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Thomas Steyer’s Assembly Biosciences ASMB Stock Holding History

Thomas Steyer’s Portfolio ASMB Stock Details ASMB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$44.1M Buy
1,604,590
+377,000
+31% +$10.3M 0.2% 43
2026
Q1 		$34.1M Hold
1,227,590
– – 0.18% 53
2025
Q4 		$41.8M Hold
1,227,590
– – 0.18% 58
2025
Q3 		$31.4M Buy
+1,227,590
New +$26.9M 0.13% 65
2019
Q3 		– Sell
-8,333
Closed -$1.35M – 102
2019
Q2 		$1.35M Hold
8,333
– – 0.01% 101
2019
Q1 		$1.97M Sell
8,333
-20,834
-71% -$5.27M 0.01% 92
2018
Q4 		$7.92M Buy
29,167
+4,167
+17% +$1.21M 0.06% 86
2018
Q3 		$11.1M Buy
+25,000
New +$11.7M 0.07% 83
2018
Q1 		– Sell
-20,833
Closed -$11.3M – 90
2017
Q4 		$11.3M Buy
+20,833
New +$9.43M 0.09% 65

Other funds holding ASMB

GS
Gilead Sciences Foster City, California $1.65B AUM 166.99% 1-Year Est. Return
PBA
Paradigm Biocapital Advisors New York $5.34B AUM 380.18% 1-Year Est. Return
CC
Commodore Capital New York $1.68B AUM 375.52% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
JT
Jupiter Topco New York $245B AUM
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
PHP
Parkman Healthcare Partners Stamford, Connecticut $977M AUM 110.37% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return
SFCM
Seven Fleet Capital Management Mountain View, California $606M AUM

Thomas Steyer's ASMB Position: Q2 2026 in Review

Thomas Steyer increased its Assembly Biosciences (ASMB) stake by 31% in Q2 2026, buying an estimated $10.3M and bringing the position to 1,604,590 shares worth $44.1M. The position accounts for 0.2% of the portfolio, ranked #43.

Thomas Steyer first reported a position in ASMB in Q4 2017 and has held it in 9 quarters since. 92 funds tracked by Wall St. Rank hold ASMB as of Q2 2026.

  • Thomas Steyer held 1,604,590 shares of Assembly Biosciences worth $44.1M as of Q2 2026.
  • Thomas Steyer bought 377,000 Assembly Biosciences shares in Q2 2026, an estimated $10.3M.
  • Assembly Biosciences made up 0.2% of Thomas Steyer's portfolio in Q2 2026, its #43 holding.
  • Thomas Steyer first reported a position in Assembly Biosciences in Q4 2017 and has held it in 9 quarters since.
  • 92 funds tracked by Wall St. Rank held Assembly Biosciences as of Q2 2026.

Based on Farallon Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.