Ionis Pharmaceuticals Ownership | Who Owns Ionis Pharmaceuticals?

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Ionis Pharmaceuticals Ownership Summary

Ionis Pharmaceuticals is owned by 67.47% institutional investors, 0.92% insiders, and 31.61% retail investors. Fmr is the largest institutional shareholder, holding 15.27% of IONS shares. Fidelity Growth Compy Commingled Pl S is the top mutual fund, with 6.81% of its assets in Ionis Pharmaceuticals shares.

IONS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Ionis Pharmaceuticals	67.47%	0.92%	31.61%
Sector	Healthcare Stocks	57.39%	9.93%	32.68%
Industry	Biotech Stocks	68.48%	9.65%	21.87%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	22.69M	15.27%	$793.22M
Vanguard group	16.47M	11.09%	$575.88M
T. rowe price investment management	14.17M	9.54%	$495.36M
Blackrock funding, inc. /de	11.67M	7.85%	$407.83M
Capital world investors	11.47M	7.72%	$400.83M
Blackrock	10.32M	7.09%	$491.90M
Wellington management group llp	8.67M	5.84%	$303.18M
Bellevue group	7.87M	5.30%	$275.09M
State street	4.19M	2.88%	$199.72M
Price t rowe associates inc /md/	3.83M	2.58%	$133.79M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Great point partners	505.01K	8.32%	$17.66M
Tweedy, browne	3.25M	7.66%	$113.58M
Bellevue group	7.87M	5.30%	$275.09M
Orion investment	216.00K	3.01%	$7.55M
Privium fund management b.v.	247.27K	2.85%	$11.16M
Sector gamma as	235.84K	2.83%	$8.25M
Deep track capital, lp	1.93M	2.52%	$67.61M
Allostery investments lp	65.00K	2.37%	$2.27M
Sicart associates	185.82K	2.32%	$6.50M
Orbimed advisors	2.82M	2.03%	$98.49M

Top Buyers

Holder	Shares	% Assets	Change
Capital world investors	11.47M	0.06%	3.64M
Ubs group	1.92M	0.01%	1.75M
Norges bank	1.71M	0.01%	1.71M
Vanguard group	16.47M	0.01%	1.42M
Blackrock funding, inc. /de	11.67M	0.01%	852.52K

Top Sellers

Holder	Shares	% Assets	Change
Artisan partners limited partnership	252.63K	0.01%	-1.99M
Bvf inc/il	-	-	-1.45M
Marshall wace, llp	812.31K	0.03%	-1.11M
Balyasny asset management	-	-	-1.08M
Logos global management lp	-	-	-750.00K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.71M	0.01%	1.71M	$59.95M
Camber capital management lp	625.00K	0.51%	625.00K	$21.85M
Vestal point capital, lp	595.00K	1.23%	595.00K	$20.80M
Integral health asset management	250.00K	1.13%	250.00K	$11.91M
Aquatic capital management	230.02K	0.22%	230.02K	$8.04M

Sold Out

Holder	Change
Rothschild investment	-5.00
Voisard asset management group	-10.00
Thurston, springer, miller, herd & titak	-20.00
Rosenberg matthew hamilton	-20.00
Concourse financial group securities	-26.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2024	235	-38.48%	100,254,792	-35.75%	67	0.61%	111	-39.34%	73	-31.78%
Sep 30, 2024	378	0.27%	156,005,896	8.92%	104	1.08%	182	3.41%	106	-17.83%
Jun 30, 2024	375	-2.60%	143,227,487	1.66%	98	1.02%	176	2.92%	127	0.79%
Mar 31, 2024	385	1.05%	140,888,836	-0.88%	98	1.00%	171	-9.04%	126	5.88%
Dec 31, 2023	381	17.59%	142,138,886	2.61%	99	1.06%	188	38.24%	119	10.19%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Fidelity Growth Compy Commingled Pl S	10.82M	6.81%	45.64K
Fidelity Growth Compy Commingled Pl O	9.71M	6.16%	90.97K
BB Biotech AG Ord	7.85M	4.97%	-
Fidelity Growth Company Fund	7.60M	4.78%	58.80K
Vanguard Health Care Inv	5.73M	3.63%	-
T. Rowe Price Mid-Cap Growth	5.70M	3.59%	-
T. Rowe Price US Mid-Cap Growth Equity	5.28M	3.34%	-22.90K
Vanguard Total Stock Mkt Idx Inv	4.81M	3.02%	3.69K
Vanguard US Total Market Shares ETF	4.50M	2.83%	256.36K
American Funds SMALLCAP World A	4.06M	2.57%	1.89M

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 11, 2025	Monia Brett P	Chief Executive Officer	Sell	$4.52K
Feb 20, 2025	O'NEIL PATRICK R.	EVP CLO & General Counsel	Sell	$39.05K
Feb 04, 2025	O'NEIL PATRICK R.	EVP CLO & General Counsel	Sell	$194.94K
Feb 04, 2025	Monia Brett P	Chief Executive Officer	Sell	$1.23M
Jan 31, 2025	Swayze Eric	EVP Research	Sell	$44.16K

Insider Transactions Trends

Date	Buy	Sell
2025 Q1	-	23
2024 Q4	2	4
2024 Q3	-	6
2024 Q2	-	9
2024 Q1	-	33

IONS Ownership FAQ

Who Owns Ionis Pharmaceuticals?

Ionis Pharmaceuticals shareholders are primarily institutional investors at 67.47%, followed by 0.92% insiders and 31.61% retail investors. The average institutional ownership in Ionis Pharmaceuticals's industry, Biotech Stocks , is 68.48%, which Ionis Pharmaceuticals falls below.

Who owns the most shares of Ionis Pharmaceuticals?

Ionis Pharmaceuticals’s largest shareholders are Fmr (22.69M shares, 15.27%), Vanguard group (16.47M shares, 11.09%), and T. rowe price investment management (14.17M shares, 9.54%). Together, they hold 35.89% of Ionis Pharmaceuticals’s total shares outstanding.

Does Blackrock own Ionis Pharmaceuticals?

Yes, BlackRock owns 7.09% of Ionis Pharmaceuticals, totaling 10.32M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 491.9M$. In the last quarter, BlackRock increased its holdings by 549.14K shares, a 5.62% change.

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

Great point partners is Ionis Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 8.32% of its assets in 505.01K Ionis Pharmaceuticals shares, valued at 17.66M$.

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

Fidelity Growth Compy Commingled Pl S is the top mutual fund holder of Ionis Pharmaceuticals shares, with 6.81% of its total shares outstanding invested in 10.82M Ionis Pharmaceuticals shares.

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