SCHEDULE: Telegraph Hill Partners Discloses 5.4% Stake in Quanterix

Telegraph Hill Partners and its affiliates have reported a 5.4% beneficial ownership stake in Quanterix Corp, totaling 2,504,648 shares of common stock.

Summary

• Telegraph Hill Partners III, L.P., THP III Affiliates Fund, LLC, Telegraph Hill Partners III Investment Management, LLC, and Telegraph Hill Partners Management Company, LLC (collectively, the "Reporting Persons") have filed a Schedule 13G.
• The Reporting Persons collectively beneficially own 2,504,648 shares of Quanterix Corp common stock.
• This ownership represents 5.4% of Quanterix Corp's outstanding common stock.
• The total outstanding shares of Common Stock of the Issuer were 46,710,797 on November 4, 2025.
• Telegraph Hill Partners III, L.P. holds 2,258,408 shares, and THP III Affiliates Fund, LLC holds 246,240 shares.
• All Reporting Persons share both voting and dispositive power over the 2,504,648 shares.
• The filing certifies that the securities were not acquired for the purpose of changing or influencing control of Quanterix Corp.

Sentiment

Score: 5

Explanation: The filing is a standard beneficial ownership disclosure (Schedule 13G), indicating a passive investment. It is neutral in sentiment as it does not contain performance data, forward-looking statements, or significant corporate actions beyond the ownership disclosure itself.

Future Outlook

NA

Industry Context

This filing indicates a significant, passive investment by a private equity firm specializing in healthcare and life sciences, suggesting confidence in Quanterix Corp's long-term prospects within the diagnostics and life sciences tools sector. Such disclosures are common and typically do not signal immediate strategic shifts unless the stake approaches activist levels or is accompanied by other communications.

Stakeholder Impact

• Shareholders: Provides transparency regarding a significant institutional holder, potentially offering a signal of investor confidence in the company's long-term value. No immediate operational or strategic impact is indicated.

Key Dates

Keywords

Quanterix Corp, Telegraph Hill Partners, Beneficial Ownership, Schedule 13G, Common Stock, Institutional Ownership, Investment Management