Ingalls & Snyder reports 3.47M shares (4.8%) of Omeros

Ingalls & Snyder, LLC reports beneficial ownership of 3,466,268 shares of OMEROS CORP common stock, representing 4.8% of the class.

Rhea-AI Filing Summary

Ingalls & Snyder, LLC reports beneficial ownership of 3,466,268 shares of OMEROS CORP common stock, representing 4.8% of the class. The filing states the reported share count includes shares held in advisory accounts and assumes conversion of $550,000 principal of Omeros 5.25% due 2/15/26. The filer reports shared dispositive power for all 3,466,268 shares and discloses the filing as an amendment (No. 14).

Insights

Institutional Ownership Analyst

Register shows a sub-5% position held with shared dispositive authority.

The filing records 3,466,268 shares (4.8%) held with shared dispositive power by Ingalls & Snyder, LLC, including accounts managed under investment advisory contracts. The statement notes inclusion of shares from conversion of $550,000 of a convertible bond.

Because the position is under the 5% threshold, this is a routine disclosure of passive/managed holdings; subsequent Schedule 13 filings would show material changes to ownership.

Key Figures

Shares beneficially owned: 3,466,268 shares Percent of class: 4.8% Assumed conversion: $550,000 +3 more

6 metrics

Shares beneficially owned 3,466,268 shares reported in Schedule 13G/A amendment

Percent of class 4.8% percent of common stock as reported

Assumed conversion $550,000 conversion of Omeros 5.25% due 2/15/26 included in share count

Filing amendment Amendment No. 14 Schedule 13G/A amendment identifier

Shared dispositive power 3,466,268 shares number of shares for which shared dispositive power is reported

Signature date 04/23/2026 date the amendment was signed

Key Terms

Schedule 13G/A, shared dispositive power, beneficially owned, assumes conversion

4 terms

Schedule 13G/A regulatory

"Amendment No. 14 ) OM ER OS CORP COMMON STOCK"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

shared dispositive power regulatory

"Shared Dispositive Power 3,466,268.00"

beneficially owned regulatory

"Amount beneficially owned: 3466268"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

assumes conversion financial

"Share count assumes conversion of $550,000 Omeros 5.25% due 2/15/26"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake in OMER does Ingalls & Snyder report?

Ingalls & Snyder reports beneficial ownership of 3,466,268 shares, equal to 4.8% of OMER common stock as stated in the filing.

Does the filing show voting or dispositive power for the shares?

The filing reports 0 sole voting and 0 sole dispositive power; it reports shared dispositive power for 3,466,268 shares under advisory accounts.

Are convertible securities included in Ingalls & Snyder's share count?

Yes. The filing states the share count assumes conversion of $550,000 principal of the Omeros 5.25% due 2/15/26, and those shares are included in the reported total.

Is this an initial 5% filing or an amendment?

This is an amendment (Amendment No. 14) to a prior Schedule 13G filing; the filing updates the reported beneficial ownership figure and related disclosures.

Who signed the Schedule 13G/A for Ingalls & Snyder?

The filing is signed by Thomas O Boucher, listed as Managing Director, with signature date 04/23/2026 on the submitted amendment.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/23/2026 - 10:08 AM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 14)

OMEROS CORP

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

682143102

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 682143102

1

Names of Reporting Persons

INGALLS & SNYDER LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

NEW YORK

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,466,268.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,466,268.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.8 %

12

Type of Reporting Person (See Instructions)

BD, IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: OMEROS CORP
(b)	Address of issuer's principal executive offices: 201 ELLIOTT AVENUE WEST, SEATTLE, WASHINGTON, 98119
Item 2.
(a)	Name of person filing: INGALLS & SNYDER, LLC
(b)	Address or principal business office or, if none, residence: 1 ROCKEFELLER PLAZA, NEW YORK, NY 10020
(c)	Citizenship: NEW YORK
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 682143102
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 3466268
(b)	Percent of class: 4.8 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 3466268
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Ingalls & Snyder, LLC ("I&S") is a registered broker dealer and a registered investment advisor. Shares reported under shared dispositive power include shares held in accounts managed under investment advisory contracts. Share count assumes conversion of $550,000 Omeros 5.25% due 2/15/26.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

INGALLS & SNYDER LLC

Signature:	THOMAS O BOUCHER JR
Name/Title:	MANAGING DIRECTOR
Date:	04/23/2026