Commitments and Contingencies	9 Months Ended
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies Operating Leases There have been no material changes to the Company’s leases during the nine months ended September 30, 2025. For additional information, please read Note 12 Leases, to the consolidated financial statements in the Company’s Form 10-K for the year ended December 31, 2024. 401(k) Savings Plan The Company has a defined-contribution savings plan under Section 401(k) of the Internal Revenue Code. This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their compensation on a pre-tax basis. Company contributions to the plan may be made at the discretion of the board of directors. Effective January 1, 2023, the Company instituted an employer matching program for the plan pursuant to which the Company will match 100% of the first 3% of each participating employee’s eligible compensation contributed to the plan and 50% of up to an additional 2% each participating employee’s eligible compensation contributed to the plan. For the three and nine months ended September 30, 2025, the Company recorded expense of $1.0 million and $3.0 million, respectively, related to these matching contributions. For the three and nine months ended September 30, 2024, the Company recorded expense of $0.9 million and $2.5 million, respectively, related to these matching contributions. Indemnification Agreements In the ordinary course of business, the Company may provide indemnification of varying scope and terms to customers, vendors, lessors, business partners, and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements, negligence or willful misconduct, or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or services as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. To date, the Company has not incurred any material costs as a result of such indemnifications. The Company is not currently aware of any indemnification claims and had not accrued any liabilities related to such obligations in its condensed consolidated financial statements as of September 30, 2025 and December 31, 2024. Unconditional Purchase Commitment In January 2021, the Company entered into an unconditional $9.5 million purchase commitment, in the ordinary course of business, for goods with specified annual minimum quantities to be purchased through December 2029. The contract is not cancellable without penalty. The remaining purchase commitment as of September 30, 2025 was $5.0 million. Legal Proceedings On February 14, 2025, a class action captioned Jewik v. TransMedics Group, Inc., et al., Case No. 1:25-cv-10385, was filed against the Company and certain of its current and former officers in the United States District Court for the District of Massachusetts. The complaint purported to assert claims pursuant to Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 (the “Exchange Act”), as amended, and SEC Rule 10b-5 promulgated thereunder, seeking unspecified damages on behalf of a putative class of investors who purchased or otherwise acquired the Company’s shares between February 28, 2023 and January 10, 2025 (the “Class Period”). On April 2, 2025, another purported stockholder filed a putative class action lawsuit against the Company and certain of its current and former officers, also in the United States District Court for the District of Massachusetts (Collins v. TransMedics Group, Inc., et al., Case No. 1:25-cv-10778). The Collins complaint alleged claims substantially similar to those alleged in the Jewik action and also sought unspecified damages. On May 22, 2025, the court consolidated the Jewik and Collins actions and appointed the Peace Officers’ Annuity and Benefit Fund of Georgia and Oguzhan Altun as lead plaintiffs (the “Lead Plaintiffs”). On August 8, 2025, the Lead Plaintiffs filed a consolidated amended complaint. Like the earlier-filed complaints, the amended complaint purports to assert claims pursuant to Sections 10(b) and 20(a) of the Exchange Act and Rule 10b-5, on behalf of a putative class of investors who purchased or otherwise acquired the Company’s shares during the Class Period. Lead Plaintiffs seek unspecified damages allegedly caused by purported misstatements and omissions contained in our 2022 Annual Report, certain earnings calls, and other public statements. The amended complaint claims these alleged statements and omissions operated to artificially inflate the price paid for our common stock during the Class Period. On October 7, 2025, defendants filed a motion to dismiss the amended complaint for failure to state a claim. Lead Plaintiffs’ response to the motion is due November 21, 2025, and defendants’ reply brief is due December 22, 2025. The Company cannot anticipate when the court will rule on that motion. At each reporting date, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies. At this time, the Company is unable to predict the outcome of the class action litigation or reasonably estimate a range of possible losses. The Company expenses as incurred the costs related to such legal proceedings.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2025

Commitments and Contingencies Disclosure [Abstract]

10. Commitments and Contingencies

Operating Leases

There have been no material changes to the Company’s leases during the nine months ended September 30, 2025. For additional information, please read Note 12 Leases, to the consolidated financial statements in the Company’s Form 10-K for the year ended December 31, 2024.

401(k) Savings Plan

The Company has a defined-contribution savings plan under Section 401(k) of the Internal Revenue Code. This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their compensation on a pre-tax basis. Company contributions to the plan may be made at the discretion of the board of directors. Effective January 1, 2023, the Company instituted an employer matching program for the plan pursuant to which the Company will match 100% of the first 3% of each participating employee’s eligible compensation contributed to the plan and 50% of up to an additional 2% each participating employee’s eligible compensation contributed to the plan. For the three and nine months ended September 30, 2025, the Company recorded expense of $1.0 million and $3.0 million, respectively, related to these matching contributions. For the three and nine months ended September 30, 2024, the Company recorded expense of $0.9 million and $2.5 million, respectively, related to these matching contributions.

Indemnification Agreements

In the ordinary course of business, the Company may provide indemnification of varying scope and terms to customers, vendors, lessors, business partners, and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements, negligence or willful misconduct, or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or services as directors or officers.

The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. To date, the Company has not incurred any material costs as a result of such indemnifications. The Company is not currently aware of any indemnification claims and had not accrued any liabilities related to such obligations in its condensed consolidated financial statements as of September 30, 2025 and December 31, 2024.

Unconditional Purchase Commitment

In January 2021, the Company entered into an unconditional $9.5 million purchase commitment, in the ordinary course of business, for goods with specified annual minimum quantities to be purchased through December 2029. The contract is not cancellable without penalty. The remaining purchase commitment as of September 30, 2025 was $5.0 million.

Legal Proceedings

On February 14, 2025, a class action captioned Jewik v. TransMedics Group, Inc., et al., Case No. 1:25-cv-10385, was filed against the Company and certain of its current and former officers in the United States District Court for the District of Massachusetts. The complaint purported to assert claims pursuant to Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 (the “Exchange Act”), as amended, and SEC Rule 10b-5 promulgated thereunder, seeking unspecified damages on behalf of a putative class of investors who purchased or otherwise acquired the Company’s shares between February 28, 2023 and January 10, 2025 (the “Class Period”). On April 2, 2025, another purported stockholder filed a putative class action lawsuit against the Company and certain of its current and former officers, also in the United States District Court for the District of Massachusetts (Collins v. TransMedics Group, Inc., et al., Case No. 1:25-cv-10778). The Collins complaint alleged claims substantially similar to those alleged in the Jewik action and also sought unspecified damages. On May 22, 2025, the court consolidated the Jewik and Collins actions and appointed the Peace Officers’ Annuity and Benefit Fund of Georgia and Oguzhan Altun as lead plaintiffs (the “Lead Plaintiffs”).

On August 8, 2025, the Lead Plaintiffs filed a consolidated amended complaint. Like the earlier-filed complaints, the amended complaint purports to assert claims pursuant to Sections 10(b) and 20(a) of the Exchange Act and Rule 10b-5, on behalf of a putative class of investors who purchased or otherwise acquired the Company’s shares during the Class Period. Lead Plaintiffs seek unspecified damages allegedly caused by purported misstatements and omissions contained in our 2022 Annual Report, certain earnings calls, and other public statements. The amended complaint claims these alleged statements and omissions operated to artificially inflate the price paid for our common stock during the Class Period. On October 7, 2025, defendants filed a motion to dismiss the amended complaint for failure to state a claim. Lead Plaintiffs’ response to the motion is due November 21, 2025, and defendants’ reply brief is due December 22, 2025. The Company cannot anticipate when the court will rule on that motion.

At each reporting date, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies. At this time, the Company is unable to predict the outcome of the class action litigation or reasonably estimate a range of possible losses. The Company expenses as incurred the costs related to such legal proceedings.