Zenas BioPharma, Inc. (ZBIO) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-06-17

Zenas BioPharma, Inc. (ZBIO) has filed 12 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-17. 1 Form 8-K material event filings were reported by ZBIO in the last 90 days. InsiderAlpha tracks every ZBIO SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About Zenas BioPharma, Inc. (ZBIO)

SIC classification	Pharmaceutical Preparations (SIC 2834)
SEC CIK	0001953926

90-Day SEC Filing Activity

Form 4 filings (90d)	12
Form 8-K filings (90d)	1
Latest Form 4 filing	2026-06-17

Recent ZBIO Insider Transactions (Form 4)

Date	Insider	Role	Transaction	Shares	Price	Value	Filing
2026-05-18	MOULDER LEON O JR	Chief Executive Officer	P — Open-market purchase	60.0K	$16.88	$1.01M	SEC
2026-04-29	MOULDER LEON O JR	Chief Executive Officer	P — Open-market purchase	35.0K	$17.62	$617K	SEC
2026-04-28	MOULDER LEON O JR	Chief Executive Officer	P — Open-market purchase	25.0K	$18.02	$450K	SEC
2026-03-31	MOULDER LEON O JR	Chief Executive Officer	P — Open-market purchase	34.0K	$19.31	$657K	SEC
2026-03-31	Lu Hongbo	Director	P — Open-market purchase	75.0K	$20.00	$1.50M	SEC
2026-03-31	Lu Hongbo	Director	P — Open-market purchase	3.8K	$18.63	$70K	SEC
2026-03-31	Fairmount Funds Management LLC	Director	P — Open-market purchase	150.0K	$20.00	$3.00M	SEC
2026-03-30	MOULDER LEON O JR	Chief Executive Officer	P — Open-market purchase	20.0K	$18.23	$365K	SEC
2026-02-13	Allen Patricia L	Director	P — Open-market purchase	4.2K	$26.36	$110K	SEC
2026-02-12	Allen Patricia L	Director	P — Open-market purchase	5.7K	$24.34	$139K	SEC
2026-02-12	Allen Patricia L	Director	P — Open-market purchase	5.0K	$23.77	$119K	SEC
2026-02-12	Allen Patricia L	Director	P — Open-market purchase	5.0K	$26.50	$132K	SEC
2026-02-11	Lu Hongbo	Director	P — Open-market purchase	26.0K	$22.50	$585K	SEC
2026-02-05	Fox Jennifer A.	See Remarks	A — Grant or award	1.6K	$13.35	$21K	SEC
2026-02-05	Farmer Joseph L	See Remarks	A — Grant or award	974	$13.35	$13K	SEC

All transactions sourced from SEC EDGAR Form 4 filings for Zenas BioPharma, Inc. (ZBIO). Updated in real time as new filings are submitted to the SEC.

Most-Active ZBIO Insiders — Last 90 Days

Insider	Form 4 filings	Total transaction value
MOULDER LEON O JR	4	$2.08M
Farmer Joseph L	2	$13K
Fox Jennifer A.	2	$21K
Lu Hongbo	1	—
von Moltke Lisa	1	—

Recent ZBIO Form 8-K Material Events

2026-05-13 — Item 2.02, 5.02, 5.07, 9.01 [SEC]
2026-03-31 — Item 1.01, 2.03, 8.01, 9.01 · Financing · neutral [SEC]
Zenas BioPharma completed a public offering of $200 million in aggregate principal amount of 2.50% Convertible Senior Notes due 2032. The notes are unsecured senior obligations with a maturity date of April 1, 2032, and include conversion features tied to stock price performance
2026-03-16 — Item 2.02, 9.01 · Earnings · neutral [SEC]
Zenas BioPharma issued a press release on March 16, 2026 announcing its financial results for the quarter and year ended December 31, 2025. The filing provides standard financial reporting without indication of beat, miss, or guidance changes.

Recent Insider Filings

2026-06-17 — Nunn Jason Raleigh (Insider)
2026-06-17 — Lu Hongbo (Director)
2026-06-17 — MOULDER LEON O JR (See Remarks)
2026-06-17 — ORLOFF JOHN J (Director)
2026-06-17 — von Moltke Lisa (See Remarks)

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in ZBIO insider filings:

P	Open-market purchase by the insider
S	Open-market sale by the insider
A	Grant, award, or other acquisition from the issuer
M	Exercise or conversion of derivative security (e.g. options)
F	Payment of exercise price or tax liability via share withholding
G	Bona-fide gift of securities
D	Disposition to the issuer (e.g. share buyback participation)
J	Other acquisition or disposition
X	Exercise of in-the-money or at-the-money derivative security
C	Conversion of derivative security
V	Transaction voluntarily reported earlier than required

ZBIO Insider Trading — FAQ

What is the latest insider trade for ZBIO?: Zenas BioPharma, Inc. (ZBIO) had 12 insider filings in the last 90 days, with the most recent on 2026-06-17. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying ZBIO stock?: 0 insider purchases of ZBIO were filed in the last 90 days.
How many insiders are selling ZBIO stock?: 0 insider sales of ZBIO were filed in the last 90 days.
Where can I see ZBIO SEC filings (Form 4, 10-K, 10-Q, 8-K)?: InsiderAlpha aggregates every ZBIO SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

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