Comparable stake leader
TOWERVIEW LLC
SEC ownership of Castor Maritime Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001720161.
Disclosed value leader
TOWERVIEW LLC
Comparable rows
0/20
Latest evidence
31 Mar 2026
- Public ticker
- CTRM on Nasdaq
- Parsed ownership sources
-
13F and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
TOWERVIEW LLC
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001720161
- Issuer location
- Limassol, Cyprus
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 Castor Maritime 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
TOWERVIEW LLC
Disclosed value leader
TOWERVIEW LLC
Comparable rows
0/20
Latest evidence
31 Mar 2026
13F
3/4/5
Highest disclosed value: $444,000
20 rows are not safely comparable across share classes.
Showing 1-8 of 20 holder rows.
Quick read
TOWERVIEW LLC has the largest disclosed position value at $444K.
0 of 20 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 TOWERVIEW LLC's linked filing trail.
Disclosed position value
Top 5
TOWERVIEW LLC
$444K
RENAISSANCE TECHNOLOGIES LLC
$136.7K
GOLDMAN SACHS GROUP INC
$39K
Apriem Advisors
$35.2K
Petros Panagiotis Panagiotidis
$23.7K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 20 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| TOWERVIEW LLC |
13F
Company
|
—
class O/S missing
|
$444,000
240,000 shares
|
— | 31 Mar 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
—
class O/S missing
|
$136,658
73,869 shares
|
— | 31 Mar 2026 |
| GOLDMAN SACHS GROUP INC |
13F
Company
|
—
class O/S missing
|
$39,000
21,081 shares
|
— | 31 Mar 2026 |
| Apriem Advisors |
13F
Company
|
—
class O/S missing
|
$35,150
19,000 shares
|
— | 31 Mar 2026 |
| Petros Panagiotis Panagiotidis |
3/4/5
Chairman, Chief Executive Officer and Chief Financial Officer, Director
|
—
mixed-class rows
|
$23,716
23,240 shares
mixed-class rows
|
— | 18 Mar 2026 |
| Centiva Capital, LP |
13F
Company
|
—
class O/S missing
|
$20,515
11,089 shares
|
— | 31 Mar 2026 |
| SIMPLEX TRADING, LLC |
13F
Company
|
—
class O/S missing
|
$10,874
5,878 shares
|
— | 31 Mar 2026 |
| UBS Group AG |
13F
Company
|
—
class O/S missing
|
$4,120
2,227 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
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 07 Aug 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 1-3 of 3 reporting-owner rows connected to Castor Maritime Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
3
Largest Forms 3/4/5 holder
Petros Panagiotis Panagiotidis
Net 12M change
$0
Latest report
18 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Petros Panagiotis Panagiotidis | Chairman, Chief Executive Officer and Chief Financial Officer, Director | $23,716 | Mixed | 18 Mar 2026 | ||
| Angelos Rounick Platanias | Director | Mixed | 18 Mar 2026 | |||
| Dionysios Makris | Director | Mixed | 18 Mar 2026 |
Recent insider transactions for Castor Maritime 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Petros Panagiotis Panagiotidis | CTRM | Series B Preferred Shares | 0 | 12,000 | 18 Mar 2026 | By Thalassa Investment Co. S.A. | ||||
| Petros Panagiotis Panagiotidis | CTRM | Common Shares | 0 | 11,240 | 18 Mar 2026 | By Thalassa Investment Co. S.A. |
* marks a reported price that did not pass the local price check.