Company: AIP
Filing Date: 2025-12-11
Form Type: S-3
Source: 0001193125-25-316098
Chunk: 47

Company: Arteris, Inc.
Filing Date: 2025-12-11
Form: S-3
Chunk 47
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Us granted subsequent to September 30, 
 2025;                                                                                                |

| • |     | 3,438,175 shares of common stock reserved for future issuance under our 2021 Plan, as well as any automatic 
 increases in the number of shares of our common stock reserved for future issuance under the 2021 Plan; and |

| • |     | 1,882,728 shares of common stock reserved for future issuance under our Employee Stock Purchase Plan                                
 (ESPP), as well as any automatic increases in the number of shares of our common stock reserved for future issuance under the ESPP. |

In addition, unless we specifically state otherwise, all information in this prospectus supplement reflects and assumes no exercise of outstanding stock options or RSUs described above.

S-5

RISK FACTORS

Investing in our securities involves risks. You should carefully consider the risks, uncertainties and other factors described below and discussed under the section captioned “Risk Factors” contained in our most recent Annual Report on Form 10-K,as updated by our subsequent filings under the Exchange Act, each of which is incorporated by reference in this prospectus supplement in their entirety, together with other information in this prospectus supplement, and the information and documents incorporated by reference in this prospectus supplement, and any free writing prospectus that we have authorized for use in connection with this offering before you make a decision to invest in our common stock. If any of the following events actually occur, our business, operating results, prospects or financial condition could be materially and adversely affected. This could cause the trading price of our common stock to decline and you may lose all or part of your investment. The risks described below are not the only ones that we face. Additional risks not presently known to us or that we currently deem immaterial may also affect our business operations.

Risks Relating to this Offering

Our management team may invest or spend the proceeds of this offering in ways with which you may not agree or in ways which may not yield a significant return.

Our management will have broad discretion over the use of proceeds from this offering. The net proceeds from this offering
will be used for general corporate purposes. Our management will have considerable discretion in the application of the net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are
being used appropriately. The net proceeds may be used for corporate purposes that do not increase our operating results or enhance the value of our common stock.

You may experience immediate and