Who owns AMPL (AMPL)
Which tracked institutional funds hold AMPL, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMPL 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 AMPL is one-sided between 2025-Q4 and 2026-Q1: 20 added or opened and 87 trimmed or exited — on balance reducing.
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
AMPL’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes AMPL more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in AMPL 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 216 tracked filers holding AMPL, 111 increased or opened the position and 114 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 AMPL 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 8
- VANGUARD PORTFOLIO MANAGEMENT LLC$42M
- VANGUARD CAPITAL MANAGEMENT LLC$28M
- VANGUARD FIDUCIARY TRUST CO$5M
- Qube Research & Technologies Ltd$4M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$4M
- Y-Intercept (Hong Kong) Ltd$3M
Full exits 17
- VANGUARD GROUP INC$117M
- TWO SIGMA ADVISERS, LP$6M
- VOLORIDGE INVESTMENT MANAGEMENT, LLC$5M
- MARSHALL WACE, LLP$3M
- Engineers Gate Manager LP$2M
- ExodusPoint Capital Management, LP$2M
Largest adds
- WELLINGTON MANAGEMENT GROUP LLP$53M
- FMR LLC$17M
- JACOBS LEVY EQUITY MANAGEMENT, INC$11M
- MONIMUS CAPITAL MANAGEMENT, LP$4M
- DIMENSIONAL FUND ADVISORS LP$3M
- Quantinno Capital Management LP$2M
Largest trims
- ALLIANCEBERNSTEIN L.P.$69M
- BlackRock, Inc.$44M
- TimesSquare Capital Management, LLC$29M
- Point72 Asset Management, L.P.$24M
- CITADEL ADVISORS LLC$16M
- LIGHT STREET CAPITAL MANAGEMENT, LLC$15M
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 |
|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP added | 11,154,556 | $76M | 9.0% | 2026-Q1 |
| BlackRock, Inc. added | 10,162,138 | $69M | 8.2% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 6,165,091 | $42M | 5.0% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 4,091,320 | $28M | 3.3% | 2026-Q1 |
| FMR LLC added | 3,279,127 | $22M | 2.7% | 2026-Q1 |
| SC US (TTGP), LTD. | 2,798,951 | $19M | 2.3% | 2026-Q1 |
| BAILLIE GIFFORD & CO trimmed | 2,634,150 | $18M | 2.1% | 2026-Q1 |
| Nuveen, LLC trimmed | 2,554,774 | $17M | 2.1% | 2026-Q1 |
| STATE STREET CORP added | 2,429,307 | $17M | 2.0% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 2,411,300 | $16M | 2.0% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,326,107 | $16M | 1.9% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 2,031,823 | $14M | 1.6% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 1,731,437 | $12M | 1.4% | 2026-Q1 |
| Optimus Prime Fund Management Co., Ltd. | 1,580,100 | $11M | 1.3% | 2026-Q1 |
| MONIMUS CAPITAL MANAGEMENT, LP added | 1,264,286 | $9M | 1.0% | 2026-Q1 |
| ArrowMark Colorado Holdings LLC trimmed | 1,256,023 | $9M | 1.0% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 1,204,179 | $8M | 1.0% | 2026-Q1 |
| Meros Investment Management, LP added | 1,163,826 | $8M | 0.9% | 2026-Q1 |
| GAGNON SECURITIES LLC added | 1,059,836 | $7M | 0.9% | 2026-Q1 |
| MORGAN STANLEY added | 920,506 | $6M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP added | 868,529 | $6M | 0.7% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 800,030 | $5M | 0.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 733,701 | $5M | 0.6% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 712,395 | $5M | 0.6% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 691,661 | $5M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 660,804 | $5M | 0.5% | 2026-Q1 |
| Gagnon Advisors, LLC added | 634,987 | $4M | 0.5% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 617,713 | $4M | 0.5% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 598,270 | $4M | 0.5% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 597,441 | $4M | 0.5% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 576,301 | $4M | 0.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 556,052 | $4M | 0.5% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 317,618 | $4M | 0.4% | 2026-Q1 |
| WESTERLY CAPITAL MANAGEMENT, LLC | 500,000 | $3M | 0.4% | 2026-Q1 |
| Man Group plc added | 478,338 | $3M | 0.4% | 2026-Q1 |
| Cerity Partners LLC trimmed | 462,790 | $3M | 0.4% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 454,143 | $3M | 0.4% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 424,566 | $3M | 0.3% | 2026-Q1 |
| Trigran Investments, Inc. new | 380,526 | $3M | 0.3% | 2026-Q1 |
| Quantinno Capital Management LP added | 370,515 | $3M | 0.3% | 2026-Q1 |
| Portolan Capital Management, LLC trimmed | 359,593 | $2M | 0.3% | 2026-Q1 |
| MERCER GLOBAL ADVISORS INC /ADV added | 329,425 | $2M | 0.3% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 328,940 | $2M | 0.3% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 321,657 | $2M | 0.3% | 2026-Q1 |
| Toronado Partners, LLC trimmed | 318,823 | $2M | 0.3% | 2026-Q1 |
| Madison Asset Management, LLC added | 314,060 | $2M | 0.3% | 2026-Q1 |
| LIGHT STREET CAPITAL MANAGEMENT, LLC trimmed | 292,844 | $2M | 0.2% | 2026-Q1 |
| G2 Investment Partners Management LLC trimmed | 270,000 | $2M | 0.2% | 2026-Q1 |
| Verition Fund Management LLC added | 268,119 | $2M | 0.2% | 2026-Q1 |
| Trexquant Investment LP trimmed | 266,143 | $2M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 262,530 | $2M | 0.2% | 2026-Q1 |
| Circumference Group LLC | 238,000 | $2M | 0.2% | 2026-Q1 |
| Swiss National Bank | 181,200 | $1M | 0.1% | 2026-Q1 |
| Creative Planning added | 180,002 | $1M | 0.1% | 2026-Q1 |
| MARATHON CAPITAL MANAGEMENT added | 171,560 | $1M | 0.1% | 2026-Q1 |
| Savant Capital, LLC trimmed | 167,561 | $1M | 0.1% | 2026-Q1 |
| IEQ CAPITAL, LLC added | 164,576 | $1M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 163,946 | $1M | 0.1% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 159,275 | $1M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 161,360 | $1M | 0.1% | 2026-Q1 |
| ALGERT GLOBAL LLC trimmed | 157,820 | $1M | 0.1% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 154,389 | $1M | 0.1% | 2026-Q1 |
| S SQUARED TECHNOLOGY, LLC new | 150,402 | $1M | 0.1% | 2026-Q1 |
| Invesco Ltd. added | 135,201 | $922K | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 131,640 | $898K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 123,694 | $844K | 0.1% | 2026-Q1 |
| UBS Group AG trimmed | 122,024 | $832K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 120,038 | $819K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 10,070,878 | $117M | 13.9% | 2025-Q4 stale |
| BATTERY MANAGEMENT CORP. trimmed | 4,451,304 | $45M | 5.4% | 2025-Q1 stale |
| Sunriver Management LLC trimmed | 3,339,327 | $41M | 4.9% | 2025-Q2 stale |
| INSTITUTIONAL VENTURE MANAGEMENT XV, LLC | 1,895,531 | $24M | 2.8% | 2025-Q2 stale |
| TWO SIGMA ADVISERS, LP added | 560,500 | $6M | 0.8% | 2025-Q4 stale |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC added | 491,000 | $5M | 0.6% | 2025-Q3 stale |
| TUDOR INVESTMENT CORP ET AL added | 414,830 | $5M | 0.6% | 2025-Q2 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 402,828 | $5M | 0.6% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC added | 426,996 | $5M | 0.5% | 2025-Q3 stale |
| NEUBERGER BERMAN GROUP LLC new | 426,582 | $5M | 0.5% | 2025-Q3 stale |
| LORD, ABBETT & CO. LLC trimmed | 385,286 | $4M | 0.5% | 2025-Q3 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. new | 275,000 | $3M | 0.4% | 2025-Q2 stale |
| MARSHALL WACE, LLP trimmed | 255,399 | $3M | 0.4% | 2025-Q4 stale |
| PATHWAY CAPITAL MANAGEMENT, LP added | 216,386 | $3M | 0.3% | 2025-Q2 stale |
| ARDSLEY ADVISORY PARTNERS LP added | 210,000 | $3M | 0.3% | 2025-Q2 stale |
| Engineers Gate Manager LP added | 187,925 | $2M | 0.3% | 2025-Q4 stale |
| ExodusPoint Capital Management, LP added | 171,876 | $2M | 0.2% | 2025-Q4 stale |
| Informed Momentum Co LLC new | 188,463 | $2M | 0.2% | 2025-Q1 stale |
| TD Asset Management Inc trimmed | 173,606 | $2M | 0.2% | 2025-Q3 stale |
| AMERIPRISE FINANCIAL INC added | 130,110 | $2M | 0.2% | 2025-Q4 stale |
| Kodai Capital Management LP new | 138,316 | $1M | 0.2% | 2025-Q1 stale |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 128,286 | $1M | 0.2% | 2025-Q3 stale |
| BANK OF MONTREAL /CAN/ added | 108,989 | $1M | 0.2% | 2025-Q2 stale |
| Baker Avenue Asset Management, LP added | 106,819 | $1M | 0.1% | 2025-Q4 stale |
| Kultura Capital Management LP new | 105,600 | $1M | 0.1% | 2025-Q4 stale |
| HarbourVest Partners LLC trimmed | 114,231 | $1M | 0.1% | 2025-Q1 stale |
| Vishria Bird Financial Group, LLC trimmed | 108,430 | $1M | 0.1% | 2025-Q3 stale |
| MACKENZIE FINANCIAL CORP new | 86,730 | $1M | 0.1% | 2025-Q4 stale |
| RAYMOND JAMES FINANCIAL INC trimmed | 83,916 | $972K | 0.1% | 2025-Q4 stale |
| Quantbot Technologies LP trimmed | 87,881 | $942K | 0.1% | 2025-Q3 stale |
| Thrive Capital Management, LLC | 85,640 | $873K | 0.1% | 2025-Q1 stale |
| Kera Capital Partners, Inc. trimmed | 83,250 | $848K | 0.1% | 2025-Q1 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.