There is a long list of 103 institutional holders of OMER within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of OMER by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-OMER table below, the initial column indicates the name of each top institutional holder of OMER, with a link to that fund's top holdings. The next columns indicate the amount of OMER stock held by each of the institutional holders of OMER, followed by the OMER position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
Highbridge Capital Management LLC		$27,388	12/31/2023
BOND	45,083,000	$27,388	12/31/2023
Ingalls & Snyder LLC		$15,270	12/31/2023
OMER	4,546,762	$14,868	12/31/2023
NOTE 5	614,000	$369	12/31/2023
Call	10,000	$33	12/31/2023
D. E. Shaw & Co. Inc.		$14,061	12/31/2023
NOTE	14,880,000	$9,181	12/31/2023
OMER	1,492,303	$4,880	12/31/2023
BlackRock Inc.	4,279,836	$13,995	12/31/2023
OMER	4,279,836	$13,995	12/31/2023
DeepCurrents Investment Group LLC		$12,031	12/31/2023
NOTE 5	20,209,000	$11,997	12/31/2023
OMER	10,427	$34	12/31/2023
Vanguard Group Inc.	3,168,936	$10,362	12/31/2023
OMER	3,168,936	$10,362	12/31/2023
Whitebox Advisors LLC		$7,517	12/31/2023
NOTE 5	12,634,000	$7,517	12/31/2023
Context Capital Management LLC		$7,200	12/31/2023
NOTE 5	12,000,000	$7,200	12/31/2023
Stifel Financial Corp	1,890,674	$6,183	12/31/2023
OMER	1,890,674	$6,183	12/31/2023
Geode Capital Management LLC	1,338,713	$4,378	12/31/2023
OMER	1,338,713	$4,378	12/31/2023
State Street Corp	1,200,928	$3,927	12/31/2023
OMER	1,200,928	$3,927	12/31/2023
Wells Fargo & Company MN		$3,753	12/31/2023
NOTE 5	6,064,000	$3,684	12/31/2023
OMER	21,154	$69	12/31/2023
Affinity Asset Advisors LLC		$3,600	12/31/2023
NOTE 5	6,000,000	$3,600	12/31/2023
Verition Fund Management LLC		$3,498	12/31/2023
NOTE 5	5,774	$3,464	12/31/2023
OMER	10,427	$34	12/31/2023
Sonora Investment Management Group LLC		$3,235	12/31/2023
NOTE 5	5,159,000	$3,197	12/31/2023
OMER	11,545	$38	12/31/2023
Capstone Investment Advisors LLC		$2,776	12/31/2023
NOTE 5	5,160,000	$3,096	12/31/2023
Put	97,900	$320	12/31/2023
CI Private Wealth LLC	663,663	$2,170	12/31/2023
OMER	663,663	$2,170	12/31/2023
Bank of Montreal Can	563,096	$1,982	12/31/2023
OMER	563,096	$1,982	12/31/2023
Northern Trust Corp	559,052	$1,828	12/31/2023
OMER	559,052	$1,828	12/31/2023
Royal Bank of Canada	508,940	$1,664	12/31/2023
OMER	508,940	$1,664	12/31/2023
UBS Group AG	494,546	$1,617	12/31/2023
OMER	494,546	$1,617	12/31/2023
Charles Schwab Investment Management Inc.	469,174	$1,534	12/31/2023
OMER	469,174	$1,534	12/31/2023
Nomura Holdings Inc.	383,144	$1,253	12/31/2023
OMER	383,144	$1,253	12/31/2023
Walleye Capital LLC		$1,200	12/31/2023
NOTE 5	2,000,000	$1,200	12/31/2023
Morgan Stanley	282,405	$923	12/31/2023
OMER	282,405	$923	12/31/2023
Group One Trading L.P.		$715	12/31/2023
OMER	230,853	$755	12/31/2023
Put	33,800	$111	12/31/2023
Call	21,700	$71	12/31/2023
Bank of New York Mellon Corp	187,499	$647	03/31/2024
OMER	187,499	$647	03/31/2024
Bridgeway Capital Management Inc.	186,300	$609	12/31/2023
OMER	186,300	$609	12/31/2023
HN Saltoro Capital LP		$600	12/31/2023
NOTE 5	1,000,000	$600	12/31/2023
Bank of America Corp DE		$566	12/31/2023
OMER	170,211	$557	12/31/2023
NOTE 5	15,000	$9	12/31/2023
First Trust Advisors LP	172,755	$565	12/31/2023
OMER	172,755	$565	12/31/2023
Susquehanna International Group LLP		$540	12/31/2023
OMER	113,704	$372	12/31/2023
Call	70,100	$229	12/31/2023
Put	18,600	$61	12/31/2023
Ancora Advisors LLC	163,023	$533	12/31/2023
OMER	163,023	$533	12/31/2023
Barclays PLC	118,467	$387	12/31/2023
OMER	118,467	$387	12/31/2023
Ameriprise Financial Inc.	116,716	$382	12/31/2023
OMER	116,716	$382	12/31/2023
Rhumbline Advisers	109,083	$357	12/31/2023
OMER	109,083	$357	12/31/2023
Simplex Trading LLC		$276	03/31/2024
OMER	72,477	$250	03/31/2024
Call	49,300	$170	03/31/2024
Put	42,000	$144	03/31/2024
Badgley Phelps Wealth Managers LLC	78,556	$257	12/31/2023
OMER	78,556	$257	12/31/2023
Citadel Advisors LLC		$250	12/31/2023
Call	88,500	$289	12/31/2023
Put	64,500	$211	12/31/2023
OMER	52,713	$172	12/31/2023
Jane Street Group LLC	65,975	$216	12/31/2023
OMER	65,975	$216	12/31/2023
American Financial Group Inc.	64,113	$210	12/31/2023
OMER	64,113	$210	12/31/2023
Sheaff Brock Investment Advisors LLC	60,125	$197	12/31/2023
OMER	60,125	$197	12/31/2023
HighTower Advisors LLC	56,339	$184	12/31/2023
OMER	56,339	$184	12/31/2023
Cypress Capital Group	55,000	$180	12/31/2023
OMER	55,000	$180	12/31/2023
Two Sigma Investments LP	47,600	$156	12/31/2023
OMER	47,600	$156	12/31/2023
Invesco Ltd.	42,390	$139	12/31/2023
OMER	42,390	$139	12/31/2023
Goldman Sachs Group Inc.	41,857	$137	12/31/2023
OMER	41,857	$137	12/31/2023
JPMorgan Chase & Co.	41,315	$135	12/31/2023
OMER	41,315	$135	12/31/2023
Squarepoint Ops LLC	37,512	$123	12/31/2023
OMER	37,512	$123	12/31/2023
Brighton Jones LLC	33,516	$110	12/31/2023
OMER	33,516	$110	12/31/2023