Mason Investment Advisory Services, Inc. holds a concentrated book of 79 stocks 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 equity book. Cloning the disclosed picks since 2024 would be +74% (+25.3%/yr). That is a simulation of the disclosed long book, not audited returns.
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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.
The reported book (valued from quarter-end) returned +130.1%, a 55.7-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
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, no cost basis
Other tracked managers holding the same core names as Mason Investment Advisory Services, Inc.
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| MORGAN STANLEY | 78 / 79 | $422.2B |
| UBS Group AG | 78 / 79 | $107.8B |
| ENVESTNET ASSET MANAGEMENT INC | 78 / 79 | $92.3B |
| LPL Financial LLC | 78 / 79 | $86.4B |
| RAYMOND JAMES FINANCIAL INC | 78 / 79 | $82.4B |
| Cetera Investment Advisers | 78 / 79 | $23.1B |
| COMMONWEALTH EQUITY SERVICES, LLC | 78 / 79 | $20.2B |
| OSAIC HOLDINGS, INC. | 78 / 79 | $17.1B |
Ranked by how many of Mason Investment Advisory Services, Inc.'s top 79 disclosed names each fund also holds: a cross-fund conviction signal from the latest 13F of every tracked manager.
Bars show each stock'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 | 0.0% | ▲+0.3% Added · +11 sh | |
| 29 | SPDR Series Trust STATE STREET SPD | $994K | 13.0K | 0.0% | —Held | |
| 30 | Vanguard Specialized Funds DIV APP ETF | $959K | 4.5K | 0.0% | ▲+0.2% Added · +10 sh | |
| 31 | SPDR Series Trust STATE STREET SPD | $941K | 16.6K | 0.0% | ▲+0.1% Added · +21 sh | |
| 32 | Ishares TR EAFE SML CP ETF | $927K | 11.8K | 0.0% | —Held | |
| 33 | SPDR Index SHS FDS STATE STREET SPD | $885K | 11.9K | 0.0% | —Held | |
| 34 | Vanguard Index FDS VALUE ETF | $825K | 4.2K | 0.0% | ▲+13% Added · +499 sh | |
| 35 | Microsoft Corp COM | $799K | 2.2K | 0.0% | ▲+1.2% Added · +26 sh | |
| 36 | Vanguard Mun BD FDS TAX EXEMPT BD | $764K | 15.3K | 0.0% | ▲+13% Added · +2K sh | |
| 37 | Ishares TR RUS 1000 GRW ETF | $753K | 1.8K | 0.0% | —Held | |
| 38 | Vanguard Index FDS REAL ESTATE ETF | $723K | 8.1K | 0.0% | ▼−2.2% Reduced · −182 sh | |
| 39 | Albertsons Cos Inc COMMON STOCK | $719K | 42.2K | 0.0% | ▲+0.8% Added · +352 sh | |
| 40 | Ishares TR CORE S&P500 ETF | $712K | 1.1K | 0.0% | ▼−6.0% Reduced · −70 sh | |
| 41 | Vanguard Index FDS EXTEND MKT ETF | $669K | 3.3K | 0.0% | ▲+0.1% Added · +3 sh | |
| 42 | Vanguard Whitehall FDS HIGH DIV YLD | $649K | 4.4K | 0.0% | ▼−3.9% Reduced · −179 sh | |
| 43 | Vanguard World FD MATERIALS ETF | $632K | 2.8K | 0.0% | ▼−0.1% Reduced · −2 sh | |
| 44 | Arista Networks Inc COM SHS | $608K | 5.0K | 0.0% | ▼−14% Reduced · −798 sh | |
| 45 | Vanguard Index FDS LARGE CAP ETF | $533K | 1.8K | 0.0% | ▼−16% Reduced · −343 sh | |
| 46 | Alphabet Inc CAP STK CL C | $532K | 1.9K | 0.0% | ▼−18% Reduced · −396 sh | |
| 47 | Vanguard Index FDS S&P 500 ETF SHS | $497K | 831 | 0.0% | ▼−2.4% Reduced · −20 sh | |
| 48 | Ishares TR CORE S&P MCP ETF | $494K | 7.3K | 0.0% | ▲~0% Added · +1 sh | |
| 49 | Alphabet Inc CAP STK CL A | $441K | 1.5K | 0.0% | ▼−23% Reduced · −465 sh | |
| 50 | Ishares TR RUS 1000 VAL ETF | $432K | 2.0K | 0.0% | ▼−43% Reduced · −2K sh |
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 14, 2026 | 79 | $2.2B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 12, 2026 | 80 | $2.1B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 12, 2025 | 80 | $2.0B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 5, 2025 | 74 | $1.8B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 1, 2025 | 74 | $1.7B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 6, 2025 | 71 | $1.7B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 12, 2024 | 73 | $1.7B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 9, 2024 | 73 | $1.6B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 13, 2024 | 67 | $1.4B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 13, 2024 | 64 | $1.4B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Aug 8, 2024 | 63 | $1.1B | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 8, 2024 | 63 | $1.2B | 13F-HR |
| Q1 2023 | Mar 31, 2023 | Aug 8, 2024 | 59 | $1.1B | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Aug 7, 2024 | 86 | $983.4M | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Aug 7, 2024 | 88 | $871.1M | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 7, 2024 | 86 | $971.4M | 13F-HR |
| Q1 2022 | Mar 31, 2022 | Aug 7, 2024 | 95 | $1.2B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Aug 6, 2024 | 100 | $1.2B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Aug 6, 2024 | 94 | $968.6M | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 6, 2024 | 94 | $988.8M | 13F-HR |
| Q1 2021 | Mar 31, 2021 | Aug 6, 2024 | 84 | $958.0M | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Aug 5, 2024 | 81 | $833.2M | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Aug 5, 2024 | 75 | $697.3M | 13F-HR |
| Q2 2020 | Jun 30, 2020 | Aug 5, 2024 | 78 | $673.5M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; 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.