SCHEDULE 13D/A Filed 2026-08-17 Event 2026-08-13 SEC 0001072613-26-000694 →

SR ONE CAPITAL MANAGEMENT, LLC → Zenas BioPharma, Inc. ZBIO

Stake: — Shares: 5,037,854 Class: Common stock, par value $0.0001 per share

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

24 transactions

24 buys · 0 sales · 0 awards/exercises

Issuer Cluster

3 13D/G filings on this issuer

2 other filings besides this one

Filer Track Record

7 filings by this filer

6 other filings in the data moat

Short Interest · settle 2026-07-31

DTC 13.83

11,753,566 shares short · -3.4% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $10.48M

Point72 Asset Mgmt

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-04-29	MOULDER LEON O JR	director, officer	Buy	35,000	$17.62	$617K
2026-04-28	MOULDER LEON O JR	director, officer	Buy	25,000	$18.02	$451K
2026-03-31	Lu Hongbo	director	Buy	3,768	$18.63	$70K
2026-03-31	Fairmount Funds Management LLC	director	Buy	150,000	$20.00	$3.00M
2026-03-31	Lu Hongbo	director	Buy	75,000	$20.00	$1.50M
2026-03-31	MOULDER LEON O JR	director, officer	Buy	34,000	$19.31	$657K
2026-03-30	MOULDER LEON O JR	director, officer	Buy	20,000	$18.23	$365K
2026-02-13	Allen Patricia L	director	Buy	4,160	$26.36	$110K
2026-02-12	Allen Patricia L	director	Buy	5,000	$23.77	$119K
2026-02-12	Allen Patricia L	director	Buy	5,700	$24.34	$139K
2026-02-12	Allen Patricia L	director	Buy	5,000	$26.50	$133K
2026-02-11	Lu Hongbo	director	Buy	25,985	$22.50	$585K
2026-02-02	MOULDER LEON O JR	director, officer	Buy	57,000	$17.96	$1.02M
2026-01-09	MOULDER LEON O JR	director, officer	Buy	20,000	$16.55	$331K
2026-01-08	MOULDER LEON O JR	director, officer	Buy	30,000	$16.30	$489K
2026-01-07	MOULDER LEON O JR	director, officer	Buy	50,000	$16.38	$819K
2025-10-09	Nunn Jason Raleigh	director	Buy	63,158	$19.00	$1.20M
2025-10-09	SR ONE CAPITAL MANAGEMENT, LLC	10%+ owner	Buy	63,158	$19.00	$1.20M
2025-10-09	ENRIGHT PATRICK G	director	Buy	105,265	$19.00	$2.00M
2025-10-09	ENRIGHT PATRICK G	director	Buy	11,990	$20.85	$250K
2025-10-09	SR ONE CAPITAL MANAGEMENT, LLC	10%+ owner	Buy	63,157	$19.00	$1.20M
2025-10-07	MOULDER LEON O JR	director, officer	Buy	36,928	$20.85	$770K
2025-10-07	Fairmount Funds Management LLC	director	Buy	316,219	$19.00	$6.01M
2025-10-07	Lu Hongbo	director	Buy	263,160	$19.00	$5.00M

Other 13D/G Filings on Zenas BioPharma, Inc.

Filed	Form	Filer	Stake	Shares
2026-08-19	SCHEDULE 13D/A	Enavate Sciences GP, LLC	4.90%	3,245,404	view →
2025-10-14	SCHEDULE	Enavate Sciences GP, LLC	7.30%	3,919,159	view →

Other Filings by SR ONE CAPITAL MANAGEMENT, LLC

Filed	Form	Issuer	Stake	Shares
2026-08-14	SCHEDULE 13D/A	Veradermics, Inc.	—	2,080,119	view →
2026-05-18	SCHEDULE 13D	Odyssey Therapeutics, Inc. ODTX	8.00%	3,794,883	view →
2025-10-01	SCHEDULE	KALA BIO, Inc. KALA	5.50%	411,000	view →
2023-12-18	SC	Arcellx, Inc. ACLX	—	—	view →
2023-06-02	SC	Arcellx, Inc. ACLX	—	—	view →
2022-06-27	SC	Arcellx, Inc. ACLX	—	—	view →

Want this depth on every filing the moment it hits SEC EDGAR?

Full feed access · API · daily intelligence brief · custom alerts. From $49/mo.

See pricing →