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stem-20260304FALSE000175876600017587662026-03-042026-03-04

UNITED STATES

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 Earliest Event Reported): March 4, 2026

STEM, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3945585-1972187 (State or Other Jurisdiction of Incorporation) (Commission File Number)(IRS Employer Identification No.)

1400 Post Oak Boulevard , Suite 560, Houston, Texas 77056 (Address of principal executive offices including zip code) 1-877-374-7836 Registrant’s telephone number, including area code

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 (see General Instruction A.2. below):

☐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:

Title of each classTrading Symbol(s) Name of each exchange on which registered

Common stock, par value $0.0001STEMNew York Stock Exchange

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. ☐

2

Item 2.02. Results of Operations and Financial Condition. On March 4, 2026, Stem, Inc. (the “Company”) issued a press release announcing its financial results for the fourth quarter and full year 2025. The press release has been posted on the Company’s internet website at https://investors.stem.com/stock-and-financials/quarterly-results/default.aspx. A copy of the press release is furnished herewith as Exhibit 99 and is incorporated herein by reference into this Item 2.02. Slides in connection with the press release are available on the Stem Investor Relations website at https://investors.stem.com/stock-and-financials/quarterly-results/default.aspx. In accordance with General Instructions B.2. of Form 8-K, the information will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor will it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), except as expressly set forth by specific reference in such a filing.

Item 7.01. Regulation FD Disclosure. On March 4, 2026, the Company issued a press release, a copy of which is furnished with this Form 8-K as Exhibit 99 and incorporated into this Item 7.01 by reference. In accordance with General Instruction B.2. of Form 8-K, the information will not be deemed “filed” for purposes of Section 18 of the Exchange Act, nor will it be deemed incorporated by reference into any filing under the Securities Act, except as expressly set forth by specific reference in such a filing. Also, see Item 2.02, “Results of Operations and Financial Condition.”

Item 9.01. Financial Statements and Exhibits. (d) Exhibits The exhibit listed below is furnished pursuant to Item 9.01 of this Form 8-K.

Exhibit No.Description 99Fourth Quarter and Full Year 2025 Earnings Release

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

3

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

STEM, INC.

Date: March 4, 2026 By:/s/ Saul R. Laureles Name:Saul R. Laureles Title:Chief Legal Officer and Secretary

4

stem-20251029FALSE000175876600017587662025-10-292025-10-29

UNITED STATES

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 Earliest Event Reported): October 29, 2025

STEM, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3945585-1972187 (State or Other Jurisdiction of Incorporation) (Commission File Number)(IRS Employer Identification No.)

1400 Post Oak Boulevard., Suite 560, Houston, Texas 77056 (Address of principal executive offices including zip code) 1-877-374-7836 Registrant’s telephone number, including area code

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 (see General Instruction A.2. below):

☐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:

Title of each classTrading Symbol(s) Name of each exchange on which registered

Common stock, par value $0.0001STEMNew York Stock Exchange

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. ☐

2

Item 2.02. Results of Operations and Financial Condition. On October 29, 2025, Stem, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended September 30, 2025. The press release has been posted on the Company’s internet website at https://investors.stem.com/stock-and-financials/quarterly-results/default.aspx. A copy of the press release is furnished herewith as Exhibit 99 and is incorporated herein by reference into this Item 2.02. Slides in connection with the press release are also available on the Stem Investor Relations website at https://investors.stem.com/stock-and-financials/quarterly-results/default.aspx. In accordance with General Instructions B.2. of Form 8-K, the information will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor will it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), except as expressly set forth by specific reference in such a filing.

Item 7.01. Regulation FD Disclosure. On October 29, 2025, the Company issued a press release, a copy of which is furnished with this Form 8-K as Exhibit 99 and incorporated into this Item 7.01 by reference. In accordance with General Instruction B.2. of Form 8-K, the information will not be deemed “filed” for purposes of Section 18 of the Exchange Act, nor will it be deemed incorporated by reference into any filing under the Securities Act, except as expressly set forth by specific reference in such a filing. Also, see Item 2.02, “Results of Operations and Financial Condition.”

Item 9.01. Financial Statements and Exhibits. (d) Exhibits The exhibit listed below is furnished pursuant to Item 9.01 of this Form 8-K.

Exhibit No.Description 99Third Quarter 2025 Earnings Release

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

3

SIGNATURES

Pursuant to the requirements of the Exchange Act, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

STEM, INC.

Date: October 29, 2025 By:/s/ Saul R. Laureles Name:Saul R. Laureles Title:Chief Legal Officer and Secretary

4