Plan of Merger	3 Months Ended
Mar. 31, 2026
Business Combination [Abstract]
Plan of Merger	2. PLAN OF MERGER On October 29, 2025, we entered into an Agreement and Plan of Merger (the “Merger Agreement”) with NEC Corporation, a company incorporated under the laws of Japan (“NEC”) and Canvas Transaction Company, Inc., a Delaware corporation and a direct or indirect wholly owned subsidiary of NEC (“Merger Sub”). Pursuant to the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub will merge with and into CSG (the “Merger”), with CSG continuing as the surviving corporation as a wholly owned subsidiary of NEC. Our Board of Directors (the “Board”) unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger, and, subject to the terms of the Merger Agreement, recommended that our stockholders adopt the Merger Agreement. Per the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of CSG common stock that is issued and outstanding immediately prior to the Effective Time (other than the Cancelled Shares and Dissenting Shares, as they are defined in the Merger Agreement), will be converted into the right to receive $80.70 per share in cash (the “Merger Consideration”). In addition, the Merger Agreement provides for the following treatment of our equity awards: • Each outstanding time-based restricted stock award that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards granted in 2024 that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding time-based restricted stock award will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding restricted stock award. • Each outstanding performance-based or market-based restricted stock award (other than the Chief Executive Officer (“CEO”) Award (as defined below)) that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award (with applicable performance metrics generally deemed achieved at the greater of target and actual performance as of the latest practicable date prior to the Effective Time) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding performance-based or market-based restricted stock award (other than the CEO Award) will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration (with applicable performance metrics deemed achieved at the greater of target and actual performance as of the latest practicable date prior to the Effective Time), plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding performance-based or market-based restricted stock award. • The market-based restricted stock award granted to our CEO on December 10, 2024 (the “CEO Award”) will be converted into a deferred cash award based on the number of CSG shares underlying such award (with applicable performance metrics deemed achieved based on the Merger Consideration) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the CEO Award. On January 30, 2026, our stockholders approved the adoption of the Merger Agreement at the special meeting of our stockholders convened for such purpose. The closing of the Merger is expected to occur by the end of 2026, subject to the satisfaction of the remaining customary closing conditions and required regulatory approvals. If the Merger is consummated, CSG shares will be delisted from the Nasdaq Global Select Market and deregistered under the Securities Exchange Act of 1934, as amended. If the Merger Agreement is terminated under certain specified circumstances, CSG will be required to pay NEC a termination fee of $82.0 million. If the Merger Agreement is terminated under other certain specified circumstances, NEC will be required to pay CSG a termination fee of $135.0 million. The foregoing summary of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Merger Agreement, which is filed as Exhibit 2.01 to our 2025 Form 10-K. Additional information about the Merger Agreement and the Merger is set forth in our Definitive Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission (“SEC”) on December 16, 2025, as supplemented. In connection with the proposed Merger, during the quarter ended March 31, 2026, we recognized $9.7 million of transaction-related costs primarily within Selling, General and Administrative expenses ("SG&A") in our unaudited Condensed Consolidated Statements of Income (the "Income Statements"). As of March 31, 2026, we have accrued approximately $19 million of transaction-related costs that will be paid upon closing. We expect to incur additional costs relating to the proposed Merger, such as financial advisory, legal, accounting, retention bonuses, and other professional services fees.

Plan of Merger

3 Months Ended

Mar. 31, 2026

2. PLAN OF MERGER

On October 29, 2025, we entered into an Agreement and Plan of Merger (the “Merger Agreement”) with NEC Corporation, a company incorporated under the laws of Japan (“NEC”) and Canvas Transaction Company, Inc., a Delaware corporation and a direct or indirect wholly owned subsidiary of NEC (“Merger Sub”). Pursuant to the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub will merge with and into CSG (the “Merger”), with CSG continuing as the surviving corporation as a wholly owned subsidiary of NEC. Our Board of Directors (the “Board”) unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger, and, subject to the terms of the Merger Agreement, recommended that our stockholders adopt the Merger Agreement.

Per the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of CSG common stock that is issued and outstanding immediately prior to the Effective Time (other than the Cancelled Shares and Dissenting Shares, as they are defined in the Merger Agreement), will be converted into the right to receive $80.70 per share in cash (the “Merger Consideration”).

In addition, the Merger Agreement provides for the following treatment of our equity awards:

•

Each outstanding time-based restricted stock award that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards granted in 2024 that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding time-based restricted stock award will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding restricted stock award.

•

Each outstanding performance-based or market-based restricted stock award (other than the Chief Executive Officer (“CEO”) Award (as defined below)) that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award (with applicable performance metrics generally deemed achieved at the greater of target and actual performance as of the latest practicable date prior to the Effective Time) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding performance-based or market-based restricted stock award (other than the CEO Award) will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration (with applicable performance metrics deemed achieved at the greater of target and actual performance as of the latest practicable date prior to the Effective Time), plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding performance-based or market-based restricted stock award.

•

The market-based restricted stock award granted to our CEO on December 10, 2024 (the “CEO Award”) will be converted into a deferred cash award based on the number of CSG shares underlying such award (with applicable performance metrics deemed achieved based on the Merger Consideration) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the CEO Award.

On January 30, 2026, our stockholders approved the adoption of the Merger Agreement at the special meeting of our stockholders convened for such purpose. The closing of the Merger is expected to occur by the end of 2026, subject to the satisfaction of the remaining customary closing conditions and required regulatory approvals. If the Merger is consummated, CSG shares will be delisted from the Nasdaq Global Select Market and deregistered under the Securities Exchange Act of 1934, as amended.

If the Merger Agreement is terminated under certain specified circumstances, CSG will be required to pay NEC a termination fee of $82.0 million. If the Merger Agreement is terminated under other certain specified circumstances, NEC will be required to pay CSG a termination fee of $135.0 million.

The foregoing summary of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Merger Agreement, which is filed as Exhibit 2.01 to our 2025 Form 10-K. Additional information about the Merger Agreement and the Merger is set forth in our Definitive Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission (“SEC”) on December 16, 2025, as supplemented.

In connection with the proposed Merger, during the quarter ended March 31, 2026, we recognized $9.7 million of transaction-related costs primarily within Selling, General and Administrative expenses ("SG&A") in our unaudited Condensed Consolidated Statements of Income (the "Income Statements"). As of March 31, 2026, we have accrued approximately $19 million of transaction-related costs that will be paid upon closing. We expect to incur additional costs relating to the proposed Merger, such as financial advisory, legal, accounting, retention bonuses, and other professional services fees.