Merrimack Pharmaceuticals Inc (MACK) Ownership

15.13 ↑0.00 (0.00%)

As of December 31, 1969, 7:00pm EST.

Institutions
Mutual Funds

Institutional Ownership

Western Standard LLC is the biggest individual institutional holder of Merrimack Pharmaceuticals Inc (MACK), owning a total of 2.2 million shares. Combined, the top 39 institutional holders of MACK own 86.69% of the company with a total of 12.6 million shares.

In the latest ownership report on March 31st 2024, the top 39 institutional holders increased their combined ownership of MACK by 562 thousand shares. 8 institutions bought 872,661 total additional shares and increased their ownership by an average of 331.05%. However 7 institutions sold 310,614 total shares and decreased their ownership by an average of 16.76%.

Overall this is a positive sign as the number of shares owned by the top 20 institutional holders of Merrimack Pharmaceuticals increased by a net total of 562,047 in the latest quarter.

Institution Ownership Chart

Latest Institutional Ownership Changes

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
Western Standard LLC	14.691%	0.000%	2,172,513	0	2024-03-31
Newtyn Management LLC	12.670%	0.000%	1,873,694	0	2024-03-31
ADAR1 Capital Management LLC	6.102%	64.237%	902,350	352,932	2024-03-31
BlackRock Inc	4.891%	-2.734%	723,294	-20,329	2024-03-31
Vanguard Group Inc	4.198%	1.953%	620,847	11,893	2024-03-31
Dimensional Fund Advisors, Inc.	2.691%	-8.641%	398,001	-37,644	2024-03-31
Madison Avenue Partners, LP	2.618%	-29.989%	387,221	-165,864	2024-03-31
Sepio Capital, LLC	2.019%	-2.653%	298,545	-8,135	2024-03-31
Amvescap Plc.	1.874%	2,196.730%	277,124	265,058	2024-03-31
Geode Capital Management, LLC	1.839%	4.643%	272,015	12,069	2024-03-31
State Street Corporation	1.669%	25.494%	246,853	50,148	2024-03-31
Wittenberg Investment Management Inc	1.422%	0.000%	210,239	0	2024-03-31
Renaissance Technologies Corp	1.097%	231.665%	162,184	113,284	2024-03-31
Yakira Capital Management, Inc.	0.817%	123.135%	120,756	66,638	2024-03-31
Northern Trust Corp	0.795%	0.547%	117,548	639	2024-03-31
Bank of New York Mellon Corp	0.642%	-5.292%	94,895	-5,302	2024-03-31
Susquehanna International Group, LLP	0.523%	-4.023%	77,397	-3,244	2024-03-31
Morgan Stanley - Brokerage Accounts	0.267%	-63.992%	39,442	-70,096	2024-03-31
Bridgeway Capital Management, LLC	0.231%	0.000%	34,200	0	2024-03-31
Charles Schwab Investment Management Inc	0.200%	0.000%	29,628	0	2024-03-31

Top Institutions

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
Western Standard LLC	14.691%	0.000%	2,172,513	0	2024-03-31
Newtyn Management LLC	12.670%	0.000%	1,873,694	0	2024-03-31
Point72 Asset Management, L.P.	8.210%	228.549%	1,100,994	765,886	2022-09-30
22NW, LP	7.121%	-17.544%	1,015,048	-215,966	2022-12-31
ADAR1 Capital Management LLC	6.102%	64.237%	902,350	352,932	2024-03-31
BlackRock Inc	4.891%	-2.734%	723,294	-20,329	2024-03-31
Vanguard Group Inc	4.198%	1.953%	620,847	11,893	2024-03-31
Dimensional Fund Advisors, Inc.	2.691%	-8.641%	398,001	-37,644	2024-03-31
Madison Avenue Partners, LP	2.618%	-29.989%	387,221	-165,864	2024-03-31
Sepio Capital, LLC	2.019%	-2.653%	298,545	-8,135	2024-03-31
Sio Capital Management, LLC	1.985%	0.000%	288,466	0	2023-12-31
Amvescap Plc.	1.874%	2,196.730%	277,124	265,058	2024-03-31
Geode Capital Management, LLC	1.839%	4.643%	272,015	12,069	2024-03-31
State Street Corporation	1.669%	25.494%	246,853	50,148	2024-03-31
Indaba Capital Management, LLC	1.538%	63.345%	223,459	86,657	2023-12-31
Wittenberg Investment Management Inc	1.422%	0.000%	210,239	0	2024-03-31
Centiva Capital, LP	1.311%	0.000%	187,803	187,803	2023-09-30
Renaissance Technologies Corp	1.097%	231.665%	162,184	113,284	2024-03-31
Yakira Capital Management, Inc.	0.817%	123.135%	120,756	66,638	2024-03-31
Northern Trust Corp	0.795%	0.547%	117,548	639	2024-03-31
Nantahala Capital Management, LLC	0.776%	-41.888%	111,148	-80,118	2023-06-30
Bank of New York Mellon Corp	0.642%	-5.292%	94,895	-5,302	2024-03-31
Marshall Wace Asset Management Ltd	0.608%	-11.417%	87,037	-11,218	2023-06-30
Susquehanna International Group, LLP	0.523%	-4.023%	77,397	-3,244	2024-03-31
Orbimed Advisors, LLC	0.516%	0.000%	73,600	73,600	2022-12-31
Goldman Sachs Group Inc	0.484%	101.396%	70,394	35,441	2023-12-31
PURA VIDA INVESTMENTS, LLC	0.450%	0.000%	64,100	64,100	2022-12-31
Rosalind Advisors, Inc.	0.413%	0.000%	60,000	60,000	2023-12-31
BOOTHBAY FUND MANAGEMENT, LLC	0.324%	-60.458%	46,437	-70,999	2023-06-30
Kennedy Capital Management Inc	0.318%	-50.696%	46,202	-47,506	2023-12-31
Two Sigma Investments LLC	0.298%	97.453%	42,490	20,971	2022-12-31
Millennium Management LLC	0.281%	136.703%	40,204	23,219	2023-03-31
Morgan Stanley - Brokerage Accounts	0.267%	-63.992%	39,442	-70,096	2024-03-31
Belvedere Trading LLC	0.274%	94.444%	38,990	18,938	2022-12-31
SIMPLEX TRADING, LLC	0.272%	-3.572%	36,468	-1,351	2022-06-30
Bridgeway Capital Management, LLC	0.231%	0.000%	34,200	0	2024-03-31
Charles Schwab Investment Management Inc	0.200%	0.000%	29,628	0	2024-03-31
Two Sigma Advisers, LLC	0.139%	-1.581%	18,681	-300	2022-09-30
Brown Advisory Holdings Inc	0.112%	0.000%	15,029	0	2022-12-31

Mutual Fund Ownership

Vanguard Total Stock Mkt Idx Inv is the biggest individual fund holder of Merrimack Pharmaceuticals Inc (MACK), owning a total of 319 thousand shares. Combined, the top 51 mutual fund holders of MACK own 22.84% of the company with a total of 3.3 million shares.

In the latest ownership report on June 30th 2024, the top 51 fund holders increased their combined ownership of MACK by 3 thousand shares. 1 funds bought 2,994 total additional shares and increased their ownership by an average of 23.28%. However 2 funds sold 34 total shares and decreased their ownership by an average of 0.07%.

Overall this is a positive sign as the number of shares owned by the top 20 mutual funds holding Merrimack Pharmaceuticals increased by a net total of 2,960 in the latest report.

Mutual Funds Chart

Latest Mutual Fund Ownership Changes

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
State St Russell Sm/Mid Cp® Indx NL Cl C	0.414%	0.000%	61,200	0	2024-06-30
State St Russell Sm Cap® Indx SL Cl I	0.224%	0.000%	33,100	0	2024-06-30
BlackRock Extended Equity Market K	0.202%	-0.097%	29,894	-29	2024-06-30
State St Russell All Cap® Indx NL Cl C	0.121%	0.000%	17,900	0	2024-06-30
NT Ext Equity Mkt Idx Fd - L	0.107%	23.280%	15,855	2,994	2024-06-30
NT Ext Equity Mkt Idx Fd - DC - NL - T2	0.075%	-0.045%	11,145	-5	2024-06-30

Top Mutual Funds

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
Vanguard Total Stock Mkt Idx Inv	2.155%	0.000%	318,613	0	2024-04-30
Invesco Dorsey Wright SmallCap Momt ETF	1.856%	0.000%	269,649	0	2024-04-30
Invesco DWA SmallCap Momentum ETF	1.742%	0.000%	248,388	0	2023-06-30
iShares Russell 2000 ETF	1.656%	-0.794%	240,671	-1,927	2024-04-30
Vanguard Instl Ttl Stck Mkt Idx Tr	1.679%	-35.000%	240,498	-129,500	2023-03-31
Vanguard Institutional Extnd Mkt Idx Tr	1.375%	0.000%	203,398	0	2024-04-30
Vanguard Extended Market Index Investor	1.384%	0.000%	198,199	0	2023-08-31
DFA US Micro Cap I	0.982%	0.000%	145,158	0	2024-04-30
Fidelity Small Cap Index	0.717%	0.949%	105,966	996	2024-04-30
Fidelity® Small Cap Index	0.703%	0.804%	100,610	802	2023-10-31
DFA US Small Cap I	0.666%	-8.970%	98,548	-9,711	2024-04-30
iShares Russell 2000 Growth ETF	0.597%	-0.239%	86,730	-208	2024-04-30
Fidelity Extended Market Index	0.560%	-0.281%	82,829	-233	2024-05-31
Fidelity® Extended Market Index	0.541%	2.680%	77,423	2,021	2023-11-30
State St Russell Sm/Mid Cp® Indx NL Cl C	0.414%	0.000%	61,200	0	2024-06-30
Kennedy Micro Cap Opportunities	0.315%	-51.211%	45,719	-47,989	2023-12-31
State St Russell Sm Cap® Indx NL Cl C	0.305%	14.398%	43,700	5,500	2023-09-30
Vanguard Russell 2000 ETF	0.271%	0.321%	40,071	128	2024-04-30
Dimensional US Targeted Value ETF	0.262%	0.000%	38,049	0	2024-04-30
BlackRock Extended Mkt Composite	0.234%	0.532%	34,595	183	2023-09-30
Fidelity® Total Market Index	0.235%	0.000%	33,652	0	2023-11-30
State St Russell Sm Cap® Indx SL Cl I	0.224%	0.000%	33,100	0	2024-06-30
Bridgeway Ultra-Small Company Market	0.220%	0.000%	32,500	0	2024-03-31
NT R2000 Growth Index Fund - NL	0.213%	0.000%	31,432	0	2023-12-31
DFA US Core Equity 2 I	0.213%	-10.974%	30,958	-3,816	2024-02-29
NT R2000 Index Fund - NL	0.204%	0.076%	30,170	23	2024-03-31
BlackRock Extended Equity Market K	0.202%	-0.097%	29,894	-29	2024-06-30
Fidelity Total Market Index	0.195%	0.000%	28,782	0	2024-05-31
DFA US Core Equity 1 I	0.187%	0.000%	26,708	0	2023-06-30
iShares Micro-Cap ETF	0.171%	0.000%	24,440	0	2023-06-30
NT R2000 Index Fund - DC - NL - 2	0.162%	0.918%	23,959	218	2024-03-31
Schwab Small Cap Index	0.162%	0.000%	23,947	0	2024-04-30
NT R2000 Growth Index Fund - L	0.153%	0.000%	22,661	0	2024-03-31
Northern Trust Russell 2000 Growth Index	0.153%	0.000%	22,661	0	2024-03-31
iShares Russell 2000 Small-Cap Idx Instl	0.141%	0.000%	20,778	0	2024-04-30
Russell 2000 Index Non-Lendable Fund E	0.132%	8.033%	19,581	1,456	2024-03-31
Fidelity Series Total Market Index	0.129%	0.000%	19,085	0	2024-05-31
Fidelity® Series Total Market Index	0.132%	0.000%	18,876	0	2023-05-31
State St Russell All Cap® Indx NL Cl C	0.121%	0.000%	17,900	0	2024-06-30
BlackRock Russell 2500™ Index F	0.114%	0.042%	16,790	7	2024-03-31
The Vanguard Russell 2000 Growth Index	0.113%	-1.852%	16,697	-315	2024-03-31
NT Ext Equity Mkt Idx Fd - L	0.107%	23.280%	15,855	2,994	2024-06-30
NT Ext Equity Mkt Idx Fd - NL	0.094%	0.000%	13,875	0	2024-03-31
Nuveen Small Cap Blend Idx R6	0.093%	0.000%	13,719	0	2024-04-30
Dimensional US Small Cap ETF	0.095%	0.000%	13,521	0	2023-06-22
Northern Trust Extended Eq Market Idx	0.087%	0.000%	12,861	0	2024-03-31
Vanguard Instl Ttl Stk Mkt Idx InstlPls	0.091%	0.000%	12,140	0	2022-11-30
NT Ext Equity Mkt Idx Fd - DC - NL - T2	0.075%	-0.045%	11,145	-5	2024-06-30
Vanguard US Minimum Volatility ETF	0.073%	98.372%	10,843	5,377	2024-03-31
iShares Core S&P Total US Stock Mkt ETF	0.070%	0.050%	9,961	5	2023-03-31
DFA US Vector Equity I	0.069%	0.000%	9,794	0	2023-02-28