Amprius Technologies
AMPX
9.33
-0.14
-1.48%
Amprius Technologies
US · AMPX
#3048 by market cap
Listed 1970
9.33
-0.14
-1.48%
Live - 5344 symbols - heartbeat 448s ago
· 2026-10-08 08:30
Pre-market
9.06
-2.89%
After-hours
9.33
0.00%
Overnight
9.15
-1.93%
- Market cap
- 1.36B
- P/E (TTM)i
- -32.17
- P/Bi
- 10.85
- EPSi
- -0.35
- Div yieldi
- 0.00%
- 52W posi
- 10%
Reader sentiment
Are you bullish or bearish on AMPX?
Anonymous reader poll. Unscientific, not investment advice.
✦ Quant Ownership Signal how this is computed
Distributing
- The number of reporting institutions decreased by 2 in the most recent period (2026/Q3).
- Total institutional ownership fell 3.7 percentage points.
Institutional ownership
- Held by institutions
- 74.30% -3.66pp
- Institutions
- 312 -2
- As of
- 2026/Q3 vs. prior period
Ownership vs. money flow
AlignedInstitutions trimmed shares last reporting period, and the stock has seen net outflows in main-fund flow over the last 20 trading sessions - the two line up.
Institutional ownership changes are reported quarterly with a lag; fund-flow data is daily. Treat this as a directional cross-check, not a precise timing signal.
Holder types
Mutual Fund40.71%
Hedge Fund12.38%
VC/PE Fund7.08%
Public Company6.48%
Private Company6.19%
Individual/Insider2.19%
Government Pension Fund1.31%
Other23.56%
Top holders as of 2026-06-30
BlackRock
7.76% · 11.34M sh
Vanguard Capital Management, LLC
4.49% · 6.55M sh
Morgan Stanley
3.45% · 5.05M sh
Two Sigma Investments, LP
2.96% · 4.32M sh
UBS Asset Management
2.94% · 4.29M sh
Kleiner Perkins Caufield & Byers LLC
2.70% · 3.95M sh
Geode Capital Management, LLC
2.41% · 3.52M sh
Trident Capital, Inc.
2.33% · 3.41M sh
Jane Street Group, LLC
2.33% · 3.40M sh
State Street Global Advisors
2.22% · 3.24M sh
Bar length is relative to the largest holder shown here, not to 100% of the company.
Insiders
50 filings tracked · 12 buys · 38 sells
| Name | Role | Stake |
|---|---|---|
| Jonathan Bornstein | President of Amprius Lab | 0.73% |
| Donald Dixon | Independent Chairperson | 0.54% |
| Kang Sun | Chief Executive Officer | 0.25% |
| Constantin Stefan | Chief Technology Officer | 0.17% |
| Kathleen Bayless | Independent Director | 0.14% |
| Sandra Wallach | Chief Financial Officer | 0.14% |
| Livingston Satterthwaite | Member of Industry Advisory Council | 0.10% |
| Steven Chu | Independent Director | 0.09% |
| Thomas Stepien | President | 0.03% |
| Justin Mirro | Independent Director | -- |
Insider transactions most recent Form 4 filings
| Date | Name | Role | Type | Shares | Price |
|---|---|---|---|---|---|
| 2026-08-24 | Thomas Stepien | President | Other Acquisition | +346 | -- |
| 2026-08-24 | Thomas Stepien | President | Other Disposition | -15,346 | -- |
| 2026-08-23 | Thomas Stepien | President | Open Market Disposition | -31,529 | $10.03–10.34 |
| 2026-08-23 | Thomas Stepien | President | Intent to Sell (Form 144) | -8,000 | $10.03 |
| 2026-08-20 | Kang Sun | Chief Executive Officer | Open Market Disposition | -62,101 | $10.34 |
| 2026-08-20 | Constantin Stefan | Chief Technology Officer | Open Market Disposition | -29,681 | $10.34 |
| 2026-06-14 | Donald Dixon | Independent Chairperson | Open Market Disposition | -85,000 | $17.17 |
| 2026-06-11 | Donald Dixon | Independent Chairperson | Other Acquisition | +10,423 | -- |
| 2026-06-11 | Kathleen Bayless | Independent Director | Other Acquisition | +10,423 | -- |
| 2026-06-11 | Livingston Satterthwaite | Member of Industry Advisory Council | Other Acquisition | +10,423 | -- |
| 2026-06-11 | Steven Chu | Independent Director | Other Acquisition | +10,423 | -- |
| 2026-06-08 | Donald Dixon | Independent Chairperson | Open Market Disposition | -40,000 | $19.13 |
| 2026-06-07 | Donald Dixon | Independent Chairperson | Intent to Sell (Form 144) | -125,000 | $18.85 |
| 2026-06-03 | Thomas Stepien | President | Other Acquisition | +36,914 | -- |
| 2026-06-03 | Thomas Stepien | President | Other Disposition | -67,298 | -- |
| 2026-06-03 | Thomas Stepien | President | Open Market Disposition | -2,000 | $20.97 |
| 2026-05-26 | Kang Sun | Chief Executive Officer | Open Market Disposition | -356 | $17.19 |
| 2026-05-26 | Thomas Stepien | President | Open Market Disposition | -4,375 | $17.19 |
| 2026-05-26 | Constantin Stefan | Chief Technology Officer | Open Market Disposition | -3,208 | $17.19 |
| 2026-05-25 | Donald Dixon | Independent Chairperson | Open Market Disposition | -17,895 | $17.90 |
Form 4 filings, most recent per company. "Other Derivative Acquisition" rows are mostly RSU/option vesting, not open-market buying - the Type column says which.
Quote time 2026-10-08 08:30:31 · For reference only, not investment advice and not tailored to your situation.