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Date of Report (Date of earliest event reported) January 17, 2024



Microsoft Corporation




Washington   001-37845   91-1144442
(State or Other Jurisdiction
of Incorporation)
File Number)
  (IRS Employer
Identification No.)


One Microsoft Way, Redmond, Washington   98052-6399

(425) 882-8080




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 class




Name of exchange
on which registered

Common stock, $0.00000625 par value per share   MSFT   NASDAQ
3.125% Notes due 2028   MSFT   NASDAQ
2.625% Notes due 2033   MSFT   NASDAQ

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 1.05. Material Cybersecurity Incidents

On January 12, 2024, Microsoft (the “Company” or “we”) detected that beginning in late November 2023, a nation-state associated threat actor had gained access to and exfiltrated information from a very small percentage of employee email accounts including members of our senior leadership team and employees in our cybersecurity, legal, and other functions, on the basis of preliminary analysis. We were able to remove the threat actor’s access to the email accounts on or about January 13, 2024. We are examining the information accessed to determine the impact of the incident. We also continue to investigate the extent of the incident. We have notified and are working with law enforcement. We are also notifying relevant regulatory authorities with respect to unauthorized access to personal information. As of the date of this filing, the incident has not had a material impact on the Company’s operations. The Company has not yet determined whether the incident is reasonably likely to materially impact the Company’s financial condition or results of operations.

This Form 8-K contains forward-looking statements, which are any predictions, projections or other statements about future events based on current expectations and assumptions that are subject to risks and uncertainties, which are described in our filings with the Securities and Exchange Commission. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and the Company undertakes no duty to update any forward-looking statement to conform the statement to actual results or changes in the Company’s expectations.

Item 7.01. Regulation FD Disclosure

On January 19, 2024, the Company posted a blog regarding the incident. A copy of the blog is furnished as Exhibit 99.1 to this report.

In accordance with General Instruction B.2 of Form 8-K, the information in this Item 7.01 and Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits:


99.1    Microsoft Blog Post dated January 19, 2024 titled “Microsoft Actions Following Attack by Nation State Actor Midnight Blizzard”
104    Cover Page Interactive Data File (embedded within the Inline XBRL document)



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.


Date: January 19, 2024      

/s/ Keith R. Dolliver

      Keith R. Dolliver
      Corporate Secretary