Company: GOOGL
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0001193125-25-261740
Chunk: 4

Company: Alphabet Inc.
Filing Date: 2025-11-03
Form: 424B5
Chunk 4
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 or Item 7.01 of our Current Reports on Form 8-Kor Form 8-K/Aafter the date of this prospectus supplement unless, and except to the extent, specified in such Current Reports. When we use the term “prospectus supplement” in this prospectus supplement and the accompanying prospectus, we are referring to this prospectus supplement as updated and supplemented by all information incorporated by reference herein from any Annual Report on Form 10-K,Quarterly Report on Form 10-Qand Current Report on Form 8-Kand any other documents incorporated by reference in this prospectus supplement as described above. You may request a free copy of the above filings by writing, telephoning or e-mailingour Investor Relations department at the following address: Alphabet Inc. 1600 Amphitheatre Parkway Mountain View, California 94043 (650) 253-0000 Email: investor-relations@abc.xyz S-iii

FORWARD-LOOKING STATEMENTS This prospectus supplement and the accompanying prospectus, including the documents incorporated by reference herein or therein, include forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements include, among other things, statements regarding:

| • |     | the growth of our business and revenues and our expectations about the factors that influence our success and 
 trends in our business;                                                                                       |

| • |     | fluctuations in our revenues and margins and various factors contributing to such fluctuations; |

| • |     | our expectation that the continuing shift to an online world as the digital economy evolves will continue to 
 benefit our business;                                                                                        |

| • |     | our expectation that the revenues that we derive beyond advertising will continue to increase and may affect our 
 margins;                                                                                                         |

| • |     | our expectation that our traffic acquisition costs (TAC) and the associated TAC rate will fluctuate, which could 
 affect our overall margins;                                                                                      |

| • |     | our expectation that our monetization trends will fluctuate, which could affect our revenues and margins; |

| • |     | fluctuations in paid clicks and                                                    
 cost-per-click as well as impressions and cost-per-impression, and various factors 
 contributing to such fluctuations;                                                 |

| • |     | our expectation that we will continue to periodically review, refine, and update our methodologies for                                                                        
 monitoring, gathering, and counting the number of paid clicks and impressions, and for identifying the revenues generated by the corresponding click and impression activity; |