CSG director’s shares cashed out at $80.70

CSG Systems International director Rajan Naik reported a disposition of 28,878 shares of common stock on May 14, 2026, as part of the closing of the company’s merger with NEC Corporation.

Rhea-AI Filing Summary

CSG Systems International director Rajan Naik reported a disposition of 28,878 shares of common stock on May 14, 2026, as part of the closing of the company’s merger with NEC Corporation. Each share was converted into the right to receive $80.70 in cash, less applicable withholding taxes.

The filing shows his direct common stock holdings dropped to 0 shares after the transaction. The disclosure notes that his position included 3,085 unvested restricted stock awards (RSAs), which now represent a right to receive the same cash amount per share, subject to their existing vesting conditions.

Insider Trade Summary

Disposition: 28,878 shares

Disposition 1 txn

Insider NAIK RAJAN

Role Director

Type	Security	Shares	Price	Value
Disposition	Common Stock	28,878	$80.70	$2.33M

Holdings After Transaction: Common Stock — 0 shares (Direct)

Footnotes (2)

1. F1. On May 14, 2026, pursuant to that certain Agreement and Plan of Merger, dated as of October 29, 2025 (the "Merger Agreement"), by and among CSG Systems International, Inc. (the "Issuer"), NEC Corporation ("Parent") and Canvas Transaction Company, Inc., a direct or indirect wholly owned subsidiary of Parent ("Merger Sub"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer surviving the Merger as a wholly owned subsidiary of Parent. Pursuant to the Merger Agreement, each share of Issuer common stock, par value $0.01 per share, and each unvested share of restricted stock ("RSA") held by the Reporting Person immediately prior to the closing of the Merger was converted into the right to receive $80.70 in cash, without interest, less any applicable withholding taxes.
2. F2. Includes 3,085 RSAs. Any payment with respect to unvested RSAs will be subject to vesting conditions on substantially the same terms and conditions as applied to such awards immediately prior to the effective time of the Merger, except for terms rendered inoperative by reason of the Merger.

Key Figures

Shares disposed: 28,878 shares Cash consideration per share: $80.70 per share Shares after transaction: 0 shares +2 more

5 metrics

Shares disposed 28,878 shares Common stock converted in merger on May 14, 2026

Cash consideration per share $80.70 per share Merger consideration for each CSG Systems share

Shares after transaction 0 shares Direct common stock holdings following disposition

Unvested RSAs 3,085 RSAs Restricted stock awards converted to cash rights subject to vesting

Merger closing date May 14, 2026 Effective date of merger-related share conversion

Key Terms

Agreement and Plan of Merger, restricted stock, RSAs, withholding taxes, +1 more

5 terms

Agreement and Plan of Merger regulatory

"pursuant to that certain Agreement and Plan of Merger, dated as of October 29, 2025"

An Agreement and Plan of Merger is a formal document where two companies agree to combine into one, outlining how the process will happen. It’s like a step-by-step plan for merging, and it matters because it shows both sides have agreed on the details before the official transition takes place.

restricted stock financial

"each unvested share of restricted stock ("RSA") held by the Reporting Person"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

RSAs financial

"Includes 3,085 RSAs. Any payment with respect to unvested RSAs will be subject to vesting conditions"

withholding taxes financial

"right to receive $80.70 in cash, without interest, less any applicable withholding taxes"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

wholly owned subsidiary financial

"the Issuer surviving the Merger as a wholly owned subsidiary of Parent"

A wholly owned subsidiary is a company whose entire ownership is held by another company (the parent), so the parent controls decisions, operations, and finances. Think of it as a fully controlled branch that runs as its own legal entity but whose results flow straight into the parent’s financial statements; investors watch these structures because they affect consolidated revenue, risk exposure, and how profits, liabilities, and cash flow are allocated across the corporate group.

FAQ

What did CSG Systems (CSGS) director Rajan Naik report in this Form 4?

Rajan Naik reported disposing of his CSG Systems common stock in connection with the NEC merger. His shares were converted into a cash right at $80.70 per share, reducing his direct common stock holdings to zero after the transaction.

How many CSG Systems (CSGS) shares were cashed out for Rajan Naik?

The Form 4 shows 28,878 shares of CSG Systems common stock were converted. Each share became a right to receive $80.70 in cash in the merger, resulting in no remaining directly held common shares for Rajan Naik afterward.

What cash amount per share did CSGS director Rajan Naik receive in the NEC merger?

Each CSG Systems share held by Rajan Naik was converted into the right to receive $80.70 in cash. This consideration applies to both common stock and restricted stock awards, subject to withholding taxes and existing vesting conditions for unvested RSAs.

What happened to Rajan Naik’s unvested RSAs in CSG Systems (CSGS)?

The filing notes his holdings included 3,085 restricted stock awards. These unvested RSAs were converted into a right to receive $80.70 per share in cash, but payments remain subject to substantially the same vesting terms as before the merger closed.

Does Rajan Naik hold any CSG Systems (CSGS) common stock after the merger transaction?

After the merger-related disposition, the Form 4 reports that Rajan Naik directly holds zero shares of CSG Systems common stock. His remaining economic interest relates to unvested restricted stock awards that now represent rights to future cash payments upon vesting.

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Accepted by SEC EDGAR 05/18/2026 - 04:30 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

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^*

NAIK RAJAN

(Last) (First) (Middle)

169 INVERNESS DR. W SUITE 300

(Street)

ENGLEWOOD COLORADO 80112

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

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

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

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

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	05/14/2026		D		28,878(1)(2)	D	$80.7(1)(2)	0	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. On May 14, 2026, pursuant to that certain Agreement and Plan of Merger, dated as of October 29, 2025 (the "Merger Agreement"), by and among CSG Systems International, Inc. (the "Issuer"), NEC Corporation ("Parent") and Canvas Transaction Company, Inc., a direct or indirect wholly owned subsidiary of Parent ("Merger Sub"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer surviving the Merger as a wholly owned subsidiary of Parent. Pursuant to the Merger Agreement, each share of Issuer common stock, par value $0.01 per share, and each unvested share of restricted stock ("RSA") held by the Reporting Person immediately prior to the closing of the Merger was converted into the right to receive $80.70 in cash, without interest, less any applicable withholding taxes.

2. Includes 3,085 RSAs. Any payment with respect to unvested RSAs will be subject to vesting conditions on substantially the same terms and conditions as applied to such awards immediately prior to the effective time of the Merger, except for terms rendered inoperative by reason of the Merger.

	/s/ Andrea Matheny, attorney-in-fact	05/18/2026
	** 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).
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.
* Form 4: SEC 1474 (03-26)