EXHIBIT 21.1

Subsidiaries*

•Vertex Energy Operating, LLC, a Texas Limited Liability Company (wholly-owned)(“Vertex Operating”)

•Vertex Refining LA, LLC, a Louisiana Limited Liability Company (wholly-owned by Vertex Operating)

•Vertex Recovery Management, LLC, a Texas Limited Liability Company (wholly-owned)(“Vertex Recovery”)

•Vertex Recovery Management LA, LLC, a Louisiana Limited Liability Company (51% owned by Vertex Recovery Management, LLC and 49% owned by Industrial Pipe, Inc.)

•Vertex Splitter Corporation, a Delaware corporation (wholly-owned)

•Vertex Refining Myrtle Grove LLC, a Delaware Limited Liability Company wholly-owned by Vertex Operating

•Vertex Refining Texas LLC, a Texas limited liability company wholly-owned by Vertex Operating

•Vertex Refining Alabama, LLC, a Texas limited liability company wholly-owned by Vertex Operating

•Vertex Marine Fuel Services LLC, a Delaware limited liability company wholly-owned by Vertex Operating

•Vertex Renewables LLC, a Delaware limited liability company wholly-owned by Vertex Operating

•Vertex Renewables Alabama LLC, a Delaware limited liability company wholly-owned by Vertex Renewables LLC

•HPRM LLC, a Delaware Limited Liability Company (wholly-owned by Vertex Operating)

•Crystal Energy, LLC ("Crystal") an Alabama Limited Liability Company (wholly-owned by Vertex Operating)

•Vertex Acquisition Sub, LLC, a Nevada Limited Liability Company (“Vertex Acquisition”) (wholly-owned by Vertex Operating)

Wholly-owned subsidiaries of Vertex Acquisition:

◦Cedar Marine Terminals, L.P., a Texas limited partnership

◦Crossroad Carriers, L.P., a Texas limited partnership

◦Vertex Recovery, L.P., a Texas limited partnership

◦H&H Oil, L.P., a Texas limited partnership, wholly owned by Crossroad Carriers, L.P.

* Pursuant to Item 601(b)(21)(ii) of Regulation S-K, the names of other subsidiaries of Vertex Energy, Inc. are omitted because, considered in the aggregate, they would not constitute a significant subsidiary as of the end of the year covered by this report. Inclusion in this list is not, however, a representation that the listed subsidiary is a “significant subsidiary.” The list above is as of March 6, 2024.