Peter Mainstain
Investment Adviser Representative at AMI Asset Management Corp
Professional summary
Compiled by AdvisorFinder from public regulatory records. This advisor has not provided a personal biography.
Peter Mainstain is an investment adviser representative with AMI Asset Management Corp in Los Angeles, CA, where they have been registered since 2001, the year they entered the securities industry. They have passed the Series 65 (investment adviser) exam. They are registered to provide investment advice in California.
Office
Advisors at this office: 8
Branch office as filed with FINRA, counting current advisors in the directory who work there.
Registrations & licenses
- Investment adviser:
- California
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.
- Tanner Mainstain Glynn & Johnson LLPJun 1975 – Jun 2021Los Angeles, CA
- Tanner Mainstain Glynn & Johnson LLCJul 2021 – Mar 2023Los Angeles, CA
- Ground Control Business ManagementApr 2023 – no end date reportedLos Angeles, CA
- AMI Asset ManagementSep 1993 – no end date reportedLos Angeles, CA
Official records & sources
Data as of May 30, 2026 · Source: SEC IAPD & FINRA BrokerCheck
About AMI Asset Management Corp
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
Customized investment solutions including Large Cap Growth Equity, Large Cap Equity Income, and Small Cap Growth Equity strategies, offered to both individual and institutional investors through active management with a recurring revenue and GARP focus.
Client types the firm serves
Firm assets under management
$1B–$5B
- Firm disclosures (Form ADV)
- No disciplinary history reportedVerify on SEC IAPD
- Advisors listed on AdvisorFinder:
- 9
- Offices listed on AdvisorFinder:
- 2
- Main office:
- Los Angeles, CA
- Founded:
- 1994
- SEC file number:
- 801-47318
Counts reflect AdvisorFinder directory coverage, not necessarily the firm's complete network.
Form ADV data as of July 23, 2026
View full firm profileOther advisors at AMI Asset Management Corp
8 other advisors in the directory
Similar advisors in Los Angeles, CA
Other advisors whose filed branch office is in the same city.
This profile was compiled and published by AdvisorFinder as editorial content using publicly available information from the SEC's IAPD database and FINRA BrokerCheck. Peter Mainstain 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.
BrokerCheck data is used subject to the FINRA BrokerCheck Terms of Use. Found something inaccurate? Report inaccurate data and we will correct any error we introduced. Errors in the underlying BrokerCheck record itself are referred to FINRA, which maintains that record.
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