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RIA / WealthRegistered adviserindependent wealth managerSEC registeredRAUM 1b 10b

MAIN STREET RESEARCH LLC

CRD 114629

LAKEVILLE, CT

This is the graph view. The full profile, with its team, deals and sources, is on RIA / Wealth Management.Open the full profile →

Search this name across graphsid dfx:ria:49f181e4-d4d1-830b-26ad-a314bad970d4

Data as of Apr 27, 2026 (this record's last observation) from federal regulator filings. Page built Sep 19, 2026, 10:14 AM UTC and rebuilt at most every 15 minutes.

Relationships: 22
Dated events: 7
On other graphs: 0
Observed: Nov 21, 2011 to Apr 27, 2026
60 observations

Across DFX

This entity has not been resolved onto another DFX graph by a shared identifier. A name match elsewhere would be a candidate, never an identity, and none is recorded.

Facts

fact = as filed or announced; derived = computed by DFX; estimate = a band, never a point

Firm class: independent wealth managerderivedprivate_client_share=0.98 fund_share=0.0 institutional_share=0.02 related_bd=false related_bank=false bd_reps=0.0
Regulatory AUM: $2.7BItem 5.F on the latest filing (2026-04-27); as reported, and an affiliate's assets may be counted again on its own filing
Discretionary RAUM: $2.7B
Private client RAUM: $2.6BderivedItem 5.D individuals plus high net worth individuals
Private client share: 98%derivedprivate client RAUM over total RAUM
Advisors on IAPD: 17
RAUM per advisor: $158Mderivedthe firm's RAUM over its IAPD headcount: a firm average, never a person's book
Employees: 24
Advisory employees: 16
Offices: 4Schedule D 1.F, beyond the principal office
Accounts: 3,017
Individual clients: 203
High net worth clients: 815
Custody, client assets: $2.7B
SEC number: 801-57739
CIK: 1513211
CRD: 114629
Filings on the tape: 60
First filed: Nov 21, 2011
Latest filed: Apr 27, 2026
Organised: Limited Liability Company, CT

Advisors on IAPD

current investment adviser representatives on the IAPD individual feed, longest tenure first

Advisor	Designations	Branch	Years here	In industry	Prior firms	Dual registered
JAMES EDMUND DEMMERT	n/a	LAKEVILLE, CT \| Lakeville, CT	11	39	n/a	no
AARON MICHAEL STERN	n/a	LAKEVILLE, CT	11	21	n/a	no
BENJAMIN B ARMELLINI	n/a	Greenwich, CT \| LAKEVILLE, CT	10	11	n/a	no
Stephanie Hawk Andersen	n/a	LAKEVILLE, CT	10	10	n/a	no
Elizabeth Irene Baldassari	n/a	LAKEVILLE, CT	7	27	n/a	no
LILY NICOLE TAFT	Chartered Financial Analyst	LAKEVILLE, CT	6	11	n/a	no
Natalie Elaine McMahon	Certified Financial Planner	LAKEVILLE, CT	6	11	n/a	no
Jacob Adam Swartz	n/a	LAKEVILLE, CT	5	11	n/a	no
Jacob Lionel Margo	n/a	LAKEVILLE, CT	4	12	3	no
Peter A Fiorita	Certified Financial Planner	Greenwich, CT \| LAKEVILLE, CT	4	10	1	no
Roman Tyler LeFebure	n/a	LAKEVILLE, CT	4	10	1	no
HENRIQUE CATALDI	n/a	LAKEVILLE, CT	4	19	3	no
MATTHEW CRAIG NORTHROP	Certified Financial Planner	LAKEVILLE, CT \| Greenwich, CT	2	14	3	no
Michael John Sondag	n/a	LAKEVILLE, CT \| Sausalito, CA	2	13	n/a	no
Alexandra Mary Rooney	Certified Financial Planner	LAKEVILLE, CT \| Greenwich, CT	2	12	3	no
Janelle Durbin	n/a	LAKEVILLE, CT \| Sausalito, CA	1	11	2	no
Emily Slama	n/a	LAKEVILLE, CT \| Greenwich, CT	1	11	n/a	no

Owners and control persons

Schedule A and B as filed; ownership codes are the form's bands (NA under 5%, A 5 to 10%, B 10 to 25%, C 25 to 50%, D 50 to 75%, E over 75%); people are listed as filed and never merged by name

Owner	Title	Ownership code	Control person	Acquired	First seen	Last seen
ARMELLINI, BENJAMIN, B	PARTNER - CHIEF EXECUTIVE OFFICER	A	yes	04/2026	Apr 27, 2026	Apr 27, 2026
DEMMERT, JAMES, EDMUND	MANAGING PARTNER AND CHIEF INVESTMENT OFFICER	E	yes	04/2000	Apr 27, 2026	Apr 27, 2026
McMahon, Natalie, Elaine	CHIEF COMPLIANCE OFFICER	Na	yes	02/2024	Apr 27, 2026	Apr 27, 2026
STERN, AARON, MICHAEL	MANAGING PARTNER AND PORTFOLIO MANAGER	A	yes	08/2020	Apr 27, 2026	Apr 27, 2026
TAFT, LILY, NICOLE	MANAGING PARTNER	Na	yes	04/2026	Apr 27, 2026	Apr 27, 2026

Offices

Schedule D 1.F offices beyond the principal office; street addresses are not published

City	State	Country	Employees	Also broker-dealer
Greenwich	Ct	United States	3	no
Lakeville	Ct	United States	1	no
NEW YORK	NY	United States	1	no

Regulatory AUM by fiscal year

annual amendments (and the roster's annual snapshot) as filed; where a year was amended twice the later filing draws the line; showing 15 of 16

Fiscal year	Filed	RAUM	Discretionary	Employees	Advisory staff	Offices	Private funds	Fund GAV
2025	Apr 27, 2026	$2.7B	$2.7B	24	16	4	n/a	n/a
2024	Mar 25, 2025	$2.4B	$2.4B	24	16	4	n/a	n/a
2023	Feb 2, 2024	$1.8B	$1.8B	21	11	3	n/a	n/a
2022	Mar 29, 2023	$1.7B	$1.7B	23	11	3	n/a	n/a
2021	Mar 30, 2022	$2.0B	$2.0B	22	10	2	n/a	n/a
2020	Mar 30, 2021	$1.4B	$1.4B	13	10	1	n/a	n/a
2019	Mar 23, 2020	$1.1B	$1.1B	13	9	1	n/a	n/a
2018	Mar 19, 2019	$1.0B	$1.0B	12	6	0	n/a	n/a
2017	Mar 29, 2018	$946M	$946M	9	5	0	n/a	n/a
2016	Mar 22, 2017	$709M	$709M	9	4	n/a	n/a	n/a
2015	Mar 29, 2016	$651M	$651M	9	4	n/a	n/a	n/a
2014	Mar 27, 2015	$619M	$619M	7	3	n/a	n/a	n/a
2013	Mar 27, 2014	$503M	$503M	7	2	n/a	n/a	n/a
2012	Mar 28, 2013	$443M	$443M	6	2	n/a	n/a	n/a
2011	Mar 29, 2012	$401M	$401M	n/a	n/a	n/a	n/a	n/a

Advisor flows

derived: registrations beginning and ending at this CRD on IAPD, bulk corporate re-registrations excluded; the rate is departures over IAPD headcount

Joined, 12m	Left, 12m	Net, 12m	Departure rate, 12m	Joined, 90d	Left, 90d	Left, no destination yet	Joined, 36m	Left, 36m
0	0	0	0.0%	0	0	0	3	1

Growth

derived from consecutive annual filings; RAUM as reported

Latest fiscal year	RAUM	A year earlier	1y change	Three years earlier	3y CAGR	Employees	A year earlier	Offices	A year earlier
2025	$2.7B	$2.4B	12.5%	$1.7B	17.0%	24	24	4	4

Relationships

Registered with (18)

← Emily SlamaAdvisorregistration: current employment
May 10, 2025 to presentfactForm ADV
← Janelle DurbinAdvisorregistration: current employment
Sep 26, 2024 to presentfactForm ADV
← Alexandra Mary RooneyAdvisorregistration: current employment
Jul 29, 2024 to presentfactForm ADV
← Michael John SondagAdvisorregistration: current employment
May 16, 2024 to presentfactForm ADV
← MATTHEW CRAIG NORTHROPAdvisorregistration: current employment
Jan 2, 2024 to presentfactForm ADV
← HENRIQUE CATALDIAdvisorregistration: current employment
Apr 8, 2022 to presentfactForm ADV
← Roman Tyler LeFebureAdvisorregistration: current employment
Dec 2, 2021 to presentfactForm ADV
← Peter A FioritaAdvisorregistration: current employment
Oct 20, 2021 to presentfactForm ADV
← Jacob Lionel MargoAdvisorregistration: current employment
Oct 15, 2021 to presentfactForm ADV
← Jacob Adam SwartzAdvisorregistration: current employment
Jun 28, 2021 to presentfactForm ADV
← Natalie Elaine McMahonAdvisorregistration: current employment
Jan 30, 2020 to presentfactForm ADV
← LILY NICOLE TAFTAdvisorregistration: current employment
Dec 12, 2019 to presentfactForm ADV
← Elizabeth Irene BaldassariAdvisorregistration: current employment
Jun 11, 2019 to presentfactForm ADV
← Stephanie Hawk AndersenAdvisorregistration: current employment
Jun 27, 2016 to presentfactForm ADV
← BENJAMIN B ARMELLINIAdvisorregistration: current employment
Dec 21, 2015 to presentfactForm ADV
← JAMES EDMUND DEMMERTAdvisorregistration: current employment
Nov 24, 2014 to presentfactForm ADV
← AARON MICHAEL STERNAdvisorregistration: current employment
Nov 24, 2014 to presentfactForm ADV
← SHANE PATRICK LARSONAdvisorregistration: previous registration
May 9, 2022 to Oct 27, 2023factForm ADV

Controls (3)

← DEMMERT, JAMES, EDMUNDOwnerMANAGING PARTNER AND CHIEF INVESTMENT OFFICER, ownership code E, individual
Nov 21, 2011 to Nov 15, 2024factForm ADV
← STERN, AARON, MICHAELOwnerMANAGING PARTNER -WEST, PORTFOLIO MANAGER, ownership code A, individual
Sep 4, 2020 to Nov 15, 2024factForm ADV
← McMahon, Natalie, ElaineOwnerPARTNER AND CHIEF OPERATING OFFICER, ownership code NA, individual
Mar 30, 2022 to Nov 15, 2024factForm ADV

Owns (1)

← ARMELLINI, BENJAMIN, BOwnerMANAGING PARTNER- EAST, PORTFOLIO MANAGER, ownership code NA, individual
Sep 4, 2020 to Nov 15, 2024factForm ADV

Dated events

Occurred
Mar 25, 2025
Regulatory AUM changed
Main Street Research Llc reported RAUM $2.4B, up 31% from $1.8B (2024-11-15 to 2025-03-25)
Form ADVobserved 4 days ago
$568M
Occurred
Oct 27, 2023
Advisor changed firm
Shane Patrick Larson left Main Street Research Llc for Composition Wealth, Llc (registered 2025-01-02)
Form ADVobserved 4 days ago
Occurred
Mar 30, 2022
Regulatory AUM changed
Main Street Research Llc reported RAUM $2.0B, up 41% from $1.4B (2022-03-03 to 2022-03-30)
Form ADVobserved 4 days ago
$573M
Occurred
Mar 30, 2022
Control person joined
Elaine Natalie Mcmahon (Chief Operating Officer) appeared on Schedule A of Main Street Research Llc
Form ADVobserved 4 days ago
Occurred
Mar 30, 2021
Regulatory AUM changed
Main Street Research Llc reported RAUM $1.4B, up 27% from $1.1B (2021-01-04 to 2021-03-30)
Form ADVobserved 4 days ago
$299M
Occurred
Sep 4, 2020
Control person left
Ann Tamra Stern (Chief Compliance Officer) no longer on Schedule A of Main Street Research Llc (listed 2020-08-25, absent 2020-09-04)
Form ADVobserved 4 days ago
Occurred
Mar 29, 2018
Regulatory AUM changed
Main Street Research Llc reported RAUM $946.2M, up 33% from $709.2M (2017-09-08 to 2018-03-29)
Form ADVobserved 4 days ago
$237M

Provenance

Graph: RIA / Wealth Management
Canonical id: dfx:ria:49f181e4-d4d1-830b-26ad-a314bad970d4
First observed: Nov 21, 2011
Last observed: Apr 27, 2026 4 months ago
Source families: Federal regulator filings
3 registered feeds stand behind this record; each fact above carries its own dates and, where the publisher serves one, its document.
Resolution: Identity across graphs by shared identifier (CRD, CIK, EIN, ADV fund id, individual CRD) or citation; a name match is shown as a candidate and never merged.

MAIN STREET RESEARCH LLC

CRD 114629

LAKEVILLE, CT

This is the graph view. The full profile, with its team, deals and sources, is on RIA / Wealth Management.Open the full profile →

Search this name across graphsid dfx:ria:49f181e4-d4d1-830b-26ad-a314bad970d4

Data as of Apr 27, 2026 (this record's last observation) from federal regulator filings. Page built Sep 19, 2026, 10:14 AM UTC and rebuilt at most every 15 minutes.

Advisor

Designations

Branch

Years here

In industry

Prior firms

Dual registered

JAMES EDMUND DEMMERT

n/a

LAKEVILLE, CT | Lakeville, CT

n/a

AARON MICHAEL STERN

n/a

LAKEVILLE, CT

n/a

BENJAMIN B ARMELLINI

n/a

Greenwich, CT | LAKEVILLE, CT

n/a

Stephanie Hawk Andersen

n/a

LAKEVILLE, CT

n/a

Elizabeth Irene Baldassari

n/a

LAKEVILLE, CT

n/a

LILY NICOLE TAFT

Chartered Financial Analyst

LAKEVILLE, CT

n/a

Natalie Elaine McMahon

Certified Financial Planner

LAKEVILLE, CT

n/a

Jacob Adam Swartz

n/a

LAKEVILLE, CT

n/a

Jacob Lionel Margo

n/a

LAKEVILLE, CT

Peter A Fiorita

Certified Financial Planner

Greenwich, CT | LAKEVILLE, CT

Roman Tyler LeFebure

n/a

LAKEVILLE, CT

HENRIQUE CATALDI

n/a

LAKEVILLE, CT

MATTHEW CRAIG NORTHROP

Certified Financial Planner

LAKEVILLE, CT | Greenwich, CT

Michael John Sondag

n/a

LAKEVILLE, CT | Sausalito, CA

n/a

Alexandra Mary Rooney

Certified Financial Planner

LAKEVILLE, CT | Greenwich, CT

Janelle Durbin

n/a

LAKEVILLE, CT | Sausalito, CA

Emily Slama

n/a

LAKEVILLE, CT | Greenwich, CT

n/a

Owner

Title

Ownership code

Control person

Acquired

First seen

Last seen

ARMELLINI, BENJAMIN, B

PARTNER - CHIEF EXECUTIVE OFFICER

yes

04/2026

Apr 27, 2026

DEMMERT, JAMES, EDMUND

MANAGING PARTNER AND CHIEF INVESTMENT OFFICER

yes

04/2000

Apr 27, 2026

McMahon, Natalie, Elaine

CHIEF COMPLIANCE OFFICER

yes

02/2024

Apr 27, 2026

STERN, AARON, MICHAEL

MANAGING PARTNER AND PORTFOLIO MANAGER

yes

08/2020

Apr 27, 2026

TAFT, LILY, NICOLE

MANAGING PARTNER

yes

04/2026

Apr 27, 2026

City

State

Country

Employees

Also broker-dealer

Greenwich

United States

Lakeville

United States

NEW YORK

United States

Fiscal year

Filed

RAUM

Discretionary

Employees

Advisory staff

Offices

Private funds

Fund GAV

2025

Apr 27, 2026

$2.7B

n/a

2024

Mar 25, 2025

$2.4B

n/a

2023

Feb 2, 2024

$1.8B

n/a

2022

Mar 29, 2023

$1.7B

n/a

2021

Mar 30, 2022

$2.0B

n/a

2020

Mar 30, 2021

$1.4B

n/a

2019

Mar 23, 2020

$1.1B

n/a

2018

Mar 19, 2019

$1.0B

n/a

2017

Mar 29, 2018

$946M

n/a

2016

Mar 22, 2017

$709M

n/a

2015

Mar 29, 2016

$651M

n/a

2014

Mar 27, 2015

$619M

n/a

2013

Mar 27, 2014

$503M

n/a

2012

Mar 28, 2013

$443M

n/a

2011

Mar 29, 2012

$401M

n/a

Joined, 12m

Left, 12m

Net, 12m

Departure rate, 12m

Joined, 90d

Left, 90d

Left, no destination yet

Joined, 36m

Left, 36m

0.0%

Latest fiscal year

RAUM

A year earlier

1y change

Three years earlier

3y CAGR

Employees

A year earlier

Offices

A year earlier

2025

$2.7B

$2.4B

12.5%

$1.7B

17.0%