Comparable stake leader
Greybrook Health Inc.
SEC ownership of Greenbrook TMS Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001735948.
Disclosed value leader
—
Comparable rows
0/7
Latest evidence
01 Apr 2024
- Parsed ownership sources
-
3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Greybrook Health Inc.
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
01 Apr 2024
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001735948
- Issuer location
- Toronto, Ontario, Canada
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 Greenbrook TMS Inc. (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
Greybrook Health Inc.
Disclosed value leader
—
Comparable rows
0/7
Latest evidence
01 Apr 2024
3/4/5
Some rows are evidence-backed but not safely comparable across classes.
7 rows are not safely comparable across share classes.
Quick read
SEC ownership evidence is available, but the rows are not safely comparable across share classes.
0 of 7 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 Greybrook Health Inc.'s linked filing trail.
Detailed SEC evidence table Showing 1-7 of 7 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Greybrook Health Inc. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
7,000,424 shares
|
— | 01 Jan 2024 |
| Madryn Asset Management, LP |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
6,363,636 shares
|
— | 01 Jan 2024 |
| William P. Leonard |
3/4/5
President and CEO, Director
|
—
class O/S missing
|
—
832,500 shares
|
— | 01 Jan 2024 |
| Peter Casimir Willett |
3/4/5
Chief Financial Officer
|
—
class O/S missing
|
—
300,000 shares
|
— | 01 Apr 2024 |
| Andrew Crish |
3/4/5
Chief Operating Officer
|
—
class O/S missing
|
—
250,000 shares
|
— | 01 Apr 2024 |
| Frank Tworecke |
3/4/5
Director
|
—
class O/S missing
|
—
40,000 shares
|
— | 01 Jan 2024 |
| Colleen Rae Campbell |
3/4/5
Director
|
—
class O/S missing
|
—
5,000 shares
|
— | 01 Jan 2024 |
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 03 Jul 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 1-13 of 13 reporting-owner rows connected to Greenbrook TMS Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Largest Forms 3/4/5 holder
William P. Leonard
Net 12M change
$0
Latest report
01 Apr 2024
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| William P. Leonard | President and CEO, Director | Mixed | 01 Jan 2024 | |||
| Andrew Crish | Chief Operating Officer | Mixed | 01 Apr 2024 | |||
| Juliana Elstad | Director | Mixed | 23 Jan 2024 | |||
| Madryn Asset Management, LP | 10%+ Owner | Mixed | 01 Jan 2024 | |||
| Frank Tworecke | Director | Mixed | 01 Jan 2024 | |||
| Colleen Rae Campbell | Director | Mixed | 01 Jan 2024 | |||
| Greybrook Health Inc. | 10%+ Owner | Mixed | 01 Jan 2024 | |||
| Brian P. Burke | Director | Mixed | 01 Jan 2024 | |||
| Geoffrey Garland Grammer | Chief Medical Officer | Mixed | 01 Jan 2024 | |||
| Peter Casimir Willett | Chief Financial Officer | Mixed | 01 Apr 2024 | |||
| Sasha Cucuz | Chairman, Director | Mixed | 01 Jan 2024 | |||
| Surindra Kaur Mann | Director | Mixed | 01 Jan 2024 | |||
| Elias Vamvakas | Director | Mixed | 01 Jan 2024 |
Recent insider transactions for Greenbrook TMS Inc.
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.