AMPRIUS TECHNOLOGIES INC (AMPX) Top Institutional Shareholders
AMPRIUS TECHNOLOGIES INC (AMPX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $1.33B in AMPX holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of AMPX tracked by InsiderSet, reporting ownership valued at approximately $155.54M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $138.38M, representing an estimated loss of -11.03% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed AMPX value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, Jane Street Group, Llc, and several other long-term asset managers with concentrated positions in AMPRIUS TECHNOLOGIES INC (AMPX).
This page ranks the largest institutional AMPX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
241
Total Reported Value
$1.33B
Largest Holder
Blackrock, Inc.
Largest Position
$155.54M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
149
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 9,225,611 | $155,543,800 | $138,384,165 | -$17,159,635 | -11.03% | |
| Vanguard Capital Management Llc | 0.00% | 4,908,875 | $82,763,633 | $73,633,125 | -$9,130,508 | -11.03% | |
| Jane Street Group, Llc | 0.08% | 4,160,656 | $70,148,660 | $62,409,840 | -$7,738,820 | -11.03% | |
| Driehaus Capital Management Llc | 0.47% | 3,794,178 | $63,969,841 | $56,912,670 | -$7,057,171 | -11.03% | |
| Two Sigma Investments, Lp | 0.05% | 3,506,075 | $59,112,425 | $52,591,125 | -$6,521,300 | -11.03% | |
| Morgan Stanley | 0.00% | 3,162,167 | $53,314,136 | $47,432,505 | -$5,881,631 | -11.03% | |
| Geode Capital Management, Llc | 0.00% | 2,814,530 | $47,463,273 | $42,217,950 | -$5,245,323 | -11.05% | |
| State Street Corp | 0.00% | 2,712,630 | $45,734,942 | $40,689,450 | -$5,045,492 | -11.03% | |
| Ubs Group Ag | 0.01% | 2,311,554 | $38,972,800 | $34,673,310 | -$4,299,490 | -11.03% | |
| Goldman Sachs Group Inc | 0.00% | 2,226,181 | $37,533,412 | $33,392,715 | -$4,140,697 | -11.03% | |
| Massachusetts Financial Services Co | 0.01% | 2,024,760 | $34,137,454 | $30,371,400 | -$3,766,054 | -11.03% | |
| Baird Financial Group, Inc. | 0.04% | 1,585,098 | $26,724,752 | $23,776,470 | -$2,948,282 | -11.03% | |
| Citadel Advisors Llc | 0.02% | 1,438,660 | $24,255,808 | $21,579,900 | -$2,675,908 | -11.03% | |
| Marshall Wace, Llp | 0.02% | 1,227,599 | $20,697,318 | $18,413,985 | -$2,283,333 | -11.03% | |
| Qube Research & Technologies Ltd | 0.03% | 1,227,570 | $20,696,830 | $18,413,550 | -$2,283,280 | -11.03% | |
| William Blair Investment Management, Llc | 0.07% | 1,170,131 | $19,728,409 | $17,551,965 | -$2,176,444 | -11.03% | |
| D. E. Shaw & Co., Inc. | 0.01% | 1,075,386 | $18,131,008 | $16,130,790 | -$2,000,218 | -11.03% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,073,396 | $18,097,457 | $16,100,940 | -$1,996,517 | -11.03% | |
| Barclays Plc | 0.01% | 1,054,927 | $17,786,068 | $15,823,905 | -$1,962,163 | -11.03% | |
| Charles Schwab Investment Management Inc | 0.00% | 1,039,394 | $17,524,183 | $15,590,910 | -$1,933,273 | -11.03% | |
| Millennium Management Llc | 0.01% | 1,035,238 | $17,454,113 | $15,528,570 | -$1,925,543 | -11.03% | |
| Northern Trust Corp | 0.00% | 1,022,625 | $17,241,457 | $15,339,375 | -$1,902,082 | -11.03% | |
| Hood River Capital Management Llc | 0.16% | 949,147 | $16,002,618 | $14,237,205 | -$1,765,413 | -11.03% | |
| Stephens Investment Management Group Llc | 0.21% | 893,108 | $15,057,801 | $13,396,620 | -$1,661,181 | -11.03% | |
| Deutsche Bank Ag\ | 0.00% | 875,031 | $14,753,022 | $13,125,465 | -$1,627,557 | -11.03% | |
| Vanguard Fiduciary Trust Co | 0.00% | 872,582 | $14,711,733 | $13,088,730 | -$1,623,003 | -11.03% | |
| Wolf Hill Capital Management, Lp | 1.92% | 802,925 | $13,537,316 | $12,043,875 | -$1,493,441 | -11.03% | |
| Myda Advisors Llc | 2.93% | 735,000 | $12,392,100 | $11,025,000 | -$1,367,100 | -11.03% | |
| Stifel Financial Corp | 0.01% | 733,172 | $12,361,281 | $10,997,580 | -$1,363,701 | -11.03% | |
| Trexquant Investment Lp | 0.09% | 716,257 | $12,076,093 | $10,743,855 | -$1,332,238 | -11.03% | |
| Science & Technology Partners, L.P. | 2.80% | 635,106 | $10,707,888 | $9,526,590 | -$1,181,298 | -11.03% | |
| Oberweis Asset Management Inc/ | 0.29% | 585,000 | $9,863,100 | $8,775,000 | -$1,088,100 | -11.03% | |
| Sei Investments Co | 0.01% | 579,161 | $9,764,652 | $8,687,415 | -$1,077,237 | -11.03% | |
| Russell Investments Group, Ltd. | 0.01% | 543,463 | $9,162,794 | $8,151,945 | -$1,010,849 | -11.03% | |
| Voloridge Investment Management, Llc | 0.04% | 531,998 | $8,969,486 | $7,979,970 | -$989,516 | -11.03% | |
| Thames Capital Management Llc | 1.59% | 526,832 | $8,882,388 | $7,902,480 | -$979,908 | -11.03% | |
| Invesco Ltd. | 0.00% | 498,804 | $8,409,835 | $7,482,060 | -$927,775 | -11.03% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.01% | 489,652 | $8,255,533 | $7,344,780 | -$910,753 | -11.03% | |
| Essex Investment Management Co Llc | 1.19% | 445,441 | $7,510,135 | $6,681,615 | -$828,520 | -11.03% | |
| Polen Capital Management | David M. Polen | 0.05% | 422,145 | $7,117,365 | $6,332,175 | -$785,190 | -11.03% |
| Tudor Investment Corp Et Al | 0.04% | 419,661 | $7,075,484 | $6,294,915 | -$780,569 | -11.03% | |
| Oppenheimer & Co Inc | 0.08% | 412,509 | $6,954,902 | $6,187,635 | -$767,267 | -11.03% | |
| Allspring Global Investments Holdings, Llc | 0.01% | 431,398 | $6,695,297 | $6,470,970 | -$224,327 | -3.35% | |
| First Trust Advisors Lp | 0.00% | 394,569 | $6,652,433 | $5,918,535 | -$733,898 | -11.03% | |
| Palisades Investment Partners, Llc | 2.44% | 369,476 | $6,229,365 | $5,542,140 | -$687,225 | -11.03% | |
| Calamos Advisors Llc | 0.02% | 364,506 | $6,145,572 | $5,467,590 | -$677,982 | -11.03% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 359,525 | $6,061,592 | $5,392,875 | -$668,717 | -11.03% |
| Lisanti Capital Growth, Llc | 1.50% | 352,375 | $5,941,043 | $5,285,625 | -$655,418 | -11.03% | |
| Public Sector Pension Investment Board | 0.02% | 332,000 | $5,597,520 | $4,980,000 | -$617,520 | -11.03% | |
| Silvercrest Asset Management Group Llc | 0.04% | 319,879 | $5,393,160 | $4,798,185 | -$594,975 | -11.03% |
Frequently asked questions about AMPX
Who owns the most AMPX stock?
The largest holders of AMPX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for AMPRIUS TECHNOLOGIES INC (AMPX).
Is AMPX widely held by superinvestors?
Many widely followed stocks like AMPX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly AMPX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.