Arrowhead Pharmaceuticals Ownership | Who Owns Arrowhead Pharmaceuticals?

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Arrowhead Pharmaceuticals Ownership Summary

Arrowhead Pharmaceuticals is owned by 75.92% institutional investors, 13.08% insiders, and 11.01% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 13.97% of ARWR shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 5.41% of its assets in Arrowhead Pharmaceuticals shares.

ARWR Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Arrowhead Pharmaceuticals	75.92%	13.08%	11.01%
Sector	Healthcare Stocks	487.91%	11.08%	-398.99%
Industry	Biotech Stocks	307.10%	11.11%	-218.21%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	19.42M	13.97%	$306.91M
Blackrock	15.68M	12.72%	$407.61M
Vanguard group	12.18M	10.17%	$229.06M
Avoro capital advisors	10.60M	7.62%	$167.48M
State street	6.02M	4.82%	$113.11M
Fmr	5.10M	4.26%	$95.90M
Slate path capital lp	5.23M	3.76%	$82.67M
Geode capital management	2.95M	2.47%	$55.57M
Siren	2.67M	1.92%	$42.18M
Norges bank	2.05M	1.72%	$38.62M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Aquilo capital management	707.59K	20.06%	$13.30M
Western financial corp/ca	820.24K	12.31%	$28.29M
Avoro capital advisors	10.60M	2.93%	$167.48M
Siren	2.67M	2.18%	$42.18M
Wealth effects	168.45K	1.87%	$5.81M
M28 capital management lp	67.40K	1.82%	$1.06M
Privium fund management b.v.	380.59K	1.62%	$7.16M
Slate path capital lp	5.23M	1.43%	$82.67M
Johnson & johnson	247.60K	1.19%	$3.98M
Pinion investment advisors	75.00K	0.78%	$2.85M

Top Buyers

Holder	Shares	% Assets	Change
Marshall wace, llp	2.16M	0.04%	2.10M
Norges bank	2.05M	0.01%	2.05M
Baker bros. advisors lp	939.17K	0.14%	939.17K
Ubs group	1.31M	0.00%	863.82K
Morgan stanley	1.82M	0.00%	679.41K

Top Sellers

Holder	Shares	% Assets	Change
T. rowe price investment management	822.34K	0.01%	-1.71M
Fmr	5.10M	0.01%	-966.49K
Rokos capital management llp	-	-	-939.98K
Orbimed advisors	-	-	-739.65K
E. ohman j:or asset management ab	-	-	-714.21K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.05M	0.01%	2.05M	$38.62M
Baker bros. advisors lp	939.17K	0.14%	939.17K	$14.84M
Pdt partners	152.99K	0.14%	152.99K	$2.42M
Hbk sorce advisory	76.41K	0.07%	76.41K	$2.82M
Alps advisors	74.50K	0.01%	74.50K	$1.18M

Sold Out

Holder	Change
Toronto dominion bank	-3.00
Financial gravity asset management	-4.00
Assetmark	-6.00
Innealta capital	-11.00
Advisornet financial	-12.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	293	6.55%	105,554,949	2.21%	75	1.29%	151	19.84%	79	-2.47%
Mar 31, 2025	275	-4.84%	103,269,262	3.49%	76	1.20%	128	-7.25%	80	-8.05%
Dec 31, 2024	285	1.42%	99,767,650	4.15%	79	1.25%	133	7.26%	88	-3.30%
Sep 30, 2024	278	-1.77%	95,591,794	-2.21%	76	1.22%	124	-8.15%	89	7.23%
Jun 30, 2024	282	-1.40%	97,756,300	2.92%	79	1.34%	135	-7.53%	82	7.89%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	7.47M	5.41%	-
iShares Core S&P Mid-Cap ETF	4.05M	3.25%	13.43K
Vanguard Total Stock Mkt Idx Inv	3.79M	2.74%	-80.50K
Vanguard US Total Market Shares ETF	3.70M	2.70%	3.98K
iShares Russell 2000 ETF	2.91M	2.11%	-
Vanguard Small Cap Index	2.85M	2.06%	-17.58K
Fidelity Growth Compy Commingled Pl S	2.45M	1.77%	177.56K
Fidelity Growth Company Fund	1.76M	1.27%	131.28K
SPDR® S&P Biotech ETF	1.73M	1.25%	3.86K
Vanguard Small Cap Growth Index Inv	1.61M	1.17%	-1.76K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Oct 01, 2025	Hamilton James C	Chief Medical Officer	Sell	$700.00K
Sep 12, 2025	Hamilton James C	Chief Medical Officer	Sell	$450.00K
Sep 02, 2025	Hamilton James C	Chief Medical Officer	Sell	$375.00K
Aug 15, 2025	Hamilton James C	Chief Medical Officer	Sell	$187.78K
Aug 13, 2025	Hamilton James C	Chief Medical Officer	Sell	$12.22K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	1
2025 Q3	-	4
2025 Q2	-	5
2025 Q1	-	14
2024 Q4	-	10

ARWR Ownership FAQ

Who Owns Arrowhead Pharmaceuticals?

Arrowhead Pharmaceuticals shareholders are primarily institutional investors at 75.92%, followed by 13.08% insiders and 11.00% retail investors. The average institutional ownership in Arrowhead Pharmaceuticals's industry, Biotech Stocks , is 307.10%, which Arrowhead Pharmaceuticals falls below.

Who owns the most shares of Arrowhead Pharmaceuticals?

Arrowhead Pharmaceuticals’s largest shareholders are Blackrock funding, inc. /de (19.42M shares, 13.97%), Blackrock (15.68M shares, 12.72%), and Vanguard group (12.18M shares, 10.17%). Together, they hold 36.86% of Arrowhead Pharmaceuticals’s total shares outstanding.

Does Blackrock own Arrowhead Pharmaceuticals?

Yes, BlackRock owns 12.72% of Arrowhead Pharmaceuticals, totaling 15.68M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 407.61M$. In the last quarter, BlackRock increased its holdings by 336.57K shares, a 2.19% change.

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

Aquilo capital management is Arrowhead Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 20.06% of its assets in 707.59K Arrowhead Pharmaceuticals shares, valued at 13.3M$.

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

iShares Core S&P Small-Cap ETF is the top mutual fund holder of Arrowhead Pharmaceuticals shares, with 5.41% of its total shares outstanding invested in 7.47M Arrowhead Pharmaceuticals shares.

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