Company: MSTR
Filing Date: 2025-08-11
Form Type: DEFA14A
Source: 0001193125-25-177525
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Company: Strategy Inc
Filing Date: 2025-08-11
Form: DEFA14A
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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): August 11, 2025 MICROSTRATEGY INCORPORATED (Exact name of registrant as specified in its charter)

| Delaware                     |     | 001-42509   |     | 51-0323571         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission 
 File Number |     | -I.R.S. Employer   
 Identification No. |

| 1850 Towers Crescent Plaza               
 Tysons Corner, Virginia                  |     |     22182 |
| (Address of principal executive offices) |     | -Zip Code |

Registrant’s telephone number, including area code: (703) 848-8600 (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions ( seeGeneral 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                                                                  |     | Trading 
 Symbol  |     | Name of Each Exchange           
 on which Registered             |
| Class A common stock, $0.001 par value per share                                     |     | MSTR    |     | The Nasdaq Global Select Market |
| 8.00% Series A Perpetual Strike Preferred Stock, $0.001 par value per share          |     | STRK    |     | The Nasdaq Global Select Market |
| 10.00% Series A Perpetual Strife Preferred Stock, $0.001 par