$ASMB

$20.30 +$0.00 (0.0%) After hours

$ASMB Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 20.4M shares outstanding

Who owns ASMB?

By type of holder

Institutions 92.0% Insiders 8.0% Everyone else 0.0%

Concentration Top 10 holders own 74.2%

Gilead Sciences, Inc. 24.4% · Schornstein Alexander 8.1%

Institutional ownership

92.0%

+25.4 pts vs last qtr

Institutional holders

+16 vs last qtr

Net shares bought

+5.2M

by institutions in Q2 2026

New / sold out

33 / 17

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Paradigm Biocapital Advisors LP +888.5K
Jupiter Topco LLC NEW +849.3K

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −849.3K
Blackstone Inc. SOLD OUT −296.9K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Assembly Biosciences Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2021–FY2025

+55.5%

+11.67% a year

Each share's claim on the business

−35.7%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $24.7M

over 5 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years12% 3–5 years0% 1–3 years29% Under 1 year59%

Quarterly turnover

33.6%

of institutional shares changed hands

Top 10 managers, median time held

3 quarters

Super Investors

Investment managers reporting ASMB on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
GS Gilead Sciences, Inc. 13D · 25.1%	5.0M	24.44%	+471.7K (+10.5%)	2024	8.3%
Shares held by quarter Peak holding5.0M (Q2'26) Change over 8 quarters+5.0M Share of the company24.440% Disclosed stake13D · 25.1% Gilead Sciences, Inc.'s full portfolio →
FC Farallon Capital Management, L.L.C.	1.6M	7.88%	+377.0K (+30.7%)	Q3 '25	0.2%
Shares held by quarter Peak holding1.6M (Q2'26) Change over 8 quarters+1.6M Share of the company7.880% Farallon Capital Management, L.L.C.'s full portfolio →

Gilead Sciences, Inc.

13D · 25.1%

5.0M

% of company

24.44%

Change vs last qtr

+471.7K (+10.5%)

Held since

2024

Farallon Capital Management, L.L.C.

1.6M

% of company

7.88%

Change vs last qtr

+377.0K (+30.7%)

Held since

Q3 '25

28 more super investors behind a free account

See every manager holding Assembly Biosciences Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ASMB on Form N-PORT; together they hold 8.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$11.4M	413.3K	2.03%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$6.73M	245.0K	1.20%	0.01%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$11.4M

% of company

2.03%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$6.73M

% of company

1.20%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Assembly Biosciences Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SA Schornstein Alexander Insider	1.6M	8.06%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company8.060% Schornstein Alexander's insider activity →
OJ Okazaki Jason A Insider	163.4K	0.80%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.800% Okazaki Jason A's insider activity →

Schornstein Alexander

Insider

1.6M

% of company

8.06%

Change vs last qtr

—

Held since

—

Okazaki Jason A

Insider

163.4K

% of company

0.80%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of Assembly Biosciences Inc.

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