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Main Street Research LLC

Updated today

Client AUM

$2,621,086,556

Clients

1,018

Advisors

20

across 3 offices

About

Main Street Research LLC provides wealth management to individuals, families, foundations, and institutions, delivering comprehensive financial planning and discretionary investment management. The firm manages roughly $2.68 billion for about 1,018 client relationships through a multi‑advisor team of 17 and serves both non‑high‑net‑worth and high‑net‑worth clients, with outside chief investment officer services available for institutional or foundation clients.

Investment advice is tailored through in‑depth client interviews and an investment policy process overseen by an internal investment committee that applies fundamental, quantitative, and technical analysis. Portfolios emphasize individual securities — domestic and foreign stocks, bonds, REITs, MLPs, and preferred stock — with ETFs used for diversification or access, and the firm offers an ESG model and the ability to select sub‑advisors for specialized strategies.

Notably, MSR offers an elective performance‑based fee schedule (available only to Rule 205‑3 qualified clients) that combines a management fee with a quarterly performance allocation subject to a high‑water mark and tiered allocation percentages. The firm also engages sub‑advisors for specialized overlays — including an options/collar program for concentrated stock positions (via SpiderRock Advisors) and an active long/short tax‑loss harvesting strategy (via Quantinno) that requires margin — and requires a 24‑month commitment when clients change fee schedules.

Client services

Financial planning Portfolio management Educational seminars or workshops Consulting

Expertise

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management

Occupation focus

Founder/Business Owner Executive

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Fee options

Percentage

$0 - $2,000,000: 1.2500% (Traditional Fee Schedule) $2,000,000 - $5,000,000: 1.0000% (Traditional Fee Schedule) $5,000,000 - $10,000,000: 0.7500% (Traditional Fee Schedule) $10,000,000 - $20,000,000: 0.5000% (Traditional Fee Schedule) $20,000,000 - $40,000,000: 0.2500% (Traditional Fee Schedule) $40,000,000 - $60,000,000: 0.1500% (Traditional Fee Schedule) $60,000,000+: 0.1000% (Traditional Fee Schedule) $0 - $2,000,000: 0.7500% (Performance Fee Schedule) $2,000,000 - $5,000,000: 0.6250% (Performance Fee Schedule) $5,000,000 - $10,000,000: 0.5000% (Performance Fee Schedule) $10,000,000 - $20,000,000: 0.2500% (Performance Fee Schedule) $20,000,000 - $40,000,000: 0.1500% (Performance Fee Schedule) $40,000,000+: 0.1000% (Performance Fee Schedule)

Performance-based

Performance fee calculated quarterly based on net profits with rates from 5% (assets < $5M) down to 1% (assets > $60M), subject to a high water mark. Requires 'qualified client' status with at least $1,100,000 AUM or $2,200,000 net worth.

Other

Account minimum: $1,000,000 for Traditional Fee Schedule; $1,100,000 for Performance Fee Schedule (negotiable in limited circumstances)

Main office

See office

342 Main Street

Lakeville CT 06039

Advisors at this office

14

Most active in

Alabama · Arizona · Arkansas · California · Colorado · Connecticut · Delaware · District of Columbia · Florida · Georgia · Hawaii · Illinois · Indiana · Iowa · Kentucky · Louisiana · Maine · Maryland · Massachusetts · Michigan · Minnesota · Missouri · Montana · Nevada · New Hampshire · New Jersey · New Mexico · New York · North Carolina · North Dakota · Ohio · Oregon · Pennsylvania · Rhode Island · South Carolina · Tennessee · Texas · Utah · Vermont · Virginia · Washington · West Virginia

Disclosures

Exclamation point means they have disclosures of this type. Check mark means no disclosures of this type were found.

Business activities & affiliations

Advisors at this firm

user avatar

Jacob S

Series 65

Lakeville, CT

Main Street Research LLC

Jacob Swartz is a financial advisor at Main Street Research LLC with a Series 65 designation and four years of industry experience. Prior to joining Main Street Research in 2021, he worked at Bloomberg LP for two years and attended Chapman University from 2015 to 2019. Main Street Research LLC is a multi-advisor investment firm managing approximately $2.38 billion for around 920 clients. The firm offers wealth management and consulting services to individuals, families, foundations, and institutions, employing a combination of fundamental, quantitative, and technical analysis to construct portfolios primarily of individual securities, with selective use of ETFs and ESG factor scoring for interested clients.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Henrique C

Series 63, Series 65

Lakeville, CT

Main Street Research LLC

Henrique Cataldi is a financial advisor at Main Street Research LLC with seven years of industry experience. He holds Series 63 and Series 65 licenses and has previously worked at firms including Scratch Services LLC, Charles Schwab, Edward Jones, and EQIS Capital Management. Main Street Research LLC provides wealth management services to individuals, families, foundations, and institutions through a multi-advisor team. The firm employs an investment process combining fundamental, quantitative, and technical analysis, offering tailored portfolios that emphasize individual securities alongside ETFs for diversification.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive

Andrew M

CFP®, Series 66

Lakeville, CT

Main Street Research LLC

Andrew Marchionni is a Financial Consultant currently with Fidelity Investments, a role he has held since 2022. He has previously served as a Private Client Advisor at Oppenheimer & Co. in 2022, Assistant Vice President - Financial Advisor at Bank of America Merrill Lynch from 2018 to 2022, and as a Financial Consultant at Equitable Advisors from 2017 to 2018. In his professional approach, Andrew focuses on building long-term relationships with clients based on trust and transparency. He works closely with clients to understand their goals and vision for the future, co-creating and implementing tailored financial plans. He also monitors and adjusts these plans as clients’ lives change to ensure they meet evolving needs.

General retirement planning Wealth management Founder/Business Owner Executive
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Bridget J

Series 63, Series 66

Greenwich, CT

Main Street Research LLC

Bridget Johanson is a financial advisor at Main Street Research LLC with three years of industry experience. She holds Series 63 and 66 licenses and previously worked at Fidelity Investments. Main Street Research LLC provides wealth management services to individuals, families, foundations, and institutions, offering comprehensive financial planning and discretionary investment management through a multi-advisor team. The firm emphasizes tailored investment strategies using fundamental, quantitative, and technical analysis across a variety of securities and also offers ESG models and specialized sub-advisor strategies.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Natalie M

CFP®

Lakeville, CT

Main Street Research LLC

Natalie Mc Mahon is a CFP® professional with six years of industry experience, currently serving as an advisor at Main Street Research LLC since 2015. She is based in Lakeville, Connecticut, and has worked exclusively at Main Street Research during her career. Main Street Research LLC is a multi-advisor investment firm managing approximately $2.38 billion for about 920 clients. The firm offers wealth management, financial planning, and consulting services to individuals, families, foundations, and institutional clients, utilizing a combination of fundamental, quantitative, and technical analysis to construct portfolios that primarily use individual securities with selective ETF inclusion.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Elizabeth B

Series 65

Lakeville, CT

Main Street Research LLC

Elizabeth Baldassari is a Series 65-licensed advisor at Main Street Research LLC with six years of industry experience. She has been with Main Street Research since 1998. Main Street Research LLC is a multi-advisor investment firm managing approximately $2.38 billion for about 920 clients, offering wealth management and consulting services to individuals, families, foundations, and institutional clients. The firm uses a combination of fundamental, quantitative, and technical analysis to manage discretionary portfolios and incorporates ESG factors and risk-management tools where appropriate.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Matthew N

CFP®, Series 66

Greenwich, CT

Main Street Research LLC

Matthew Northrop is a CFP® with 12 years of industry experience, currently serving as an advisor at Main Street Research LLC since 2024. His prior experience includes six years at E*TRADE Capital Management LLC and E*TRADE Securities LLC. Main Street Research LLC provides wealth management services to individuals, families, foundations, and institutions, managing approximately $2.68 billion across about 1,018 client relationships. The firm offers comprehensive financial planning and discretionary investment management through a multi-advisor team, utilizing a rigorous investment policy process that incorporates fundamental, quantitative, and technical analysis.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Lily T

CFA®, Series 65

Lakeville, CT

Main Street Research LLC

Lily Taft is a CFA® charterholder and holds a Series 65 license with six years of industry experience. She has been with Main Street Research LLC since 2019 and previously worked at Shelton Capital Management and held various roles connected to Tulane University. Main Street Research LLC is a multi-advisor firm managing approximately $2.38 billion for about 920 clients, offering wealth management and consulting services to individuals, families, foundations, and institutions. The firm employs a combination of fundamental, quantitative, and technical analysis to construct portfolios, incorporates ESG factor scoring for interested clients, and uses risk-management tools such as stop-loss orders and option overlays.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Emily S

Series 65

Lakeville, CT

Main Street Research LLC

Emily Slama is a financial advisor at Main Street Research LLC with a Series 65 credential and two years of industry experience. Her prior work includes roles at JPMorgan Chase and Co., Deloitte and Touche, and Beltrano Law, LLC. Main Street Research LLC is a multi-advisor firm managing approximately $2.38 billion for about 920 clients, offering wealth management and consulting services to individuals, families, foundations, and institutional clients. The firm employs a combination of fundamental, quantitative, and technical analysis to manage discretionary portfolios, incorporates ESG factor scoring for interested clients, and utilizes risk-management tools such as stop-loss orders and option overlays.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Aaron S

Series 65

Lakeville, CT

Main Street Research LLC

Aaron Stern is a Series 65-licensed financial advisor with 11 years of industry experience, currently with Main Street Research LLC. He has been with the firm since 2005, working there continuously except for a brief gap between 2018 and 2019. Main Street Research LLC is a multi-advisor investment firm managing approximately $2.38 billion for around 920 clients. The firm serves individuals, families, foundations, and institutional clients with wealth management and consulting, employing a combination of fundamental, quantitative, and technical analysis to construct portfolios primarily of individual securities, supplemented by ETFs for diversification and specialized strategies.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Stephanie A

Series 65

Lakeville, CT

Main Street Research LLC

Stephanie Andersen is a financial advisor at Main Street Research LLC with nine years of industry experience. She holds a Series 65 designation and has been with Main Street Research since 2015. Main Street Research LLC is a multi-advisor investment firm managing approximately $2.38 billion for about 920 clients. The firm offers wealth management and consulting services to individuals, families, foundations, and institutional clients, employing a blend of fundamental, quantitative, and technical analysis to construct portfolios that primarily use individual securities with selective ETF use.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Michael R

Series 65

Sausalito, CA

Main Street Research LLC

Michael Roy is a financial advisor with Main Street Research LLC, holding a Series 65 designation and 13 years of industry experience. His prior work includes roles at Fisher Investments, Canter Wealth, and Zacks Investment Management. Main Street Research LLC provides wealth management services to individuals, families, foundations, and institutions, managing approximately $2.68 billion across over 1,000 client relationships. The firm delivers tailored investment advice through a multi-advisor team and offers discretionary management emphasizing individual securities alongside diversified strategies such as ESG models and specialized sub-advisors.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

James D

Series 63, Series 65

Lakeville, CT

Main Street Research LLC

James Demmert is a financial advisor at Main Street Research LLC with 11 years of industry experience. He holds the Series 63 and Series 65 designations and has been with Main Street Research since 1993. Main Street Research LLC is a multi-advisor investment firm managing approximately $2.38 billion for about 920 clients, offering wealth management and consulting services to individuals, families, foundations, and institutional clients. The firm employs a combination of fundamental, quantitative, and technical analysis to manage discretionary portfolios, incorporating ESG factors and risk-management tools, and is notable for offering performance-based fee arrangements alongside traditional fees.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Janelle D

Series 65

Lakeville, CT

Main Street Research LLC

Janelle Durbin is a financial advisor at Main Street Research LLC with a Series 65 designation and three years of industry experience. She previously worked at LPL Financial and Nicole E Stokes, among other firms. Main Street Research LLC is a multi-advisor investment adviser managing approximately $2.38 billion for around 920 clients. The firm offers wealth management and consulting services to individuals, families, foundations, and institutional clients, using a combination of fundamental, quantitative, and technical analysis to construct discretionary portfolios.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
user avatar

Benjamin A

Series 65

Greenwich, CT

Main Street Research LLC

Benjamin Armellini is a financial advisor at Main Street Research LLC with 10 years of industry experience. He holds a Series 65 designation and has been with Main Street Research since 2015, joining the affiliated firm Main Street Research LLC in 2017. Main Street Research LLC is a multi-advisor investment adviser managing approximately $2.38 billion for about 920 clients. The firm offers wealth management and consulting services to individuals, families, foundations, and institutional clients, employing a combination of fundamental, quantitative, and technical analysis to construct portfolios primarily using individual securities, with selective use of ETFs and ESG factor scoring for clients interested in sustainable investing.

ESG / Sustainable investing Concentrated stock management Options & derivatives strategies Tax-loss harvesting Wealth management Founder/Business Owner Executive
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