Departure or Appointment of Directors or Certain Officers
→
3/6/26
Agreement
Entry into a Material Definitive Agreement
→
1/12/26
Agreement
Entry into a Material Definitive Agreement
→
10/24/25
Agreement
1.01
→
9/18/25
Agreement
Entry into a Material Definitive Agreement
→
8/12/25
Agreement
Entry into a Material Definitive Agreement
→
↓
Prospectuses & Registrations
34 shown
Filed
Form
Description
4/14/25
ARS
ARS
→
4/12/24
ARS
ARS
→
2/29/24
S-8
S-8
→
4/14/23
ARS
ARS
→
3/1/23
S-8
S-8
→
3/11/22
S-8
S-8
→
↓
Filing History(910 filings)
TypeDateAccessionPeriodSize
4
Mar 6, 2026
0001645326-26-000003
Mar 4, 2026
6.4 KB
4
Mar 6, 2026
0001743927-26-000003
Mar 4, 2026
5.7 KB
4
Mar 6, 2026
0001263136-26-000003
Mar 4, 2026
4.9 KB
8-K
Mar 6, 2026
0001297184-26-0000158-K
Mar 3, 2026
442.3 KB
8-K
Mar 6, 2026
0001297184-26-0000138-K
Mar 3, 2026
644.1 KB
4
Mar 6, 2026
0001104659-26-024842OWNERSHIP DOCUMENT
Mar 4, 2026
8.9 KB
10-K
Feb 26, 2026
0001297184-26-00000910-K
Dec 31, 2025
17.2 MB
8-K
Feb 26, 2026
0001297184-26-0000078-K
Feb 26, 2026
1.0 MB
8-K
Jan 12, 2026
0001297184-26-0000028-K
Jan 6, 2026
214.1 KB
4
Dec 18, 2025
0001645326-25-000004
Dec 17, 2025
10.4 KB
4
Dec 15, 2025
0001611286-25-000011
Dec 11, 2025
6.3 KB
144
Dec 11, 2025
0001969223-25-001078
—
6.4 KB
144
Dec 10, 2025
0001969223-25-001063
—
5.8 KB
144
Nov 28, 2025
0001969223-25-001002
—
4.2 KB
4
Nov 25, 2025
0001047579-25-000006
Nov 25, 2025
8.5 KB
144
Nov 25, 2025
0001969223-25-000996
—
4.2 KB
4
Nov 17, 2025
0001611286-25-000009
Nov 13, 2025
8.5 KB
144
Nov 13, 2025
0001969223-25-000949
—
5.9 KB
10-Q
Nov 6, 2025
0001297184-25-00006410-Q
Sep 30, 2025
13.3 MB
8-K
Nov 6, 2025
0001297184-25-0000628-K
Nov 6, 2025
874.4 KB
4
Nov 5, 2025
0001611286-25-000007
Nov 3, 2025
5.1 KB
144
Nov 3, 2025
0001969223-25-000906
—
5.9 KB
8-K
Oct 24, 2025
0001297184-25-0000581.01
Oct 21, 2025
162.5 KB
SCHEDULE 13G/A
Oct 17, 2025
0002012383-25-001740
—
11.0 KB
4
Oct 2, 2025
0001611286-25-000005
Oct 1, 2025
5.1 KB
25 filings shown
Proxies
26 shown
Filed
Form
Description
4/14/25
DEFA14A
DEFA14A
→
4/14/25
DEF 14A
DEF 14A
→
4/2/25
PRE 14A
PRE 14A
→
4/19/24
DEFA14A
DEFA14A
→
4/12/24
DEFA14A
DEFA14A
→
4/12/24
DEF 14A
DEF 14A
→
↓
Ownership
40 shown
Filed
Form
Description
3/6/26
4
4
→
3/6/26
4
4
→
3/6/26
4
4
→
3/6/26
4
OWNERSHIP DOCUMENT
→
12/18/25
4
4
→
12/15/25
4
4
→
↓
Other Filings
40 shown
Filed
Form
Description
12/11/25
144
144
→
12/10/25
144
144
→
11/28/25
144
144
→
11/25/25
144
144
→
11/13/25
144
144
→
11/3/25
144
144
→
↓
Amphastar Pharmaceuticals is a publicly traded American speciality pharmaceutical company. It was incorporated in May 2004 and primarily develops, manufactures, and sells inhalation and intranasal products.