Enclosure No. 6 - Tax Exemption Certificate.pdf

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Request for Proposal: ALCF Artemis Compute Cluster
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This document is a Taxpayer Notification letter from the Illinois Department of Revenue confirming the issuance of a Sales Tax Exemption Certificate to UChicago Argonne LLC (Argonne National Laboratory). The certificate, numbered E99362058, was issued on February 9, 2026, and is valid through March 1, 2031. The entity is classified as Educational organization type and is authorized under the Retailers' Occupation Tax Act to purchase tangible personal property for use or consumption tax-free in Illinois.

The certificate is addressed to UChicago Argonne LLC at 5801 S Ellis Ave, Chicago, IL 60637-5418, with the laboratory's primary location noted as 9700 S Cass Ave Bldg 201, Lemont, IL 60439-4801. The recipient is instructed to verify all information for accuracy and contact the Illinois Department of Revenue's Exemption Section 3-520 immediately if corrections are needed. The certificate is designated as an official document that should not be destroyed and serves as the authoritative document for tax-exempt purchasing authority within Illinois.

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Taxpayer Notification Sales Tax Exemption tax.illinois.gov

UCHICAGO ARGONNE LLC

ATTN: ARGONNE NATIONAL LABORATORY

9700 S CASS AVE BLDG 201

LEMONT IL 60439-4801

February 10, 2026

Letter ID: L0321989352 E99 No.: E99362058

We have enclosed your Illinois Sales Tax Exemption Certificate Welcome!

We have enclosed your Illinois Sales Tax Exemption Certificate. Verify that all of the information is correct. If any corrections are needed you must contact us immediately at the telephone number listed below.

Do not discard. Your Illinois Sales Tax Exemption Certificate is an important tax document that authorizes you under the Retailers’ Occupation Tax Act to purchase tangible personal property for use or consumption tax-free.

If you wish to be registered for any other taxes or fees, you must complete a new application. For additional information or questions, visit our website at tax.illinois.gov or call us weekdays between 8:00 a.m. and 4:30 p.m. at the telephone number below

EXEMPTION SECTION 3-520

ILLINOIS DEPARTMENT OF REVENUE

101 WEST JEFFERSON STREET

SPRINGFIELD IL 62702

217 782-8881 REV.E99@illinois.gov

Enclosure(s)

STAX-70 (R-05/16)

P-000023

01/02

Verify that all of your Illinois Sales Tax Exemption Certificate information is correct

If not, contact us immediately.

Do not discard - your Illinois Sales Tax Exemption Certificate is an important tax document that authorizes you to purchase tangible personal property for use or consumption tax-free.

UCHICAGO ARGONNE LLC

5801 S ELLIS AVE

CHICAGO IL 60637-5418

Issue date: Sales Tax Exemption E99362058 02/09/2026 Expiration date: Organization type:

03/01/2031

This entity is authorized under the Retailers’ Occupation Tax Act to purchase tangible personal property for use or consumption tax-free.

Educational

STAX-70 (R-05/16)

P-000024

02/02

File details come from the government source that posted it. Updated .