RSCM
ZBIO

Rock Springs Capital Management’s Zenas BioPharma ZBIO Stock Holding History

Rock Springs Capital Management’s Portfolio ZBIO Stock Details ZBIO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$9.82M Hold
502,077
– – 0.58% 48
2025
Q4 		$18.2M Sell
502,077
-78,600
-14% -$2.59M 0.93% 35
2025
Q3 		$12.9M Sell
580,677
-59,790
-9% -$973K 0.75% 46
2025
Q2 		$6.21M Sell
640,467
-238,200
-27% -$2.32M 0.39% 59
2025
Q1 		$6.94M Hold
878,667
– – 0.4% 58
2024
Q4 		$7.2M Hold
878,667
– – 0.27% 70
2024
Q3 		$14.9M Buy
+878,667
New +$15.8M 0.48% 55

Other funds holding ZBIO

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
SOCM
SR One Capital Management Wayne, Pennsylvania $915M AUM 209.71% 1-Year Est. Return
NMC
NEA Management Company Timonium, Maryland $1.76B AUM 223.33% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $352M AUM 220.14% 1-Year Est. Return
Federated Hermes
Federated Hermes Pittsburgh, Pennsylvania $61.5B AUM 30.7% 1-Year Est. Return
PCH
Polar Capital Holdings London, United Kingdom $28.2B AUM 115.26% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return
FFM
Fairmount Funds Management West Conshohocken, Pennsylvania $1.38B AUM 407.79% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
NA
NVP Associates Menlo Park, California $176M AUM 208.78% 1-Year Est. Return

Rock Springs Capital Management's ZBIO Position: Q1 2026 in Review

Rock Springs Capital Management held its Zenas BioPharma (ZBIO) position steady in Q1 2026 at 502,077 shares worth $9.82M. The position accounts for 0.58% of the portfolio, ranked #48.

Rock Springs Capital Management first reported a position in ZBIO in Q3 2024 and has held it in 7 quarters since. The position peaked at $18.2M in Q4 2025. 139 funds tracked by Wall St. Rank hold ZBIO as of Q1 2026.

  • Rock Springs Capital Management held 502,077 shares of Zenas BioPharma worth $9.82M as of Q1 2026.
  • Rock Springs Capital Management left its Zenas BioPharma share count unchanged in Q1 2026.
  • Zenas BioPharma made up 0.58% of Rock Springs Capital Management's portfolio in Q1 2026, its #48 holding.
  • Rock Springs Capital Management first reported a position in Zenas BioPharma in Q3 2024 and has held it in 7 quarters since.
  • Rock Springs Capital Management's Zenas BioPharma position peaked at $18.2M in Q4 2025.
  • 139 funds tracked by Wall St. Rank held Zenas BioPharma as of Q1 2026.

Based on Rock Springs Capital Management's 13F filing for Q1 2026, filed 15 May 2026.