Comparable stake leader
Steven D. Heinemann
SEC ownership of NETWORK-1 TECHNOLOGIES, INC.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001065078.
Disclosed value leader
Corey M. Horowitz
Comparable rows
28/33
Latest evidence
31 Mar 2026
- Public ticker
- NTIP on NYSE
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Steven D. Heinemann
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
28 of 33
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Steven D. Heinemann
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001065078
- Issuer location
- New Canaan, CT
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of NETWORK-1 TECHNOLOGIES, 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
Steven D. Heinemann
Disclosed value leader
Corey M. Horowitz
Comparable rows
28/33
Latest evidence
31 Mar 2026
3/4/5
13D/G
13F
Lead comparable stake: 5.9%
5 rows are not safely comparable across share classes.
13D/G row: Steven D. Heinemann
Showing 1-8 of 33 holder rows.
Quick read
Steven D. Heinemann leads the comparable SEC ownership view at 5.9%.
28 of 33 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 Steven D. Heinemann's linked filing trail.
Comparable ownership
Top 5
Steven D. Heinemann
5.9%
CANNELL CAPITAL LLC
5%
Clayton Partners LLC
4.5%
Niv Harizman
1.5%
Allison C. Hoffman
0.59%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 33 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Steven D. Heinemann |
3/4/5
13D/G
10%+ Owner
|
5.9%
from 13D/G
|
$8,294,019
2,307,291 shares
|
— | 27 Jul 2021 |
| CANNELL CAPITAL LLC |
13F
13D/G
Company
|
5%
from 13D/G
|
$1,644,444
1,141,975 shares
|
— | 31 Mar 2026 |
| Clayton Partners LLC |
13F
13D/G
Company
|
4.5%
from 13D/G
|
$1,409,959
979,138 shares
|
— | 31 Mar 2026 |
| Niv Harizman |
3/4/5
Director
|
1.5%
|
$440,988
347,235 shares
|
— | 27 Feb 2026 |
| Allison C. Hoffman |
3/4/5
Director
|
0.59%
|
$172,413
135,759 shares
|
— | 27 Feb 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
2.2%
|
$722,785
501,934 shares
|
— | 31 Mar 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
2%
|
$664,479
461,444 shares
|
— | 31 Mar 2026 |
| SAYBROOK CAPITAL /NC |
13F
Company
|
1.4%
|
$475,262
330,043 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 22 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 1-8 of 8 reporting-owner rows connected to NETWORK-1 TECHNOLOGIES, INC.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
8
Largest Forms 3/4/5 holder
Corey M. Horowitz
Net 12M change
$0
Latest report
27 Feb 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Corey M. Horowitz | CEO and Chairman, Director, 10%+ Owner | $15,734,183 | Mixed | 22 Mar 2024 | ||
| Steven D. Heinemann | 10%+ Owner | $8,294,019 | Mixed | 27 Jul 2021 | ||
| Niv Harizman | Director | $440,988 | Mixed | 27 Feb 2026 | ||
| Emanuel R. Pearlman | Director | $310,981 | Mixed | 23 Feb 2024 | ||
| David C. Kahn | Chief Financial Officer, Director | $262,994 | Mixed | 29 Dec 2021 | ||
| Jonathan M. Greene | Executive VP & Secretary, Director | $215,474 | Mixed | 18 Feb 2026 | ||
| Allison C. Hoffman | Director | $172,413 | Mixed | 27 Feb 2026 | ||
| Robert Michael Mahan | Chief Financial Officer | $159,868 | Mixed | 18 Feb 2026 |
Recent insider transactions for NETWORK-1 TECHNOLOGIES, 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Niv Harizman | NTIP- | Common Stock, $.01 par value per share | Award | 4.51% | 15,000 | 347,235 | 27 Feb 2026 | Direct | ||
| Allison C. Hoffman | NTIP- | Common Stock, $.01 par value per share | Award | 12.4% | 15,000 | 135,759 | 27 Feb 2026 | Direct | ||
| Robert Michael Mahan | NTIP- | Restricted Stock Units | Award | 42.9% | 15,000 | 50,000 | 18 Feb 2026 | Direct | ||
| Jonathan M. Greene | NTIP- | Restricted Stock Units | Award | 200% | 25,000 | 37,500 | 18 Feb 2026 | Direct | ||
| Jonathan M. Greene | NTIP | Common Stock, $.01 par value per share | Tax liability | -2.08% | -2,674 | 126,119 | 08 Jan 2026 | Direct | ||
| Jonathan M. Greene | NTIP | Common Stock, $.01 par value per share | Award | 6.18% | 7,500 | 128,793 | 08 Jan 2026 | Direct | ||
| Jonathan M. Greene | NTIP | Restricted Stock Units | Options Exercise | -37.5% | -7,500 | 12,500 | 08 Jan 2026 | Direct | ||
| Jonathan M. Greene | NTIP | Common Stock, $.01 par value per share | Tax liability | -3.54% | -4,456 | 121,293 | 02 Jan 2026 | Direct | ||
| Jonathan M. Greene | NTIP | Common Stock, $.01 par value per share | Award | 11% | 12,500 | 125,749 | 02 Jan 2026 | Direct | ||
| Jonathan M. Greene | NTIP | Restricted Stock Units | Options Exercise | -38.5% | -12,500 | 20,000 | 02 Jan 2026 | Direct | ||
| Robert Michael Mahan | NTIP | Restricted Stock Units | Award | -50% | -35,000 | 35,000 | 22 Sep 2025 | Direct | ||
| Robert Michael Mahan | NTIP | Common Stock, $.01 par value per share | Award | 100% | 25,000 | 50,000 | 08 Sep 2025 | Direct | ||
| Robert Michael Mahan | NTIP | Restricted Stock Units | Options Exercise | -100% | -25,000 | 0 | 08 Sep 2025 | Direct |
* marks a reported price that did not pass the local price check.