NAMS
NEWAMST PH CO (NAMS)
NASDAQ
$19.34-$1.38 (-6.67%)
Price as of Nov 12, 2026 10:20 AM EST
  • $2.3B
    Market Cap
  • -45.91%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
FRAZIER LIFE SCIENCES MANAGEMENT, L.P.
15.08%
18.1M
+1.1M (+6.33%)
Jun 30, 2026
CAPITAL WORLD INVESTORS
10.20%
12.2M
+1.1M (+9.17%)
Jun 30, 2026
FMR LLC
10.10%
12.1M
+1.8M (+14.67%)
Sep 30, 2026
RA CAPITAL MANAGEMENT, L.P.
7.96%
9.6M
0 (0.00%)
Jun 30, 2026
FCPM III SERVICES B.V.
7.08%
8.5M
-708,547 (-8.35%)
Jun 30, 2026
DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C)
3.56%
4.3M
0 (0.00%)
Jun 30, 2026
VIKING GLOBAL INVESTORS LP
3.51%
4.2M
0 (0.00%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions916.7M (96.74%)
  • Insiders17.6M (1.86%)
  • Mutual Funds13.3M (1.40%)
  • Other0 (0.00%)

Insider Transactions

  • 1.86% (17.6M)
    Current InsiderOwnership (%, shares)
  • 1
    Number of InsiderBuying (last 12 months)
  • $17.7M
    Amount of InsiderBuying (last 12 months)
  • 6
    Number of InsiderSelling (last 12 months)
  • $133.5M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Davidson Michael H.
Chief Executive Officer
Buy
Sep 14, 2026
$226,500.00
10,000
$22.65
792,923
Smither John W
Sell
Sep 04, 2026
$40,512.00
1,600
$25.32
8,760
Gunning Robert William
Vice President, Controller
Award
Sep 01, 2026
$0.00
14,000
$0.00
14,000
Gunning Robert William
Vice President, Controller
Award
Sep 01, 2026
$0.00
3,200
$0.00
3,200
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jul 20, 2026
$0.00
25,000
$0.00
10,000
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jul 20, 2026
$0.00
80,000
$0.00
70,494
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jul 20, 2026
$297,500.00
25,000
$11.90
49,353
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jul 20, 2026
$893,600.00
80,000
$11.17
129,353
Kooij Louise Frederika
Chief Accounting Officer
Sell
Jul 20, 2026
$2.1M
70,200
$29.96
59,153
Kooij Louise Frederika
Chief Accounting Officer
Sell
Jul 20, 2026
$990,029.25
31,885
$31.05
27,268
Kooij Louise Frederika
Chief Accounting Officer
Sell
Jul 20, 2026
$92,434.65
2,915
$31.71
24,353
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jun 22, 2026
$0.00
25,000
$0.00
43,134
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jun 22, 2026
$0.00
15,000
$0.00
35,000
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jun 22, 2026
$272,500.00
25,000
$10.90
49,353
Kooij Louise Frederika
Chief Accounting Officer
Exempt
Jun 22, 2026
$178,500.00
15,000
$11.90
64,353
Kooij Louise Frederika
Chief Accounting Officer
Sell
Jun 22, 2026
$1.2M
39,700
$30.20
24,653
Kooij Louise Frederika
Chief Accounting Officer
Sell
Jun 22, 2026
$9,219.00
300
$30.73
24,353
LANGE LOUIS G
Sell
Mar 11, 2026
$1.3M
44,173
$30.41
10,806
LANGE LOUIS G
Sell
Mar 11, 2026
$13,928.58
446
$31.23
10,360
LANGE LOUIS G
In The Money
Mar 09, 2026
$0.00
44,619
$0.00
0
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exempt
Mar 09, 2026
$0.00
101,409
$0.00
520,229
LANGE LOUIS G
In The Money
Mar 09, 2026
$513,118.50
44,619
$11.50
54,979
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exempt
Mar 09, 2026
$0.00
101,409
$0.00
170,711
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sell
Mar 09, 2026
$3.1M
101,409
$30.29
69,302
LANGE LOUIS G
Sell
Mar 06, 2026
$828,950.26
28,186
$29.41
0
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exempt
Mar 06, 2026
$0.00
94,124
$0.00
163,426
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sell
Mar 06, 2026
$2.9M
94,124
$30.32
69,302
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exempt
Mar 06, 2026
$0.00
94,124
$0.00
621,638
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exempt
Mar 05, 2026
$0.00
104,467
$0.00
173,769
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sell
Mar 05, 2026
$3.2M
104,467
$30.30
69,302