Company: EUO
Filing Date: 2025-06-06
Form Type: 8-K/A
Source: 0001193125-25-137140
Chunk: 1

Company: ProShares Trust II
Filing Date: 2025-06-06
Form: 8-K/A
Chunk 1
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-4(c)) |

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-2of the Securities Exchange Act of 1934 (§240.12b-2of 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. ☐

#### EXPLANATORY NOTEThis filing updates the Press Release dated May 28, 2025 filed as Exhibit No. 99.1 to the Form8-Kfiled by ProShares Trust II with the Securities and Exchange Commission on May 29, 2025. That Press Release contained a typographical error with respect to information relating to a fund which is not a series of ProShares Trust II. The corrected Press Release is filed herewith as Exhibit No. 99.1.Item 9.01Financial Statements and Exhibits(d) ExhibitsExhibitNo.Description99.1Press Release Dated May 28, 2025.104The cover page from this Current Report on Form8-K,formatted in Inline XBRL
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. Date: June 6, 2025

| ProShares Trust II |     |                             |
| By:                |     | /s/ Todd B. Johnson         |
|                    |     | Todd B. Johnson             |
|                    |     | Principal Executive Officer |