IMMUCELL CORP ICCC
COM PAR · Common Stock · CUSIP 452525306
- SectorHealth care
- IndustryIn Vitro & In Vivo Diagnostic Substances
- HeadquartersPortland, ME
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 9.1m as of 2026-07-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $10.05.
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 27 |
| Q4 2022 | 27 |
| Q1 2023 | 31 |
| Q2 2023 | 32 |
| Q3 2023 | 31 |
| Q4 2023 | 29 |
| Q1 2024 | 26 |
| Q2 2024 | 29 |
| Q3 2024 | 23 |
| Q4 2024 | 28 |
| Q1 2025 | 28 |
| Q2 2025 | 26 |
| Q3 2025 | 27 |
| Q4 2025 | 26 |
| Q1 2026 | 27 |
| Q2 2026 | 31 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 7 | 10 |
| Q4 2024 | 9 | 8 |
| Q1 2025 | 7 | 7 |
| Q2 2025 | 10 | 5 |
| Q3 2025 | 8 | 9 |
| Q4 2025 | 11 | 9 |
| Q1 2026 | 9 | 6 |
| Q2 2026 | 14 | 10 |
Biggest buyers
| RENAISSANCE TECHNOLOGIES LLC | Added | +19.3k |
| JANE STREET GROUP, LLC | New | +15.8k |
| Quadrature Capital Ltd | New | +15.4k |
| MORGAN STANLEY | Added | +12.2k |
| MERCER GLOBAL ADVISORS INC /ADV | New | +12.0k |
| VANGUARD CAPITAL MANAGEMENT LLC | Added | +7.8k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +6.5k |
| CITADEL ADVISORS LLC | Added | +4.8k |
| BlackRock, Inc. | Added | +4.7k |
| DIMENSIONAL FUND ADVISORS LP | Added | +2.4k |
Biggest sellers
| Bleichroeder LP | Reduced | -51.6k |
| Militia Capital Management LLC | Reduced | -44.0k |
| NORTHERN TRUST CORP | Reduced | -26.9k |
| SHUFRO ROSE & CO LLC | Reduced | -25.0k |
| Essex Financial Services, Inc. | Sold out | -11.0k |
| Steadtrust LLC | Reduced | -9.0k |
| VANGUARD FIDUCIARY TRUST CO | Reduced | -4.9k |
| HARBOUR INVESTMENTS, INC. | Sold out | -250 |
| Advisory Services Network, LLC | Sold out | -200 |
| UBS Group AG | Reduced | -113 |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
Knudsen Ejnar A III
13D · may seek influence
filed 2025-11-20
Stated purposeAll shares held by the Reporting Person are held by the Reporting Person for investment purposes. The Reporting Person currently has no plans or proposals that relate to, or would result in, any of the matters described in subsections (a) through (j) of Item 4 of the instructions to Schedule 13D. Full filing |
9.2% |
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 1 | $6.3k | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 2 | $47.1k | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 1 | $76.0k | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-06-18 | te Boekhorst Paul Francis Olivier President and CEO, director | Bought | $76.0k8.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 268.1k $2.7m | Added +7.8k |
| MORGAN STANLEY 0.00% of their portfolio | 233.9k $2.4m | Added +12.2k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 171.1k $1.7m | Added +19.3k |
| Cresset Asset Management, LLC 0.00% of their portfolio | 135.3k $1.4m | Unchanged |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 72.3k $726.5k | Added +6.5k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 58.5k $587.4k | Added +2.4k |
| Bleichroeder LP 0.09% of their portfolio | 50.0k $502.5k | Reduced -51.6k |
| Steadtrust LLC 0.23% of their portfolio | 45.4k $456.0k | Reduced -9.0k |
| Mesirow Financial Investment Management, Inc. 0.01% of their portfolio | 42.5k $426.9k | Unchanged |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 40.5k $407.1k | Added +4.8k |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 37.8k $379.5k | Reduced -4.9k |
| Strategic Financial Services, Inc. 0.02% of their portfolio | 37.0k $371.9k | Unchanged |
| HighTower Advisors, LLC 0.00% of their portfolio | 24.4k $244.8k | Unchanged |
| BlackRock, Inc. 0.00% of their portfolio | 22.9k $229.7k | Added +4.7k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 15.8k $158.3k | New |
| Quadrature Capital Ltd 0.00% of their portfolio | 15.4k $154.9k | New |
| NORTHERN TRUST CORP 0.00% of their portfolio | 14.7k $147.9k | Reduced -26.9k |
| MERCER GLOBAL ADVISORS INC /ADV 0.00% of their portfolio | 12.0k $120.6k | New |
| BAILARD, INC. 0.00% of their portfolio | 10.1k $101.5k | Unchanged |
| SHUFRO ROSE & CO LLC 0.01% of their portfolio | 10.0k $100.5k | Reduced -25.0k |
| Militia Capital Management LLC 0.02% of their portfolio | 10.0k $100.5k | Reduced -44.0k |
| HM PAYSON & CO 0.00% of their portfolio | 4.0k $40.2k | Unchanged |
| UBS Group AG 0.00% of their portfolio | 1.0k $10.1k | Reduced -113 |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 391 $3.9k | Unchanged |
| FMR LLC 0.00% of their portfolio | 160 $1.6k | New |
| Capital Advisors, Ltd. LLC 0.00% of their portfolio | 98 $1.0k | Unchanged |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 32 $322 | New |
| BARCLAYS PLC 0.00% of their portfolio | 30 $302 | New |
| JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio | 19 $186 | Unchanged |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 5 $50 | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 1 $7 | Unchanged |