Marinus Pharmaceuticals Ownership | Who Owns Marinus Pharmaceuticals?

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Marinus Pharmaceuticals Ownership Summary

Marinus Pharmaceuticals is owned by 50.90% institutional investors, 10.94% insiders, and 38.16% retail investors. Blackrock is the largest institutional shareholder, holding 3.29% of MRNS shares. Franklin Biotechnology Discv A(acc)USD is the top mutual fund, with 5.42% of its assets in Marinus Pharmaceuticals shares.

MRNS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Marinus Pharmaceuticals	50.90%	10.94%	38.16%
Sector	Healthcare Stocks	279.19%	10.62%	-189.81%
Industry	Biotech Stocks	63.96%	10.74%	25.30%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	1.87M	3.29%	$2.19M
Acadian asset management	696.74K	1.22%	$371.00K
Jacobs levy equity management	297.01K	0.52%	$347.51K
Royal bank of canada	249.14K	0.44%	$134.00K
State street	206.48K	0.36%	$241.58K
Morgan stanley	179.81K	0.32%	$210.38K
Susquehanna group, llp	100.85K	0.18%	$53.97K
Bank of america corp /de/	75.35K	0.13%	$88.16K
Barclays	36.40K	0.06%	$41.00K
Aqr capital management	31.33K	0.06%	$36.66K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Jacobs levy equity management	297.01K	0.00%	$347.51K
Acadian asset management	696.74K	0.00%	$371.00K
Aqr capital management	31.33K	0.00%	$36.66K
Woodline partners lp	-	-	-
Voya investment management	-	-	-
Proshare advisors	-	-	-
Geode capital management	-	-	-
Abrdn	-	-	-
Legal & general group	-	-	-
Prudential financial	-	-	-

Top Buyers

Holder	Shares	% Assets	Change
Jacobs levy equity management	297.01K	0.00%	254.56K
Royal bank of canada	249.14K	-	187.38K
Susquehanna group, llp	100.85K	-	26.97K
Aqr capital management	31.33K	0.00%	12.93K
Macquarie group	2.75K	-	2.75K

Top Sellers

Holder	Shares	% Assets	Change
Suvretta capital management	-	-	-5.07M
Franklin resources	-	-	-4.71M
Sofinnova investments	-	-	-4.39M
Beryl capital management	-	-	-4.23M
Avoro capital advisors	-	-	-4.14M

New Positions

Holder	Shares	% Assets	Change	Value
Macquarie group	2.75K	-	2.75K	$3.22K

Sold Out

Holder	Change
Nelson, van denburg & campbell wealth management group	-11.00
Point72 (difc)	-21.00
Quadrant capital group	-22.00
Harbor investment advisory	-37.00
Gamma investing	-56.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2024	53	-33.75%	29,127,098	-29.59%	50	0.97%	20	-41.18%	21	-16.00%
Sep 30, 2024	80	-13.04%	41,366,247	-4.36%	72	1.25%	35	-32.69%	25	-16.67%
Jun 30, 2024	92	-31.85%	43,253,724	-19.62%	76	0.85%	52	-21.21%	30	-14.29%
Mar 31, 2024	135	10.66%	53,814,604	-0.04%	94	0.94%	66	11.86%	35	2.94%
Dec 31, 2023	122	3.39%	53,838,206	5.47%	100	1.12%	59	3.51%	34	6.25%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Franklin Biotechnology Discv A(acc)USD	2.99M	5.42%	694.60K
Franklin Biotechnology Discovery A	1.73M	3.13%	525.20K
Vanguard Total Stock Mkt Idx Inv	1.73M	3.13%	-
abrdn Healthcare Investors	1.53M	2.77%	-1.56K
abrdn Life Sciences Investors	1.12M	2.04%	-1.14K
PGIM Jennison Health Sciences Z	844.04K	1.53%	-
Jennison Health Sciences Equity	844.04K	1.53%	-882.35K
Vanguard Institutional Extnd Mkt Idx Tr	811.00K	1.47%	-
iShares Biotechnology ETF	337.13K	0.61%	-
International Biotechnology Ord	290.00K	0.53%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 14, 2024	Braunstein Scott	CHAIRMAN AND CEO	Buy	$6.53K
Jan 21, 2025	Ezickson Elan	-	Sell	$864.00
Jan 21, 2025	Johnson Marvin	-	Sell	$869.40
Aug 05, 2024	Pfanstiel Steven	CFO AND COO	Sell	$5.26K
Aug 05, 2024	Shafer Christina	CHIEF COMMERCIAL OFFICER	Sell	$4.35K

Insider Transactions Trends

Date	Buy	Sell
2025 Q1	-	2
2024 Q4	-	-
2024 Q3	-	5
2024 Q2	-	-
2024 Q1	-	5

MRNS Ownership FAQ

Who Owns Marinus Pharmaceuticals?

Marinus Pharmaceuticals shareholders are primarily institutional investors at 50.90%, followed by 10.94% insiders and 38.16% retail investors. The average institutional ownership in Marinus Pharmaceuticals's industry, Biotech Stocks , is 63.96%, which Marinus Pharmaceuticals falls below.

Who owns the most shares of Marinus Pharmaceuticals?

Marinus Pharmaceuticals’s largest shareholders are Blackrock (1.87M shares, 3.29%), Acadian asset management (696.74K shares, 1.22%), and Jacobs levy equity management (297.01K shares, 0.52%). Together, they hold 5.03% of Marinus Pharmaceuticals’s total shares outstanding.

Does Blackrock own Marinus Pharmaceuticals?

Yes, BlackRock owns 3.29% of Marinus Pharmaceuticals, totaling 1.87M shares as of Jun 2024. This represents 0% of BlackRock's total assets, with a market value of 2.19M$. In the last quarter, BlackRock decreased its holdings by -2.851M shares, a -60.39% change.

Who is Marinus Pharmaceuticals’s biggest shareholder by percentage of total assets invested?

Jacobs levy equity management is Marinus Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 0.00% of its assets in 297.01K Marinus Pharmaceuticals shares, valued at 347.51K$.

Who is the top mutual fund holder of Marinus Pharmaceuticals shares?

Franklin Biotechnology Discv A(acc)USD is the top mutual fund holder of Marinus Pharmaceuticals shares, with 5.42% of its total shares outstanding invested in 2.99M Marinus Pharmaceuticals shares.

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