RNA | ATRIUM THERAP | Owners

S&P 500$7,666.45
+0.19%
2m
DOW 30$50,926.56
+0.04%
2m
NASDAQ 100$30,501.56
+0.31%
2m
Russell 2000$279.02
+0.41%
2m
Russell 1000$416.97
+0.20%
2m
S&P 400$3,633.16
+1.03%
2m
S&P 600$1,665.65
+0.65%
2m

ATRIUM THERAP (RNA)

NASDAQ

$8.10-$0.04 (-0.55%)

Price as of Oct 02, 2026 4:31 PM EDT

$139.2M
Market Cap
-81.58%
1-Year Change
Biotechnology
Industry

Top Holders

Institutional

Mutual Funds

Holder	Ownership %	Shares Held	Change (Shares, %)	Report Date
VANGUARD GROUP INC	79.79%	13.6M	+429,491 (+3.15%)	Dec 31, 2025
RTW INVESTMENTS, LP	66.49%	11.4M	+1.8M (+15.42%)	Sep 30, 2025
BLACKROCK FUNDING, INC. /DE	58.06%	9.9M	+205,447 (+2.07%)	Dec 31, 2024
BLACKROCK INC.	50.41%	8.6M	+2.5M (+28.49%)	Jun 30, 2024
AVORO CAPITAL ADVISORS LLC	31.89%	5.5M	-2.2M (-40.15%)	Dec 31, 2025
RTW INVESTMENTS, LLC	28.03%	4.8M	0 (0.00%)	Dec 31, 2021
HBK INVESTMENTS L P	25.52%	4.4M	+4.4M (+100.00%)	Dec 31, 2025

Holder	Ownership %	Shares Held	Change (Shares, %)	Report Date
FIDELITY CONTRAFUND	6.44%	1.1M	0 (0.00%)	Jun 30, 2026
VANGUARD INDEX FUNDS	4.13%	707,042	-166,381 (-23.53%)	Jun 30, 2026
iSHARES TRUST	3.37%	576,484	0 (0.00%)	Jul 31, 2026
T. Rowe Price Health Sciences Fund, Inc.	3.31%	566,428	-99,897 (-17.64%)	Jun 30, 2026
T. Rowe Price New Horizons Fund, Inc.	2.59%	443,263	-199 (-0.04%)	Jun 30, 2026
LORD ABBETT DEVELOPING GROWTH FUND, INC.	2.38%	406,719	0 (0.00%)	Jul 31, 2026
ACAP Strategic Fund	2.23%	382,045	0 (0.00%)	Jun 30, 2026

Current Ownership Distribution

Institutions1.7B (79.64%)
Mutual Funds414.8M (19.82%)
Insiders11.2M (0.54%)
Other0 (0.00%)

Insider Transactions

0.54% (11.2M)
Current InsiderOwnership (%, shares)
0
Number of InsiderBuying (last 12 months)
$0.00
Amount of InsiderBuying (last 12 months)
8
Number of InsiderSelling (last 12 months)
$127.1M
Amount of InsiderSelling (last 12 months)

Insider Name & Title	Type	Date	Transaction Value	Shares	Share Price	Shares After Transactions
Hoyos Rocio Martin Chief Strategy Officer	In Kind	Sep 18, 2026	$74,464.00	8,320	$8.95	38,340
Boyce Sarah	In Kind	Sep 18, 2026	$1.1M	126,418	$8.95	138,668
Flanagan W. Michael	In Kind	Sep 18, 2026	$204,167.40	22,812	$8.95	31,974
Kim Jean Jinsun	Return	Feb 27, 2026	$0.00	10,034	$0.00	0
Thompson Tamar	Return	Feb 27, 2026	$0.00	10,034	$0.00	0
MacLean Michael F Chief Financial Officer	Return	Feb 27, 2026	$0.00	92,000	$0.00	0
Henig Noreen	Return	Feb 27, 2026	$0.00	10,034	$0.00	0
McCarthy Teresa Chief Human Resources Officer	Return	Feb 27, 2026	$0.00	106,000	$0.00	0
Mosbrooker Eric Chief Commercial Officer	Return	Feb 27, 2026	$0.00	177,188	$0.00	0
Calderaro Charles III Chief Technical Officer	Return	Feb 27, 2026	$0.00	80,000	$0.00	0
Boyce Sarah President and CEO	Return	Feb 27, 2026	$0.00	386,015	$0.00	0
Kim Jean Jinsun	Return	Feb 27, 2026	$0.00	13,489	$0.00	0
Moriarty John B Chief Legal Officer	Return	Feb 27, 2026	$0.00	50,000	$0.00	0
LEVIN ARTHUR A	Return	Feb 27, 2026	$0.00	10,034	$0.00	0
BOESS CARSTEN	Return	Feb 27, 2026	$0.00	10,034	$0.00	0
Flanagan W. Michael Chief Scientific Officer	Return	Feb 27, 2026	$0.00	25,000	$0.00	0
WILSON TROY EDWARD	Return	Feb 27, 2026	$0.00	10,034	$0.00	0
Calderaro Charles III Chief Technical Officer	Return	Feb 27, 2026	$0.00	98,547	$0.00	0
Boyce Sarah President and CEO	Return	Feb 27, 2026	$0.00	300,000	$0.00	0
Kim Jean Jinsun	Return	Feb 27, 2026	$0.00	22,000	$0.00	0
Thompson Tamar	Return	Feb 27, 2026	$0.00	13,489	$0.00	0
MacLean Michael F Chief Financial Officer	Return	Feb 27, 2026	$0.00	131,250	$0.00	0
Henig Noreen	Return	Feb 27, 2026	$0.00	13,489	$0.00	0
McCarthy Teresa Chief Human Resources Officer	Return	Feb 27, 2026	$0.00	65,000	$0.00	0
Skerjanec Simona	Return	Feb 27, 2026	$0.00	10,034	$0.00	0
Hughes Steven George Chief Medical Officer	Return	Feb 27, 2026	$0.00	73,342	$0.00	0
Boyce Sarah President and CEO	Return	Feb 27, 2026	$0.00	425,000	$0.00	0
Kim Jean Jinsun	Return	Feb 27, 2026	$0.00	22,000	$0.00	0
Moriarty John B Chief Legal Officer	Return	Feb 27, 2026	$0.00	160,000	$0.00	0
LEVIN ARTHUR A	Return	Feb 27, 2026	$0.00	13,489	$0.00	0