AMPX
Amprius Technologies, Inc.
Miscellaneous Electrical Machinery, Equipment & SuppliesNYSE<br>Emerging growth company
Total Trades
56
Buys
0
Sells
43
Largest Trade
$1M+
Insiders
5
Institutional Funds
153
Inst. Value
$1M+
Activist Filings
14
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Sun Kang | Director | SELL | $500K+ | 61K | $10.16 | Feb 24, 2026 |
| Stefan Constantin Ionel | CTO | SELL | $100K–$500K | 25K | $10.16 | Feb 24, 2026 |
| Stefan Constantin Ionel | CTO | EXERCISE | $1K–$15K | 40K | $0.05 | Jan 30, 2026 |
| Stefan Constantin Ionel | CTO | SELL | $100K–$500K | 40K | $12.00 | Jan 30, 2026 |
| Stefan Constantin Ionel | CTO | SELL | $1M+ | 568K | $12.03 | Jan 23, 2026 |
| Stefan Constantin Ionel | CTO | EXERCISE | $50K–$100K | 568K | $0.14 | Jan 23, 2026 |
| Sun Kang | Director | SELL | $1M+ | 994K | $11.06 | Jan 20, 2026 |
| Sun Kang | Director | EXERCISE | $1M+ | 994K | $2.40 | Jan 20, 2026 |
| Sun Kang | Director | EXERCISE | $500K+ | 506K | $1.80 | Jan 14, 2026 |
| Sun Kang | Director | SELL | $1M+ | 506K | $10.10 | Jan 14, 2026 |
| Stefan Constantin Ionel | CTO | SELL | $1M+ | 198K | $10.51 | Dec 15, 2025 |
| Stefan Constantin Ionel | CTO | EXERCISE | $1K–$15K | 125K | $0.05 | Dec 15, 2025 |
| Stefan Constantin Ionel | CTO | SELL | $100K–$500K | 25K | $10.08 | Nov 25, 2025 |
| Sun Kang | CEO | SELL | $500K+ | 69K | $10.08 | Nov 25, 2025 |
| Sun Kang | CEO | SELL | $1M+ | 1.0M | $10.60 | Nov 19, 2025 |
| Sun Kang | CEO | EXERCISE | $100K–$500K | 1.0M | $0.28 | Nov 19, 2025 |
| Stefan Constantin Ionel | CTO | SELL | $100K–$500K | 19K | $6.82 | Aug 26, 2025 |
| Wallach Sandra | CFO | SELL | $100K–$500K | 28K | $6.82 | Aug 26, 2025 |
| Sun Kang | CEO | SELL | $100K–$500K | 66K | $6.82 | Aug 25, 2025 |
| Stefan Constantin Ionel | CTO | SELL | $15K–$50K | 20K | $2.43 | May 23, 2025 |
| Wallach Sandra | CFO | SELL | $50K–$100K | 28K | $2.43 | May 23, 2025 |
| Sun Kang | CEO | SELL | $100K–$500K | 70K | $2.43 | May 23, 2025 |
| Sun Kang | CEO | SELL | $100K–$500K | 34K | $3.13 | Feb 25, 2025 |
| Wallach Sandra | CFO | SELL | $50K–$100K | 18K | $3.13 | Feb 25, 2025 |
| Stefan Constantin Ionel | CTO | SELL | $15K–$50K | 9K | $3.13 | Feb 25, 2025 |
| Bornstein Jonathan | President of Ampri… | SELL | $15K–$50K | 14K | $3.13 | Feb 25, 2025 |
| Sun Kang | CEO | SELL | $50K–$100K | 34K | $1.96 | Nov 22, 2024 |
| Bornstein Jonathan | President of Ampri… | SELL | $100K–$500K | 167K | $1.93 | Nov 22, 2024 |
| Wallach Sandra | CFO | SELL | $15K–$50K | 17K | $1.96 | Nov 22, 2024 |
| Stefan Constantin Ionel | CTO | SELL | $15K–$50K | 9K | $1.96 | Nov 22, 2024 |
| Wallach Sandra | CFO | SELL | $15K–$50K | 18K | $1.04 | Aug 22, 2024 |
| Bornstein Jonathan | President of Ampri… | SELL | $15K–$50K | 19K | $1.04 | Aug 22, 2024 |
| Sun Kang | CEO | SELL | $15K–$50K | 33K | $1.04 | Aug 22, 2024 |
| Stefan Constantin Ionel | CTO | SELL | $1K–$15K | 9K | $1.04 | Aug 22, 2024 |
| MIRRO JUSTIN E | Director | SELL | $500K+ | 800K | $1.22 | Jun 14, 2024 |
| Stefan Constantin Ionel | CTO | SELL | $1K–$15K | 9K | $1.34 | May 25, 2024 |
| Sun Kang | See Remarks | SELL | $15K–$50K | 36K | $1.34 | May 25, 2024 |
| Bornstein Jonathan | President of Ampri… | SELL | $15K–$50K | 20K | $1.34 | May 25, 2024 |
| Wallach Sandra | CFO | SELL | $15K–$50K | 19K | $1.34 | May 25, 2024 |
| Bornstein Jonathan | President of Ampri… | SELL | $100K–$500K | 126K | $2.38 | Apr 3, 2024 |
| Bornstein Jonathan | President of Ampri… | EXERCISE | $1K–$15K | 126K | $0.05 | Apr 3, 2024 |
| Bornstein Jonathan | President of Ampri… | SELL | $500K+ | 150K | $4.43 | Feb 7, 2024 |
| Bornstein Jonathan | President of Ampri… | EXERCISE | $1K–$15K | 150K | $0.05 | Feb 7, 2024 |
| Bornstein Jonathan | President of Ampri… | EXERCISE | $1K–$15K | 150K | $0.05 | Jan 4, 2024 |
| Bornstein Jonathan | President of Ampri… | SELL | $500K+ | 150K | $4.44 | Jan 4, 2024 |
| MIRRO JUSTIN E | Director | SELL | $500K+ | 150K | $3.97 | Nov 30, 2023 |
| Bornstein Jonathan | President of Ampri… | SELL | $100K–$500K | 28K | $3.84 | Nov 21, 2023 |
| Bornstein Jonathan | President of Ampri… | EXERCISE | $1K–$15K | 28K | $0.05 | Nov 21, 2023 |
| Bornstein Jonathan | President of Ampri… | SELL | $100K–$500K | 122K | $3.00 | Nov 9, 2023 |
| Bornstein Jonathan | President of Ampri… | EXERCISE | $1K–$15K | 122K | $0.05 | Nov 9, 2023 |
🔓Seeing ranges? Sign in for exact trade values — free forever
Institutional Ownership
13F filings as of Dec 31, 2025 · 153 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| STATE STREET CORP | 2.6M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3M | $1M+ | SH |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | 1.6M | $1M+ | SH |
| Stephens Investment Management Group LLC | 1.4M | $1M+ | SH |
| NORGES BANK | 1.3M | $1M+ | SH |
| Hudson Bay Capital Management LP | 1.1M | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.0M | $1M+ | SH |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 985K | $1M+ | SH |
| VANGUARD GROUP INC | 849K | $1M+ | SH |
| GOLDMAN SACHS GROUP INC | 794K | $1M+ | SH |
| Baird Financial Group, Inc. | 773K | $1M+ | SH |
| BNP PARIBAS FINANCIAL MARKETS | 707K | $1M+ | SH |
| THAMES CAPITAL MANAGEMENT LLC | 527K | $1M+ | SH |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 517K | $1M+ | SH |
| Point72 Asset Management, L.P. | 494K | $1M+ | SH |
| BARCLAYS PLC | 470K | $1M+ | SH |
| Artemis Investment Management LLP | 464K | $1M+ | SH |
| OPPENHEIMER & CO INC | 442K | $1M+ | SH |
| Verition Fund Management LLC | 292K | $1M+ | SH |
| POLEN CAPITAL MANAGEMENT LLC | 288K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G · Oct 30, 2025
5.2%
6.5M shares
SC 13G · Oct 17, 2025
5.8%
7.3M shares
SC 13G/A · Aug 14, 2025
0.0%
0 shares
SC 13G/A · Aug 6, 2025
2.6%
3.1M shares
SC 13G/A · May 15, 2025
6.3%
7.6M shares
Trident Capital Management VI, L.L.C. 2
SC 13D · Oct 28, 2024
6.5%
6.9M shares
SC 13G · Oct 28, 2024
7.6%
8.0M shares
SC 13D/A · Oct 25, 2024
2.4%
250.0M shares
SC 13G · Oct 25, 2024
6.7%
7.1M shares
SC 13D · Oct 25, 2024
6.8%
776.6M shares
SC 13D/A · May 12, 2023
77.1%
65.5M shares
SC 13G/A · Oct 7, 2022
0.0%
0 shares
Kensington Capital Sponsor IV LLC
SC 13D/A · Sep 23, 2022
0.0%
0 shares
SC 13D · Sep 16, 2022
77.8%
65.5M shares