Mason Investment Advisory Services, Inc.
Long book
$2.17B
Q1 2026
Positions
79
Top-10 weight
96%
concentration
Last quarter
+18.8%
SPY +14.8%
Turnover
8%
of book per quarter
Strategy in plain words
auto-generated from filingsMason Investment Advisory Services, Inc. is a wealth-management firm allocating client money, running a $2.17B US long book across 79 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. The book barely moves quarter to quarter — a patient, low-turnover holder. Current anchor positions: ISHARES MSCI USA VALUE FACTO, AVANTIS US SMALL CAP VALUE, VANGUARD FTSE ALL WO X-US SC, AVANTIS INTL S/C VALUE ETF, AVANTIS US SMALL CAP EQUITY.
Over the last 9 quarters its long book ran on average 0.7pp per quarter ahead of the S&P 500, beating the index in 6 of 9 quarters. Its holdings are mechanical (indexing / client flows), so position changes carry no stock-picking signal.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-2.3%
Q2 2024
+6.6%
Q3 2024
-1.3%
Q4 2024
-2.7%
Q1 2025
+10.0%
Q2 2025
+9.5%
Q3 2025
+5.2%
Q4 2025
+2.9%
Q1 2026
+18.8%
Sector allocation
Energy 42%
Technology 34%
Consumer discretionary 15%
Healthcare 3%
Services media 2%
Consumer staples 2%
Financials 2%
Long book by quarter
What does Mason Investment own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| XOM EXXON MOBIL CORP | Energy | 16.3K | $2.8M | 0.1% | -0.1% |
| CVX CHEVRON CORP | Energy | 10.3K | $2.1M | 0.1% | +0.1% |
| AAPL APPLE INC | Technology | 5.0K | $1.3M | 0.1% | -1.3% |
| MSFT MICROSOFT CORP | Technology | 2.2K | $799K | 0.0% | +1.2% |
| ACI ALBERTSONS COS INC - CLASS A | Consumer discretionary | 42.2K | $719K | 0.0% | +0.8% |
| ANET ARISTA NETWORKS INC | Technology | 5.0K | $608K | 0.0% | -13.9% |
| GOOG ALPHABET INC-CL C | Technology | 1.9K | $532K | 0.0% | -17.6% |
| GOOGL ALPHABET INC-CL A | Technology | 1.5K | $441K | 0.0% | -23.3% |
| COST COSTCO WHOLESALE CORP | Consumer discretionary | 427 | $426K | 0.0% | Held |
| AMZN AMAZON.COM INC | Consumer discretionary | 1.7K | $348K | 0.0% | +2.6% |
| HD HOME DEPOT INC | Consumer discretionary | 819 | $269K | 0.0% | +3.7% |
| LLY ELI LILLY & CO | Healthcare | 285 | $262K | 0.0% | +5.6% |
| V VISA INC-CLASS A SHARES | Services media | 792 | $239K | 0.0% | +0.6% |
| INGR INGREDION INC | Consumer staples | 2.1K | $231K | 0.0% | +8.6% |
| BRK/B BERKSHIRE HATHAWAY INC-CL B | Financials | 481 | $230K | 0.0% | -1.4% |
| INTU INTUIT INC | Technology | 503 | $217K | 0.0% | +8.6% |
| PGEN PRECIGEN INC | Healthcare | 10.0K | $39K | 0.0% | Held |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 14, 2026 | 79 | $2.17B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 12, 2026 | 80 | $2.11B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 12, 2025 | 80 | $2.01B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 5, 2025 | 74 | $1.83B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 1, 2025 | 74 | $1.66B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 6, 2025 | 71 | $1.71B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 12, 2024 | 73 | $1.71B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 9, 2024 | 73 | $1.62B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 13, 2024 | 67 | $1.45B | canonical | SEC ↗ |