In the first quarter of 2026, the Board of Directors approved an increase of 2.0 million shares of common stock to be reserved for issuance under the Amended and Restated 2025 Inducement Plan (the "Inducement Plan"). The Inducement Plan allows for issuance of up to 2.9 million shares of Quanterix common stock. The only persons eligible to receive grants of stock-based awards under the Inducement Plan are individuals who satisfy the standards for inducement grants under Nasdaq Listing Rule 5635(c)(4).

RSUs represent the right to receive shares of common stock based on continued employment during the vesting period, which is generally four years. Shares are delivered to the grantee upon vesting, less shares for the payment of withholding taxes. PSUs represent the right to receive shares of common stock based on the achievement of performance or market conditions and continued employment during the vesting period.

During the six months ended June 30, 2026, the Company granted 4.9 million RSUs, which had a weighted average grant date fair value of $5.95 per share, and granted 1.2 million PSUs, which had a weighted average grant date fair value of $5.62 per share. During the three months ended June 30, 2026, RSU grants were not material and no PSUs were granted.

For PSUs granted during the six months ended June 30, 2026, 0.8 million contained market vesting conditions that are based on the Company's volume weighted share price exceeding pre-set prices over a four year performance period. For the 0.4 million PSUs granted containing performance vesting conditions, the number of shares issuable at the end of the

one year performance period could be up to 125% of the granted award based on the Company's performance against pre-set objectives.

RSUs and PSUs vested or forfeited during the three and six months ended June 30, 2026 were not material.

Stock-based compensation expense was recorded in the following categories on the Consolidated Statements of Operations (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Cost of product revenue	$	243	$	262	$	398	$	573
Cost of service and other revenue	217		240		431		550
Research and development	750		553		1,275		1,144
Selling, general and administrative	3,002		4,318		6,635		8,567
Total stock-based compensation expense	$	4,212	$	5,373	$	8,739	$	10,834

As of June 30, 2026, total unrecognized stock-based compensation expense related to unvested RSUs, PSUs, and stock options was $35.9 million, which is expected to be recognized over the remaining weighted-average vesting period of 2.8 years.