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Detailed Insider History for:
ATRIUM THERAPEUTICS INC: RNA
Price: 2/20/26 52-Wk
High		 52-Wk
Low		 Mkt Cap (mm) Shrs Out (mm) 3-Mth Ave
Vol (m)		 Ind. Yield Short Int
% Float		 Inst. Owned Insider Owned
$72.86 $73.06 $21.51 $11,255 155 2,172 0.0% 5.7% 92.73% 3.72%
Exch Sector Industry Sub-Industry
NasdaqGM Manufacturing Chemicals And Allied Products Pharmaceutical Preparations
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Insider Statistics
T N H M S
Filer Name
Insider Title
Trans Type
Dollar Value
Shares Traded
Trans Date From
Trans Date To
Trans Price From
Trans Price To
Total Holdings
Delta % Owned
Owned
Other Info
Input Date
1
    
 
WILSON TROY EDWARD
DIR
3
---
---
---
2/26/26
---
---
1,371
---
I
---
2/26/26 - 6:21:53 pm
2
    
 
WILSON TROY EDWARD
DIR
3
---
---
---
2/26/26
---
---
10,360
---
D
---
2/26/26 - 6:21:53 pm
3
    
 
KENNEY STEPHANIE
O
3
---
---
---
2/26/26
---
---
5,460
---
D
---
2/26/26 - 6:20:25 pm
4
    
 
FLANAGAN W MICHAEL
DIR
3
---
---
---
2/26/26
---
---
54,786
---
D
---
2/26/26 - 6:16:39 pm
5
    
 
BOESS CARSTEN
DIR
3
---
---
---
2/26/26
---
---
11,005
---
D
---
2/26/26 - 6:16:28 pm
6
    
 
BOYCE SARAH
DIR
3
---
---
---
2/26/26
---
---
265,086
---
D
---
2/26/26 - 6:16:15 pm
7
    
 
GALLAGHER KATHLEEN P
DIR
3
---
---
---
2/26/26
---
---
28,861
---
D
---
2/26/26 - 6:13:09 pm
8
    
 
WINSLOW BRENDAN R
CFO
3
---
---
---
2/26/26
---
---
13,601
---
D
---
2/26/26 - 6:13:06 pm
9
    
 
YOUNIS HUSAM
O
3
---
---
---
2/26/26
---
---
22,657
---
D
---
2/26/26 - 6:11:31 pm
10
    
 
SKERJANEC SIMONA
DIR
3
---
---
---
2/26/26
---
---
5,902
---
D
---
2/26/26 - 6:10:49 pm
11
    
 
HUGHES STEVEN GEORGE
O
3
---
---
---
2/26/26
---
---
43,097
---
D
---
2/26/26 - 6:06:48 pm
12
    
 
HOYOS ROCIO MARTIN
O
3
---
---
---
2/26/26
---
---
16,660
---
D
---
2/26/26 - 6:05:46 pm
13
1y
1
0%
141%
2
HUGHES STEVEN GEORGE
O
AS
$354,643
4,895
---
1/21/26
---
$72.45
31,599
-13.4
D
10b
1/23/26 - 5:34:07 pm
14
1y
16
44%
23%
5
BOYCE SARAH
PR,CEO,DIR
AS
$1,042,338
14,387
---
1/21/26
---
$72.45
269,007
-5.1
D
10b
1/23/26 - 5:34:02 pm
15
    
 
FLANAGAN W MICHAEL
O
AS
$473,388
6,534
---
1/21/26
---
$72.45
85,093
-7.1
D
10b
1/23/26 - 5:33:56 pm
16
1y
9
33%
57%
2
MACLEAN MICHAEL F
CFO
AS
$329,068
4,542
---
1/21/26
---
$72.45
59,290
-7.1
D
10b
1/23/26 - 5:33:51 pm
17
1y
24
58%
1%
3
LEVIN ARTHUR A
DIR
AS
$127,367
1,758
---
1/21/26
---
$72.45
16,562
-9.6
D
10b
1/23/26 - 5:33:46 pm
18
    
 
MCCARTHY TERESA
HR
AS
$212,206
2,929
---
1/21/26
---
$72.45
113,938
-2.5
D
10b
1/23/26 - 5:33:42 pm
19
1y
16
44%
23%
5
BOYCE SARAH
PR,CEO,DIR
AS
$619,445
8,576
---
1/7/26
---
$72.23
283,394
-2.9
D
10b
1/9/26 - 5:13:17 pm
20
    
 
CALDERARO CHARLES III
CTO
AS
$269,201
3,727
---
1/7/26
---
$72.23
49,797
-7.0
D
10b
1/9/26 - 5:13:10 pm
21
    
 
MCCARTHY TERESA
HR
AS
$141,932
1,965
---
1/7/26
---
$72.23
116,867
-1.7
D
10b
1/9/26 - 5:13:03 pm
22
6m
1
0%
91%
2
MORIARTY JOHN B
LO
AS
$171,474
2,374
---
1/7/26
---
$72.23
74,557
-3.1
D
10b
1/9/26 - 5:12:57 pm
23
1y
9
33%
57%
2
MACLEAN MICHAEL F
CFO
AS
$142,582
1,974
---
1/7/26
---
$72.23
63,832
-3.0
D
10b
1/9/26 - 5:12:51 pm
24
1y
1
0%
141%
2
HUGHES STEVEN GEORGE
O
AS
$171,402
2,373
---
1/7/26
---
$72.23
36,494
-6.1
D
10b
1/9/26 - 5:12:44 pm
25
    
 
FLANAGAN W MICHAEL
O
AS
$171,402
2,373
---
1/7/26
---
$72.23
91,627
-2.5
D
10b
1/9/26 - 5:12:37 pm
26
    
 
LEVIN ARTHUR A
DIR
JS
---
1,330
---
12/19/25
---
---
18,320
-6.8
D
---
12/22/25 - 6:36:00 pm
27
    
 
BOYCE SARAH
PR,CEO,DIR
JS
$1,131,378
44,901
12/17/25
12/18/25
---
$71.87
291,970
-13.3
D
R
12/19/25 - 8:27:38 am
28
    
 
CALDERARO CHARLES III
CTO
JS
$699,008
9,726
---
12/17/25
---
$71.87
53,524
-15.4
D
R
12/19/25 - 8:30:49 am
29
    
 
CALDERARO CHARLES III
CTO
JB
---
23,250
---
12/17/25
---
---
63,250
58.1
D
R
12/19/25 - 8:30:49 am
30
    
 
FLANAGAN W MICHAEL
O
JS
$984,260
13,695
---
12/17/25
---
$71.87
94,000
-12.7
D
R
12/19/25 - 8:30:03 am
31
    
 
FLANAGAN W MICHAEL
O
JB
---
27,500
---
12/17/25
---
---
107,695
34.3
D
R
12/19/25 - 8:30:03 am
32
    
 
MOSBROOKER ERIC
O
JS
$3,449,041
47,990
---
12/17/25
---
$71.87
79,010
-37.8
D
R
12/19/25 - 8:29:16 am
33
    
 
MOSBROOKER ERIC
O
JB
---
72,000
---
12/17/25
---
---
127,000
130.9
D
R
12/19/25 - 8:29:16 am
34
    
 
BOYCE SARAH
PR,CEO,DIR
JB
---
31,000
---
12/17/25
---
---
336,871
10.1
D
R
12/19/25 - 8:27:38 am
35
    
 
MORIARTY JOHN B
LO
JS
$1,927,841
26,824
---
12/17/25
---
$71.87
76,931
-25.9
D
R
12/19/25 - 8:26:08 am
36
    
 
MORIARTY JOHN B
LO
JB
---
56,000
---
12/17/25
---
---
103,755
117.3
D
R
12/19/25 - 8:26:08 am
37
    
 
GALLAGHER KATHLEEN P
O
JS
$2,972,975
41,366
---
12/17/25
---
$71.87
80,838
-33.8
D
R
12/19/25 - 8:24:01 am
38
    
 
GALLAGHER KATHLEEN P
O
JB
---
72,000
---
12/17/25
---
---
122,204
143.4
D
R
12/19/25 - 8:24:01 am
39
    
 
MCCARTHY TERESA
HR
JS
$1,243,207
17,298
---
12/17/25
---
$71.87
118,832
-12.7
D
R
12/19/25 - 8:22:57 am
40
    
 
MCCARTHY TERESA
HR
JB
---
39,000
---
12/17/25
---
---
136,130
40.2
D
R
12/19/25 - 8:22:57 am
41
1y
1
0%
141%
2
HUGHES STEVEN GEORGE
O
OS
$105,015
2,209
---
10/22/25
---
$47.54
38,867
-5.4
D
10b
10/24/25 - 4:56:40 pm
42
    
 
HUGHES STEVEN GEORGE
O
OE
$22,443
2,209
---
10/22/25
---
$10.16
41,076
5.7
D
10b
10/24/25 - 4:56:40 pm
43
    
 
MCCARTHY TERESA
HR
OS
$1,003,058
20,000
---
10/15/25
---
$50.15
97,130
-17.1
D
10b
10/17/25 - 4:27:05 pm
44
    
 
MCCARTHY TERESA
HR
OE
$446,800
20,000
---
10/15/25
---
$22.34
117,130
20.6
D
10b
10/17/25 - 4:27:05 pm
45
    
 
MOSBROOKER ERIC
O
OS
$297,771
6,562
---
10/3/25
---
$45.38
55,000
-10.7
D
10b
10/7/25 - 4:11:08 pm
46
    
 
MOSBROOKER ERIC
O
OE
$59,386
6,562
---
10/3/25
---
$9.05
61,562
11.9
D
10b
10/7/25 - 4:11:08 pm
47
1y
1
0%
141%
2
HUGHES STEVEN GEORGE
O
OS
$89,601
2,208
---
9/22/25
---
$40.58
38,867
-5.4
D
10b
9/23/25 - 4:57:37 pm
48
    
 
HUGHES STEVEN GEORGE
O
OE
$22,433
2,208
---
9/22/25
---
$10.16
41,075
5.7
D
10b
9/23/25 - 4:57:37 pm
49
    
 
MCCARTHY TERESA
HR
OS
$621,143
15,000
---
9/15/25
---
$41.41
97,130
-13.4
D
10b
9/17/25 - 4:03:37 pm
50
    
 
MCCARTHY TERESA
HR
OE
$335,100
15,000
---
9/15/25
---
$22.34
112,130
15.4
D
10b
9/17/25 - 4:03:37 pm
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