# Mason Street Advisors, LLC

> Mason Street Advisors, LLC is an SEC-registered investment advisory firm in Milwaukee, WI, registered since 2001, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated March 31, 2026.

- CRD: 114085
- Filed as: MASON STREET ADVISORS, LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Milwaukee, WI
- Filing period: October 2026
- Form ADV filing dated: March 31, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/114085
- AdvisorCensus page: https://advisorcensus.com/firm/mason-street-advisors-llc-milwaukee-wi-114085

## Quick answers

**How is Mason Street Advisors, LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Mason Street Advisors, LLC reports these compensation arrangements: a percentage of assets under its management; other. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Mason Street Advisors, LLC located?**
Mason Street Advisors, LLC's principal office is in Milwaukee, WI, according to its Form ADV.

**Is Mason Street Advisors, LLC registered with the SEC or a state?**
Mason Street Advisors, LLC is an SEC-registered investment advisory firm, registered since 2001. Status as filed: Approved. CRD 114085.

**How much does Mason Street Advisors, LLC manage?**
Mason Street Advisors, LLC reports $39,079,170,300 in regulatory assets under management in its Form ADV filing dated March 31, 2026 (100% discretionary).

**How have Mason Street Advisors, LLC's assets and staff changed since 2021?**
In the Form ADV data for Mason Street Advisors, LLC: Regulatory assets under management: $28,813,000,000 in the October 2021 data and $39,079,170,300 in the October 2026 data, up 36%. Total employees: 6 in October 2021 and 13 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Mason Street Advisors, LLC serve?**
By number of clients on Form ADV Item 5.D: investment companies (2).

**Does Mason Street Advisors, LLC report any disciplinary disclosures?**
Reports 5 disclosure items on Form ADV Item 11: yes answers to 11.C(2) (SEC or CFTC finding of a violation), 11.C(4) (SEC or CFTC order), 11.C(5) (SEC or CFTC civil money penalty or cease-and-desist order), 11.D(2) (another regulator's finding of a violation), and 11.D(4) (another regulator's order in the past ten years). Each question covers the firm and its advisory affiliates, and one event can produce several yes answers. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/114085

**What changed in Mason Street Advisors, LLC's recent Form ADV filings?**
In the April 2026 filing data: Regulatory assets under management went from $35,039,451,532 to $39,079,170,300 (+12%). Updated its list of owners and control persons (Schedule A).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Other

### Regulatory assets under management (Item 5.F)
- Total: $39,079,170,300
- Discretionary: $39,079,170,300
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 0 | Not reported |
| High net worth individuals | 0 | Not reported |
| Banking or thrift institutions | 0 | Not reported |
| Investment companies | 2 | $39,079,170,300 |
| Business development companies | 0 | Not reported |
| Pooled investment vehicles (other than investment companies and business development companies) | 0 | Not reported |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 0 | Not reported |
| Charitable organizations | 0 | Not reported |
| State or municipal government entities (including government pension plans) | 0 | Not reported |
| Other investment advisers | 0 | Not reported |
| Insurance companies | 0 | Not reported |
| Sovereign wealth funds and foreign official institutions | 0 | Not reported |
| Corporations or other businesses not listed above | 0 | Not reported |
| Other | 0 | Not reported |

### Advisory services (Item 5.G)
- Portfolio management for investment companies (and business development companies)
- Selection of other advisers (including private fund managers)

### Firm details
- Registered since: 2001 (24 years)
- Employees: 13 total, 13 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: MN, WI
- Disclosures (Item 11): Reports 5 disclosure items on Form ADV Item 11.

### Item 11 questions answered yes
- 11.C(2): Has the SEC or the CFTC ever found that the firm or an advisory affiliate was involved in a violation of SEC or CFTC regulations or statutes?
- 11.C(4): Has the SEC or the CFTC ever entered an order against the firm or an advisory affiliate in connection with investment-related activity?
- 11.C(5): Has the SEC or the CFTC ever imposed a civil money penalty on the firm or an advisory affiliate, or ordered the firm or an advisory affiliate to cease and desist from an activity?
- 11.D(2): Has another federal regulator, a state regulator, or a foreign financial regulator ever found that the firm or an advisory affiliate was involved in a violation of investment-related regulations or statutes?
- 11.D(4): In the past ten years, has another federal regulator, a state regulator, or a foreign financial regulator entered an order against the firm or an advisory affiliate in connection with investment-related activity?

Each question covers the firm and its advisory affiliates: its current employees other than clerical staff, its officers, partners, and directors, and anyone who controls the firm or is controlled by it. One event can produce yes answers to several questions. SEC-registered advisers and exempt reporting advisers may leave out events more than ten years old, and may answer 11.A(2) and 11.B(2) for pending charges only. The detail of each yes answer is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/114085

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $28,813,000,000 | 6 | September 16, 2021 |
| October 2022 | $31,583,485,945 | 11 | March 31, 2022 |
| October 2023 | $25,569,711,808 | 12 | September 14, 2023 |
| October 2024 | $28,558,864,166 | 14 | June 10, 2024 |
| October 2025 | $35,039,451,532 | 13 | March 28, 2025 |
| October 2026 | $39,079,170,300 | 13 | March 31, 2026 |

Regulatory assets under management: $28,813,000,000 in the October 2021 data and $39,079,170,300 in the October 2026 data, up 36%.
Total employees: 6 in October 2021 and 13 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Regulatory assets under management went from $35,039,451,532 to $39,079,170,300 (+12%).
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Mason Street Advisors, LLC (CRD 114085): Form ADV filing data as of October 2026.