Quanterix Corporation

QTRX • NASDAQ

Quanterix Corporation is a medical - devices company in the healthcare sector on NASDAQ, led by Masoud Toloue, with a market cap of $353.1M. As of Q3 2025, 77% of shares are held by 128 institutional investors, with Portolan Capital Management, LLC as the largest holder at 9.17%.

President and Chief Executive OfficerMasoud Toloue

Market Cap$353.1M

Medical - Devices

Healthcare

Employees141.0

Websitequanterix.com

Country

United States of America

Overview

Overview of institutional ownership in QTRX as of Q3 2025 with a market cap of $252.3M

All Institutions

Institutions: 128
Value Held: $193.7M
Shares Held: 35.7M
Avg Position: $1.5M
Median Position: $151.0K

Hedge Funds

Hedge Funds: 20
Value Held: $53.6M
Shares Held: 9.9M
Avg Position: $2.7M
Median Position: $609.9K

Ownership Breakdown

Institutional (non-HF)

55.5%

$140.0M

Hedge Funds

21.26%

$53.6M

Retail & Other

23.24%

$58.6M

Based on market cap of $252.3M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in QTRX as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
Portolan Capital Management, LLC Hedge Fund•Long/Short	George Frederic Mccabe CIO	$23.1M 1.25% of portfolio	9.17% 4.3M shares	Q2 2022 Held for 3y 5m	$1.8B
AMERIPRISE FINANCIAL INC Institution	Jim Cracchiolo CEO	$23.0M 0.01% of portfolio	9.13% 4.2M shares	Q4 2018 Held for 6y 11m	$433.11B
B BlackRock, Inc. Institution	-	$16.9M 0.00% of portfolio	6.70% 3.1M shares	Q1 2018 Held for 7y 8m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$14.4M 0.00% of portfolio	5.70% 2.6M shares	Q4 2017 Held for 7y 11m	$6.69T
I Invenomic Capital Management LP Hedge Fund•Long/Short	Benjamin Robert Deschaine President	$7.6M 0.39% of portfolio	3.00% 1.4M shares	Q1 2025 Held for 8 months	$1.9B
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Long Only Manager	Brent Walker Gledhill CEO	$7.1M 0.02% of portfolio	2.83% 1.3M shares	Q4 2024 Held for 11 months	$38.7B
Levin Easterly Partners LLC Long Only Manager	Darrell William Crate Chairman	$6.8M 0.46% of portfolio	2.69% 1.3M shares	Q4 2023 Held for 1y 11m	$1.5B
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	Dan Michael Berkovitz Chairman	$6.6M 0.01% of portfolio	2.60% 1.2M shares	Q4 2017 Held for 7y 11m	$121.98B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$5.5M 0.00% of portfolio	2.18% 1.0M shares	Q1 2018 Held for 7y 8m	$1.57T
K Kent Lake PR LLC Hedge Fund•Long/Short	Benjamin Natter Managing Partner	$5.4M 2.78% of portfolio	2.15% 1.0M shares	Q3 2024 Held for 1y 2m	$195.5M

Net Capital Flow

Institutional buying and selling activity for QTRX in Q3 2025

Traded: +$3.5M
Buyers: 65
Sellers: 62
Total Bought: +$28.9M
Total Sold: −$25.4M
Avg Position: $1.3M

Biggest Buyers

Institution	Net Bought	Current Position
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$6.5M +1.2M shares	$6.6M 1.2M shares
Portolan Capital Management, LLC Hedge Fund•Long/Short	+$3.4M +626.2K shares	$23.1M 4.3M shares
E Empire Financial Management Company, LLC RIA/Wealth	+$1.8M +328.5K shares	$2.5M 452.4K shares
ENVESTNET ASSET MANAGEMENT INC Long Only Manager	+$1.5M +284.3K shares	$2.8M 515.9K shares
I Invenomic Capital Management LP Hedge Fund•Long/Short	+$1.3M +248.1K shares	$7.6M 1.4M shares
C Cubist Systematic Strategies, LLC Institution	+$1.1M +196.4K shares	$1.7M 314.4K shares
B BlackRock, Inc. Institution	+$1.0M +188.3K shares	$16.9M 3.1M shares
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Long Only Manager	+$1.0M +187.3K shares	$7.1M 1.3M shares
I IRONWOOD INVESTMENT MANAGEMENT LLC Long Only Manager	+$938.2K +172.8K shares	$1.1M 194.1K shares
Levin Easterly Partners LLC Long Only Manager	+$915.2K +168.5K shares	$6.8M 1.3M shares

Biggest Sellers

Institution	Net Sold	Current Position
K Kent Lake PR LLC Hedge Fund•Long/Short	−$7.1M −1.3M shares	$5.4M 1.0M shares
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$5.1M −767.8K shares	Sold Off 0 shares
B BAILLIE GIFFORD & CO Institution	−$4.0M −600.8K shares	Sold Off 0 shares
Parkman Healthcare Partners LLC Hedge Fund•Long/Short	−$1.4M −263.8K shares	$1.4M 252.2K shares
SCS Capital Management LLC RIA/Wealth	−$1.3M −234.3K shares	$651.8K 120.0K shares
Schonfeld Strategic Advisors LLC Hedge Fund•Multi-Strategy	−$1.0M −189.1K shares	$741.6K 136.6K shares
Valmark Advisers, Inc. RIA/Wealth	−$700.8K −105.4K shares	Sold Off 0 shares
RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant	−$686.3K −103.2K shares	Sold Off 0 shares
DIMENSIONAL FUND ADVISORS LP Long Only Manager	−$524.8K −96.7K shares	$3.8M 707.1K shares
STATE OF WISCONSIN INVESTMENT BOARD RIA/Wealth	−$510.4K −94.0K shares	$1.1M 195.8K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited QTRX in Q3 2025

New Positions: 8
New Value: $312.2K
Exited Positions: 25
Exited Value: $11.8M

New Positions

Institution	Position Value
P PharVision Advisers, LLC Hedge Fund•Long/Short	$196.3K 36.1K shares
Atom Investors LP Hedge Fund•Market Neutral	$106.3K 19.6K shares
O Optiver Holding B.V. Institution	$4.0K 729.0 shares
Transamerica Financial Advisors, Inc. Institution	$3.1K 563.0 shares
SIT INVESTMENT ASSOCIATES INC Long Only Manager	$1.0K 272.0 shares
Hartland & Co., LLC RIA/Wealth	$717.0 132.0 shares
North Star Investment Management Corp. RIA/Wealth	$543.0 100.0 shares
J JONES FINANCIAL COMPANIES LLLP Institution	$379.0 73.0 shares

Exited Positions

Institution	Previous Position
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$5.1M 767.8K shares
B BAILLIE GIFFORD & CO Institution	$4.0M 600.8K shares
Valmark Advisers, Inc. RIA/Wealth	$700.8K 105.4K shares
RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant	$686.3K 103.2K shares
Boussard & Gavaudan Investment Management LLP Hedge Fund•Multi-Strategy	$456.9K 71.7K shares
C CREDIT INDUSTRIEL ET COMMERCIAL Institution	$232.8K 35.0K shares
Janney Capital Management LLC RIA/Wealth	$215.2K 32.4K shares
S Squarepoint Ops LLC Hedge Fund•Quant	$102.2K 15.4K shares
Moors & Cabot, Inc. RIA/Wealth	$96.1K 14.5K shares
ING INVESTMENT MANAGEMENT LLC Insurance Manager	$67.5K 10.2K shares

Options Activity

Institutions with the largest Call and Put options positions in QTRX as of Q3 2025

Call Positions: 1
Call Value: $57.6K
Put Positions: 1
Put Value: $74.9K

Call Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$57.6K 106.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$74.9K 138.0 contracts

Most Committed Institutions

Institutions with QTRX as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
Blue Water Life Science Advisors, LLC RIA/Wealth	Nathaniel Thomas Cornell Managing Partner	4.74% $5.2M	2.06% 957.7K shares	Q4 2023 Held for 1y 11m	$109.6M
K Kent Lake PR LLC Hedge Fund•Long/Short	Benjamin Natter Managing Partner	2.78% $5.4M	2.15% 1.0M shares	Q3 2024 Held for 1y 2m	$195.5M
Trium Capital LLP Hedge Fund•Multi-Strategy	Shenan Nmn Dhanani CEO	1.47% $3.7M	1.48% 688.6K shares	Q1 2025 Held for 8 months	$254.9M
Portolan Capital Management, LLC Hedge Fund•Long/Short	George Frederic Mccabe CIO	1.25% $23.1M	9.17% 4.3M shares	Q2 2022 Held for 3y 5m	$1.8B
P PARAGON ASSOCIATES & PARAGON ASSOCIATES II JOINT VENTURE Institution	-	0.97% $546.6K	0.22% 100.7K shares	Q1 2025 Held for 8 months	$56.1M
T Tikvah Management LLC Institution	-	0.94% $3.1M	1.23% 571.6K shares	Q4 2018 Held for 6y 11m	$330.6M
E Empire Financial Management Company, LLC RIA/Wealth	Anthony V Manory CIO	0.56% $2.5M	0.97% 452.4K shares	Q4 2023 Held for 1y 11m	$436.5M
I IRONWOOD INVESTMENT MANAGEMENT LLC Long Only Manager	Donald Collins Managing Partner	0.46% $1.1M	0.42% 194.1K shares	Q2 2025 Held for 5 months	$227.0M
Levin Easterly Partners LLC Long Only Manager	Darrell William Crate Chairman	0.46% $6.8M	2.69% 1.3M shares	Q4 2023 Held for 1y 11m	$1.5B
I Invenomic Capital Management LP Hedge Fund•Long/Short	Benjamin Robert Deschaine President	0.39% $7.6M	3.00% 1.4M shares	Q1 2025 Held for 8 months	$1.9B

Hedge Fund Spotlight

Discover hedge funds investing in QTRX

TWO SIGMA INVESTMENTS LLC

Hedge Fund • Multi-Strategy

Portfolio ManagerScott David Hoffman

Portfolio Value: $62.0B
Positions: 3,252
Last Reported: Q3 2025

Sector Allocation

Position in Quanterix Corporation

Market Value: $1.4M
Shares Held: 250.1K
Portfolio Weight: 0.00%
Owned Since: 2024-Q4

Top Holding	Sector	Market Value	Weight
1 SPDR S&P 500 ETF Trust SPY	ETF ETF	$680.4M	1.10%
2 Financial Select Sector SPDR Fund XLF	ETF ETF	$582.6M	0.94%
3 Consumer Staples Select Sector SPDR Fund XLP	ETF ETF	$489.6M	0.79%