ZBIO in the 13F filings

Zenas Biopharma Inc · CUSIP 98937L105

Sector · Pharmaceuticals and biotechnology Theme · Healthcare: biopharma and medtech· L3VLUP-defined Theme · Pharmaceutical preparations

Quarter

Q2 2026 Q1 2026 Q3 2024

Quarter end: 31 Mar 2026; the date the book describes
Filed: 18 May 2026; latest of these filings; the earliest 12 May 2026
Managers listing it: 18; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q4 2025 and Q1 2026; 0 listed it in both
Shares listed: 14,673,855; combined, among listed positions
Reported value: $302m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 14 buyers (opened or added shares) and 7 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +4,985,650.

Managers listing ZBIO in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

18 of 18 holders

				Action		Filing
Fidelity (FMR LLC)	9,082,000	$178m	under 0.1%	Added	+1,377,745	15 May 2026 (the filing on sec.gov)
AllianceBernstein LP	897,321	$33m	under 0.1%	Added	+878,971	15 May 2026 (the filing on sec.gov)
Wellington Management Group LLP	1,246,053	$24m	under 0.1%	Added	+390,719	15 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC	667,070	$13m	under 0.1%	Added	+473,917	15 May 2026 (the filing on sec.gov)
Woodline Partners LP	590,525	$12m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Marshall Wace LLP	501,928	$9.8m	under 0.1%	Added	+494,828	15 May 2026 (the filing on sec.gov)
Millennium Management LLC	476,818	$9.3m	under 0.1%	Added	+427,658	15 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	357,266	$7.0m	under 0.1%	Trimmed	-11,982	15 May 2026 (the filing on sec.gov)
Two Sigma Investments LP	275,056	$5.4m	under 0.1%	Added	+259,956	15 May 2026 (the filing on sec.gov)
Walleye Capital LLC	125,232	$2.4m	under 0.1%	New	new	13 May 2026 (the filing on sec.gov)
Invesco Ltd	113,479	$2.2m	under 0.1%	Trimmed	-74,489	12 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP	85,005	$1.7m	under 0.1%	Added	+71,327	15 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	77,493	$1.5m	under 0.1%	Trimmed	-55,946	15 May 2026 (the filing on sec.gov)
Citadel Advisors LLC	66,870	$1.3m	under 0.1%	Added	+42,411	15 May 2026 (the filing on sec.gov)
AQR Capital Management LLC	50,971	$996k	under 0.1%	Trimmed	-27,249	15 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC	42,874	$838k	under 0.1%	Added	+27,333	15 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC	17,638	$345k	under 0.1%	Added	+8,511	15 May 2026 (the filing on sec.gov)
Quantbot Technologies LP	256	$5k	under 0.1%	New	new	13 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

There is no earlier quarter on file to compare with.

Increases

Fidelity (FMR LLC)existing position · 9,082,000 shares now+1,377,745
AllianceBernstein LPexisting position · 897,321 shares now+878,971
Woodline Partners LPnew position · 590,525 shares now+590,525
Marshall Wace LLPexisting position · 501,928 shares now+494,828
Balyasny Asset Management LLCexisting position · 667,070 shares now+473,917

Reductions

Invesco Ltdexisting position · 113,479 shares now-74,489
Voloridge Investment Management LLCexisting position · 77,493 shares now-55,946
AQR Capital Management LLCexisting position · 50,971 shares now-27,249
T. Rowe Price Associates Incexisting position · 357,266 shares now-11,982

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (3)

Exited (3)

Point72 Asset Management LPwas $9.2m
Janus Henderson Group Ltdwas $287k
Brevan Howard Capital Management LPwas $224k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

1 in Q3 2024 to 1 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ZBIO and LLY →ZBIO and JNJ →ZBIO and VRTX →Choose a stock to compare with ZBIO →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ZBIO, latest filings →Back to the 13F Explorer →

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