There are currently 135 tracked institutional investors and hedge funds holding shares of QTRX (Quanterix CORP).

What is the latest 13F net institutional activity for QTRX?

In the latest filing period, net institutional position change for QTRX was +$11.1M.

What is the popularity rank of QTRX among institutional investors?

QTRX is ranked #3940 out of 37696 tracked stocks by institutional holder count on AlphaSMO.

QTRX

Quanterix CORP (QTRX) 13F Filings: Institutional Buyers & Sellers (Q2 2026)

Quanterix CORP

$2.87-6.5%

+$11.1M

Net Activity

-17.67% total shares

Institutions Holding

135

Popularity Rank

#3940

Avg Weight

0.11%

Total Value

$130.3M

Market Cap

$122.4M

Data as ofJun 2026

Ownership Trend

135 institutions currently hold QTRX, with 89 net buyers and 62 net sellers this quarter.

Institutional Moves

Institutional Moves (Q2 2026)

Majority Increased

Based on recent trading activity

Net Selling Institutions

Net Buying Institutions

Note: Data on this page is curated by the AlphaSMO team. AlphaSMO is the web's most authoritative 13F / Inside Trader database, dedicated to providing accurate insider trading and institutional portfolio reports. Please credit the source when reposting.

Who Owns QTRX? Top Institutional & Hedge Fund Holders

Key Holders

Top 5 by Value

BlackRock, Inc.

$15.7M

Blue Water Life Science Advisors, LP

$15.0M

First Eagle Investment Management, LLC

$11.9M

Portolan Capital Management, LLC

$8.2M

Vanguard Capital Management LLC

$7.8M

Top 5 by Conviction

Blue Water Life Science Advisors, LP

9.45%

Lionhunter Capital Management, LLC

2.92%

Tikvah Management LLC

0.75%

Portolan Capital Management, LLC

0.31%

Ironwood Investment Management LLC

0.25%

Source and citation information

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View all 135 holding institutions

Across its top 20 institutional holders, QTRX's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 12/100, avg. turnover score 33/100).

Notable Holders

QTRX ranks #3940 out of 37696 tracked stocks by institutional interest, inside the more closely watched half of our coverage.

QTRX is a top-conviction position for Blue Water Life Science Advisors, LP — at 9.4% of their entire disclosed 13F portfolio, it's one of their largest single bets, not just a passing allocation.

The largest dollar stake in QTRX belongs to BlackRock, Inc., but the position matters far more to Blue Water Life Science Advisors, LP, who has 9.4% of their own portfolio riding on it — a reminder that the biggest holder by size and the holder with the biggest bet aren't always the same fund.

Essential Partners LLC has trimmed its QTRX position for two straight quarters, cutting it by $5.0K while still holding $1.0K.

QTRX is down 6.5% today, but institutions show net buying of $11.1M this quarter — a divergence between today's price move and the underlying institutional flow.

Company Fundamentals

QTRX reported a net loss of $123.1M over the trailing twelve months.

Not yet profitable — net loss of $123.1M over the trailing twelve months
Revenue grew 22.0% year over year
Net income declined year over year, from -$70.5M to -$123.1M
Operating cash flow was negative, using $77.2M in cash
Current ratio of 2.84x — enough short-term assets to cover short-term liabilities
Liabilities run 0.42x equity — within a conventional range

Price Chart

QTRX Quarterly 13F Institutional Trade Shifts

Recent Activity

+$44.8M

Total Buy Value

$64.5M

Total Sell Value

New buy40

Trim29

Add49

Sold out33

Net Buyers

Net Sellers

Top Movers

QTRX

Q2 2026

Top 5 Institutional Movers

Ameriprise Financial

-$8.2M

Trim

Blue Water Life Science Advisors, LP

+$7.5M

Add

William Blair Investment Management

-$7.3M

Sold out

First Eagle Investment Management

+$7.3M

Add

Invenomic Capital Management LP

-$6.8M

Sold out

Data by AlphaSMO • Not financial advice.

Smart Money Convergence

QTRX does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.

13F data as of 2026-09-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.

Recent QTRX Insider Buying & Selling Activity (Form 4)

Congress Trading (STOCK Act)

Form 144 Pre-Sale Notices

No Form 144 planned sale filings in the last 90 days

Beneficial Ownership (13D/13G)

Active 5%+ Holders

Data as of 2026-08-14

Reporting Person	Type	Filing Date	Shares	% of Class
Portolan Capital Management, LLC	13G/A	2026-08-14	1.90M	4.0%

View all Schedule 13D/13G filings

Material Events (8-K)

Filings (14d)

Data as of 2026-08-10

2026-08-10

Quanterix Corp filed this 8-K on August 10, 2026 to flag that it had published its earnings release for the second fiscal quarter ended June 30, 2026. The actual numbers aren't spelled out in this filing itself — they're in the press release attached as Exhibit 99.1 — so this 8-K is essentially a formal "heads up" that the earnings are out. Note that the materials were "furnished" rather than "filed," which is the standard treatment for earnings announcements.

View Full Filing (SEC EDGAR)

View all Form 8-K filings

CUSIP

74766Q101

FAQ

Who are the top institutional investors holding QUANTERIX CORP (QTRX)?

Major stakeholders currently include BlackRock, Inc. ($15.7M), Blue Water Life Science Advisors, LP ($15.0M), First Eagle Investment Management, LLC ($11.9M). Based on the latest 13F filings, there are a total of 135 tracked investment funds and institutions maintaining positions in QTRX.

What is the overall institutional sentiment toward QTRX recently?

Institutional sentiment appears Bullish (Net Buying). During the most recent reporting quarter, the stock experienced a net inflow of $11.1M, driven by 89 managers accumulating shares while 62 reduced their exposure.

Which institutions have been selling or reducing their QTRX positions?

In the latest period, 29 funds trimmed their holdings, and 33 managers completely exited their positions. The aggregate reported sell value was $64.5M.

Are there any notable investors adding QTRX to their portfolios?

Yes, buying activity remains notable. 40 institutions opened new positions in {ticker}, and 49 existing holders added to their shares. The total reported buy value for the quarter amounted to $44.8M.

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Developer Access

Access QTRX's institutional ownership data programmatically:

REST API

curl https://alphasmo.com/api/v1/market/stock/QTRX

CLI

npx alphasmo stocks get QTRX

Full API & MCP documentation →

Reporting Person

Type

Filing Date

% of Class

Portolan Capital Management, LLC

13G/A

2026-08-14

4.0%