# EDGAR Filing Document

**Accession Number:** 0001717514
**File Stem:** 0001717514-26-000012
**Filing Date:** 2026-4
**Character Count:** 9808
**Document Hash:** e49371b7396c6ad23a31f6279cb63219
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001717514-26-000012.hdr.sgml**: 20260409

**ACCESSION NUMBER**: 0001717514-26-000012

**CONFORMED SUBMISSION TYPE**: 4/A

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260403

**FILED AS OF DATE**: 20260409

**DATE AS OF CHANGE**: 20260409

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Maddock Kevin
- **CENTRAL INDEX KEY:** 0001717514

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37397
- **FILM NUMBER:** 26852917

**MAIL ADDRESS:**
- **STREET 1:** 1700 S. PAVILION CENTER DRIVE
- **STREET 2:** SUITE 330
- **CITY:** LAS VEGAS
- **STATE:** NV
- **ZIP:** 89169
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Rimini Street, Inc.
- **CENTRAL INDEX KEY:** 0001635282
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-BUSINESS SERVICES, NEC [7389]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 364880301
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 1700 S. PAVILION CENTER DR.
- **STREET 2:** SUITE 330
- **CITY:** LAS VEGAS
- **STATE:** NV
- **ZIP:** 89135
- **BUSINESS PHONE:** (702) 839-9671

**MAIL ADDRESS:**
- **STREET 1:** 1700 S. PAVILION CENTER DR.
- **STREET 2:** SUITE 330
- **CITY:** LAS VEGAS
- **STATE:** NV
- **ZIP:** 89135

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GP Investments Acquisition Corp.
- **DATE OF NAME CHANGE:** 20150227

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4/A

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Maddock Kevin<br><sub>(Last) (First) (Middle)</sub><br>C/O 1700 S. PAVILION CENTER DRIVE<br>SUITE 330<br><sub>(Street)</sub><br>LAS VEGAS, NV 89135<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-04-03 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_EVP,ChiefRecurringRev.Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Rimini Street, Inc. [ RMNI ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common  Stock | 2026-04-03 |  | M |  | 5090 | A | $0 | 192568 | D |  |
| Common  Stock | 2026-04-03 |  | M |  | 15371<sup>(1)</sup> | A | $0 | 207939 | D |  |
| Common  Stock | 2026-04-03 | 2026-04-09<sup>(2)</sup> | S<sup>(3)</sup> |  | 1906<sup>(3)</sup> | D<sup>(3)</sup> | $3.3499 | 206033 | D |  |
| Common  Stock | 2026-04-03 | 2026-04-09<sup>(2)</sup> | S<sup>(4)</sup> |  | 5742<sup>(4)</sup> | D<sup>(4)</sup> | $3.3499 | 200291 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Restricted Stock Units | <sup>(5)</sup> | 2026-04-03 |  | M |  |  | 5090 | <sup>(6)</sup> | <sup>(6)</sup> | Common  Stock | 5090 | $0 | 0 | D |  |
| Performance Units | <sup>(7)</sup> | 2026-04-03 |  | M |  |  | 15371 | <sup>(8)</sup> | <sup>(8)</sup> | Common  Stock | 15371 | $0 | 0 | D |  |

---

### Footnotes:

(1) Represents one-third of the total 46,106 "Earned Performance Units" (as previously reported by the Reporting Person on a Form 4 dated February 28, 2024) under the terms of the Issuer's 2023 Long-Term Incentive Plan based upon the Issuer's achievement against a target "Adjusted EBITDA" goal for fiscal year 2023 and the Issuer's achievement against a target "Total Revenue" performance goal for fiscal year 2023, effective as of February 28, 2024 (the date the Issuer filed its Annual Report on Form 10-K for the year ended December 31, 2023).

(2) The Reporting Person is amending his Form 4 filed April 7, 2026, to add automatic "sell-to-cover" transactions related to the payment of withholding tax obligations pursuant to the Issuer's policy for tax withholdings associated with Restricted Stock Unit and Performance Unit vesting events. The sales occurred over a three-day period (April 7, 8 and 9) and were processed by the Company's stock plan administrator. The Reporting Person did not initiate the sales and had no control over the timing of the sales. The sales were not reported by the Company's stock plan administrator to the Reporting Person until April 9, 2026.

(3) Reported transaction is an automatically-triggered "sell-to-cover" transaction related to the payment of withholding tax obligations pursuant to the Issuer's policy for tax withholdings associated with Restricted Stock Unit vesting events. The Reporting Person did not initiate the sale.

(4) Reported transaction is an automatically-triggered "sell-to-cover" transaction related to the payment of withholding tax obligations pursuant to the Issuer's policy for tax withholdings associated with Performance Unit vesting events. The Reporting Person did not initiate the sale.

(5) Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's Common Stock upon vesting.

(6) On April 3, 2023, the Reporting Person was granted 15,267 Restricted Stock Units, one-third of which vested on April 3, 2024, one-third of which vested on April 3, 2025, and one-third of which vested on April 3, 2026, generally subject to the Reporting Person continuing to be a Service Provider (as such term is defined in the Issuer's 2013 Equity Incentive Plan) through the vesting date.

(7) Each Performance Unit represents a contingent right to receive one share of the Issuer's Common Stock upon vesting.

(8) One-third of the "Earned Performance Units" vested on April 3, 2024, one-third of the "Earned Performance Units" vested on April 3, 2025, and one-third of the "Earned Performance Units" vested on April 3, 2026, generally subject to the Reporting Person continuing to be a Service Provider (as such term is defined in the Issuer's 2013 Equity Incentive Plan) through the vesting date.

**Remarks:**
The Reporting Person is amending his Form 4 filed April 7, 2026, to add automatic "sell-to-cover" transactions related to the payment of withholding tax obligations pursuant to the Issuer's policy for tax withholdings associated with Restricted Stock Unit and Performance Unit vesting events. The sales occurred over a three-day period (April 7, 8 and 9) and were processed by the Company's stock plan administrator. The Reporting Person did not initiate the sales and had no control over the timing of the sales. The sales were not reported by the Company's stock plan administrator to the Reporting Person until April 9, 2026.

**Signature:** /s/ Celeste Rasmussen Peiffer, as Attorney-in-Fact  
**Date:** 2026-04-09

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**