Are insiders buying or selling Zenas BioPharma, Inc. stock?

Based on the last 50 SEC Form 4 filings, Zenas BioPharma, Inc. insiders made 25 open-market purchases and 0 open-market sales.

Where can I see Zenas BioPharma, Inc. insider trading activity?

SEC Form 4 filings for Zenas BioPharma, Inc. (ZBIO) are publicly available on EDGAR and aggregated at form4api.com/companies/zbio.

Company profile

Zenas BioPharma, Inc. Insider Trading

Name: Zenas BioPharma, Inc. Insider Trading Data
Creator: Form4API
License: https://www.sec.gov/privacy.htm

ZBIO

Every SEC Form 4 insider trading filing for Zenas BioPharma, Inc. (ZBIO) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?

Exchange: Nasdaq
Sector: Pharmaceutical Preparations
CIK: 0001953926
Filings: 65
Insiders: 22
Last filing: 2026-09-01

SEC EDGAR ↗Yahoo Finance ↗Finviz ↗Stock Analysis ↗

Activity summary

Recent insider activity is bullish. Over the last 30 days, 1 insider purchased shares. Buying was led by Christy J. Oliger.

Three year balance

Buy and sell value by quarter, Q3 24 to Q3 26. Zenas BioPharma, Inc. insiders are net buyers across the period shown.

PurchasesSales

Bars below the rule are sales, above are purchases. Largest quarter on the chart is $82.9M.

90 day insight

Over the last 90 days, Zenas BioPharma, Inc. insiders bought $0 across 1 transaction with no open-market sales.

Most active insider: Christy J. Oliger with 1 transaction totaling $0.

Activity skews bullish — buys outpace sales.

Insider Transactions

Sourced from SEC EDGAR Form 4 filings. Updated hourly.

Date	Insider	Company	Type	Shares	Price	Value	Return
Sep 1, 2026	Christy J. Oliger	ZBIO	Award	37,000	—	—	-6.1% 1w
Jun 15, 2026	Hongbo Lu	ZBIO	Award	18,500	—	—	+72.1% 3m
Jun 15, 2026	Moltke Lisa von	ZBIO	Award	150,000	—	—	+72.1% 3m
Jun 15, 2026	James P Boylan	ZBIO	Award	18,500	—	—	+72.1% 3m
Jun 15, 2026	Patricia L Allen	ZBIO	Award	18,500	—	—	+72.1% 3m

45 more transactions hidden

Free account · No credit card required

Building something? Get API access →

Query this yourself

The same rows, over the API.

curl "https://api.form4api.com/v1/transactions?ticker=ZBIO" \
  -H "X-Api-Key: $KEY"

Get a key

Top insiders

By total value filed.

Fairmount Funds Management LLC2 filings+$9.0M

Hongbo LuDirector4 filings+$7.2M

Leon O Moulder JrSee Remarks10 filings+$6.5M

SR ONE CAPITAL MANAGEMENT, LLC10% owner2 filings+$2.4M

Patrick G EnrightDirector2 filings+$2.3M

Institutional Ownership

Top 13F-HR holders of Zenas BioPharma, Inc. as of 2026-06-30

↓ decreasing

Total reported AUM

$189.3M

QoQ change

-82.5%

Reporting period

2026-06-30

State Street Corp

CIK 0000093751

$52.2M

2.1M shares

Nvp Associates, LLC

CIK 0001545692

$46.7M

1.8M shares

BlackRock, Inc.

CIK 0002012383

$36.2M

1.4M shares

Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →