# EDGAR Filing Document

**Accession Number:** 0001257324
**File Stem:** 0001012975-26-000274
**Filing Date:** 2026-3
**Character Count:** 12014
**Document Hash:** 2ba4320479a5633d66afbd3709756566
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001012975-26-000274.hdr.sgml**: 20260327

**ACCESSION NUMBER**: 0001012975-26-000274

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260325

**FILED AS OF DATE**: 20260327

**DATE AS OF CHANGE**: 20260327

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ICAHN CARL C
- **CENTRAL INDEX KEY:** 0000921669
- **ORGANIZATION NAME:** CF
- **STATE OF INCORPORATION:** FL
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-12957
- **FILM NUMBER:** 26809561

**BUSINESS ADDRESS:**
- **STREET 1:** C/O ICAHN ENTERPRISES L.P.
- **STREET 2:** 16690 COLLINS AVE., PH-1
- **CITY:** SUNNY ISLES BEACH
- **STATE:** FL
- **ZIP:** 33160
- **BUSINESS PHONE:** 305-422-4145

**MAIL ADDRESS:**
- **STREET 1:** C/O ICAHN ENTERPRISES L.P.
- **STREET 2:** 16690 COLLINS AVE., PH-1
- **CITY:** SUNNY ISLES BEACH
- **STATE:** FL
- **ZIP:** 33160

**FORMER NAME:**
- **FORMER CONFORMED NAME:** ICAHN CARL C ET AL
- **DATE OF NAME CHANGE:** 19950612
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ICAHN ENTERPRISES G.P. INC.
- **CENTRAL INDEX KEY:** 0001257324

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-12957
- **FILM NUMBER:** 26809559

**BUSINESS ADDRESS:**
- **STREET 1:** 16690 COLLINS AVE.
- **STREET 2:** PH
- **CITY:** SUNNY ISLES
- **STATE:** FL
- **ZIP:** 33160
- **BUSINESS PHONE:** 305-422-4145

**MAIL ADDRESS:**
- **STREET 1:** 16690 COLLINS AVE.
- **STREET 2:** PH
- **CITY:** SUNNY ISLES
- **STATE:** FL
- **ZIP:** 33160

**FORMER NAME:**
- **FORMER CONFORMED NAME:** AMERICAN PROPERTY INVESTORS INC
- **DATE OF NAME CHANGE:** 20030729
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ICAHN ENTERPRISES HOLDINGS L.P.
- **CENTRAL INDEX KEY:** 0001034563
- **STANDARD INDUSTRIAL CLASSIFICATION:** MOTOR VEHICLE PARTS & ACCESSORIES [3714]
- **ORGANIZATION NAME:** 04 Manufacturing
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-12957
- **FILM NUMBER:** 26809560

**BUSINESS ADDRESS:**
- **STREET 1:** 16690 COLLINS AVE,
- **STREET 2:** PH
- **CITY:** SUNNY ISLES
- **STATE:** FL
- **ZIP:** 33160
- **BUSINESS PHONE:** (305) 422-4000

**MAIL ADDRESS:**
- **STREET 1:** 16690 COLLINS AVE,
- **STREET 2:** PH
- **CITY:** SUNNY ISLES
- **STATE:** FL
- **ZIP:** 33160

**FORMER NAME:**
- **FORMER CONFORMED NAME:** AMERICAN REAL ESTATE HOLDINGS L P
- **DATE OF NAME CHANGE:** 19980311
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Viskase Holdings, Inc.
- **CENTRAL INDEX KEY:** 0000727510
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 222372868
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 333 EAST BUTTERFIELD ROAD, SUITE 400
- **CITY:** LOMBARD
- **STATE:** IL
- **ZIP:** 60148
- **BUSINESS PHONE:** (630) 874-0700

**MAIL ADDRESS:**
- **STREET 1:** 333 EAST BUTTERFIELD ROAD, SUITE 400
- **CITY:** LOMBARD
- **STATE:** IL
- **ZIP:** 60148

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ENZON PHARMACEUTICALS, INC.
- **DATE OF NAME CHANGE:** 20160309

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ENZON PHARMACEUTICALS INC
- **DATE OF NAME CHANGE:** 20060324

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ENZON PHARMACEUTICALS  INC
- **DATE OF NAME CHANGE:** 20021211

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ICAHN CARL C<br><sub>(Last) (First) (Middle)</sub><br>C/O ICAHN ASSOCIATES HOLDING LLC<br>16690 COLLINS AVENUE, PH-1<br><sub>(Street)</sub><br>SUNNY ISLES BEACH, FL 33160<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-25 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Viskase Holdings, Inc. [ ENZND ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ICAHN ENTERPRISES HOLDINGS L.P.<br><sub>(Last) (First) (Middle)</sub><br>16690 COLLINS AVENUE, PH-1<br><sub>(Street)</sub><br>SUNNY ISLES BEACH, FL 33160<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-25 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Viskase Holdings, Inc. [ ENZND ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ICAHN ENTERPRISES G.P. INC.<br><sub>(Last) (First) (Middle)</sub><br>16690 COLLINS AVENUE, SUITE PH-1<br><sub>(Street)</sub><br>SUNNY ISLES BEACH, FL 33160<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-25 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Viskase Holdings, Inc. [ ENZND ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Preferred Stock | 2026-03-25 |  | D<sup>(1)</sup> |  | 39277 | D | <sup>(1)</sup> | 0 | I | Please see footnotes<sup>(4)(5)(6)</sup> |
| Common Stock | 2026-03-25 |  | A<sup>(1)</sup> |  | 5658396 | A | <sup>(1)</sup> | 6018962<sup>(2)</sup> | I | Please see footnotes<sup>(4)(5)(6)</sup> |
| Common Stock | 2026-03-26 |  | A<sup>(3)</sup> |  | 7407489 | A | <sup>(3)</sup> | 13426451 | I | Please see footnotes<sup>(4)(5)(6)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Disposed of in exchange for 5,658,396 shares of common stock of the Issuer in connection with the merger of the Issuer and Viskase Companies, Inc. (the "Merger"). Following the closing of the Merger on March 26, 2026, the combined company was renamed "Viskase Holdings, Inc."

(2) Reflects the Issuer's 1-for-100 reverse stock split effected on March 25, 2026.

(3) Received in exchange for 150,810,078 shares of Viskase Companies, Inc. in connection with the Merger.

(4) This Form 4 is being filed by, and on behalf of, Mr. Carl C. Icahn, Icahn Enterprises Holdings L.P. ("Icahn Enterprises Holdings") and Icahn Enterprises G.P. Inc. ("Icahn Enterprises GP" and, collectively with Mr. Icahn and Icahn Enterprises Holdings, the "Reporting Persons"). Shares held directly by American Entertainment Properties Corp ("AEP").

(5) AEPC Holdings LLC owns 100% of the equity of AEP. Icahn Enterprises Holdings owns a 100% interest in AEPC Holdings LLC. Icahn Enterprises L.P. owns a 99% limited partner interest in Icahn Enterprises Holdings. Carl C. Icahn is the indirect holder of approximately 87% of the issued and outstanding depositary units representing limited partnership interests in Icahn Enterprises L.P. Icahn Enterprises GP is the general partner of and owns a 1% general partner interest in each of Icahn Enterprises Holdings and Icahn Enterprises L.P. Icahn Enterprises GP is 100% owned by Beckton Corp ("Beckton"). Beckton is 100% owned by Mr. Icahn.

(6) Each of AEP, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn disclaims beneficial ownership of the Issuer's shares of common stock except to the extent of his or its pecuniary interest therein, if any.

**Signature:** /s/ Carl C. Icahn  
**Date:** 2026-03-27

**Signature:** /s/ Ted Papapostolou, for Icahn Enterprises Holdings L.P., By: Ted Papapostolou, its Chief Financial Officer and Secretary  
**Date:** 2026-03-27

**Signature:** /s/ Ted Papapostolou, for Icahn Enterprises G.P. Inc., By: Ted Papapostolou, its Chief Financial Officer and Secretary  
**Date:** 2026-03-27

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**