Company: CFG-PE
Filing Date: 2025-02-25
Form Type: 424B2
Source: 0001193125-25-035197
Chunk: 1

Company: CITIZENS FINANCIAL GROUP INC/RI
Filing Date: 2025-02-25
Form: 424B2
Chunk 1
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 future subsidiaries. The notes will be issued only in registered book-entry form, in denominations of $2,000 and integral multiples of $1,000 in excess thereof. We do not intend to apply for the listing of the notes on any securities exchange or to have the notes quoted on a quotation system. Currently there is no public market for the notes. The notes are not savings accounts, deposits or other obligations of a bank and are not insured by the Federal Deposit Insurance Corporation (“FDIC”) or any other governmental agency. Investing in the notes involves risk. See “ Risk Factors” beginning on page S-7of this prospectus supplement and beginning on page 21 of our Annual Report on Form 10-Kfor the fiscal year ended December 31, 2024 (the “2024 Form 10-K”)to read about factors you should consider before making a decision to invest in the notes. Neither the Securities and Exchange Commission (the “SEC”), any state securities commission, the FDIC, the Board of Governors of the Federal Reserve System nor any other regulatory body has approved or disapproved of these securities or determined if this prospectus supplement and the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

|                                     |     | Notes    
 Per Note |         |   |     | Total |             |
|:------------------------------------|:----|:---------|--------:|:--|:----|:------|------------:|
| Price to public(1)                  |     |          | 100.000 | % |     | $     | 750,000,000 |
| Underwriting discount               |     |          |   0.250 | % |     | $     |   1,875,000 |
| Proceeds, before expenses, to us(1) |     |          |  99.750 | % |     | $     | 748,125,000 |

| (1) | Plus accrued interest, if any, from March 5, 2025. |

The underwriters expect to deliver the notes to purchasers in book-entry form only through The Depository Trust Company (“DTC” or “Depositary”), for the benefit of its participants, including Clearstream Banking S.A. (“Clearstream”) and Euroclear Bank SA/NV (“Euroclear”), on or about March 5, 2025. See “Book-Entry; Delivery and Form.” Joint Book-Running Managers

| Citigroup |     |