		−2,928	31,222	$0
GDX	VanEck Gold Miners ETF	−1,952	23,957	$2,103,424
VYM	VANGUARD HIGH DIVIDEND YIELD INDEX FUND	−1,752	26,227	$4,070,430
PLTR	Palantir Technologies Inc.	−1,639	266	$49,755
DFAT	Dimensional U.S. Targeted Value ETF	−1,597	8,543	$567,596
VYMI	VANGUARD INTERNATIONAL HIGH DIVIDEND YIELD INDEX FUND	−1,229	22,851	$2,310,921
VOO	VANGUARD 500 INDEX FUND	−1,089	36,480	$25,567,372
IVV	iShares Core S&P 500 ETF	−781	14,246	$10,910,299
SCHC	Schwab International Small-Cap Equity ETF	−707	7,182	$357,232
BND	VANGUARD TOTAL BOND MARKET INDEX FUND	−706	427	$29,954
GLDM	World Gold Trust	−646	1,394	$114,558
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
EWU	iShares MSCI United Kingdom ETF	73,578	$3,423,584
MUB	iShares National Muni Bond ETF	3,900	$394,290
KYMR	Kymera Therapeutics, Inc.	3,000	$335,370
SPTI	State Street(R) SPDR(R) Portfolio Intermediate Term Treasury ETF	5,430	$148,130
SCHR	Schwab Intermediate-Term U.S. Treasury ETF	4,791	$113,546
SCHF	Schwab International Equity ETF	2,140	$58,785
HYEM	VanEck Emerging Markets High Yield Bond ETF	3,000	$58,230
TEL	TE Connectivity plc	270	$56,991
AMLP	Alerian MLP ETF	1,070	$55,500
SCHD	Schwab U.S. Dividend Equity ETF	1,527	$49,673
EMLC	VanEck J.P. Morgan EM Local Currency Bond ETF	2,000	$49,660
MLPX	Global X MLP and Energy Infrastructure ETF	450	$31,419
IJH	iShares Core S&P Mid-Cap ETF	419	$30,147
GOVT	iShares U.S. Treasury Bond ETF	1,351	$29,546
ILF	iShares Latin America 40 ETF	695	$23,977
MU	Micron Technology Inc	22	$23,432
MPC	Marathon Petroleum Corp	52	$20,561
INTF	iShares International Equity Factor ETF	488	$20,256
HWM	Howmet Aerospace Inc.	79	$17,868
AMD	Advanced Micro Devices Inc	28	$17,129
STX	Seagate Technology Holdings plc	17	$15,679
XBI	State Street(R) SPDR(R) S&P(R) Biotech ETF	95	$14,979
VLO	Valero Energy Corp	37	$14,341
VTEB	VANGUARD TAX-EXEMPT BOND INDEX FUND	283	$13,402
PM	Philip Morris International Inc.	67	$12,784
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
SCHB	Schwab U.S. Broad Market ETF	5,325	$154,212
JPST	JPMorgan Ultra-Short Income ETF	1,224	$61,897
JMSI	JPMorgan Sustainable Municipal Income ETF	519	$26,178
GBIL	Goldman Sachs ETF Trust	246	$24,639
BNDX	Vanguard Total International Bond ETF	252	$12,204
SPMD	State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF	107	$7,228
EMB	iShares J.P. Morgan USD Emerging Markets Bond ETF	74	$7,136
VSS	VANGUARD FTSE ALL-WORLD EX-US SMALL-CAP INDEX FUND	44	$6,788
IAGG	iShares Core International Aggregate Bond ETF	65	$3,289
SUSC	iShares ESG Aware USD Corporate Bond ETF	105	$2,430
GMUB	Goldman Sachs Municipal Income ETF	43	$2,211
GEMD	Goldman Sachs Access Emerging Markets USD Bond ETF	52	$2,208
GIGB	Goldman Sachs Access Investment Grade Corporate Bond ETF	43	$1,974
IGIB	iShares 5-10 Year Investment Grade Corporate Bond ETF	34	$1,807
FBTC	Fidelity Wise Origin Bitcoin Fund	28	$1,429
IFRA	iShares U.S. Infrastructure ETF	21	$1,323
ESGD	iShares ESG Aware MSCI EAFE ETF	8	$822
FALN	iShares Fallen Angels USD Bond ETF	17	$463
SHYG	iShares 0-5 Year High Yield Corporate Bond ETF	10	$424
IGEB	iShares Investment Grade Systematic Bond ETF	6	$270
GSJY	Goldman Sachs ActiveBeta(R) Japan Equity ETF	4	$209
SPYM	State Street(R) SPDR(R) Portfolio S&P 500(R) ETF	2	$175
ESGU	iShares ESG Aware MSCI USA ETF	1	$163
—		1	$57
HYDB	iShares High Yield Systematic Bond ETF	1	$46
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

673 tracked positions · $3,549,036,329 total · filing declares 673 positions · $3,654,590,086 · as of Sep 30, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Healthcare Industrials Real Estate Technology Utilities

Showing 1–50 of 673 positions by value · page 1 of 14

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
DFUS	Dimensional U.S. Equity Market ETF	Reduced	7,138,795	-232,786	$592,734,148	−1.9%	16.70%
VGIT	VANGUARD INTERMEDIATE-TERM TREASURY INDEX FUND	Added	7,212,436	+541,202	$408,656,623	+3.9%	11.51%
AVUS	Avantis U.S. Equity ETF	Added	2,405,761	+28,100	$308,153,926	+1.2%	8.68%
DFGP	Dimensional Global Core Plus Fixed Income ETF	Added	4,607,933	+500,209	$239,271,528	+7.0%	6.74%
AVDE	Avantis International Equity ETF	Added	2,093,625	+85,258	$188,656,548	+5.3%	5.32%
DFIC	Dimensional International Core Equity 2 ETF	Added	3,759,654	+368,251	$141,400,586	+11.9%	3.98%
DFAU	Dimensional US Core Equity Market ETF	Added	2,322,173	+278,437	$121,588,978	+15.1%	3.43%
DFAC	Dimensional U.S. Core Equity 2 ETF	Added	2,707,507	+342,079	$120,348,686	+14.7%	3.39%
AVSU	Avantis Responsible U.S. Equity ETF	Reduced	1,265,488	-39,977	$111,375,598	−3.6%	3.14%
AVEM	Avantis Emerging Markets Equity ETF	Reduced	1,154,802	-6,286	$108,574,484	−3.1%	3.06%
DFAI	Dimensional International Core Equity Market ETF	Added	2,585,703	+207,592	$107,125,675	+9.2%	3.02%
DFUV	Dimensional U.S. Marketwide Value ETF	Reduced	1,918,321	-80,960	$105,507,655	−4.1%	2.97%
DFSB	Dimensional Global Sustainability Fixed Income ETF	Added	2,041,580	+118,941	$101,160,289	+1.0%	2.85%
DFSU	Dimensional US Sustainability Core 1 ETF	Reduced	2,046,028	-22,684	$96,511,140	+0.0%	2.72%
DFEM	Dimensional Emerging Markets Core Equity 2 ETF	Added	2,346,527	+39,434	$93,204,052	−0.6%	2.63%
STIP	iShares 0-5 Year TIPS Bond ETF	Added	860,685	+59,953	$85,810,294	+4.9%	2.42%
DFAE	Dimensional Emerging Core Equity Market ETF	Added	1,485,483	+43,946	$58,394,336	+0.7%	1.65%
AVSD	Avantis Responsible International Equity ETF	Added	716,505	+4,798	$57,076,788	+0.4%	1.61%
DFIV	Dimensional International Value ETF	Reduced	989,589	-13,625	$55,278,441	+2.0%	1.56%
DFSI	Dimensional International Sustainability Core 1 ETF	Added	1,047,889	+35,825	$47,333,146	+3.7%	1.33%
DFGR	Dimensional Global Real Estate ETF	Added	1,714,336	+105,050	$46,372,788	−0.5%	1.31%
DFSD	Dimensional Short-Duration Fixed Income ETF	Added	838,377	+66,020	$38,961,055	+5.6%	1.10%
AVSE	Avantis Responsible Emerging Markets Equity ETF	Reduced	418,942	-17,340	$33,142,501	−7.2%	0.93%
SHV	iShares 0-1 Year Treasury Bond ETF	Reduced	255,334	-37,525	$28,168,446	−12.8%	0.79%
DFSE	Dimensional Emerging Markets Sustainability Core 1 ETF	Reduced	576,712	-17,427	$27,884,025	−4.0%	0.79%
VGSH	VANGUARD SHORT-TERM TREASURY INDEX FUND	Added	466,943	+11,382	$26,877,239	+1.4%	0.76%
VOO	VANGUARD 500 INDEX FUND	Reduced	36,480	-1,089	$25,567,372	−0.9%	0.72%
DFAS	Dimensional U.S. Small Cap ETF	Reduced	269,481	-13,305	$20,863,219	−10.4%	0.59%
DFAW	Dimensional World Equity ETF	Added	144,995	+1,784	$11,934,538	+0.7%	0.34%
IVV	iShares Core S&P 500 ETF	Reduced	14,246	-781	$10,910,299	−3.1%	0.31%
VTI	VANGUARD TOTAL STOCK MARKET INDEX FUND	Added	24,076	+7,511	$9,010,202	+47.0%	0.25%
SPY	Spdr S&P 500 ETF Trust	Reduced	10,571	-372	$8,061,761	−1.3%	0.23%
VGSR	Vert Global Sustainable Real Estate ETF	Added	576,703	+49,683	$6,125,739	+2.1%	0.17%
GOOG	Alphabet Inc. Communication Services	Added	15,776	+65	$5,375,514	−3.2%	0.15%
JPM	Jpmorgan Chase & Co Financial Services	Added	13,616	+38	$4,504,581	+1.4%	0.13%
VYM	VANGUARD HIGH DIVIDEND YIELD INDEX FUND	Reduced	26,227	-1,752	$4,070,430	−7.9%	0.11%
VEA	Vanguard FTSE Developed Markets ETF	Added	51,553	+14,671	$3,640,157	+38.5%	0.10%
LEMB	iShares J.P. Morgan EM Local Currency Bond ETF	Reduced	81,949	-8,072	$3,462,345	−9.4%	0.10%
EWU	iShares MSCI United Kingdom ETF	NEW	73,578	NEW	$3,423,584	NEW	0.10%
BSV	VANGUARD SHORT-TERM BOND INDEX FUND	Added	41,514	+21,540	$3,171,669	+103.8%	0.09%
IGSB	iShares 1-5 Year Investment Grade Corporate Bond ETF	Added	58,695	+2,420	$3,006,944	+2.0%	0.08%
IEI	iShares 3-7 Year Treasury Bond ETF	Added	25,868	+20,540	$2,934,465	+368.9%	0.08%
VWO	VANGUARD EMERGING MARKETS STOCK INDEX FUND	Added	42,523	+1,205	$2,522,039	+2.3%	0.07%
IEFA	iShares Core MSCI EAFE ETF	Added	25,586	+16	$2,478,771	+0.4%	0.07%
AAPL	Apple Inc. Technology	Added	7,328	+22	$2,440,370	+15.4%	0.07%
USHY	iShares Broad USD High Yield Corporate Bond ETF	Reduced	64,945	-3,795	$2,319,835	−8.8%	0.07%
VYMI	VANGUARD INTERNATIONAL HIGH DIVIDEND YIELD INDEX FUND	Reduced	22,851	-1,229	$2,310,921	−2.3%	0.07%
FNDX	Schwab Fundamental U.S. Large Company ETF	Reduced	72,661	-5,760	$2,286,641	−6.2%	0.06%
GDX	VanEck Gold Miners ETF	Reduced	23,957	-1,952	$2,103,424	+7.6%	0.06%
VTIP	VANGUARD SHORT-TERM INFLATION-PROTECTED SECURITIES INDEX FUND	Added	41,201	+8,899	$2,027,913	+25.0%	0.06%

Showing the top 50 of 673 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.