William James Ostrowski
Investment Adviser Representative at KEY Investment Services LLC
Professional summary
Compiled by AdvisorFinder from public regulatory records. This advisor has not provided a personal biography.
William James Ostrowski is an investment adviser representative with KEY Investment Services LLC in North Royalton, OH, where they have been registered since 2023, the year they entered the securities industry. They have passed 3 industry qualification exams, including the Series 66 (combined investment adviser and state securities agent) and Series 7 (general securities representative). They are registered to provide investment advice in Ohio.
Office
Advisors at this office: 2
Branch office as filed with FINRA, counting current advisors in the directory who work there.
Registrations & licenses
- Investment adviser:
- Ohio
- Broker:
10 states and territories
Arizona, California, Massachusetts, Michigan, New Jersey, New York, Ohio, Tennessee, Texas, Washington
Registration requirements vary by state and service. Contact the advisor's firm to confirm whether they can serve you.
Financial-firm registration history
Registration history as reported to FINRA, most recent first.
Reported employment history
Employment the advisor reported on their SEC/FINRA filings, as of October 8, 2026. It may not be a complete history.
- Dashs MarketsMay 2019 – Aug 2019Buffalo, NY
- Dashs MarketsMar 2020 – Aug 2021Buffalo, NY
- John Carroll UniversityFeb 2021 – Dec 2022University Heights, OH
- Egriu for CongressMay 2022 – Aug 2022Buffalo, NY
- John Carroll UniversityAug 2019 – May 2023University Heights, OH
- St Josephs Collegiate InstituteAug 2016 – May 2019Buffalo, NY
- Key Investment Services LLCJun 2023 – Oct 2023Brooklyn, OH
- Key Investment Services, LLCOct 2023 – no end date reportedBrooklyn, OH
Official records & sources
Data as of August 10, 2026 · Source: SEC IAPD & FINRA BrokerCheck
About KEY Investment Services LLC
These details describe the firm overall. Individual advisors' services, clients, and fees may differ.
Fee arrangements the firm reports
- Percentage of assets under management
Arrangements the firm reports on its Form ADV; this advisor may not charge every fee listed. Estimated from the firm's Form ADV — individual terms may differ. Not a quote.
Services the firm offers
Client types the firm serves
Firm assets under management
$5B–$25B
- Firm disclosures (Form ADV)
- Disciplinary history reportedVerify on SEC IAPD
- Advisors listed on AdvisorFinder:
- 638
- Offices listed on AdvisorFinder:
- 15
- Main office:
- Brooklyn, OH
- SEC file number:
- 801-65060
Counts reflect AdvisorFinder directory coverage, not necessarily the firm's complete network.
Form ADV data as of June 30, 2026
View full firm profileOther advisors at KEY Investment Services LLC
Showing 12 of 638 in the directory
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This profile was compiled and published by AdvisorFinder as editorial content using publicly available information from the SEC's IAPD database and FINRA BrokerCheck. William James Ostrowski has not reviewed, approved, or endorsed this profile and is not responsible for its accuracy. Regulatory records change over time — always verify the current record directly on BrokerCheck or SEC.gov before making any decision. AdvisorFinder may be compensated for referrals generated through this page.
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