13D Filings
ENZON PHARMACEUTICALS, INC.
ENZN
Amendment
Ownership

48.60%

Total Shares

36,056,636

Issuer CIK

727510

CUSIP

293904108

Event Date

Jan 29, 2026

Accepted

Jan 30, 2026, 06:02 PM

Reporting Persons (3)
Joint Filing

This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.

NameType% of ClassAggregateSole VotingShared Voting
CARL C ICAHN
Individual
48.60%36,056,636036,056,636
ICAHN ENTERPRISES HOLDINGS L.P.
Partnership
48.60%36,056,636036,056,636
ICAHN ENTERPRISES G.P. INC.
CO
48.60%36,056,636036,056,636
Disclosure Items (3)

Security Title

Common Stock, par value $0.01 per share

Issuer Name

ENZON PHARMACEUTICALS, INC.

Issuer Address

20 Commerce Drive (Suite 135), Cranford, NJ, 07016

Item 4 of the Original 13D is hereby amended and supplemented as follows: The disclosure set forth in Item 6 of this Schedule 13D is incorporated herein by reference.

Item 6 of the Original 13D is hereby amended and supplemented as follows: Pursuant to the previously disclosed IEH Support Agreement by and between Icahn Enterprises Holdings and certain of its affiliates, the Issuer and Viskase, on January 30, 2026, affiliates of Icahn Enterprises Holdings delivered to the Issuer a wirtten consent with respect to all of the issued and outstanding Shares held by such affiliates approving the Merger and the amendment to the Issuer's certificate of incorporation.

ENZON PHARMACEUTICALS, INC. — Schedule 13D | 13D Filings