Private fund adviser · Oak Brook, IL
Rock Island Capital
Rock Island Capital, LLC · SEC-registered investment adviser · CRD 161623 · SEC 801-76979
At a glance
Rock Island Capital is an SEC-registered investment adviser based in Oak Brook, Illinois, with $637 million in regulatory assets under management as of its Form ADV filed March 26, 2026. Its largest client group by assets is pooled investment vehicles. By Form ADV it is a private fund adviser, ranked 2,767th of 4,686 private fund advisers and 6,884th of 17,210 SEC-registered advisers by assets.
Main office 630-413-9136rockislandcapital.comLinkedInAs filed on Form ADV
- Regulatory AUM
- $637M
- Rank among private fund advisers
- #2,767 of 4,686
- Rank among all SEC RIAs
- #6,884 of 17,210
- Rank in Illinois
- #326 of 684
- Clients
- 13
- Accounts
- 13
- Discretionary
- 100% of AUM
- Employees
- 10
- Advisory staff
- 10
- Offices
- 1
Owners and executives on its Form ADV
- Zofia N. MietusChief Compliance Officer, Chief Financial Officer
- Alfred M. MattalianoPartner, Managing Member
- Michael E. NugentPartner, Managing Member
- Brian E. BastedoPartner, Managing Member
Custody and brokerage
Custodian
Rock Island Capital’s Form ADV lists no custodian for separately managed accounts. Firms report one only when they manage $10 million or more in those accounts.
Who it serves
| Client type | Clients | Regulatory AUM | Share |
|---|---|---|---|
| Pooled investment vehicles | 13 | $637M | 100% |
Private funds
Rock Island Capital reports 13 private funds with $866M in gross assets: private equity funds (Form ADV Item 7.B).
Disciplinary disclosures
Rock Island Capital reports no disciplinary disclosures in Item 11 of Form ADV. Read the details on the SEC’s adviser search ↗
Services
- Portfolio management for pooled investment vehicles
- Other services
How it’s paid
- A percentage of assets under management
- Performance-based fees
- Other
Form ADV and brochures on the SEC’s adviser search ↗rockislandcapital.com ↗
AtlasMembers
The full record on Rock Island Capital
Ten years of SEC filings, its owners and contacts, and how it stacks up against its peers. Atlas members see all of it.
- Assets, accounts, clients and staff, ten years of filings
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- Growth over one, three and five years
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- Rank against 2,276 peers of its type and size
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- Owners and executives, with titles and stakes
- 4 namedLocked
- Main office, fax and compliance officer
- Locked
- Filing changes this year, with alerts
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Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.
Background
Questions
How much does Rock Island Capital manage?
Rock Island Capital reports $637 million in regulatory assets under management across 13 accounts, 100% of it on a discretionary basis, on its Form ADV filed March 26, 2026.
What kind of firm is Rock Island Capital?
Rock Island Capital is a private fund adviser by its Form ADV answers. Private funds are at least half of its business by assets.
Who are Rock Island Capital’s clients?
By assets, its largest client types are pooled investment vehicles ($637 million, 13 clients).
Does Rock Island Capital manage private funds?
Yes. It reports 13 private funds with $866 million in gross assets, including private equity funds.
Does Rock Island Capital have any disciplinary history?
Rock Island Capital reports no disciplinary disclosures in Item 11 of its Form ADV. Check the SEC’s adviser search for the latest record.
Where these numbers come from
Every figure is Rock Island Capital’s own answer on its latest Form ADV, from the SEC’s registered-adviser list as of October 1, 2026: regulatory assets and accounts (Item 5.F), clients by type (5.D), employees (5.A and 5.B), compensation (5.E) and services (5.G). Custodians come from Schedule D 5.K(3) of its latest filing (2026-03-26), which lists those holding 10% or more of separately managed account assets and the amount at each. “Hybrid” means some employees are also registered representatives of a broker-dealer (Item 5.B(2)); affiliated broker-dealers are the related persons it lists in Item 7.A and Schedule D. Firm type comes from its own answers: broker-dealer firms are registered broker-dealers themselves (Item 6.A); private fund advisers manage mostly private funds (Item 7.B, 5.D); wealth managers manage at least half their assets for individuals (5.D). Ranks compare it by regulatory assets with every SEC-registered adviser and with firms of its type. Figures are as of the firm’s last annual update, so they can lag recent deals and market moves. Regulatory AUM counts assets the firm continuously supervises and can differ from what a firm markets.
Not an endorsement or a recommendation. Before hiring any adviser, read its Form ADV Part 2A brochure and check its record on the SEC’s adviser search. How to check a financial advisor →