Are insiders buying ETNB stock?

Yes — 3 distinct insiders have bought ETNB (89bio, 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 Feb 3, 2025.

How much ETNB stock have insiders bought?

Insiders have bought a combined $50.3M of ETNB across 6 open-market purchases, based on SEC Form 4 filings.

What is an insider cluster buy in ETNB?

A cluster buy is two or more distinct 89bio, Inc. insiders — officers, directors, or 10% owners — each buying ETNB on the open market within a rolling window. ETNB has 1 detected cluster buy to date.

Where does this ETNB 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.

ETNB insider buying

1 cluster buy

89bio, Inc. · Healthcare

When two or more insiders at 89bio, Inc. buy ETNB 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 ETNB 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

$50.3M

Market cap

$2.3B

Detected clusters

Nov 22, 2024 – Jan 30, 2025
Detected Jan 30, 2025
High conviction3 insiders
Total bought
$50.3M
Market cap
$2.3B

All notable open-market buys in ETNB

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
Jan 30, 2025	Kolchinsky Petercluster Director, 10% Owner	5,714,285	$8.75	$50.0M	SEC ↗
Jan 22, 2025	McWherter Charlescluster Director	10,000	$6.71	$67.1K	SEC ↗
Jan 21, 2025	McWherter Charlescluster Director	5,000	$6.55	$32.8K	SEC ↗
Dec 6, 2024	PALEKAR ROHANcluster Director, Chief Executive Officer	5,000	$7.89	$39.5K	SEC ↗
Dec 5, 2024	McWherter Charlescluster Director	10,000	$8.00	$80.0K	SEC ↗
Nov 22, 2024	PALEKAR ROHANcluster Director, Chief Executive Officer	10,000	$8.35	$83.5K	SEC ↗

More Healthcare stocks with insider cluster buys

All insider buying in Healthcare →

ETNB insider buying — FAQ

Are insiders buying ETNB stock?: Yes — 3 distinct insiders have bought ETNB (89bio, 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 Feb 3, 2025.
How much ETNB stock have insiders bought?: Insiders have bought a combined $50.3M of ETNB across 6 open-market purchases, based on SEC Form 4 filings.
What is an insider cluster buy in ETNB?: A cluster buy is two or more distinct 89bio, Inc. insiders — officers, directors, or 10% owners — each buying ETNB on the open market within a rolling window. ETNB has 1 detected cluster buy to date.
Where does this ETNB 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 ETNB

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 ETNB 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 ETNB.