Managers / Q1 2026
Mason Investment Advisory Services, Inc.
CIK 0001635007 · 11921 FREEDOM DRIVE, SUITE 1000, RESTON, VA, 20190 · 703-716-6000
Reported Value
$2.2B
Q1 2026
Positions
79
Filings on Record
29
2019–present window
Filed
May 14, 2026
original filing
Summary
Mason Investment Advisory Services, Inc. reported $2.2B in U.S.-listed holdings across 79 positions for Q1 2026.
The portfolio is heavily concentrated: Ishares Tr alone accounts for 30.5% of reported value.
Compared with Q4 2025, the fund opened 3 new positions and exited 4.
Reported Value by Quarter
13F Reported Value
Portfolio Composition
By security type
- ETP · 99.5% · $2.2B
- Common Stock · 0.5% · $12M
- ADR · 0.0% · $203,143
Quarter-over-Quarter Changes full breakdown →
Holdings — Q1 2026
Filing History
| Quarter | Reported Value | Positions | Filed | Type | Links |
|---|---|---|---|---|---|
| Q1 2026 | $2.2B | 79 | May 14, 2026 | 13F-HR | changes · EDGAR ↗ |
| Q4 2025 | $2.1B | 80 | Feb 12, 2026 | 13F-HR | changes · EDGAR ↗ |
| Q3 2025 | $2.0B | 80 | Nov 12, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q2 2025 | $1.8B | 74 | Aug 5, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q1 2025 | $1.7B | 74 | May 1, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q4 2024 | $1.7B | 71 | Feb 6, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q3 2024 | $1.7B | 73 | Nov 12, 2024 | 13F-HR | changes · EDGAR ↗ |
| Q2 2024 | $1.6B | 73 | Aug 9, 2024 | 13F-HR | changes · EDGAR ↗ |
| Q1 2024 | $1.4B | 67 | May 13, 2024 | 13F-HR | changes · EDGAR ↗ |
| Q4 2023 | $1.4B | 64 | Feb 13, 2024 | 13F-HR | changes · EDGAR ↗ |
Other Included Managers
This filing reports holdings on behalf of 2 additional managers.
- Aperio Group, LLC028-11964
- BlackRock, Inc.028-24466
13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.