[Form 4] CSG SYSTEMS INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

CSG Systems International (CSGS) reported an insider transaction by EVP and General Counsel Rasmani Bhattacharya. On 10/10/2025, 612 shares of common stock were withheld (transaction code F) at $36 to satisfy tax withholding obligations upon the vesting of a restricted stock award. Following the withholding, 69,451 shares were beneficially owned, held directly.

This filing reflects administrative share withholding rather than an open‑market sale, and it does not change the number of shares issued by the company.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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

1. Name and Address of Reporting Person^*

Bhattacharya Rasmani

(Last) (First) (Middle)

169 INVERNESS DR. W

SUITE 300

(Street)

ENGLEWOOD CO 80112

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
CSG SYSTEMS INTERNATIONAL INC [ CSGS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
10/10/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/10/2025		F		612(1)	D	$36	69,451	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares withheld by the issuer to cover tax withholding obligations upon vesting of a restricted stock award.

	/s/ Andrea Matheny, attorney-in-fact for Rasmani Bhattacharya	10/14/2025
	** Signature of Reporting Person	Date
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).
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FAQ

What did CSGS disclose in this Form 4?

An insider transaction where 612 shares were withheld at $36 on 10/10/2025 to cover taxes upon RSU vesting.

Who is the reporting person in the CSGS Form 4?

Rasmani Bhattacharya, EVP and General Counsel of CSG Systems International.

How many CSGS shares were involved and at what price?

612 shares were withheld at a price of $36 per share.

What was the purpose of the share withholding?

The issuer withheld shares to cover tax withholding obligations upon vesting of a restricted stock award.

How many CSGS shares does the insider own after the transaction?

69,451 shares beneficially owned following the reported transaction, held directly.

What does transaction code F indicate on the Form 4?

The filing shows code F, corresponding to shares withheld by the issuer for tax withholding on an equity award vesting.