Company: LPSN
Filing Date: 2025-08-11
Form Type: DEFA14A
Source: 0001193125-25-177966
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Company: LIVEPERSON 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 8, 2025 LivePerson, Inc. (Exact Name of Registrant as Specified in its Charter)

| Delaware                     |     | 0-30141     |     | 13-3861628         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission 
 File Number |     | -I.R.S. Employer   
 Identification No. |

530 7th Ave, Floor M1 New York, New York 10018 (Address of principal executive offices, with zip code) (212) 609-4200 Registrant’s telephone number, including area code N/A (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:

| ☐ | 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 each exchange       
 on which registered         |
| Common Stock, par value $0.001 per share                         |     | LPSN      |     | The Nasdaq Stock Market LLC |
| Rights to Purchase Series A Junior Participating Preferred Stock |     | None      |     | The Nasdaq Stock Market LLC |

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.