Assembly Biosciences Ownership | Who Owns Assembly Biosciences?

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Assembly Biosciences Ownership Summary

Assembly Biosciences is owned by 83.44% institutional investors, 32.30% insiders. Gilead sciences is the largest institutional shareholder, holding 58.85% of ASMB shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 2.20% of its assets in Assembly Biosciences shares.

ASMB Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Assembly Biosciences	83.44%	32.30%	-15.74%
Sector	Healthcare Stocks	232.01%	10.74%	-142.75%
Industry	Biotech Stocks	381.47%	10.55%	-292.02%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Gilead sciences	4.51M	58.85%	$153.23M
Farallon capital management	1.23M	16.03%	$31.43M
Ra capital management	1.02M	13.33%	$26.12M
Commodore capital lp	1.00M	13.06%	$25.60M
Vanguard group	572.90K	7.48%	$19.48M
Blackstone	447.79K	5.85%	$11.46M
Point72 asset management	296.02K	3.87%	$7.58M
Parkman healthcare partners	250.98K	3.28%	$6.43M
Franklin resources	210.53K	2.75%	$7.16M
Blackrock funding, inc. /de	192.30K	2.51%	$6.54M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Gilead sciences	4.51M	7.92%	$153.23M
B group	175.71K	3.31%	$4.50M
Commodore capital lp	1.00M	1.25%	$25.60M
Patient square capital lp	127.00K	0.92%	$4.32M
Parkman healthcare partners	250.98K	0.67%	$6.43M
Monimus capital management, lp	42.07K	0.66%	$1.08M
Stempoint capital lp	66.13K	0.34%	$1.69M
Ra capital management	1.02M	0.32%	$26.12M
Palumbo wealth management	37.30K	0.31%	$1.27M
Ellsworth advisors	29.73K	0.18%	$889.37K

Top Buyers

Holder	Shares	% Assets	Change
Farallon capital management	1.23M	0.13%	1.23M
Ra capital management	1.02M	0.32%	1.02M
Commodore capital lp	1.00M	1.25%	1.00M
Blackstone	447.79K	0.05%	447.79K
Point72 asset management	296.02K	0.01%	296.02K

Top Sellers

Holder	Shares	% Assets	Change
Frazier life sciences management	-	-	-456.25K
Renaissance	9.24K	0.00%	-144.37K
Franklin resources	210.53K	0.00%	-27.64K
Walleye capital	-	-	-24.50K
Armistice capital	-	-	-23.86K

New Positions

Holder	Shares	% Assets	Change	Value
Farallon capital management	1.23M	0.13%	1.23M	$31.43M
Ra capital management	1.02M	0.32%	1.02M	$26.12M
Commodore capital lp	1.00M	1.25%	1.00M	$25.60M
Blackstone	447.79K	0.05%	447.79K	$11.46M
Point72 asset management	296.02K	0.01%	296.02K	$7.58M

Sold Out

Holder	Change
Frazier financial advisors	-1.00
Royal bank of canada	-53.00
Sbi securities	-68.00
Ameriflex group	-83.00
Wells fargo & company/mn	-145.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	36	-38.98%	6,388,221	-48.82%	83	0.31%	23	-50.00%	7	75.00%
Sep 30, 2025	43	26.47%	9,347,787	196.88%	122	7.22%	30	130.77%	4	-50.00%
Jun 30, 2025	34	-5.56%	3,148,666	-0.85%	41	2.30%	13	-18.75%	8	-20.00%
Mar 31, 2025	36	2.86%	3,175,639	-0.32%	42	1.81%	16	-23.81%	10	42.86%
Dec 31, 2024	35	16.67%	3,185,761	210.20%	48	18.52%	21	61.54%	7	-

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	347.88K	2.20%	-
Vanguard US Total Market Shares ETF	114.78K	1.53%	-
Franklin Biotechnology Discv A(acc)USD	133.55K	0.84%	-32.65K
Vanguard Institutional Extnd Mkt Idx Tr	124.27K	0.79%	758.00
Fidelity Extended Market Index	59.55K	0.38%	1.28K
Bridgeway Ultra-Small Company Market	13.75K	0.22%	-
Blackrock Extended Mkt Fund CF	29.65K	0.19%	29.65K
Franklin Biotechnology Discovery A	27.88K	0.18%	-43.56K
Extended Equity Market Fund K	25.43K	0.16%	17.00
Federated Hermes MDT Small Cap Growth IS	25.39K	0.16%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 08, 2025	GILEAD SCIENCES, INC.	-	Buy	$2.30K
Aug 08, 2025	GILEAD SCIENCES, INC.	-	Buy	$24.80M
Aug 08, 2025	GILEAD SCIENCES, INC.	-	Buy	$24.80M
Mar 31, 2025	McHutchison John G	-	Sell	$7.46K
Mar 31, 2025	Bjorkquist Jeanette M	Principal Accounting Officer	Sell	$1.77K

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	-	-
2025 Q1	-	4
2024 Q4	6	3
2024 Q3	2	2
2024 Q2	2	10

ASMB Ownership FAQ

Who Owns Assembly Biosciences?

Assembly Biosciences shareholders are primarily institutional investors at 83.44%, followed by 32.30% insiders and -15.74% retail investors. The average institutional ownership in Assembly Biosciences's industry, Biotech Stocks , is 381.47%, which Assembly Biosciences falls below.

Who owns the most shares of Assembly Biosciences?

Assembly Biosciences’s largest shareholders are Gilead sciences (4.51M shares, 58.85%), Farallon capital management (1.23M shares, 16.03%), and Ra capital management (1.02M shares, 13.33%). Together, they hold 88.21% of Assembly Biosciences’s total shares outstanding.

Does Blackrock own Assembly Biosciences?

BlackRock is not among the top 10 institutional shareholders of Assembly Biosciences.

Who is Assembly Biosciences’s biggest shareholder by percentage of total assets invested?

Gilead sciences is Assembly Biosciences’s biggest shareholder by percentage of total assets invested, with 7.92% of its assets in 4.51M Assembly Biosciences shares, valued at 153.23M$.

Who is the top mutual fund holder of Assembly Biosciences shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Assembly Biosciences shares, with 2.20% of its total shares outstanding invested in 347.88K Assembly Biosciences shares.

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