Who owns AMPY (AMPY)
Which tracked institutional funds hold AMPY, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMPY company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on AMPY is one-sided between 2025-Q4 and 2026-Q1: 39 added or opened and 6 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
AMPY’s largest tracked holder by dollar value, CDC Financial, Inc., sizes it at 13.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 13.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in AMPY divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 132 tracked filers holding AMPY, 71 increased or opened the position and 50 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in AMPY between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 14
- VANGUARD CAPITAL MANAGEMENT LLC$10M
- Caption Management, LLC$5M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$5M
- De Lisle Partners LLP$2M
- Qube Research & Technologies Ltd$1M
- VANGUARD FIDUCIARY TRUST CO$1M
Full exits 1
- VANGUARD GROUP INC$8M
Largest adds
- ACADIAN ASSET MANAGEMENT LLC$5M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$4M
- MARSHALL WACE, LLP$3M
- AMERICAN CENTURY COMPANIES INC$3M
- MILLENNIUM MANAGEMENT LLC$2M
- Truffle Hound Capital, LLC$2M
Largest trims
- Thomist Capital Management, LP$14M
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$4M
- Walleye Capital LLC$2M
- BANK OF AMERICA CORP /DE/$2M
- UBS Group AG$340K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| CDC Financial, Inc. trimmed | 2,587,347 | $16M | 9.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,633,142 | $10M | 6.0% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,632,763 | $10M | 6.0% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 1,438,807 | $9M | 5.3% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 1,377,819 | $9M | 5.0% | 2026-Q1 |
| Truffle Hound Capital, LLC | 1,250,000 | $8M | 4.6% | 2026-Q1 |
| MARSHALL WACE, LLP added | 1,243,633 | $8M | 4.6% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 894,869 | $6M | 3.3% | 2026-Q1 |
| Caption Management, LLC added | 873,591 | $5M | 3.2% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 863,815 | $5M | 3.2% | 2026-Q1 |
| CSM Advisors, LLC trimmed | 749,920 | $5M | 2.7% | 2026-Q1 |
| BlackRock, Inc. added | 576,143 | $4M | 2.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 481,130 | $3M | 1.8% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 427,481 | $3M | 1.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 415,423 | $3M | 1.5% | 2026-Q1 |
| MORGAN STANLEY added | 408,265 | $3M | 1.5% | 2026-Q1 |
| Invesco Ltd. added | 348,019 | $2M | 1.3% | 2026-Q1 |
| Inlight Wealth Management, LLC trimmed | 273,034 | $2M | 1.0% | 2026-Q1 |
| De Lisle Partners LLP new | 264,651 | $2M | 1.0% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 261,641 | $2M | 1.0% | 2026-Q1 |
| Empowered Funds, LLC added | 253,581 | $2M | 0.9% | 2026-Q1 |
| RBF Capital, LLC | 241,263 | $2M | 0.9% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 240,354 | $1M | 0.9% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 239,784 | $1M | 0.9% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 237,398 | $1M | 0.9% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 218,073 | $1M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 214,792 | $1M | 0.8% | 2026-Q1 |
| YACKTMAN ASSET MANAGEMENT LP trimmed | 210,000 | $1M | 0.8% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 202,430 | $1M | 0.7% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 194,179 | $1M | 0.7% | 2026-Q1 |
| Ancora Advisors LLC added | 190,990 | $1M | 0.7% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 179,813 | $1M | 0.7% | 2026-Q1 |
| STATE STREET CORP trimmed | 169,257 | $1M | 0.6% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 167,653 | $1M | 0.6% | 2026-Q1 |
| 683 Capital Management, LLC trimmed | 160,000 | $998K | 0.6% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 159,227 | $994K | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 142,711 | $891K | 0.5% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 134,633 | $840K | 0.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 134,323 | $838K | 0.5% | 2026-Q1 |
| Thomist Capital Management, LP trimmed | 130,842 | $816K | 0.5% | 2026-Q1 |
| OXFORD ASSET MANAGEMENT LLP new | 121,351 | $757K | 0.4% | 2026-Q1 |
| Diametric Capital, LP added | 117,291 | $732K | 0.4% | 2026-Q1 |
| SIMPLEX TRADING, LLC trimmed | 114,802 | $716K | 0.4% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 110,197 | $688K | 0.4% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 104,472 | $652K | 0.4% | 2026-Q1 |
| Ethic Inc. trimmed | 100,621 | $628K | 0.4% | 2026-Q1 |
| WINTON GROUP Ltd added | 99,948 | $624K | 0.4% | 2026-Q1 |
| NORTHERN TRUST CORP added | 94,250 | $588K | 0.3% | 2026-Q1 |
| BARCLAYS PLC added | 90,240 | $563K | 0.3% | 2026-Q1 |
| Dalton Investments, Inc. | 89,410 | $558K | 0.3% | 2026-Q1 |
| Trexquant Investment LP trimmed | 86,835 | $542K | 0.3% | 2026-Q1 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC trimmed | 85,263 | $532K | 0.3% | 2026-Q1 |
| UBS Group AG trimmed | 82,539 | $515K | 0.3% | 2026-Q1 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 78,875 | $492K | 0.3% | 2026-Q1 |
| Portolan Capital Management, LLC trimmed | 74,120 | $463K | 0.3% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 69,788 | $435K | 0.3% | 2026-Q1 |
| Engineers Gate Manager LP added | 68,478 | $427K | 0.3% | 2026-Q1 |
| Centiva Capital, LP added | 67,546 | $421K | 0.2% | 2026-Q1 |
| Dynamic Technology Lab Private Ltd added | 65,189 | $407K | 0.2% | 2026-Q1 |
| RITHOLTZ WEALTH MANAGEMENT trimmed | 65,059 | $406K | 0.2% | 2026-Q1 |
| Thrivent Financial for Lutherans new | 61,094 | $381K | 0.2% | 2026-Q1 |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 58,863 | $377K | 0.2% | 2026-Q1 |
| Hudson Bay Capital Management LP added | 59,159 | $369K | 0.2% | 2026-Q1 |
| Squarepoint Ops LLC added | 56,725 | $354K | 0.2% | 2026-Q1 |
| Catalyst Funds Management Pty Ltd added | 54,600 | $341K | 0.2% | 2026-Q1 |
| OMERS ADMINISTRATION Corp trimmed | 54,500 | $340K | 0.2% | 2026-Q1 |
| Vanguard Personalized Indexing Management, LLC trimmed | 54,156 | $338K | 0.2% | 2026-Q1 |
| Ellevest, Inc. trimmed | 44,912 | $280K | 0.2% | 2026-Q1 |
| Walleye Capital LLC trimmed | 41,308 | $258K | 0.2% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 36,778 | $236K | 0.1% | 2026-Q1 |
| Quantbot Technologies LP trimmed | 37,342 | $233K | 0.1% | 2026-Q1 |
| Lakewood Asset Management LLC added | 36,774 | $229K | 0.1% | 2026-Q1 |
| ELEMENT POINTE ADVISORS, LLC | 34,500 | $215K | 0.1% | 2026-Q1 |
| Quadrature Capital Ltd added | 33,147 | $207K | 0.1% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 32,926 | $205K | 0.1% | 2026-Q1 |
| Federation des caisses Desjardins du Quebec trimmed | 31,350 | $196K | 0.1% | 2026-Q1 |
| Brooklyn Investment Group trimmed | 28,640 | $179K | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC | 25,654 | $160K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 1,851,415 | $8M | 5.0% | 2025-Q4 stale |
| Foundry Partners, LLC added | 690,055 | $3M | 1.5% | 2025-Q1 stale |
| AQR CAPITAL MANAGEMENT LLC trimmed | 230,989 | $739K | 0.4% | 2025-Q2 stale |
| SEGALL BRYANT & HAMILL, LLC trimmed | 168,915 | $632K | 0.4% | 2025-Q1 stale |
| GWN SECURITIES INC. new | 189,143 | $564K | 0.3% | 2025-Q1 stale |
| LSV ASSET MANAGEMENT | 98,400 | $450K | 0.3% | 2025-Q4 stale |
| Virtu Financial LLC added | 82,740 | $434K | 0.3% | 2025-Q3 stale |
| FEDERATED HERMES, INC. trimmed | 115,995 | $434K | 0.3% | 2025-Q1 stale |
| Petrus Trust Company, LTA trimmed | 110,391 | $413K | 0.2% | 2025-Q1 stale |
| PANAGORA ASSET MANAGEMENT INC trimmed | 105,878 | $396K | 0.2% | 2025-Q1 stale |
| SummerHaven Investment Management, LLC added | 120,602 | $386K | 0.2% | 2025-Q2 stale |
| PRUDENTIAL FINANCIAL INC trimmed | 85,650 | $320K | 0.2% | 2025-Q1 stale |
| WOLVERINE TRADING, LLC added | 54,003 | $296K | 0.2% | 2025-Q3 stale |
| BOOTHBAY FUND MANAGEMENT, LLC added | 64,492 | $295K | 0.2% | 2025-Q4 stale |
| Nuveen, LLC new | 73,428 | $275K | 0.2% | 2025-Q1 stale |
| ARS Investment Partners, LLC | 45,000 | $270K | 0.2% | 2025-Q1 stale |
| EXCHANGE TRADED CONCEPTS, LLC trimmed | 53,030 | $242K | 0.1% | 2025-Q4 stale |
| HRT FINANCIAL LP added | 70,692 | $226K | 0.1% | 2025-Q2 stale |
| ALLIANCEBERNSTEIN L.P. | 51,810 | $194K | 0.1% | 2025-Q1 stale |
| Aster Capital Management (DIFC) Ltd new | 54,889 | $176K | 0.1% | 2025-Q2 stale |
| Verition Fund Management LLC added | 54,800 | $175K | 0.1% | 2025-Q2 stale |
| Jain Global LLC new | 48,500 | $155K | 0.1% | 2025-Q2 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.