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Quanterix
QTRX · listed on Nasdaq · worth $143.77 million
$3.04
+3.40% today
Three insider buys in the last year, $296K in all. None in the last two weeks.
Green dot = an insider bought◆ = company newsA number = that many on nearby days · click a mark to see who, or read the filing
The shares anyone can buy and sell, leaving out those held by insiders and big long-term owners.
38.0M shares
80% of all shares
Shares borrowed and sold by investors who expect the price to drop.
Company insiders
In the last year, two insiders bought Quanterix stock and none sold.
How each buyer's earlier purchases went: the stock about six months later, beside the S&P 500 over the same days. Purchases planned in advance are left out. Past results, not a forecast.
Director
William P. Donnelly
Bought $211.7K on Aug 13 — 72,245 shares at $2.93, held through a trust or family, 73% of what they now own.
1 of 1 earlier purchase did better than the S&P 500
Chief Commercial Officer
Benjamin Meadows
Bought $9.7K on May 12 — 3,500 shares at $2.77, 100% of what they now own.
0 of 1 earlier purchase did better than the S&P 500
Big investors
People and funds that reported owning 5% or more of Quanterix, newest first.
Filed by someone who owns 5% or more and does not plan to influence the company. · updatePortolan Capital Management4.0%Aug 14
All reports
Every insider trade and SEC report we hold for Quanterix.
Newest first
ReportedTradeInsiderOf their holdingShares @ priceValue
Aug 14BoughtWilliam P. DonnellyAug 14 · Traded Aug 13 · Director+73%via a trust or family72,245 @ $2.93$211.7K
Aug 14BoughtWilliam P. DonnellyAug 14 · Traded Aug 12 · Director+100%via a trust or family27,155 @ $2.75$74.7K
Jun 12BoughtBenjamin MeadowsJun 12 · Traded May 12 · Chief Commercial Officer+100%3,500 @ $2.77$9.7K
Sep 17, 2025BoughtVandana SriramSep 17, 2025 · Traded Sep 12, 2025 · Chief Financial Officer+4.8%4,150 @ $4.79$19.9K
5 more with Pro →Analysts, earnings and news
Analysts' price target
$3.33 average
3 analysts
Analysts' opinions, which tend to run optimistic. Not our forecast or advice.
Profit vs what was expected
2 of 5 quarters above
Q2 '26−$1.04 a share−$0.63
Q1 '26$0.16 a share+$0.78
Q4 '25−$0.47 a share+$0.01
Q3 '25−$0.73 a share−$0.20