# Round Rock Advisors LLC

> Round Rock Advisors LLC is an SEC-registered investment advisory firm in Wilton, CT, registered since 2017, reporting $500 million to $1 billion in regulatory assets under management in its Form ADV filing dated June 22, 2026.

- CRD: 286007
- Filed as: ROUND ROCK ADVISORS LLC
- Also doing business as: ARMSTRONG SHAW, THOMSON, HORSTMANN & BRYANT ASSET MANAGEMENT
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Wilton, CT
- Filing period: October 2026
- Form ADV filing dated: June 22, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/286007
- AdvisorCensus page: https://advisorcensus.com/firm/round-rock-advisors-llc-wilton-ct-286007

## Quick answers

**How is Round Rock Advisors LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Round Rock Advisors LLC reports these compensation arrangements: a percentage of assets under its management; fixed fees (other than subscription fees).

**Where is Round Rock Advisors LLC located?**
Round Rock Advisors LLC's principal office is in Wilton, CT, according to its Form ADV; the July 2026 filing also lists 1 other office (Schedule D, Section 1.F).

**Is Round Rock Advisors LLC registered with the SEC or a state?**
Round Rock Advisors LLC is an SEC-registered investment advisory firm, registered since 2017. Status as filed: Approved. CRD 286007.

**How much does Round Rock Advisors LLC manage?**
Round Rock Advisors LLC reports $906,658,173 in regulatory assets under management in its Form ADV filing dated June 22, 2026 (100% discretionary).

**How have Round Rock Advisors LLC's assets and staff changed since 2021?**
In the Form ADV data for Round Rock Advisors LLC: Regulatory assets under management: $261,103,895 in the October 2021 data and $906,658,173 in the October 2026 data, up 247%. Total employees: 11 in October 2021 and 22 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Round Rock Advisors LLC serve?**
By number of clients on Form ADV Item 5.D: individuals (other than high net worth individuals) (420); high net worth individuals (202); other (11).

**Which custodians does Round Rock Advisors LLC use?**
Round Rock Advisors LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Charles Schwab & Co., Inc. as a custodian holding 10% or more of its separately managed account assets.

**Does Round Rock Advisors LLC report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/286007

**Does Round Rock Advisors LLC state an account minimum?**
Its Form ADV Part 2A brochure dated March 30, 2026 says: "Round Rock generally does not impose a minimum account size for establishing a relationship."

**What changed in Round Rock Advisors LLC's recent Form ADV filings?**
In the April 2026 filing data: Employees performing advisory functions went from 14 to 12. Regulatory assets under management went from $814,558,622 to $906,658,173 (+11%). No longer lists an office in White Plains, NY.

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Fixed fees (other than subscription fees)

### Fees and minimums (Form ADV Part 2A brochure dated March 30, 2026)

- Account minimum: None

> Round Rock generally does not impose a minimum account size for establishing a relationship.

As stated in the firm's brochure. Fees can differ by service and may be negotiable.

### Custodians (Schedule D, Section 5.K(3))
- Charles Schwab & Co., Inc.

Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian.

### Regulatory assets under management (Item 5.F)
- Total: $906,658,173
- Discretionary: $906,658,173
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 420 | $133,776,846 |
| High net worth individuals | 202 | $595,407,200 |
| Pooled investment vehicles (other than investment companies and business development companies) | 1 | $72,080,470 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | Fewer than 5 | $22,564,184 |
| Charitable organizations | 5 | $5,935,556 |
| Corporations or other businesses not listed above | 8 | $22,099,763 |
| Other | 11 | $54,794,154 |

### Advisory services (Item 5.G)
- Financial planning services
- Portfolio management for individuals and/or small businesses
- Portfolio management for pooled investment vehicles (other than investment companies)
- Pension consulting services
- Selection of other advisers (including private fund managers)

### Firm details
- Registered since: 2017 (9 years)
- Employees: 22 total, 12 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: CA, CO, CT, FL, IL, LA, MA, MD, NC, NH, NJ, NY, PA, SC, TX, VA, WA
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Other offices (Schedule D, Section 1.F), as of the July 2026 filing
- Harrison, NY

### Websites listed on Form ADV (Item 1.I)
- roundrockadvisors.com
- LinkedIn @roundrockadvisors
- LinkedIn @thbwealthmgt

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $261,103,895 | 11 | February 17, 2021 |
| October 2022 | $492,652,131 | 13 | April 25, 2022 |
| October 2023 | $484,811,266 | 16 | September 15, 2023 |
| October 2024 | $673,293,156 | 19 | March 21, 2024 |
| October 2025 | $814,558,622 | 24 | July 8, 2025 |
| October 2026 | $906,658,173 | 22 | June 22, 2026 |

Regulatory assets under management: $261,103,895 in the October 2021 data and $906,658,173 in the October 2026 data, up 247%.
Total employees: 11 in October 2021 and 22 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Employees performing advisory functions went from 14 to 12.
- Regulatory assets under management went from $814,558,622 to $906,658,173 (+11%).
- No longer lists an office in White Plains, NY.

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Round Rock Advisors LLC (CRD 286007): Form ADV filing data as of October 2026.