Q2 2026 13F · SEC CIK 1635007

Mason Investment Advisory Services, Inc.

Institutional asset managerFiled 2026-08-13 for Q2 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $2.6B
Reported positions: 84
Top holdings a year, 3 yrs: +21.2%
Assets under management: $15.7B

Mason Investment Advisory Services, Inc. is an institutional asset manager that reported 84 positions worth $2.6B in its Q2 2026 13F, filed 2026-08-13. Its largest holdings were Ishares Tr (VLUE, 34.0%), American Centy ETF Tr (AVUV, 13.4%), Vanguard Intl Equity Index F (VSS, 11.2%). A portfolio copying its top holdings returned 21.2% a year over the last 3 years, against 18.8% for the S&P 500.

Mason Investment Advisory Services, Inc. holdings largest 50 of 84 positions.

Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

Mason Investment Advisory Services, Inc. 13F holdings
Stock	% of 13F value	Q1 2026	Shares	Share change	Reported value
VLUEIshares Tr	34.0%	30.5%	4,471,056	-3.7%	$893.4M
AVUVAmerican Centy ETF Tr	13.4%	14.5%	2,824,089	-0.3%	$352.3M
VSSVanguard Intl Equity Index F	11.2%	12.8%	1,902,746	-0.1%	$293.6M
AVSCAmerican Centy ETF Tr	9.9%	10.3%	3,553,024	-0.9%	$260.6M
TGRTT. Rowe Price Growth ETF Total	9.8%	10.2%	5,646,517	+0.5%	$258.2M
AVDVAmerican Centy ETF Tr	9.2%	10.9%	2,351,220	-0.4%	$242.3M
VBRVanguard Index Fds	2.6%	2.8%	282,251	-0.3%	$68.6M
TURFT Rowe Price Exchange-Traded	2.1%	—	1,806,498	—	$56.1M
CGDVCapital Group Dividend Value	1.6%	1.6%	844,702	+5.1%	$41.6M
CGXUCapital Group Intl Focus Eqt	1.2%	1.1%	892,693	+10.0%	$30.9M
MINTPimco Enhanced Short Maturity Active Exc	1.1%	1.3%	275,603	-0.9%	$27.8M
CGGRCapital Group Growth ETF	0.7%	0.7%	414,707	+13.6%	$19.6M
AVTMAvantis Total Equity Markets ETF	0.4%	0.4%	192,119	-6.2%	$10.5M
DFATDimensional ETF Trust	0.3%	0.3%	120,467	+0.2%	$8.4M
VNQIVanguard Intl Equity Index F	0.3%	0.3%	175,711	+9.7%	$7.9M
SPYState Str Spdr S&p 500 ETF T	0.1%	0.2%	5,257	+0.1%	$3.9M
VUGVanguard Index Fds	0.1%	0.1%	45,077	+982.8%	$3.9M
EFVIshares Tr	0.1%	0.1%	33,784	+2.2%	$2.6M
FNDFSchwab Strategic Tr	0.1%	0.1%	44,934	+0.0%	$2.4M
XOMExxon Mobil Corp	0.1%	0.1%	16,185	-0.5%	$2.2M
VTVVanguard Index Fds	0.1%	0.0%	9,603	+128.5%	$2.1M
IWFIshares Tr	0.1%	0.0%	14,824	+739.4%	$1.8M
DFACDimensional ETF Trust	0.1%	0.1%	38,485	+0.0%	$1.7M
CVXChevron Corporation	0.1%	0.1%	9,865	-3.8%	$1.6M
VGSHVanguard Scottsdale Fds	0.1%	0.1%	25,923	+2.7%	$1.5M
AOAIshares Tr	0.1%	0.1%	14,855	+10.5%	$1.4M
XLESelect Sector Spdr Tr	0.1%	—	26,388	—	$1.4M
AAPLApple Inc	0.1%	0.1%	4,651	-6.4%	$1.3M
EZMWisdomtree Tr	0.1%	0.1%	17,434	+0.0%	$1.3M
VTIVanguard Index Fds	0.0%	0.0%	3,332	+1.2%	$1.2M
MDYState Str Spdr S&p Midcap 40	0.0%	0.1%	1,691	-3.8%	$1.2M
SPLGSpdr Series Trust	0.0%	0.0%	12,988	+0.0%	$1.1M
VIGVanguard Specialized Funds	0.0%	0.0%	4,468	+0.2%	$1.1M
SPYVState Street Spdr Portfolio S&p 500 Valu	0.0%	0.0%	16,658	+0.1%	$1.0M
VDEVanguard World Fd	0.0%	0.1%	6,588	-1.2%	$989K
SCZIshares Tr	0.0%	0.0%	11,981	+1.4%	$986K
ANETArista Networks Inc	0.0%	0.0%	4,955	+0.0%	$842K
IVVIshares Tr	0.0%	0.0%	1,093	+0.3%	$818K
VXFVanguard Index Fds	0.0%	0.0%	3,252	+0.1%	$801K
GNRSpdr Index Shs Fds	0.0%	0.0%	11,785	-0.6%	$793K
VNQVanguard Index Fds	0.0%	0.0%	8,194	+0.6%	$790K
VYMVanguard Whitehall Fds	0.0%	0.0%	4,973	+13.4%	$786K
VTEBVanguard Mun Bd Fds	0.0%	0.0%	15,449	+0.8%	$781K
MSFTMicrosoft Corp	0.0%	0.0%	2,054	-4.8%	$766K
FMATFidelity Covington Trust	0.0%	—	11,239	—	$658K
GOOGAlphabet Inc	0.0%	0.0%	1,856	+0.0%	$656K
VAWVanguard World Fd	0.0%	0.0%	2,809	+0.2%	$643K
VVVanguard Index Fds	0.0%	0.0%	1,782	+0.0%	$613K
ACIAlbertsons Cos Inc	0.0%	0.0%	42,670	+1.1%	$577K
IJHIshares Tr	0.0%	0.0%	7,321	+0.0%	$564K

What Mason Investment Advisory Services, Inc. bought and sold in Q2 2026, against Q1 2026.

New positions

Q1 2026's filing was too long to tell new positions apart.

Added to

VUG Vanguard Index Fds+982.8% shares
IWF Ishares Tr+739.4% shares
VTV Vanguard Index Fds+128.5% shares
CGGR Capital Group Growth ETF+13.6% shares
VYM Vanguard Whitehall Fds+13.4% shares
AOA Ishares Tr+10.5% shares
CGXU Capital Group Intl Focus Eqt+10.0% shares
VNQI Vanguard Intl Equity Index F+9.7% shares

Reduced

AAPL Apple Inc-6.4% shares
AVTM Avantis Total Equity Markets ETF-6.2% shares

Left the top 50

Share counts compared with the Q1 2026 13F; a split also changes share counts. The latest filing lists more than 50 positions, so a position that left the top 50 may still be held.

How the holdings did against the S&P 500.

1 year: +38.7% /yr; S&P 500 +20.1%
3 years: +21.2% /yr; S&P 500 +18.8%
5 years: —

A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q2 2026	$2.6B	84
Q1 2026	$2.2B	79
Q4 2025	$2.1B	80
Q3 2025	$2.0B	80
Q2 2025	$1.8B	74
Q1 2025	$1.7B	74
Q4 2024	$1.7B	71
Q3 2024	$1.7B	73
Q2 2024	$1.6B	73
Q1 2024	$1.4B	67
Q4 2023	$1.4B	64

Questions about Mason Investment Advisory Services, Inc.'s portfolio

What stocks does Mason Investment Advisory Services, Inc. own?

Mason Investment Advisory Services, Inc.'s latest 13F, for Q2 2026 and filed Aug 13, 2026, lists 84 positions worth $2.6B. The largest are Ishares Tr (VLUE) at 34.0%, American Centy ETF Tr (AVUV) at 13.4%, Vanguard Intl Equity Index F (VSS) at 11.2%, American Centy ETF Tr (AVSC) at 9.9% and T. Rowe Price Growth ETF Total (TGRT) at 9.8%.

What did Mason Investment Advisory Services, Inc. buy last quarter?

In Q2 2026, Mason Investment Advisory Services, Inc. added Vanguard Index Fds (VUG) (+982.8% shares), Ishares Tr (IWF) (+739.4% shares) and Vanguard Index Fds (VTV) (+128.5% shares), compared with its Q1 2026 filing.

What did Mason Investment Advisory Services, Inc. sell last quarter?

In Q2 2026, Mason Investment Advisory Services, Inc. cut from its top 50 Vanguard Index Fds (VOO), cut from its top 50 Alphabet Inc (GOOGL), cut from its top 50 Ishares Tr (IWD), Apple Inc (AAPL) (-6.4% shares) and Avantis Total Equity Markets ETF (AVTM) (-6.2% shares), compared with its Q1 2026 filing.

How has Mason Investment Advisory Services, Inc.'s portfolio performed?

A portfolio copying Mason Investment Advisory Services, Inc.'s 20 largest 13F holdings each quarter, from the day each filing was public, returned +21.2% a year over the last 3 years, against +18.8% for the S&P 500. Over 1 year: +38.7% against +20.1%.

When is Mason Investment Advisory Services, Inc.'s next 13F filing due?

13F filings are due 45 days after each quarter ends. Mason Investment Advisory Services, Inc.'s filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.

How much money does Mason Investment Advisory Services, Inc. manage?

Mason Investment Advisory Services, Inc. reported $15.7B of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $2.6B.