Main Street Bank
Marlborough, MA · Owner: Main Street Group Bancshares MHC
$1.7B
total assets, June 30, 2026
$1.7B
total assets, June 30, 2026
Main Street Bank is a state savings bank based in Marlborough, MA, owned by Main Street Group Bancshares MHC. As of June 30, 2026 it held $1.7 billion in assets and $1.4 billion in deposits; assets were down 1.4% from a year before. It has 6 branches.
Updated Oct 11, 2026 · numbers as of June 30, 2026
Total assets
$1.7B
-1.4% in a year · +3.3% in a quarter
Deposits
$1.4B
-2.4% in a year · +3.6% in a quarter
Loans
$1.3B
-5.1% in a year · -2.0% in a quarter
Profit so far
$5.2M
Jan 1 to Jun 30, 2026 · -4.9% in a year
Capital ratio
12.04%
+0.97 pts in a year
Return on assets
0.63%
-0.04 pts in a year
Facts
- Type
- State savings bank
- Head office
- 81 Granger Blvd, Marlborough, MA, 01752
- County
- Middlesex
- Holding company
- Main Street Group Bancshares MHC
- Established
- Apr 3, 1860
- Employees
- 161
- Branches
- 6
- Website
- www.bankmainstreet.com
- Id
- b90235
Quarter by quarter
December 31, 1985 to June 30, 2026
Assets, deposits and loans
Each quarter end, US dollars
Profit by quarter
Net income of each quarter, the last 12
Ratios
Percent. Return on assets and net interest margin are yearly rates.
Branches
6 offices as of June 30, 2026, holding $1.4 billion in deposits
Branch map
Every branch, sized by its deposits
| State | Branches | Deposits | Share |
|---|---|---|---|
| Massachusetts | 6 | $1.4B | 100.0% |
| Largest branches | Place | Deposits |
|---|---|---|
| Main Street Bank (main office) | Marlborough, MA | $730M |
| North Middlesex Svgs Br | Ayer, MA | $244M |
| Pepperell Branch | Pepperell, MA | $127M |
| Hudson Branch | Hudson, MA | $114M |
| Northborough Branch | Northborough, MA | $91.9M |
| Southborough Branch | Southborough, MA | $88.1M |
Related pages
Questions and answers
How big is Main Street Bank?
$1.7 billion in total assets and $1.4 billion in deposits as of June 30, 2026, with assets down 1.4% from a year before. Its loans were $1.3 billion.
How many branches does Main Street Bank have?
6 branches in Massachusetts as of June 30, 2026.
Is Main Street Bank profitable?
Yes: it earned $5.17 million from January 1 to June 30, 2026 (down 4.9% from the same months a year before). Its return on assets was 0.63% a year; about 1% is typical.
Who owns Main Street Bank?
Main Street Bank is owned by Main Street Group Bancshares MHC, its holding company.
Official public data from the reports every insured bank files each quarter. Profit so far runs from January 1 to the quarter end. Branch deposits are counted once a year, as of June 30. New quarters appear about two months after the quarter ends.