NAMS
NEWAMST PH CO (NAMS)
NASDAQ
$31.41+$0.59 (+1.90%)
Price as of Jun 23, 2026 6:29 PM EDT
  • $3.5B
    Market Cap
  • 69.25%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
FRAZIER LIFE SCIENCES MANAGEMENT, L.P.
14.49%
16.9M
0 (0.00%)
Mar 31, 2026
CAPITAL WORLD INVESTORS
9.50%
11.1M
+1.1M (+10.13%)
Mar 31, 2026
RA CAPITAL MANAGEMENT, L.P.
8.17%
9.6M
0 (0.00%)
Mar 31, 2026
FCPM III SERVICES B.V.
7.87%
9.2M
0 (0.00%)
Mar 31, 2026
FMR LLC
7.50%
8.8M
+2.4M (+26.84%)
Mar 31, 2026
BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC
6.25%
7.3M
0 (0.00%)
Mar 31, 2026
WELLINGTON MANAGEMENT GROUP LLP
4.38%
5.1M
+82,643 (+1.62%)
Mar 31, 2026

Current Ownership Distribution

  • Institutions772.0M (96.88%)
  • Insiders17.5M (2.20%)
  • Mutual Funds7.3M (0.91%)
  • Other0 (0.00%)

Insider Transactions

  • 2.20% (17.5M)
    Current InsiderOwnership (%, shares)
  • 1
    Number of InsiderBuying (last 12 months)
  • $111.0M
    Amount of InsiderBuying (last 12 months)
  • 6
    Number of InsiderSelling (last 12 months)
  • $140.0M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
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
715,762
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
Davidson Michael H.
Chief Executive Officer
Exempt
Mar 02, 2026
$0.00
443,707
$0.00
239,267
Davidson Michael H.
Chief Executive Officer
Exempt
Mar 02, 2026
$0.00
443,707
$0.00
617,851
Davidson Michael H.
Chief Executive Officer
Sell
Mar 02, 2026
$14.8M
443,707
$33.25
174,144
Davidson Michael H.
Chief Executive Officer
Exempt
Feb 26, 2026
$0.00
183,332
$0.00
643,191
Davidson Michael H.
Chief Executive Officer
Sell
Feb 26, 2026
$5.6M
165,408
$33.63
477,783
Davidson Michael H.
Chief Executive Officer
Sell
Feb 26, 2026
$617,302.56
17,924
$34.44
174,144
Davidson Michael H.
Chief Executive Officer
Exempt
Feb 26, 2026
$0.00
183,332
$0.00
682,974
Davidson Michael H.
Chief Executive Officer
Exempt
Feb 25, 2026
$0.00
58,253
$0.00
518,112
Davidson Michael H.
Chief Executive Officer
Sell
Feb 25, 2026
$1.6M
46,517
$35.11
471,595
Davidson Michael H.
Chief Executive Officer
Sell
Feb 25, 2026
$375,278.56
10,436
$35.96
461,159
Davidson Michael H.
Chief Executive Officer
Sell
Feb 25, 2026
$47,684.00
1,300
$36.68
459,859
Davidson Michael H.
Chief Executive Officer
Exempt
Feb 25, 2026
$0.00
58,253
$0.00
866,306
Davidson Michael H.
Chief Executive Officer
Exempt
Feb 24, 2026
$0.00
64,708
$0.00
924,559
Davidson Michael H.
Chief Executive Officer
Exempt
Feb 24, 2026
$0.00
64,708
$0.00
524,567
Davidson Michael H.
Chief Executive Officer
Sell
Feb 24, 2026
$2.2M
61,547
$36.13
463,020
Davidson Michael H.
Chief Executive Officer
Sell
Feb 24, 2026
$115,250.06
3,161
$36.46
459,859