Mason Investment Advisory Services, Inc. — 13F Holdings & Portfolio

CIK 1635007 · latest 13F-HR filed 2026-08-13

Mason Investment Advisory Services, Inc. manages $2.63B in 13F-reported U.S. long-equity assets across 84 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are VLUE (33.98%), AVUV (13.40%), VSS (11.17%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 9 new positions and exited 4; 53 existing positions rose in reported value and 10 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

AUM

$2.63B

Long-equity book

Holdings

Distinct positions

Period

2026-06-30

Filed 2026-08-13

Q/Q Activity

+9 / −4 / ↑53 / ↓10

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26

VLUE34.0% · -4%AVUV13.4% · -0%VSS11.2% · -0%AVSC9.9% · -1%TGRT9.8% · +0%AVDV9.2% · -0%VBR2.6% · -0%TURF2.1% · +28273%CGDV1.6% · +5%CGXU1.2% · +10%MINT1.1% · -1%CGGR0.7% · +14%AVTM0.4% · -6%DFAT0.3% · +0%VNQI0.3% · +10%SPY0.1% · +0%VUG0.1% · +983%EFV0.1% · +2%FNDF0.1% · 0%XOM0.1% · -0%VTV0.1% · +128%IWF0.1% · +739%DFAC0.1% · 0%CVX0.1% · -4%VGSH0.1% · +3%AOA0.1% · +10%XLE0.1% · +396%AAPL0.1% · -6%EZM0.1% · 0%VTI0.0% · +1%MDY0.0% · -4%SPYM0.0% · 0%VIG0.0% · +0%SPYV0.0% · +0%VDE0.0% · -1%SCZ0.0% · +1%ANET0.0% · 0%IVV0.0% · +0%VXF0.0% · +0%GNR0.0% · -1%VNQ0.0% · +1%VYM0.0% · +13%VTEB0.0% · +1%MSFT0.0% · -5%FMAT0.0% · new GOOG0.0% · 0%VAW0.0% · +0%VV0.0% · 0%ACI0.0% · +1%IJH0.0% · 0%VCIT0.0% · +51%VOO0.0% · -6%GOOGL0.0% · -6%IWD0.0% · -2%COST0.0% · -2%TIP0.0% · +7%BNDX0.0% · new AMZN0.0% · -8%DLN0.0% · 0%ITOT0.0% · 0%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 95%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Mar 27, 2026.

Assets Under Management

$15.67B

Discretionary

$14.60B

Employees

Accounts

1,147

Address

11921 FREEDOM DRIVE
SUITE 1000
RESTON, VA 20190

Phone

(703) 716-6000

Website

WWW.MASONCOMPANIES.COM
www.linkedin.com/company/mason-investment-advisory-services
x.com/MasonInvests

This firm reports 3 disclosure items on its registration.

Name	Title / Status	Ownership	Type
DELANEY, JOHN, MURPHY Control	CHIEF COMPLIANCE OFFICER since Oct 2023	Less than 5%	Individual
GEORGE, SCOTT, STANLEY Control	PRESIDENT since Feb 2014	Less than 5%	Individual
GEORGE, SCOTT, STANLEY Control	CO-CHIEF EXECUTIVE OFFICER since Jan 2024	Less than 5%	Individual
MASON INTERNATIONAL, INC. Control	PARENT CORPORATION since Jul 1982	75% or more	Domestic Entity
MASON, WILLIAM, NOYES Control	CHAIRMAN since Jul 1982	Less than 5%	Individual
SCHREINER, CHRISTOPHER, LEE Control	CO-CHIEF EXECUTIVE OFFICER since Jan 2024	Less than 5%	Individual
GOUIN, GEORGE, MICHAEL	CHIEF OPERATING OFFICER since Mar 2025	Less than 5%	Individual
MASON, WILLIAM, NOYES Control Indirect owner via MASON INTERNATIONAL, INC.	SHAREHOLDER since Jul 1982	75% or more	Individual

Ownership & leadership changes · 6 filings with changes since Mar 27, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Mar 28, 2025 filing

AddedGOUIN, GEORGE, MICHAEL · CHIEF OPERATING OFFICER · Less than 5%
ChangedSCHREINER, CHRISTOPHER, LEE · title CHIEF OPERATING OFFICER / CO-CHIEF EXECUTIVE OFFICER → CO-CHIEF EXECUTIVE OFFICER

Mar 29, 2024 filing

No longer listedMASON INTERNATIONAL, INC. · PARENT CORPORATION · 75% or more · indirect via MASON INVESTMENT ADVISORY SERVICES, INC. · listed since Jul 1982
ChangedMASON INTERNATIONAL, INC. · now a control person

Feb 1, 2024 filing

ChangedGEORGE, SCOTT, STANLEY · title PRESIDENT → CO-CHIEF EXECUTIVE OFFICER / PRESIDENT
ChangedSCHREINER, CHRISTOPHER, LEE · title CHIEF OPERATING OFFICER → CHIEF OPERATING OFFICER / CO-CHIEF EXECUTIVE OFFICER

Oct 23, 2023 filing

No longer listedBIRCHFIELD, JUDITH, LYNN · CHIEF COMPLIANCE OFFICER · Less than 5% · listed since Feb 1997
AddedDELANEY, JOHN, MURPHY · CHIEF COMPLIANCE OFFICER · Less than 5% · control person

Aug 4, 2015 filing

AddedSCHREINER, CHRISTOPHER, LEE · CHIEF OPERATING OFFICER · Less than 5% · control person

May 13, 2014 filing

ChangedGEORGE, SCOTT, STANLEY · title VICE-PRESIDENT → PRESIDENT
ChangedMASON, WILLIAM, NOYES · title PRESIDENT → CHAIRMAN

Mar 27, 2012 filing (earliest on record)

ListedBIRCHFIELD, JUDITH, LYNN · CHIEF COMPLIANCE OFFICER · Less than 5%
ListedGEORGE, SCOTT, STANLEY · VICE-PRESIDENT · Less than 5% · control person
ListedMASON INTERNATIONAL, INC. · PARENT CORPORATION · 75% or more
ListedMASON INTERNATIONAL, INC. · PARENT CORPORATION · 75% or more · indirect via MASON INVESTMENT ADVISORY SERVICES, INC.
ListedMASON, WILLIAM, NOYES · PRESIDENT · Less than 5% · control person
ListedMASON, WILLIAM, NOYES · SHAREHOLDER · 75% or more · indirect via MASON INTERNATIONAL, INC. · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

ISHARES TR$232.9M +35.3%
T ROWE PRICE EXCHANGE-TRADED$55.9M +25060.6%
AMERICAN CENTY ETF TR$39.4M +12.6%
T ROWE PRICE EXCHANGE-TRADED$37.4M +16.9%
AMERICAN CENTY ETF TR$37.2M +16.6%

Show all 53 →

Top Trims

EXXON MOBIL CORP-$548.2K -19.9%
CHEVRON CORPORATION-$486.8K -22.9%
VANGUARD WORLD FD-$164.6K -14.3%
ALBERTSONS COMPANIES INC-$142.1K -19.8%
ISHARES TR-$138.5K -33.2%

Show all 10 →

New Positions

Show all 9 →

Exited Positions

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#	Issuer	Symbol	CUSIP	Value	Δ

Mason Investment Advisory Services, Inc. Holdings (2026-06-30)

#	Issuer	Symbol	CUSIP	Value	Weight	Shares	Type
1	ISHARES TR	VLUE	46432F388	$893.4M	33.98%	4,471,056	SH
2	AMERICAN CENTY ETF TR	AVUV	025072877	$352.3M	13.40%	2,824,089	SH
3	VANGUARD INTL EQUITY INDEX F	VSS	922042718	$293.6M	11.17%	1,902,746	SH
4	AMERICAN CENTY ETF TR	AVSC	025072323	$260.6M	9.91%	3,553,024	SH
5	T ROWE PRICE EXCHANGE-TRADED	TGRT	87283Q842	$258.2M	9.82%	5,646,517	SH
6	AMERICAN CENTY ETF TR	AVDV	025072802	$242.3M	9.22%	2,351,220	SH
7	VANGUARD INDEX FDS	VBR	922908611	$68.6M	2.61%	282,251	SH
8	T ROWE PRICE EXCHANGE-TRADED	TURF	87283Q743	$56.1M	2.14%	1,806,498	SH
9	CAPITAL GROUP DIVIDEND VALUE	CGDV	14020W106	$41.6M	1.58%	844,702	SH
10	CAPITAL GROUP INTL FOCUS EQT	CGXU	14019W109	$30.9M	1.18%	892,693	SH
11	PIMCO ETF TR	MINT	72201R833	$27.8M	1.06%	275,603	SH
12	CAPITAL GROUP GROWTH ETF	CGGR	14020G101	$19.6M	0.74%	414,707	SH
13	AMERICAN CENTY ETF TR	AVTM	02507A606	$10.5M	0.40%	192,119	SH
14	DIMENSIONAL ETF TRUST	DFAT	25434V609	$8.4M	0.32%	120,467	SH
15	VANGUARD INTL EQUITY INDEX F	VNQI	922042676	$7.9M	0.30%	175,711	SH
16	STATE STR SPDR S&P 500 ETF T	SPY	78462F103	$3.9M	0.15%	5,257	SH
17	VANGUARD INDEX FDS	VUG	922908736	$3.9M	0.15%	45,077	SH
18	ISHARES TR	EFV	464288877	$2.6M	0.10%	33,784	SH
19	SCHWAB STRATEGIC TR	FNDF	808524755	$2.4M	0.09%	44,934	SH
20	EXXON MOBIL CORP	XOM	30231G102	$2.2M	0.08%	16,185	SH
21	VANGUARD INDEX FDS	VTV	922908744	$2.1M	0.08%	9,603	SH
22	ISHARES TR	IWF	464287614	$1.8M	0.07%	14,824	SH
23	DIMENSIONAL ETF TRUST	DFAC	25434V708	$1.7M	0.06%	38,485	SH
24	CHEVRON CORPORATION	CVX	166764100	$1.6M	0.06%	9,865	SH
25	VANGUARD SCOTTSDALE FDS	VGSH	92206C102	$1.5M	0.06%	25,923	SH
26	ISHARES TR	AOA	464289859	$1.4M	0.06%	14,855	SH
27	SELECT SECTOR SPDR TR	XLE	81369Y506	$1.4M	0.05%	26,388	SH
28	APPLE INC	AAPL	037833100	$1.3M	0.05%	4,651	SH
29	WISDOMTREE TR	EZM	97717W570	$1.3M	0.05%	17,434	SH
30	VANGUARD INDEX FDS	VTI	922908769	$1.2M	0.05%	3,332	SH
31	STATE STR SPDR S&P MIDCAP 40	MDY	78467Y107	$1.2M	0.05%	1,691	SH
32	SPDR SERIES TRUST	SPYM	78464A854	$1.1M	0.04%	12,988	SH
33	VANGUARD SPECIALIZED FUNDS	VIG	921908844	$1.1M	0.04%	4,468	SH
34	SPDR SERIES TRUST	SPYV	78464A508	$1.0M	0.04%	16,658	SH
35	VANGUARD WORLD FD	VDE	92204A306	$989.0K	0.04%	6,588	SH
36	ISHARES TR	SCZ	464288273	$985.6K	0.04%	11,981	SH
37	ARISTA NETWORKS INC	ANET	040413205	$841.8K	0.03%	4,955	SH
38	ISHARES TR	IVV	464287200	$818.3K	0.03%	1,093	SH
39	VANGUARD INDEX FDS	VXF	922908652	$800.6K	0.03%	3,252	SH
40	SPDR INDEX SHS FDS	GNR	78463X541	$793.3K	0.03%	11,785	SH
41	VANGUARD INDEX FDS	VNQ	922908553	$790.1K	0.03%	8,194	SH
42	VANGUARD WHITEHALL FDS	VYM	921946406	$785.9K	0.03%	4,973	SH
43	VANGUARD MUN BD FDS	VTEB	922907746	$781.4K	0.03%	15,449	SH
44	MICROSOFT CORP	MSFT	594918104	$766.3K	0.03%	2,054	SH
45	FIDELITY COVINGTON TRUST	FMAT	316092881	$657.6K	0.03%	11,239	SH
46	ALPHABET INC	GOOG	02079K107	$655.9K	0.02%	1,856	SH
47	VANGUARD WORLD FD	VAW	92204A801	$642.7K	0.02%	2,809	SH
48	VANGUARD INDEX FDS	VV	922908637	$612.8K	0.02%	1,782	SH
49	ALBERTSONS COMPANIES INC	ACI	013091103	$577.3K	0.02%	42,670	SH
50	ISHARES TR	IJH	464287507	$564.5K	0.02%	7,321	SH

Filing History

Period	Filed	AUM	Holdings	Accession
2026-06-30	2026-08-13	$2.63B	84	0001140361-26-032728
2026-03-31	2026-05-14	$2.17B	79	0001140361-26-021278
2025-12-31	2026-02-12	$2.11B	80	0001140361-26-004973
2025-09-30	2025-11-12	$2.01B	80	0001140361-25-041541

Filer Information

Address

11921 FREEDOM DRIVE
SUITE 1000
RESTON, VA 20190

Phone

(703) 716-6000

Filing Manager

Mason Investment Advisory Services, Inc.

RESTON, VA

Signatory

Jack Delaney

Chief Compliance Officer