Comparable stake leader
INGALLS & SNYDER LLC
SEC ownership of OMEROS CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001285819.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
22 May 2026
- Public ticker
- OMER on Nasdaq
- Parsed ownership sources
- 13F, 13D/G, and 3/4/5
- Largest SEC-reported holder
- INGALLS & SNYDER LLC
- Latest 13D/G holder
- INGALLS & SNYDER LLC
- Latest parsed ownership date
- 22 May 2026
- Issuer CIK
- 0001285819
- Issuer location
- Seattle, WA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of OMEROS CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
INGALLS & SNYDER LLC
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
22 May 2026
13F
13D/G
3/4/5
Lead comparable stake: 4.8%
13D/G row: INGALLS & SNYDER LLC
Showing 1-8 of 50 holder rows.
Quick read
INGALLS & SNYDER LLC leads the comparable SEC ownership view at 4.8%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens INGALLS & SNYDER LLC's linked filing trail.
Comparable ownership
Top 5
INGALLS & SNYDER LLC
4.8%
Gregory A. Demopulos MD
2.6%
Thomas J. Cable
0.05%
BlackRock, Inc.
7.4%
VANGUARD CAPITAL MANAGEMENT LLC
4.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| INGALLS & SNYDER LLC |
13F
13D/G
Company
|
4.8%
from 13D/G
|
$37,588,000
3,559,423 shares
|
— | 31 Mar 2026 |
| Gregory A. Demopulos MD |
3/4/5
Chairman, CEO & President, Director
|
2.6%
|
$22,586,507
1,893,253 shares
|
— | 18 Feb 2026 |
| Thomas J. Cable |
3/4/5
Director
|
0.05%
|
$406,959
35,067 shares
|
-$87,039 | 22 May 2026 |
| BlackRock, Inc. |
13F
Company
|
7.4%
|
$56,069,647
5,309,626 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
4.1%
|
$31,503,215
2,983,259 shares
|
— | 31 Mar 2026 |
| UBS Group AG |
13F
Company
|
3.2%
|
$24,718,119
2,340,731 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13F
Company
|
2.7%
|
$20,270,712
1,919,575 shares
|
— | 31 Mar 2026 |
| STIFEL FINANCIAL CORP |
13F
Company
|
2.5%
|
$19,341,544
1,831,585 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$837,954.
Buys
$0
Insiders: 0
Sells
$837,954
Insiders: 2
Net
-$837,954
Shares: -67,500
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 67,500
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 7,500 | $0 | $87,039 | -$87,039 |
| 3-6 | 0 | 60,000 | $0 | $750,915 | -$750,915 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-13 of 13 reporting-owner rows connected to OMEROS CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Largest Forms 3/4/5 holder
Gregory A. Demopulos MD
Net 12M change
-$837,954
Latest report
22 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Gregory A. Demopulos MD | Chairman, CEO & President, Director | $22,586,507 | Mixed | 18 Feb 2026 | ||
| Thomas J. Cable | Director | $406,959 | -$87,039 | -18% | Filing P/S | 22 May 2026 |
| David J. Borges | VP, Finance & CAO | $0 | -$750,915 | -100% | Mixed | 12 Jan 2026 |
| Peter A. Demopulos MD | Director | Mixed | 27 Jun 2025 | |||
| Peter B. Cancelmo | VP, General Counsel | Mixed | 30 Jun 2025 | |||
| Michael A. Jacobsen | VP, Finance & CAO | Mixed | 25 Apr 2024 | |||
| Ray Aspiri | Director | Mixed | 11 Jun 2021 | |||
| Kurt Zumwalt | Director | Mixed | 21 Sep 2022 | |||
| Thomas F. Bumol | Director | Mixed | 27 Jun 2025 | |||
| Rajiv Shah | Director | Mixed | 27 Jun 2025 | |||
| Perkinson Diana T. | Director | Mixed | 27 Jun 2025 | |||
| Leroy E. MD Hood PhD | Director | Mixed | 27 Jun 2025 | |||
| Arnold C. Hanish | Director | Mixed | 27 Jun 2025 |
Recent insider transactions for OMEROS CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Thomas J. Cable | OMER | Common Stock | Sale | -17.6% | $87,039 | $11.61 | -7,500 | 35,067 | 22 May 2026 | Direct |
| Thomas J. Cable | OMER | Common Stock | Options Exercise | 21.4% | 7,500 | 42,567 | 22 May 2026 | Direct | ||
| Thomas J. Cable | OMER | Stock Option (Right to Buy) | Options Exercise | -100% | -7,500 | 0 | 22 May 2026 | Direct | ||
| Gregory A. Demopulos MD | OMER | Common stock | Tax liability | -19.6% | -357,678 | 1,469,308 | 18 Feb 2026 | Direct | ||
| Gregory A. Demopulos MD | OMER | Common stock | Options Exercise | 28% | 400,000 | 1,826,986 | 18 Feb 2026 | Direct | ||
| Gregory A. Demopulos MD | OMER | Stock option (right to buy) | Options Exercise | -100% | -400,000 | 0 | 18 Feb 2026 | Direct | ||
| David J. Borges | OMER | Common stock | Sale | -100% | $369,315 | $12.31 | -30,000 | 0 | 13 Jan 2026 | Direct |
| David J. Borges | OMER | Common stock | Options Exercise | 30,000 | 30,000 | 13 Jan 2026 | Direct | |||
| David J. Borges | OMER | Stock Option (right to buy) | Options Exercise | -31.6% | -30,000 | 65,000 | 13 Jan 2026 | Direct | ||
| David J. Borges | OMER | Common stock | Sale | -100% | $381,600 | $12.72 | -30,000 | 0 | 12 Jan 2026 | Direct |
| Gregory A. Demopulos MD | OMER | Common Stock | Gift | 600,000 | 300,000 | 13 Oct 2025 | By trust | |||
| Gregory A. Demopulos MD | OMER | Common Stock | Gift | -29.6% | -600,000 | 1,426,986 | 13 Oct 2025 | Direct | ||
| Gregory A. Demopulos MD | OMER | Stock Option (right to buy) | Award | 865,000 | 865,000 | 30 Jun 2025 | Direct | |||
| Peter B. Cancelmo | OMER | Stock Option (right to buy) | Award | 100,000 | 100,000 | 30 Jun 2025 | Direct | |||
| David J. Borges | OMER | Stock Option (right to buy) | Award | 95,000 | 95,000 | 30 Jun 2025 | Direct | |||
| Rajiv Shah | OMER | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 27 Jun 2025 | Direct | |||
| Perkinson Diana T. | OMER | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 27 Jun 2025 | Direct | |||
| Leroy E. MD Hood PhD | OMER | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 27 Jun 2025 | Direct | |||
| Arnold C. Hanish | OMER | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 27 Jun 2025 | Direct | |||
| Peter A. Demopulos MD | OMER | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 27 Jun 2025 | Direct | |||
| Thomas J. Cable | OMER | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 27 Jun 2025 | Direct | |||
| Thomas F. Bumol | OMER | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 27 Jun 2025 | Direct |
* marks a reported price that did not pass the local price check.