Title of 12(b) Security
United States Securities and Exchange CommissionWashington, D.C. 20549 Form 10-K  

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| ☑ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. |

 For the fiscal year ended December 31, 2021. 

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| ☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. |

 For the transition period from \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ to \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_. Commission file number 000-04604  Cincinnati Financial Corporation (Exact name of registrant as specified in its charter) 

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| Ohio | 31-0746871 |
| (State of incorporation) | (I.R.S. Employer Identification No.) |

  
 6200 S. Gilmore Road Fairfield, Ohio 45014-5141 (Address of principal executive offices) (Zip Code)(513) 870-2000 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act:

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| Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered |
| Common stock, $2.00 par |  | CINF |  | Nasdaq Global Select Market |

  
Securities registered pursuant to Section 12(g) of the Act:None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☑      No ☐ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐      No ☑ Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No ☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 if Regulation S-T(§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑      No ☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” “smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.Cincinnati Financial Corporation - 2021 10-K - Page 1
