Are insiders buying UPB stock?

Yes — 3 distinct insiders have bought UPB (Upstream Bio, Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was Oct 17, 2024.

How much UPB stock have insiders bought?

Insiders have bought a combined $48.0M of UPB across 5 open-market purchases, based on SEC Form 4 filings.

What is an insider cluster buy in UPB?

A cluster buy is two or more distinct Upstream Bio, Inc. insiders — officers, directors, or 10% owners — each buying UPB on the open market within a rolling window. UPB has 1 detected cluster buy to date.

Where does this UPB insider trading data come from?

Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

UPB insider buying

1 cluster buy

Upstream Bio, Inc. · Healthcare

When two or more insiders at Upstream Bio, Inc. buy UPB on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in UPB plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.

Clusters

Distinct insiders

Total bought

$48.0M

Market cap

$396.2M

Detected clusters

Oct 15 – Oct 15, 2024
Detected Oct 15, 2024
3 insiders
Total bought
$48.0M
Market cap
$396.2M

All notable open-market buys in UPB

Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.

Date	Insider	Shares	Price	Value	Filing
Oct 15, 2024	Access Industries Holdings LLCcluster 10% Owner	1,175,000	$17.00	$20.0M	SEC ↗
Oct 15, 2024	ORBIMED ADVISORS LLCcluster Director, 10% Owner	660,000	$17.00	$11.2M	SEC ↗
Oct 15, 2024	Chimovits Erezcluster Director, 10% Owner	660,000	$17.00	$11.2M	SEC ↗
Oct 15, 2024	ORBIMED ADVISORS LLCcluster Director, 10% Owner	165,000	$17.00	$2.8M	SEC ↗
Oct 15, 2024	Chimovits Erezcluster Director, 10% Owner	165,000	$17.00	$2.8M	SEC ↗

More Healthcare stocks with insider cluster buys

All insider buying in Healthcare →

UPB insider buying — FAQ

Are insiders buying UPB stock?: Yes — 3 distinct insiders have bought UPB (Upstream Bio, Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was Oct 17, 2024.
How much UPB stock have insiders bought?: Insiders have bought a combined $48.0M of UPB across 5 open-market purchases, based on SEC Form 4 filings.
What is an insider cluster buy in UPB?: A cluster buy is two or more distinct Upstream Bio, Inc. insiders — officers, directors, or 10% owners — each buying UPB on the open market within a rolling window. UPB has 1 detected cluster buy to date.
Where does this UPB insider trading data come from?: Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

How we track insider buying in UPB

We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy UPB within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?

This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding UPB.