Comparable stake leader
Ejnar A. Knudsen III
SEC ownership of IMMUCELL CORP /DE/
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000811641.
Disclosed value leader
Jonathan E. Rothschild
Comparable rows
1/42
Latest evidence
15 Apr 2026
- Public ticker
- ICCC on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Ejnar A. Knudsen III
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
1 of 42
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Ejnar A. Knudsen III
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
15 Apr 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000811641
- Issuer location
- Portland, ME
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 IMMUCELL CORP /DE/ (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
Ejnar A. Knudsen III
Disclosed value leader
Jonathan E. Rothschild
Comparable rows
1/42
Latest evidence
15 Apr 2026
13D/G
3/4/5
13F
Lead comparable stake: 9.2%
41 rows are not safely comparable across share classes.
13D/G row: Ejnar A. Knudsen III
Showing 1-8 of 42 holder rows.
Quick read
Ejnar A. Knudsen III leads the comparable SEC ownership view at 9.2%.
1 of 42 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 Ejnar A. Knudsen III's linked filing trail.
Comparable ownership
Top 1
Ejnar A. Knudsen III
9.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 42 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Ejnar A. Knudsen III |
13D/G
|
9.2%
|
—
832,790 shares
|
$0 | 19 Nov 2025 |
| Jonathan E. Rothschild |
3/4/5
Director
|
—
class O/S missing
|
$4,302,205
514,003 shares
|
— | 03 Jun 2021 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$1,647,870
260,327 shares
|
— | 31 Mar 2026 |
| MORGAN STANLEY |
13F
Company
|
—
class O/S missing
|
$1,403,462
221,716 shares
|
— | 31 Mar 2026 |
| Joseph H. Crabb |
3/4/5
Former VP and CSO
|
—
class O/S missing
|
$1,195,613
142,845 shares
|
— | 09 Mar 2022 |
| Michael F. Brigham |
3/4/5
Director
|
—
mixed-class rows
|
$1,139,541
206,700 shares
mixed-class rows
|
— | 20 Mar 2026 |
| Boekhorst Paul Francis Olivier Te |
3/4/5
President and CEO, Director
|
—
mixed-class rows
|
$970,146
119,238 shares
mixed-class rows
|
+$80,117 | 27 Jan 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
—
class O/S missing
|
$960,824
151,789 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: +$95,671.
Buys
$95,671
Insiders: 2
Sells
$0
Insiders: 0
Net
+$95,671
Shares: +19,081
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 19,081
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 | 19,081 | 0 | $95,671 | $0 | +$95,671 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-16 of 16 reporting-owner rows connected to IMMUCELL CORP /DE/. Open a relationship link for the CIK-to-CIK filing trail.
Rows
16
Largest Forms 3/4/5 holder
Jonathan E. Rothschild
Net 12M change
+$95,671
Latest report
15 Apr 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jonathan E. Rothschild | Director | $4,302,205 | Mixed | 03 Jun 2021 | ||
| Joseph H. Crabb | Former VP and CSO | $1,195,613 | Mixed | 09 Mar 2022 | ||
| Michael F. Brigham | Director | $1,139,541 | Mixed | 20 Mar 2026 | ||
| Boekhorst Paul Francis Olivier Te | President and CEO, Director | $970,146 | +$80,117 | +9% | Mixed | 27 Jan 2026 |
| David Scott Tomsche | Director | $625,795 | +$15,554 | +2.5% | Mixed | 15 Apr 2026 |
| Timothy C. Fiori | Chief Financial Officer, Director | $164,700 | Mixed | 27 Jan 2026 | ||
| Gloria F. Basse | Director | $52,979 | Mixed | 15 Apr 2026 | ||
| Bryan K. Gathagan | Director | $42,320 | Mixed | 12 Jun 2025 | ||
| Rosgen Steven T. | Director | $36,000 | Mixed | 16 Apr 2025 | ||
| Paul R. Wainman | Director | $36,000 | Mixed | 15 Apr 2026 | ||
| David Cunningham | Director | $36,000 | Mixed | 15 Dec 2022 | ||
| Elizabeth Luttrell Williams | VP of Manufacturing Operations | $8,150 | Mixed | 31 Jan 2022 | ||
| Kathy Turner V | Director | Mixed | 15 Apr 2026 | |||
| Bobbi Jo Brockmann | VP of Sales and Marketing, Director | Mixed | 27 Jan 2026 | |||
| Gilles Guillemette | Director | Mixed | 15 Apr 2026 | |||
| Anthony DiMarco | Director | Mixed | 15 Apr 2026 |
Recent insider transactions for IMMUCELL CORP /DE/
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Kathy Turner V | ICCC | Non Qualified Stock Options (Right to buy) | Award | 17,899 | 17,899 | 15 Apr 2026 | Direct | |||
| David Scott Tomsche | ICCC | Non Qualified Stock Options (Right to buy) | Award | 11,933 | 11,933 | 15 Apr 2026 | Direct | |||
| Gloria F. Basse | ICCC | Non Qualified Stock Options (Right to buy) | Award | 11,933 | 11,933 | 15 Apr 2026 | Direct | |||
| Paul R. Wainman | ICCC | Non Qualified Stock Options (Right to buy) | Award | 11,933 | 11,933 | 15 Apr 2026 | Direct | |||
| Michael F. Brigham | ICCC | Common Stock, par value $.01 per share | Tax liability | -10.5% | -24,052 | 205,700 | 20 Mar 2026 | Direct | ||
| Michael F. Brigham | ICCC | Common Stock, par value $.01 per share | Options Exercise | 12.2% | 25,000 | 229,752 | 20 Mar 2026 | Direct | ||
| Michael F. Brigham | ICCC | Stock Options (right to buy) | Options Exercise | -100% | -25,000 | 0 | 20 Mar 2026 | Direct | ||
| Boekhorst Paul Francis Olivier Te | ICCC | Stock Options (right to buy) | Award | 109,500 | 109,500 | 27 Jan 2026 | Direct | |||
| Timothy C. Fiori | ICCC | Stock Options (right to buy) | Award | 120,000 | 120,000 | 27 Jan 2026 | Direct | |||
| Bobbi Jo Brockmann | ICCC | Stock Options (right to buy) | Award | 100,000 | 100,000 | 27 Jan 2026 | Direct | |||
| Boekhorst Paul Francis Olivier Te | ICCC | Common Stock $0.10 par value per share | Purchase | 33.3% | $13,376 | $5.50 | 2,432 | 9,738 | 04 Dec 2025 | Direct |
| Boekhorst Paul Francis Olivier Te | ICCC | Common Stock $0.10 par value per share | Purchase | 97% | $18,152 | $5.04 | 3,598 | 7,306 | 03 Dec 2025 | Direct |
| Boekhorst Paul Francis Olivier Te | ICCC | Common Stock $0.10 par value per share | Purchase | 163.9% | $30,536 | $5.02 | 6,077 | 9,785 | 03 Dec 2025 | Direct |
| Boekhorst Paul Francis Olivier Te | ICCC | Common Stock $0.10 par value per share | Purchase | $18,053 | $4.87 | 3,708 | 3,708 | 02 Dec 2025 | Direct | |
| David Scott Tomsche | ICCC | Common Stock $0.10 par value per share | Purchase | 52.6% | $7,781 | $4.76 | 1,633 | 4,740 | 25 Nov 2025 | By Spouse |
| David Scott Tomsche | ICCC | Common Stock $0.10 par value per share | Purchase | 3.2% | $7,773 | $4.76 | 1,633 | 52,720 | 25 Nov 2025 | Direct |
| Boekhorst Paul Francis Olivier Te | ICCC | Stock Options (right to buy) | Award | 97.8% | 74,277 | 150,260 | 07 Nov 2025 | Direct |
* marks a reported price that did not pass the local price check.