<!--Enhanced HTML document created with Toppan Merrill Bridge  9.10.0.88--><!--Created on: 6/10/2021 08:02:10 PM (UTC)--><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta charset="UTF-8"><title></title></head><body><div style="margin-top:30pt;"></div><div style="max-width:100%;padding-left:10.78%;padding-right:10.78%;position:relative;"><div style="margin-top:30pt;width:100%;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:right;margin:0pt;"><font style="font-weight:bold;visibility:hidden;">&#8203;</font></p></div><div style="clear:both;max-width:100%;position:relative;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><b style="font-size:14pt;font-weight:bold;">UNITED STATES</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><b style="font-size:14pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><b style="font-size:12pt;font-weight:bold;">WASHINGTON, D.C. 20549</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><font style="font-size:12pt;font-weight:bold;visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><b style="font-size:18pt;font-weight:bold;">FORM 8-K</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;">CURRENT REPORT</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><b style="font-weight:bold;">Pursuant to Section&#160;13 or 15 (d)&#160;of The Securities Exchange Act of 1934</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><font style="font-weight:bold;visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;">Date of Report (Date of earliest event reported): June 10, 2021</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><b style="font-size:22pt;font-weight:bold;">CAPSTONE GREEN ENERGY CORPORATION</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;">(Exact name of registrant as specified in its charter)</p><div><table 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style="vertical-align:top;width:29.99%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;">of incorporation)</p></td><td style="vertical-align:bottom;width:5.01%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">&#160;</p></td><td style="vertical-align:top;width:29.98%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;">&#160;</p></td><td style="vertical-align:bottom;width:5.01%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">&#160;</p></td><td style="vertical-align:top;width:29.98%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;">Identification No.)</p></td></tr></table></div><p style="font-family:'Times New 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Roman','Times','serif';font-size:10pt;margin:8pt 0pt 0pt 0pt;">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR &#167;230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR &#167;240.12b-2). </p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:8pt 0pt 0pt 0pt;">Emerging growth company <font style="font-family:'Times New Roman';">&#9723;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:6pt 0pt 0pt 0pt;">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. <font style="font-family:'Times New Roman';">&#9723;</font> </p></div></div><hr style="background-color:#000000;clear:both;color:#000000;height:2pt;line-height:0;margin-bottom:30pt;margin-left:10.78%;margin-right:10.78%;margin-top:30pt;page-break-after:always;width:78.45%;border-width:0;"><div style="max-width:100%;padding-left:10.78%;padding-right:10.78%;position:relative;"><div style="clear:both;max-width:100%;position:relative;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><b style="font-weight:bold;">Item&#160;2.02 Results of Operations and Financial Condition.</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">On June 10, 2021, Capstone Green Energy Corporation (the &#8220;Company&#8221;) issued a press release announcing its financial results for the fiscal year 2021 and fourth quarter ended March 31, 2021.&#160;A copy of the press release is furnished as Exhibit&#160;99.1 to this Current Report on Form 8-K.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="display:inline-block;visibility:hidden;width:0pt;">&#8203;</font><br>The information contained in Item 2.02 in this Current Report on Form 8-K (including Exhibit 99.1) is being furnished and shall not be deemed &#8220;filed&#8221; for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the &#8220;Exchange Act&#8221;), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><b style="font-weight:bold;">Item 9.01. Financial Statements and Exhibits.</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">(d)&#160;Exhibits: </p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><div style="padding-left:5.4pt;" align="left"><table style="border-collapse:collapse;font-size:16pt;height:max-content;table-layout:auto;width:98%;"><tr style="height:1pt;"><td style="vertical-align:bottom;width:10.75%;margin:0pt;padding:0pt 5.4pt 0pt 5.4pt;"><div style="height:1pt;overflow:hidden;overflow-wrap:break-word;position:relative;"><div style="bottom:0pt;position:absolute;width:100%;"></div></div></td><td style="vertical-align:bottom;width:89.24%;margin:0pt;padding:0pt 5.4pt 0pt 5.4pt;"><div style="height:1pt;overflow:hidden;overflow-wrap:break-word;position:relative;"><div style="bottom:0pt;position:absolute;width:100%;"></div></div></td></tr><tr><td style="vertical-align:bottom;width:10.75%;margin:0pt;padding:0pt 5.4pt 0pt 5.4pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;padding-bottom:1pt;text-align:center;border-bottom:1px solid #000000;margin:0pt;"><b style="font-weight:bold;">Exhibit <br>Number</b></p></td><td style="vertical-align:bottom;width:89.24%;margin:0pt;padding:0pt 5.4pt 0pt 5.4pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;padding-bottom:1pt;text-align:center;border-bottom:1px solid #000000;margin:0pt;"><b style="font-weight:bold;">Description</b></p></td></tr><tr><td style="vertical-align:top;width:10.75%;margin:0pt;padding:0pt 5.4pt 0pt 5.4pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">99.1</p></td><td style="vertical-align:top;width:89.24%;margin:0pt;padding:0pt 5.4pt 0pt 5.4pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><a style="-sec-extract:exhibit;" href="cgrn-20210610xex99d1.htm"><font style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:normal;font-weight:normal;text-align:left;">Press Release of Capstone Green Energy Corporation, dated June 10, 2021 containing information for the fiscal year and fourth quarter ended March 31, 2021 (furnished herewith)</font></a>.</p></td></tr></table></div><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;font-weight:bold;margin:0pt 0pt 24pt 0pt;"><font style="font-size:10pt;visibility:hidden;">&#8203;</font></p></div></div><hr style="background-color:#000000;clear:both;color:#000000;height:2pt;line-height:0;margin-bottom:30pt;margin-left:10.78%;margin-right:10.78%;margin-top:30pt;page-break-after:always;width:78.45%;border-width:0;"><div style="max-width:100%;padding-left:10.78%;padding-right:10.78%;position:relative;"><div style="clear:both;max-width:100%;position:relative;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-weight:bold;padding-left:36pt;text-align:center;text-indent:-36pt;margin:0pt 0pt 24pt 0pt;">SIGNATURE</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:36pt;margin:0pt 0pt 6pt 0pt;">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.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:center;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p><div><table style="border-collapse:collapse;font-size:16pt;height:max-content;margin-left:-0.0010414124%;padding-left:0pt;padding-right:0pt;width:100%;" align="center"><tr style="height:1pt;"><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><div style="height:1pt;overflow:hidden;overflow-wrap:break-word;position:relative;"><div style="position:absolute;top:0pt;width:100%;"></div></div></td><td style="vertical-align:top;width:3.43%;margin:0pt;padding:0pt;"><div style="height:1pt;overflow:hidden;overflow-wrap:break-word;position:relative;"><div style="position:absolute;top:0pt;width:100%;"></div></div></td><td style="vertical-align:top;width:46.58%;margin:0pt;padding:0pt;"><div style="height:1pt;overflow:hidden;overflow-wrap:break-word;position:relative;"><div style="position:absolute;top:0pt;width:100%;"></div></div></td></tr><tr style="height:1pt;"><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><div style="height:1pt;overflow:hidden;overflow-wrap:break-word;position:relative;"><div style="position:absolute;top:0pt;width:100%;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="font-size:1pt;visibility:hidden;">&#8203;</font></p></div></div></td><td colspan="2" style="vertical-align:top;width:50.02%;margin:0pt;padding:0pt;"><div style="height:1pt;overflow:hidden;overflow-wrap:break-word;position:relative;"><div style="position:absolute;top:0pt;width:100%;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="font-size:1pt;visibility:hidden;">&#8203;</font></p></div></div></td></tr><tr><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;margin:0pt;"><font style="font-size:10pt;margin-bottom:30pt;margin-top:12pt;visibility:hidden;">&#8203;</font></p></td><td colspan="2" style="vertical-align:top;width:50.02%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">CAPSTONE GREEN ENERGY CORPORATION</p></td></tr><tr><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;margin:0pt;"><font style="font-size:10pt;margin-bottom:12pt;visibility:hidden;">&#8203;</font></p></td><td colspan="2" style="vertical-align:top;width:50.02%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;margin:0pt;"><font style="font-size:10pt;margin-bottom:12pt;visibility:hidden;">&#8203;</font></p></td></tr><tr><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><p style="font-family:'Arial','Helvetica','sans-serif';font-size:12pt;margin:0pt;"><font style="font-family:'Times New Roman','Times','serif';font-size:10pt;visibility:hidden;">&#8203;</font></p></td><td colspan="2" style="vertical-align:top;width:50.02%;margin:0pt;padding:0pt;"><p style="font-family:'Arial','Helvetica','sans-serif';font-size:12pt;margin:0pt;"><font style="font-family:'Times New Roman','Times','serif';font-size:10pt;visibility:hidden;">&#8203;</font></p></td></tr><tr><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">Date: June 10, 2021</p></td><td style="vertical-align:top;width:3.43%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">By: </p></td><td style="vertical-align:top;width:46.58%;border-bottom:1px solid #000000;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">/s/ Frederick S. Hencken III</p></td></tr><tr><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;margin:0pt;"><font style="font-size:10pt;margin-bottom:12pt;visibility:hidden;">&#8203;</font></p></td><td style="vertical-align:top;width:3.43%;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;margin:0pt;"><font style="font-size:10pt;margin-bottom:12pt;visibility:hidden;">&#8203;</font></p></td><td style="vertical-align:top;width:46.58%;border-top:1px solid #000000;margin:0pt;padding:0pt;"><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">Name: Frederick S. Hencken III</p></td></tr><tr><td style="vertical-align:top;width:49.97%;margin:0pt;padding:0pt;"><p style="font-family:'Arial','Helvetica','sans-serif';font-size:12pt;margin:0pt;"><font style="font-family:'Times New Roman','Times','serif';font-size:10pt;visibility:hidden;">&#8203;</font></p></td><td style="vertical-align:top;width:3.43%;margin:0pt;padding:0pt;"><p style="font-family:'Arial','Helvetica','sans-serif';font-size:12pt;margin:0pt;"><font style="font-family:'Times New Roman','Times','serif';font-size:10pt;visibility:hidden;">&#8203;</font></p></td><td style="vertical-align:top;width:46.58%;margin:0pt;padding:0pt;"><p style="font-family:'Arial','Helvetica','sans-serif';font-size:10pt;margin:0pt;"><font style="font-family:'Times New Roman','Times','serif';">Title: Chief Financial Officer (Principal Financial Officer)</font></p></td></tr></table></div><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><font style="visibility:hidden;">&#8203;</font></p></div></div><hr style="background-color:#000000;clear:both;color:#000000;height:2pt;line-height:0;margin-left:10.78%;margin-right:10.78%;margin-top:30pt;page-break-after:avoid;width:78.45%;border-width:0;"></body></html>
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​
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 of earliest event reported): June 10, 2021
​
CAPSTONE GREEN ENERGY CORPORATION
(Exact name of registrant as specified in its charter)
​
​
​
​
​
Delaware
001-15957
95-4180883
(State or other jurisdiction
(Commission File Number)
(IRS Employer
of incorporation)
Identification No.)
​
​
​
​
​
​
16640 Stagg Street,
Van Nuys, California
​
91406
(Address of principal executive offices)
​
(Zip Code)
​
(818) 734-5300
(Registrant's telephone number, including area code)
​
Former name or former address, if changed since last report: N/A
​
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:
​
​
Title of each class
​
Trading Symbol(s)
​
Name of exchange on which registered
Common Stock, par value $.001 per share
​
CGRN
​
NASDAQ Capital Market
Series B Junior Participating Preferred Stock Purchase Rights
​
​
​
​
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).
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 2.02 Results of Operations and Financial Condition.
​
On June 10, 2021, Capstone Green Energy Corporation (the "Company") issued a press release announcing its financial results for the fiscal year 2021 and fourth quarter ended March 31, 2021. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.
​
The information contained in Item 2.02 in this Current Report on Form 8-K (including Exhibit 99.1) is being furnished and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.
​
​
Item 9.01. Financial Statements and Exhibits.
​
(d) Exhibits:
​
Exhibit
Number
Description
99.1
Press Release of Capstone Green Energy Corporation, dated June 10, 2021 containing information for the fiscal year and fourth quarter ended March 31, 2021 (furnished herewith)
.
​
​
SIGNATURE
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.
​
​
​
​
CAPSTONE GREEN ENERGY CORPORATION
​
​
​
​
Date: June 10, 2021
By:
/s/ Frederick S. Hencken III
​
​
Name: Frederick S. Hencken III
​
​
Title: Chief Financial Officer (Principal Financial Officer)
​