$OMER

$17.49 +$1.20 (7.37%) Close

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

Ownership

13F as of Q2 2026 · 72.4M shares outstanding

Who owns OMER?

By type of holder

Institutions 49.3% Insiders 3.7% Everyone else 47.0%

Concentration Top 10 holders own 35.6%

BlackRock, Inc. 8.4% · Ingalls & Snyder LLC 5.1%

Institutional ownership

49.3%

+6.7 pts vs last qtr

Institutional holders

169

+7 vs last qtr

Net shares bought

+4.8M

by institutions in Q2 2026

New / sold out

35 / 28

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

UBS Group AG +807.7K
BlackRock, Inc. +735.0K

Biggest sellers in Q2 2026

Susquehanna International Group, LLP SOLD OUT −485.0K
Polar Asset Management Partners Inc. SOLD OUT −200.0K

Who is planning to sell?

Notices of proposed sale, last 12 months

$1.34M

5 notices from 3 people

Shares covered

92.4K

0.13% of the company

Arranged in advance

44%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

David J Borges Officer $751K
David Borges Officer 10b5-1 $499K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2019–FY2022

+26.7%

+8.20% a year

Each share's claim on the business

−21.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $60.4M

over 4 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+ years78% 3–5 years7% 1–3 years4% Under 1 year11%

Quarterly turnover

15.8%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting OMER on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	6.0M	8.35%	+735.0K (+13.8%)	≤2021	0.0%
Shares held by quarter Peak holding6.0M (Q2'26) Change over 8 quarters+1.8M Share of the company8.350% BlackRock, Inc.'s full portfolio →
IS Ingalls & Snyder LLC	3.7M	5.06%	+100.1K (+2.8%)	≤2021	1.0%
Shares held by quarter Peak holding4.5M (Q3'24) Change over 8 quarters−879.9K Share of the company5.060% Ingalls & Snyder LLC's full portfolio →

BlackRock, Inc.

6.0M

% of company

8.35%

Change vs last qtr

+735.0K (+13.8%)

Held since

≤2021

Ingalls & Snyder LLC

3.7M

% of company

5.06%

Change vs last qtr

+100.1K (+2.8%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Omeros Corporation, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting OMER on Form N-PORT; together they hold 17.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$20.7M	2.2M	3.00%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$17.9M	1.9M	2.59%	0.02%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$20.7M

% of company

3.00%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$17.9M

% of company

2.59%

% of the fund

0.02%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Omeros Corporation 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
DG Demopulos Gregory A MD Insider	2.1M	2.93%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company2.930% Demopulos Gregory A MD's insider activity →
SJ Schocken Joseph L Insider	528.1K	0.73%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.730% Schocken Joseph L's insider activity →

Demopulos Gregory A MD

Insider

2.1M

% of company

2.93%

Change vs last qtr

—

Held since

—

Schocken Joseph L

Insider

528.1K

% of company

0.73%

Change vs last qtr

—

Held since

—

3 more holders behind a free account

See every insider and 5%+ holder of Omeros Corporation.

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