AMPX
AMPRIUS TECH (AMPX)
NYSE
$7.98-$0.37 (-4.42%)
Price as of Nov 13, 2026 12:46 PM EST
  • $1.2B
    Market Cap
  • -28.75%
    1-Year Change
  • Electrical Equipment & Parts
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
BLACKROCK, INC.
7.76%
11.3M
+2.1M (+18.61%)
Jun 30, 2026
VANGUARD GROUP INC
4.88%
7.1M
+616,037 (+8.64%)
Dec 31, 2025
VANGUARD CAPITAL MANAGEMENT LLC
3.81%
5.6M
+654,110 (+11.76%)
Jun 30, 2026
MORGAN STANLEY
3.49%
5.1M
+1.9M (+38.06%)
Jun 30, 2026
JANE STREET GROUP, LLC
3.16%
4.6M
+3.5M (+74.77%)
Jun 30, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP
3.13%
4.6M
-595,700 (-13.05%)
Jun 30, 2026
STEPHENS INVESTMENT MANAGEMENT GROUP LLC
3.02%
4.4M
+3.7M (+83.80%)
Sep 30, 2026

Current Ownership Distribution

  • Institutions467.2M (66.60%)
  • Mutual Funds150.3M (21.43%)
  • Insiders84.0M (11.97%)
  • Other0 (0.00%)

Insider Transactions

  • 11.97% (84.0M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 4
    Number of InsiderSelling (last 12 months)
  • $158.5M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Stepien Thomas M
Chief Executive Officer
Gift
Aug 25, 2026
$0.00
5,000
$0.00
589,096
Stepien Thomas M
Chief Executive Officer
Gift
Aug 25, 2026
$0.00
5,000
$0.00
584,096
Stepien Thomas M
Chief Executive Officer
Gift
Aug 25, 2026
$0.00
5,000
$0.00
579,096
Stepien Thomas M
Chief Executive Officer
Gift
Aug 25, 2026
$0.00
346
$0.00
578,750
Stepien Thomas M
Chief Executive Officer
Award
Aug 25, 2026
$0.00
346
$0.00
37,260
Stepien Thomas M
Chief Executive Officer
Sell
Aug 24, 2026
$80,240.00
8,000
$10.03
594,096
Stefan Constantin Ionel
Chief Technology Officer
Sell
Aug 21, 2026
$306,931.22
29,681
$10.34
771,629
Sun Kang
Sell
Aug 21, 2026
$642,186.44
62,101
$10.34
1.2M
Stepien Thomas M
Chief Executive Officer
Sell
Aug 21, 2026
$243,313.39
23,529
$10.34
602,096
Chu Steven
Award
Jun 12, 2026
$0.00
10,423
$0.00
137,762
SATTERTHWAITE LIVINGSTON
Award
Jun 12, 2026
$0.00
10,423
$0.00
346,506
Sun Kang
Exempt
Apr 01, 2026
$2.3M
1.3M
$1.78
0
Sun Kang
Exempt
Apr 01, 2026
$689,981.60
187,495
$3.68
1.8M
Sun Kang
Exempt
Apr 01, 2026
$2.3M
1.3M
$1.78
2.7M
Sun Kang
Exempt
Apr 01, 2026
$689,981.60
187,495
$3.68
2.8M
Sun Kang
Sell
Apr 01, 2026
$19.7M
1.3M
$15.73
1.6M
Sun Kang
Sell
Apr 01, 2026
$4.2M
249,037
$16.78
1.3M
Chu Steven
Exempt
Mar 12, 2026
$224,833.23
86,143
$2.61
184,108
Chu Steven
Exempt
Mar 12, 2026
$43,041.64
69,422
$0.62
0
Chu Steven
Exempt
Mar 12, 2026
$224,833.23
86,143
$2.61
213,482
Chu Steven
Exempt
Mar 12, 2026
$43,041.64
69,422
$0.62
282,904
Chu Steven
Sell
Mar 12, 2026
$1.9M
100,000
$18.65
182,904
Chu Steven
Sell
Mar 12, 2026
$910,740.00
50,000
$18.21
132,904
Chu Steven
Sell
Mar 12, 2026
$103,145.05
5,565
$18.53
127,339
Chu Steven
Exempt
Mar 10, 2026
$64,561.84
104,132
$0.62
293,971
Chu Steven
Sell
Mar 10, 2026
$3.0M
166,632
$17.92
127,339
Chu Steven
Exempt
Mar 10, 2026
$64,561.84
104,132
$0.62
69,422
Stefan Constantin Ionel
Chief Technology Officer
Award
Mar 04, 2026
$0.00
110,000
$0.00
833,330
Stepien Thomas M
Chief Executive Officer
Award
Mar 04, 2026
$0.00
150,000
$0.00
760,000
RODRIGUEZ RICARDO C.
Chief Financial Officer
Award
Mar 04, 2026
$0.00
150,000
$0.00
350,000