Mason Investment Advisory Services, Inc. holds a concentrated book of 79 reported positions worth $2.2B as of Q1 2026 (disclosed May 14, 2026, a ~44-day 13F lag). This quarter they opened Avantis Total Equity ETF and trimmed Ishares Msci USA Value Facto. Their largest long position is Ishares Msci USA Value Facto at 30% of the reported non-option book. Cloning the disclosed picks since 2024 would be +78% (+25.0%/yr). That is a simulation of the disclosed long book, not audited returns.
The reported book (valued from quarter-end) returned +135.3%, a 56.9-point gap that is the cost of the ~44-day 13F disclosure lag a real follower can't avoid.
Growth of $10,000 cloning Mason Investment Advisory Services, Inc.'s disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~44 days for the latest filing, with no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: concentrated book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
1% mapped to company sectors
+6 sectors below the cut, 1% together
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as Mason Investment Advisory Services, Inc.
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Hoffman, Alan N Investment Management | 7 / 79 | $158.3M |
| Swiss Re Ltd | 14 / 79 | $1.0B |
| United American Securities Inc. (d/b/a UAS Asset Management) | 8 / 79 | $420.5M |
| Emerald Advisors, LLC | 22 / 79 | $661.2M |
| Kearns & Associates LLC | 14 / 79 | $174.0M |
| Vista Capital Partners, Inc. | 33 / 79 | $921.9M |
| Unconventional Investor, LLC | 20 / 79 | $188.5M |
| Carter Financial, LLC | 14 / 79 | $103.3M |
Ranked by the share of each fund's own book sitting in the names it shares with Mason Investment Advisory Services, Inc.: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each position's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Ishares TR MSCI USA VALUE | $660.5M | 4.64M | 30.5% | ▼−1.0% Reduced · −48K sh | |
| 2 | American Centy ETF TR US SML CP VALU | $313.0M | 2.83M | 14.5% | ▼−0.4% Reduced · −12K sh | |
| 3 | Vanguard Intl Equity Index F FTSE SMCAP ETF | $277.8M | 1.91M | 12.8% | ▼−1.7% Reduced · −32K sh | |
| 4 | American Centy ETF TR INTL SMCP VLU | $235.7M | 2.36M | 10.9% | ▼−2.3% Reduced · −56K sh | |
| 5 | American Centy ETF TR AVANTIS US SMALL | $223.4M | 3.59M | 10.3% | ▼−0.6% Reduced · −22K sh | |
| 6 | T Rowe Price ETF Inc GROWTH ETF | $220.8M | 5.62M | 10.2% | ▲+4.2% Added · +225K sh | |
| 7 | Vanguard Index FDS SM CP VAL ETF | $61.5M | 283.0K | 2.8% | ▼−0.8% Reduced · −2K sh | |
| 8 | Capital Group Dividend Value SHS CREATION UNI | $34.2M | 803.4K | 1.6% | ▲+1.8% Added · +14K sh | |
| 9 | Pimco ETF TR ENHAN SHRT MA AC | $28.0M | 278.2K | 1.3% | ▼−7.7% Reduced · −23K sh | |
| 10 | Capital Group Intl Focus Eqt SHS CREATION UNI | $23.9M | 811.7K | 1.1% | ▲+15% Added · +104K sh | |
| 11 | Capital Group Growth ETF SHS CREATION UNI | $14.7M | 365.1K | 0.7% | ▲+28% Added · +81K sh | |
| 12 | American Centy ETF TR AVANTIS TOTAL EQ | $9.6M | 204.8K | 0.4% | ▲New New position | |
| 13 | Dimensional ETF Trust US TARGETED VLU | $7.5M | 120.3K | 0.3% | ▲~0% Added · +30 sh | |
| 14 | Vanguard Intl Equity Index F GLB EX US ETF | $7.1M | 160.1K | 0.3% | ▼−0.1% Reduced · −169 sh | |
| 15 | State STR SPDR S&P 500 ETF T TR UNIT | $3.4M | 5.3K | 0.2% | ▼~0% Reduced · −1 sh | |
| 16 | Exxon Mobil Corp COM | $2.8M | 16.3K | 0.1% | ▼−0.1% Reduced · −10 sh | |
| 17 | Ishares TR EAFE VALUE ETF | $2.5M | 33.1K | 0.1% | —Held | |
| 18 | Schwab Strategic TR FUNDAMENTAL INTL | $2.2M | 44.9K | 0.1% | —Held | |
| 19 | Chevron Corporation COM | $2.1M | 10.3K | 0.1% | ▲+0.1% Added · +11 sh | |
| 20 | Vanguard Index FDS GROWTH ETF | $1.8M | 4.2K | 0.1% | ▲+149% Added · +2K sh | |
| 21 | Dimensional ETF Trust US CORE EQUITY 2 | $1.5M | 38.5K | 0.1% | ▼−1.0% Reduced · −377 sh | |
| 22 | Vanguard Scottsdale FDS SHORT TERM TREAS | $1.5M | 25.2K | 0.1% | ▲+0.6% Added · +152 sh | |
| 23 | Apple Inc COM | $1.3M | 5.0K | 0.1% | ▼−1.3% Reduced · −65 sh | |
| 24 | Ishares TR CORE 80/20 AGGRE | $1.2M | 13.4K | 0.1% | ▲+17% Added · +2K sh | |
| 25 | Wisdomtree TR US MIDCAP FUND | $1.2M | 17.4K | 0.1% | —Held | |
| 26 | Vanguard World FD ENERGY ETF | $1.2M | 6.7K | 0.1% | ▲+2.1% Added · +139 sh | |
| 27 | State STR SPDR S&P Midcap 40 UTSER1 S&PDCRP | $1.1M | 1.8K | 0.1% | —Held | |
| 28 | Vanguard Index FDS TOTAL STK MKT | $1.1M | 3.3K | <0.1% | ▲+0.3% Added · +11 sh | |
| 29 | SPDR Series Trust STATE STREET SPD | $994K | 13.0K | <0.1% | —Held | |
| 30 | Vanguard Specialized Funds DIV APP ETF | $959K | 4.5K | <0.1% | ▲+0.2% Added · +10 sh | |
| 31 | SPDR Series Trust STATE STREET SPD | $941K | 16.6K | <0.1% | ▲+0.1% Added · +21 sh | |
| 32 | Ishares TR EAFE SML CP ETF | $927K | 11.8K | <0.1% | —Held | |
| 33 | SPDR Index SHS FDS STATE STREET SPD | $885K | 11.9K | <0.1% | —Held | |
| 34 | Vanguard Index FDS VALUE ETF | $825K | 4.2K | <0.1% | ▲+13% Added · +499 sh | |
| 35 | Microsoft Corp COM | $799K | 2.2K | <0.1% | ▲+1.2% Added · +26 sh | |
| 36 | Vanguard Mun BD FDS TAX EXEMPT BD | $764K | 15.3K | <0.1% | ▲+13% Added · +2K sh | |
| 37 | Ishares TR RUS 1000 GRW ETF | $753K | 1.8K | <0.1% | —Held | |
| 38 | Vanguard Index FDS REAL ESTATE ETF | $723K | 8.1K | <0.1% | ▼−2.2% Reduced · −182 sh | |
| 39 | Albertsons Cos Inc COMMON STOCK | $719K | 42.2K | <0.1% | ▲+0.8% Added · +352 sh | |
| 40 | Ishares TR CORE S&P500 ETF | $712K | 1.1K | <0.1% | ▼−6.0% Reduced · −70 sh | |
| 41 | Vanguard Index FDS EXTEND MKT ETF | $669K | 3.3K | <0.1% | ▲+0.1% Added · +3 sh | |
| 42 | Vanguard Whitehall FDS HIGH DIV YLD | $649K | 4.4K | <0.1% | ▼−3.9% Reduced · −179 sh | |
| 43 | Vanguard World FD MATERIALS ETF | $632K | 2.8K | <0.1% | ▼−0.1% Reduced · −2 sh | |
| 44 | Arista Networks Inc COM SHS | $608K | 5.0K | <0.1% | ▼−14% Reduced · −798 sh | |
| 45 | Vanguard Index FDS LARGE CAP ETF | $533K | 1.8K | <0.1% | ▼−16% Reduced · −343 sh | |
| 46 | Alphabet Inc CAP STK CL C | $532K | 1.9K | <0.1% | ▼−18% Reduced · −396 sh | |
| 47 | Vanguard Index FDS S&P 500 ETF SHS | $497K | 831 | <0.1% | ▼−2.4% Reduced · −20 sh | |
| 48 | Ishares TR CORE S&P MCP ETF | $494K | 7.3K | <0.1% | ▲~0% Added · +1 sh | |
| 49 | Alphabet Inc CAP STK CL A | $441K | 1.5K | <0.1% | ▼−23% Reduced · −465 sh | |
| 50 | Ishares TR RUS 1000 VAL ETF | $432K | 2.0K | <0.1% | ▼−43% Reduced · −2K sh |
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1635007/holdings"
Use Arkolith to show Mason Investment Advisory Services, Inc.'s latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter. Raw filing totals can include option notional.
| Quarter | As of | Filed | Lag | Positions | Value | Form |
|---|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 14, 2026 | 44d | 79 | $2.2B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 12, 2026 | 43d | 80 | $2.1B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 12, 2025 | 43d | 80 | $2.0B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 5, 2025 | 36d | 74 | $1.8B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 1, 2025 | 31d | 74 | $1.7B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 6, 2025 | 37d | 71 | $1.7B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 12, 2024 | 43d | 73 | $1.7B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 9, 2024 | 40d | 73 | $1.6B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 13, 2024 | 43d | 67 | $1.4B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 13, 2024 | 44d | 64 | $1.4B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Aug 8, 2024 | 313d | 63 | $1.1B | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 8, 2024 | 405d | 63 | $1.2B | 13F-HR |
| Q1 2023 | Mar 31, 2023 | Aug 8, 2024 | 496d | 59 | $1.1B | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Aug 7, 2024 | 585d | 86 | $983.4M | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Aug 7, 2024 | 677d | 88 | $871.1M | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 7, 2024 | 769d | 86 | $971.4M | 13F-HR |
| Q1 2022 | Mar 31, 2022 | Aug 7, 2024 | 860d | 95 | $1.2B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Aug 6, 2024 | 949d | 100 | $1.2B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Aug 6, 2024 | 1041d | 94 | $968.6M | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 6, 2024 | 1133d | 94 | $988.8M | 13F-HR |
| Q1 2021 | Mar 31, 2021 | Aug 6, 2024 | 1224d | 84 | $958.0M | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Aug 5, 2024 | 1313d | 81 | $833.2M | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Aug 5, 2024 | 1405d | 75 | $697.3M | 13F-HR |
| Q2 2020 | Jun 30, 2020 | Aug 5, 2024 | 1497d | 78 | $673.5M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. Book totals and portfolio weights cover reported non-option positions, which can include notes and warrants. Disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.