Comparable stake leader
Thomas J. Fontaine
SEC ownership of CAMBRIDGE BANCORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000711772.
Disclosed value leader
Thomas J. Fontaine
Comparable rows
0/6
Latest evidence
28 Apr 2023
- Parsed ownership sources
- 3/4/5
- Largest SEC-reported holder
- Thomas J. Fontaine
- Latest parsed ownership date
- 28 Apr 2023
- Issuer CIK
- 0000711772
- Issuer location
- Cambridge, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of CAMBRIDGE BANCORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Thomas J. Fontaine
Disclosed value leader
Thomas J. Fontaine
Comparable rows
0/6
Latest evidence
28 Apr 2023
3/4/5
Highest disclosed value: $1,687,847
6 rows are not safely comparable across share classes.
Quick read
Thomas J. Fontaine has the largest disclosed position value at $1.69M.
0 of 6 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Thomas J. Fontaine's linked filing trail.
Disclosed position value
Top 5
Thomas J. Fontaine
$1.69M
Jennifer Pline
$852.2K
Michael Carotenuto
$812K
Martin B. Millane
$781.2K
Edward F. Jankowski
$205.1K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 6 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Thomas J. Fontaine |
3/4/5
Chief Banking Officer, Director
|
—
class O/S missing
|
$1,687,847
25,072 shares
|
— | 31 Dec 2022 |
| Jennifer Pline |
3/4/5
EVP / Head of Wealth Mgmt
|
—
class O/S missing
|
$852,204
12,659 shares
|
— | 09 Mar 2023 |
| Michael Carotenuto |
3/4/5
SVP / CFO
|
—
class O/S missing
|
$812,014
12,062 shares
|
— | 28 Apr 2023 |
| Martin B. Millane |
3/4/5
EVP / Chief Lending Off
|
—
class O/S missing
|
$781,182
11,604 shares
|
— | 15 Feb 2023 |
| Edward F. Jankowski |
3/4/5
Director
|
—
class O/S missing
|
$205,057
3,046 shares
|
— | 17 May 2021 |
| Jennifer Willis |
3/4/5
SVP / CMO
|
—
class O/S missing
|
$109,597
1,628 shares
|
— | 30 Jul 2021 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 07 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 31 reporting-owner rows connected to CAMBRIDGE BANCORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
31
Largest Forms 3/4/5 holder
Thomas J. Fontaine
Net 12M change
$0
Latest report
12 Jul 2024
Recent insider transactions for CAMBRIDGE BANCORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.