Merrill
47yrs
Top advisor by experience in Indianapolis
10yrs
Gregory Mantz is a fiduciary financial advisor in Indianapolis, Indiana, with 10 years in the industry. After three years at Thrivent Investment Management, Gregory joined Oneamerica Securities in 2019, a firm offering financial planning, investment management, and retirement plan consulting. Gregory’s designations include CFP® and ChFC.
One of 1738 advisors with offices in Indianapolis, and one of 1555 fiduciaries.
At a glance
Experience10 years (since 2016)
How that compares ?10 years in the industry
OfficeOne American Square, Indianapolis, IN 46282
How the firm is paid ?Percent of assets, Hourly, Flat fee
Typical client at the firm ?$133,065
Advisors at the firm335
States licensed ?1 state
Services through Oneamerica Securities
Financial planningInvestment management for individuals and small businessesInvestment management for businesses and institutionsRetirement plan consultingChoosing other investment managersEducational seminars and workshops
Specialties, designations like CFP®, and languages spoken appear here when advisors claim their profiles.
Designations
CFP®ChFC
Licenses
Exams passed, from the official record. Tap a license to see what it allows.
Series 66Uniform Combined State Law Examination
Career
- 2019 – nowOneamerica Securities, Inc.Current firm
- 2016 – 2019Thrivent Investment Management Inc.Previously
Contact Gregory
(877) 285-3863Oneamerica Securities main office One American SquareIndianapolis, IN 46282Office · Get directions Firm websiteHTTP://WWW.ONEAMERICASECURITIES.COM
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Questions to ask Gregory
Tailored to Gregory’s registration and firm.
- At a firm this size, will I work with you directly or with a service team?
- What does a financial plan with you include, and how often is it updated?
- If you use outside managers, how are they chosen and what do they cost on top of your fee?
- Where would my money be held, and will I get statements directly from that firm?
- What would I pay in total each year, in dollars, including fund and trading costs?
My notes and scorecard
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About Gregory
How do I contact Gregory?
Call Oneamerica Securities at (877) 285-3863 and ask for Gregory Mantz. Gregory works from the Indianapolis, IN office.
How long has Gregory been a financial advisor?
Gregory has been in the industry since 2016, about 10 years. 10 years in the industry.
What licenses does Gregory hold?
Series 66. Tap any license on this page to see what it allows.
Is Gregory a fiduciary?
Gregory is registered as an investment advisor representative, which carries a fiduciary duty when giving investment advice.
How is Gregory paid?
Oneamerica Securities reports being paid by a percentage of the assets they manage, hourly fees, flat or fixed fees. Ask Gregory for your total yearly cost in dollars.
Official record as of October 3, 2026.
This profile is for information only and is not financial advice or a recommendation.
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