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U.S. SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported): April 22, 2021
ADVANCED EMISSIONS SOLUTIONS, INC.
(Name of registrant as specified in its charter)

Delaware |  | 001-37822 |  | 27-5472457
(State or other jurisdiction of incorporation) |  | (Commission File Number) |  | (I.R.S. Employer Identification Number)

8051 E. Maplewood Avenue, Suite 210, Greenwood Village, CO |  | 80111
(Address of principal executive offices) |  | (Zip Code)

Registrant's telephone number, including area code: (720) 598-3500
Not Applicable
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ |  | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ |  | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ |  | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ |  | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Class |  | Trading Symbol |  | Name of each exchange on which registered
Common stock, par value $0.001 per share |  | ADES |  | NASDAQ Global Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

| Emerging growth company | ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. | ☐

Item 8.01 |  | Other Events.

On April 23, 2021, Advanced Emissions Solutions, Inc. (the "Company"), a Delaware corporation, issued a press release related to an incident that occurred on April 22, 2021 at its Red River Plant in Coushatta, Louisiana. A copy of the Company’s press release, attached as Exhibit 99.1 to this report, is incorporated herein by reference.
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Item 9.01 |  | Financial Statements and Exhibits.
(d) |  | Exhibits

Exhibit No. |  | Description
99.1 |  | Press Release dated April 23, 2021

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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: April 23, 2021

| Advanced Emissions Solutions, Inc.
| Registrant

| /s/ Greg Marken
| Greg Marken
| Interim Chief Executive Officer

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