Comparable stake leader
Maura Ellen Sullivan
SEC ownership of ECB Bancorp, Inc. /MD/
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001914605.
Disclosed value leader
ALLIANCEBERNSTEIN L.P.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- ECBK on Nasdaq
- Parsed ownership sources
-
3/4/5 and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Maura Ellen Sullivan
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001914605
- Issuer location
- Everett, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ECB Bancorp, Inc. /MD/ (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
Maura Ellen Sullivan
Disclosed value leader
ALLIANCEBERNSTEIN L.P.
Comparable rows
50/50
Latest evidence
31 Mar 2026
3/4/5
13F
Lead comparable stake: 0.08%
Showing 1-8 of 50 holder rows.
Quick read
Maura Ellen Sullivan leads the comparable SEC ownership view at 0.08%.
50 of 50 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 Maura Ellen Sullivan's linked filing trail.
Comparable ownership
Top 5
Maura Ellen Sullivan
0.08%
ALLIANCEBERNSTEIN L.P.
8.6%
BlackRock, Inc.
4.3%
VANGUARD CAPITAL MANAGEMENT LLC
4.2%
GEODE CAPITAL MANAGEMENT, LLC
1.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Maura Ellen Sullivan |
3/4/5
Director
|
0.08%
|
$125,184
6,850 shares
|
+$99,677 | 09 Feb 2026 |
| ALLIANCEBERNSTEIN L.P. |
13F
Company
|
8.6%
|
$13,690,782
787,279 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
4.3%
|
$6,602,427
394,646 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
4.2%
|
$6,423,015
383,922 shares
|
— | 31 Mar 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
1.7%
|
$2,580,990
154,247 shares
|
— | 31 Mar 2026 |
| Sachetta, LLC |
13F
Company
|
1.3%
|
$1,988,411
118,853 shares
|
— | 31 Mar 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
0.96%
|
$1,469,998
87,866 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13F
Company
|
0.87%
|
$1,331,574
79,592 shares
|
— | 31 Mar 2026 |
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
Net insider flow leans to buying over the last 12 months. Net value: +$120,205.
Buys
$120,205
Insiders: 3
Sells
$0
Insiders: 0
Net
+$120,205
Shares: +6,990
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 6,990
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 40 | 0 | $716 | $0 | +$716 |
| 3-6 | 2,200 | 0 | $40,700 | $0 | +$40,700 |
| 6-9 | 3,500 | 0 | $58,977 | $0 | +$58,977 |
| 9-12 | 1,250 | 0 | $19,812 | $0 | +$19,812 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-11 of 11 reporting-owner rows connected to ECB Bancorp, Inc. /MD/. Open a relationship link for the CIK-to-CIK filing trail.
Rows
11
Largest Forms 3/4/5 holder
Richard J. O'Neil Jr.
Net 12M change
+$120,206
Latest report
30 Apr 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Richard J. O'Neil Jr. | President and CEO, Director | $4,809,656 | +$19,813 | +0.41% | Mixed | 16 Sep 2025 |
| Brandon Lavertu | Cfo | $3,209,815 | +$716 | +0.02% | Mixed | 30 Apr 2026 |
| John A. Citrano | EVP and COO | $1,858,740 | Mixed | 12 Feb 2025 | ||
| Joseph Sachetta | Director | $1,202,778 | Mixed | 18 Dec 2024 | ||
| John Migliozzi | EVP and CLO | $922,556 | Mixed | 31 Oct 2023 | ||
| Dennis J. Leonard | Director, Chairman of the Board | $677,687 | Mixed | 08 Sep 2023 | ||
| Elizabeth P. Jones | Director | $512,837 | Mixed | 08 Sep 2023 | ||
| Susan Sgroi | Director | $402,937 | Mixed | 08 Sep 2023 | ||
| Paul A. Delory | Director | $286,555 | Mixed | 03 May 2024 | ||
| Marjorie A. White | Director | $238,087 | Mixed | 08 Sep 2023 | ||
| Maura Ellen Sullivan | Director | $125,184 | +$99,677 | +391% | Mixed | 09 Feb 2026 |
Recent insider transactions for ECB Bancorp, Inc. /MD/
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Brandon Lavertu | ECBK | Common Stock | Purchase | 0.12% | $716 | $17.89 | 40 | 32,423 | 30 Apr 2026 | Direct |
| Maura Ellen Sullivan | ECBK | Common Stock | Purchase | 62.9% | $40,700 | $18.50 | 2,200 | 5,700 | 09 Feb 2026 | By Spouse |
| Maura Ellen Sullivan | ECBK | Common Stock | Award | 1,150 | 1,150 | 17 Dec 2025 | Direct | |||
| Maura Ellen Sullivan | ECBK | Common Stock | Purchase | 19.2% | $9,558 | $16.98 | 563 | 3,500 | 09 Dec 2025 | By Spouse |
| Maura Ellen Sullivan | ECBK | Common Stock | Purchase | $49,418 | $16.83 | 2,937 | 2,937 | 08 Dec 2025 | By Spouse | |
| Richard J. O'Neil Jr. | ECBK | Common Stock | Purchase | 4.79% | $19,812 | $15.85 | 1,250 | 27,355 | 16 Sep 2025 | By IRA |
* marks a reported price that did not pass the local price check.