# EDGAR Filing Document

**Accession Number:** 0001635007
**File Stem:** 0001140361-25-041541
**Filing Date:** 2025-11
**Character Count:** 12159
**Document Hash:** 07c87eea389ee0a1f3d440f45dbe63dd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-25-041541.hdr.sgml**: 20251112

**ACCESSION NUMBER**: 0001140361-25-041541

**CONFORMED SUBMISSION TYPE**: 13F-HR

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251112

**DATE AS OF CHANGE**: 20251112

**EFFECTIVENESS DATE**: 20251112

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Mason Investment Advisory Services, Inc.
- **CENTRAL INDEX KEY:** 0001635007

**ORGANIZATION NAME:**
- **EIN:** 541211118

**FILING VALUES:**
- **FORM TYPE:** 13F-HR
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 028-23779
- **FILM NUMBER:** 251468624

**BUSINESS ADDRESS:**
- **STREET 1:** 11921 FREEDOM DRIVE
- **STREET 2:** SUITE 1000
- **CITY:** RESTON
- **STATE:** VA
- **ZIP:** 20190
- **BUSINESS PHONE:** 703-716-6000

**MAIL ADDRESS:**
- **STREET 1:** 11921 FREEDOM DRIVE
- **STREET 2:** SUITE 1000
- **CITY:** RESTON
- **STATE:** VA
- **ZIP:** 20190

### FORM 13F COVER PAGE

**Report for the Calendar Year or Quarter Ended:** 09-30-2025

**Check here if Amendment** [ ] **Amendment Number:** 

**This Amendment (Check only one.):** [ ] is a restatement.

[ ] adds new holdings entries.

**Institutional Investment Manager Filing this Report:**

**Name:** Mason Investment Advisory Services Inc.<br>**Address:** 11921 Freedom Drive<br>Suite 1000<br>Reston, VA 20190

**Form 13F File Number:** 028-23779

**CRD Number (if applicable):** 000111113

**SEC File Number (if applicable):** 801-18054

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

**Person Signing this Report on Behalf of Reporting Manager:**

**Name:** Jack Delaney<br>**Title:** Chief Compliance Officer<br>**Phone:** 703-716-6000

**Signature, Place, and Date of Signing:**

/s/ Jack Delaney  Reston, VA  11-12-2025<br>[Signature]  [City, State]  [Date]

**Report Type (Check only one.):**

[ ] **13F HOLDINGS REPORT.** (Check here if all holdings of this reporting manager are reported in this report.)

[ ] **13F NOTICE.** (Check here if no holdings are reported in this report, and all holdings are reported by other reporting manager(s).)

[x] **13F COMBINATION REPORT.** (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)

### Form 13F Summary Page

**Report Summary:**

**Number of Other Included Managers:** 0

**Form 13F Information Table Entry Total:** 80

**Form 13F Information Table Value Total:** $2007688524

      (round to nearest dollar)

**List of Other Included Managers:**

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.

[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]

|   No. | Name             | Form 13F File Number   | CRD Number   | SEC File Number   |
|---:|:---|:---|:---|:---|
|     1 | Aperio Group LLC | 028-11964              | 000111616    | 801-57184         |
|     2 | BlackRock Inc.   | 028-24466              |  |  |

### FORM 13F INFORMATION TABLE

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| NAME OF ISSUER | TITLE OF CLASS | CUSIP | FIGI | VALUE (x$1000) | SHRS OR PRN AMT | SH/PRN | PUT/CALL | INVESTMENT DISCRETION | OTHER MANAGER | VOTING AUTHORITY | VOTING AUTHORITY | VOTING AUTHORITY |
| NAME OF ISSUER | TITLE OF CLASS | CUSIP | FIGI | VALUE (x$1000) | SHRS OR PRN AMT | SH/PRN | PUT/CALL | INVESTMENT DISCRETION | OTHER MANAGER | SOLE | SHARED | NONE |
| AIM ETF PRODUCTS TRUST | US LRGCP B10 APR | 00888H406 |  | 295142 | 7685 | SH |  | SOLE |  | 0 | 0 | 7685 |
| ALBERTSONS COS INC | COMMON STOCK | 013091103 |  | 1386574 | 79188 | SH |  | SOLE |  | 0 | 0 | 79188 |
| ALPHABET INC | CAP STK CL A | 02079K305 |  | 529847 | 2180 | SH |  | SOLE |  | 0 | 0 | 2180 |
| ALPHABET INC | CAP STK CL C | 02079K107 |  | 837642 | 3439 | SH |  | SOLE |  | 0 | 0 | 3439 |
| AMAZON COM INC | COM | 023135106 |  | 357460 | 1628 | SH |  | SOLE |  | 0 | 0 | 1628 |
| AMERICAN CENTY ETF TR | INTL SMCP VLU | 025072802 |  | 213297139 | 2395790 | SH |  | SOLE |  | 0 | 0 | 2395790 |
| AMERICAN CENTY ETF TR | AVANTIS US SMALL | 025072323 |  | 201035266 | 3511533 | SH |  | SOLE |  | 0 | 0 | 3511533 |
| AMERICAN CENTY ETF TR | US SML CP VALU | 025072877 |  | 275468835 | 2767697 | SH |  | SOLE |  | 0 | 0 | 2767697 |
| APPLE INC | COM | 037833100 |  | 1588506 | 6238 | SH |  | SOLE |  | 0 | 0 | 6238 |
| ARISTA NETWORKS INC | COM SHS | 040413205 |  | 838270 | 5753 | SH |  | SOLE |  | 0 | 0 | 5753 |
| BERKSHIRE HATHAWAY INC DEL | CL B NEW | 084670702 |  | 245337 | 488 | SH |  | SOLE |  | 0 | 0 | 488 |
| CAPITAL GROUP DIVIDEND VALUE | SHS CREATION UNI | 14020W106 |  | 20023407 | 476407 | SH |  | SOLE |  | 0 | 0 | 476407 |
| CAPITAL GROUP GROWTH ETF | SHS CREATION UNI | 14020G101 |  | 11285814 | 256963 | SH |  | SOLE |  | 0 | 0 | 256963 |
| CAPITAL GROUP INTL FOCUS EQT | SHS CREATION UNI | 14019W109 |  | 18495905 | 624440 | SH |  | SOLE |  | 0 | 0 | 624440 |
| CHEVRON CORP NEW | COM | 166764100 |  | 1708006 | 10999 | SH |  | SOLE |  | 0 | 0 | 10999 |
| COSTCO WHSL CORP NEW | COM | 22160K105 |  | 581145 | 628 | SH |  | SOLE |  | 0 | 0 | 628 |
| DIMENSIONAL ETF TRUST | US TARGETED VLU | 25434V609 |  | 6979865 | 119908 | SH |  | SOLE |  | 0 | 0 | 119908 |
| DIMENSIONAL ETF TRUST | US CORE EQUITY 2 | 25434V708 |  | 1507804 | 39093 | SH |  | SOLE |  | 0 | 0 | 39093 |
| DT MIDSTREAM INC | COMMON STOCK | 23345M107 |  | 465581 | 4118 | SH |  | SOLE |  | 0 | 0 | 4118 |
| DTE ENERGY CO | COM | 233331107 |  | 965684 | 6828 | SH |  | SOLE |  | 0 | 0 | 6828 |
| ELI LILLY  CO | COM | 532457108 |  | 252468 | 331 | SH |  | SOLE |  | 0 | 0 | 331 |
| EXXON MOBIL CORP | COM | 30231G102 |  | 1830915 | 16239 | SH |  | SOLE |  | 0 | 0 | 16239 |
| FIDELITY COVINGTON TRUST | MSCI MATLS INDEX | 316092881 |  | 205226 | 3914 | SH |  | SOLE |  | 0 | 0 | 3914 |
| HOME DEPOT INC | COM | 437076102 |  | 320239 | 790 | SH |  | SOLE |  | 0 | 0 | 790 |
| INGREDION INC | COM | 457187102 |  | 229721 | 1881 | SH |  | SOLE |  | 0 | 0 | 1881 |
| INTUIT | COM | 461202103 |  | 316153 | 463 | SH |  | SOLE |  | 0 | 0 | 463 |
| INVESCO EXCHANGE TRADED FD T | DORSEY WRGT BASC | 46137V704 |  | 203965 | 1926 | SH |  | SOLE |  | 0 | 0 | 1926 |
| ISHARES TR | TIPS BD ETF | 464287176 |  | 2154439 | 19371 | SH |  | SOLE |  | 0 | 0 | 19371 |
| ISHARES TR | CORE 80/20 AGGRE | 464289859 |  | 524969 | 5956 | SH |  | SOLE |  | 0 | 0 | 5956 |
| ISHARES TR | CORE S TTL STK | 464287150 |  | 363158 | 2493 | SH |  | SOLE |  | 0 | 0 | 2493 |
| ISHARES TR | EAFE SML CP ETF | 464288273 |  | 1013628 | 13212 | SH |  | SOLE |  | 0 | 0 | 13212 |
| ISHARES TR | EAFE VALUE ETF | 464288877 |  | 2206939 | 32536 | SH |  | SOLE |  | 0 | 0 | 32536 |
| ISHARES TR | RUSSELL 2000 ETF | 464287655 |  | 283456 | 1171 | SH |  | SOLE |  | 0 | 0 | 1171 |
| ISHARES TR | RUS MID CAP ETF | 464287499 |  | 413735 | 4285 | SH |  | SOLE |  | 0 | 0 | 4285 |
| ISHARES TR | RUS TP200 GR ETF | 464289438 |  | 226582 | 828 | SH |  | SOLE |  | 0 | 0 | 828 |
| ISHARES TR | CORE S MCP ETF | 464287507 |  | 477381 | 7315 | SH |  | SOLE |  | 0 | 0 | 7315 |
| ISHARES TR | MSCI USA VALUE | 46432F388 |  | 588101483 | 4702931 | SH |  | SOLE |  | 0 | 0 | 4702931 |
| ISHARES TR | CORE S ETF | 464287200 |  | 773952 | 1156 | SH |  | SOLE |  | 0 | 0 | 1156 |
| ISHARES TR | CORE S US VLU | 464287663 |  | 261767 | 2619 | SH |  | SOLE |  | 0 | 0 | 2619 |
| ISHARES TR | RUS 1000 GRW ETF | 464287614 |  | 827164 | 1766 | SH |  | SOLE |  | 0 | 0 | 1766 |
| ISHARES TR | RUS 1000 VAL ETF | 464287598 |  | 715062 | 3512 | SH |  | SOLE |  | 0 | 0 | 3512 |
| ISHARES TR | RUS 2000 GRW ETF | 464287648 |  | 591672 | 1849 | SH |  | SOLE |  | 0 | 0 | 1849 |
| MICROSOFT CORP | COM | 594918104 |  | 1303344 | 2516 | SH |  | SOLE |  | 0 | 0 | 2516 |
| PIMCO ETF TR | ENHAN SHRT MA AC | 72201R833 |  | 48968692 | 486331 | SH |  | SOLE |  | 0 | 0 | 486331 |
| S GLOBAL INC | COM | 78409V104 |  | 2600691 | 5343 | SH |  | SOLE |  | 0 | 0 | 5343 |
| SCHWAB STRATEGIC TR | FUNDAMENTAL INTL | 808524755 |  | 1883359 | 43840 | SH |  | SOLE |  | 0 | 0 | 43840 |
| SCHWAB STRATEGIC TR | US TIPS ETF | 808524870 |  | 332753 | 12347 | SH |  | SOLE |  | 0 | 0 | 12347 |
| SCHWAB STRATEGIC TR | US REIT ETF | 808524847 |  | 240821 | 11165 | SH |  | SOLE |  | 0 | 0 | 11165 |
| SELECT SECTOR SPDR TR | ENERGY | 81369Y506 |  | 390827 | 4375 | SH |  | SOLE |  | 0 | 0 | 4375 |
| SPDR INDEX SHS FDS | S INTL SMLCP | 78463X871 |  | 247085 | 6149 | SH |  | SOLE |  | 0 | 0 | 6149 |
| SPDR INDEX SHS FDS | GLB NAT RESRCE | 78463X541 |  | 697159 | 11774 | SH |  | SOLE |  | 0 | 0 | 11774 |
| SPDR S 500 ETF TR | TR UNIT | 78462F103 |  | 3525683 | 5292 | SH |  | SOLE |  | 0 | 0 | 5292 |
| SPDR S MIDCAP 400 ETF TR | UTSER1 S | 78467Y107 |  | 1059331 | 1777 | SH |  | SOLE |  | 0 | 0 | 1777 |
| SPDR SERIES TRUST | PRTFLO S VL | 78464A508 |  | 917582 | 16584 | SH |  | SOLE |  | 0 | 0 | 16584 |
| SPDR SERIES TRUST | PORTFOLIO S | 78464A854 |  | 1017480 | 12988 | SH |  | SOLE |  | 0 | 0 | 12988 |
| T ROWE PRICE ETF INC | GROWTH ETF | 87283Q842 |  | 234800408 | 5380394 | SH |  | SOLE |  | 0 | 0 | 5380394 |
| VANGUARD INDEX FDS | EXTEND MKT ETF | 922908652 |  | 688451 | 3289 | SH |  | SOLE |  | 0 | 0 | 3289 |
| VANGUARD INDEX FDS | REAL ESTATE ETF | 922908553 |  | 756925 | 8280 | SH |  | SOLE |  | 0 | 0 | 8280 |
| VANGUARD INDEX FDS | S 500 ETF SHS | 922908363 |  | 525631 | 858 | SH |  | SOLE |  | 0 | 0 | 858 |
| VANGUARD INDEX FDS | GROWTH ETF | 922908736 |  | 814891 | 1699 | SH |  | SOLE |  | 0 | 0 | 1699 |
| VANGUARD INDEX FDS | TOTAL STK MKT | 922908769 |  | 1078035 | 3285 | SH |  | SOLE |  | 0 | 0 | 3285 |
| VANGUARD INDEX FDS | LARGE CAP ETF | 922908637 |  | 677600 | 2201 | SH |  | SOLE |  | 0 | 0 | 2201 |
| VANGUARD INDEX FDS | SM CP VAL ETF | 922908611 |  | 58748577 | 281484 | SH |  | SOLE |  | 0 | 0 | 281484 |
| VANGUARD INDEX FDS | VALUE ETF | 922908744 |  | 700621 | 3757 | SH |  | SOLE |  | 0 | 0 | 3757 |
| VANGUARD INTL EQUITY INDEX F | FTSE SMCAP ETF | 922042718 |  | 270609528 | 1898348 | SH |  | SOLE |  | 0 | 0 | 1898348 |
| VANGUARD INTL EQUITY INDEX F | GLB EX US ETF | 922042676 |  | 7725708 | 161829 | SH |  | SOLE |  | 0 | 0 | 161829 |
| VANGUARD INTL EQUITY INDEX F | ALLWRLD EX US | 922042775 |  | 216211 | 3029 | SH |  | SOLE |  | 0 | 0 | 3029 |
| VANGUARD MUN BD FDS | TAX EXEMPT BD | 922907746 |  | 668495 | 13351 | SH |  | SOLE |  | 0 | 0 | 13351 |
| VANGUARD SCOTTSDALE FDS | INT-TERM CORP | 92206C870 |  | 373193 | 4437 | SH |  | SOLE |  | 0 | 0 | 4437 |
| VANGUARD SPECIALIZED FUNDS | DIV APP ETF | 921908844 |  | 1025508 | 4752 | SH |  | SOLE |  | 0 | 0 | 4752 |
| VANGUARD TAX-MANAGED FDS | VAN FTSE DEV MKT | 921943858 |  | 306968 | 5123 | SH |  | SOLE |  | 0 | 0 | 5123 |
| VANGUARD WHITEHALL FDS | INTL HIGH ETF | 921946794 |  | 297566 | 3514 | SH |  | SOLE |  | 0 | 0 | 3514 |
| VANGUARD WHITEHALL FDS | HIGH DIV YLD | 921946406 |  | 643133 | 4563 | SH |  | SOLE |  | 0 | 0 | 4563 |
| VANGUARD WORLD FD | ENERGY ETF | 92204A306 |  | 821296 | 6525 | SH |  | SOLE |  | 0 | 0 | 6525 |
| VANGUARD WORLD FD | MATERIALS ETF | 92204A801 |  | 573643 | 2800 | SH |  | SOLE |  | 0 | 0 | 2800 |
| VISA INC | COM CL A | 92826C839 |  | 268575 | 787 | SH |  | SOLE |  | 0 | 0 | 787 |
| WISDOMTREE TR | INTL QULTY DIV | 97717X131 |  | 308993 | 7748 | SH |  | SOLE |  | 0 | 0 | 7748 |
| WISDOMTREE TR | US LARGECAP DIVD | 97717W307 |  | 325330 | 3738 | SH |  | SOLE |  | 0 | 0 | 3738 |
| WISDOMTREE TR | US MIDCAP FUND | 97717W570 |  | 1149056 | 17434 | SH |  | SOLE |  | 0 | 0 | 17434 |
| WORLD GOLD TR | SPDR GLD MINIS | 98149E303 |  | 212072 | 2774 | SH |  | SOLE |  | 0 | 0 | 2774 |

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