Who owns Amplitude (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-Q2 13F filings (latest filed 2026-09-22). 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
49 tracked funds added or opened AMPL while 30 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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, WELLINGTON MANAGEMENT GROUP LLP, 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 conviction gap — its largest holder concentrates the name more heavily than the typical one.
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 2026-Q1 and 2026-Q2, across 194 tracked filers holding AMPL, 113 increased or opened the position and 119 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 2026-Q1 and 2026-Q2 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 6
- ROYCE & ASSOCIATES LP$8M
- Divisadero Street Capital Management, LP$765K
- Quantbot Technologies LP$751K
- Diametric Capital, LP$676K
- ALLSTATE CORP$636K
- AdvisorShares Investments LLC$553K
Full exits 11
- ACADIAN ASSET MANAGEMENT LLC$5M
- Qube Research & Technologies Ltd$4M
- FIRST TRUST ADVISORS LP$3M
- Portolan Capital Management, LLC$2M
- LIGHT STREET CAPITAL MANAGEMENT, LLC$2M
- G2 Investment Partners Management LLC$2M
Largest adds
- FMR LLC$23M
- Trigran Investments, Inc.$15M
- WELLINGTON MANAGEMENT GROUP LLP$9M
- BlackRock, Inc.$8M
- CITADEL ADVISORS LLC$6M
- CenterBook Partners LP$6M
Largest trims
- Nuveen, LLC$15M
- MILLENNIUM MANAGEMENT LLC$11M
- Point72 Asset Management, L.P.$6M
- JACOBS LEVY EQUITY MANAGEMENT, INC$4M
- BAILLIE GIFFORD & CO$4M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$4M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 11,086,006 | $85M | 14.1% | 2026-Q2 |
| BlackRock, Inc. trimmed | 10,044,780 | $77M | 12.7% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 6,083,939 | $47M | 7.7% | 2026-Q2 |
| FMR LLC added | 5,979,436 | $46M | 7.6% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 3,939,697 | $30M | 5.0% | 2026-Q2 |
| SC US (TTGP), LTD. | 2,798,951 | $21M | 3.6% | 2026-Q2 |
| STATE STREET CORP added | 2,604,696 | $20M | 3.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,477,561 | $19M | 3.1% | 2026-Q2 |
| Trigran Investments, Inc. added | 2,321,209 | $18M | 2.9% | 2026-Q2 |
| BAILLIE GIFFORD & CO trimmed | 1,779,555 | $14M | 2.3% | 2026-Q2 |
| Optimus Prime Fund Management Co., Ltd. | 1,580,100 | $12M | 2.0% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 1,508,350 | $12M | 1.9% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 1,409,424 | $11M | 1.8% | 2026-Q2 |
| MORGAN STANLEY added | 1,149,750 | $9M | 1.5% | 2026-Q2 |
| GAGNON SECURITIES LLC trimmed | 1,055,508 | $8M | 1.3% | 2026-Q2 |
| ROYCE & ASSOCIATES LP new | 1,050,976 | $8M | 1.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 1,021,647 | $8M | 1.3% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 959,626 | $7M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 924,363 | $7M | 1.2% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 896,254 | $7M | 1.1% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 872,866 | $7M | 1.1% | 2026-Q2 |
| Meros Investment Management, LP trimmed | 827,977 | $6M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 803,643 | $6M | 1.0% | 2026-Q2 |
| MONIMUS CAPITAL MANAGEMENT, LP trimmed | 783,808 | $6M | 1.0% | 2026-Q2 |
| CenterBook Partners LP added | 771,163 | $6M | 1.0% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 677,695 | $5M | 0.9% | 2026-Q2 |
| ArrowMark Colorado Holdings LLC trimmed | 656,977 | $5M | 0.8% | 2026-Q2 |
| Gagnon Advisors, LLC | 634,987 | $5M | 0.8% | 2026-Q2 |
| Cerity Partners LLC added | 473,812 | $4M | 0.6% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 416,224 | $3M | 0.5% | 2026-Q2 |
| Quantinno Capital Management LP added | 402,757 | $3M | 0.5% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 383,771 | $3M | 0.5% | 2026-Q2 |
| Toronado Partners, LLC added | 366,751 | $3M | 0.5% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 355,092 | $3M | 0.5% | 2026-Q2 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC added | 354,831 | $3M | 0.5% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 342,860 | $3M | 0.4% | 2026-Q2 |
| Man Group plc trimmed | 338,754 | $3M | 0.4% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 322,244 | $2M | 0.4% | 2026-Q2 |
| UBS Group AG added | 321,940 | $2M | 0.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 318,438 | $2M | 0.4% | 2026-Q2 |
| S SQUARED TECHNOLOGY, LLC added | 315,402 | $2M | 0.4% | 2026-Q2 |
| Madison Asset Management, LLC trimmed | 312,399 | $2M | 0.4% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 305,318 | $2M | 0.3% | 2026-Q2 |
| Numerai GP LLC added | 295,142 | $2M | 0.4% | 2026-Q2 |
| Bank of New York Mellon Corp added | 288,118 | $2M | 0.4% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 276,147 | $2M | 0.3% | 2026-Q2 |
| Nuveen, LLC trimmed | 265,301 | $2M | 0.3% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 244,236 | $2M | 0.3% | 2026-Q2 |
| Circumference Group LLC | 238,000 | $2M | 0.3% | 2026-Q2 |
| Verition Fund Management LLC trimmed | 225,873 | $2M | 0.3% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 207,194 | $2M | 0.3% | 2026-Q2 |
| WESTERLY CAPITAL MANAGEMENT, LLC trimmed | 200,000 | $2M | 0.3% | 2026-Q2 |
| Swiss National Bank added | 188,100 | $1M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 179,192 | $1M | 0.2% | 2026-Q2 |
| Corient Private Wealth LP added | 178,613 | $1M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 173,841 | $1M | 0.2% | 2026-Q2 |
| Savant Capital, LLC trimmed | 167,296 | $1M | 0.2% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 161,282 | $1M | 0.2% | 2026-Q2 |
| Invesco Ltd. added | 152,412 | $1M | 0.2% | 2026-Q2 |
| Creative Planning trimmed | 150,282 | $1M | 0.2% | 2026-Q2 |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 131,576 | $1M | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 121,013 | $905K | 0.2% | 2026-Q2 |
| Palogic Value Management, L.P. added | 120,088 | $919K | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 117,173 | $896K | 0.1% | 2026-Q2 |
| UNITED CAPITAL FINANCIAL ADVISORS, LLC added | 115,245 | $882K | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 114,460 | $876K | 0.1% | 2026-Q2 |
| Legal & General Group Plc added | 114,171 | $873K | 0.1% | 2026-Q2 |
| Utah Retirement Systems | 112,795 | $863K | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 110,332 | $844K | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 104,499 | $799K | 0.1% | 2026-Q2 |
| Divisadero Street Capital Management, LP new | 100,000 | $765K | 0.1% | 2026-Q2 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P added | 100,000 | $765K | 0.1% | 2026-Q2 |
| Quantbot Technologies LP added | 98,198 | $751K | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 93,970 | $719K | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 93,861 | $718K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 92,213 | $705K | 0.1% | 2026-Q2 |
| Inspire Investing, LLC added | 90,907 | $695K | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 90,200 | $690K | 0.1% | 2026-Q2 |
| Diametric Capital, LP added | 88,391 | $676K | 0.1% | 2026-Q2 |
| ALLSTATE CORP new | 83,194 | $636K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 80,214 | $614K | 0.1% | 2026-Q2 |
| STRS OHIO added | 75,800 | $580K | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 74,051 | $566K | 0.1% | 2026-Q2 |
| AdvisorShares Investments LLC new | 72,300 | $553K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 59,362 | $454K | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP trimmed | 59,265 | $453K | 0.1% | 2026-Q2 |
| Trexquant Investment LP trimmed | 58,389 | $447K | 0.1% | 2026-Q2 |
| Cresset Asset Management, LLC added | 56,026 | $429K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 55,818 | $427K | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 53,441 | $409K | 0.1% | 2026-Q2 |
| DARK FOREST CAPITAL MANAGEMENT LP added | 50,216 | $384K | 0.1% | 2026-Q2 |
| Penbrook Management LLC new | 48,705 | $373K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 48,565 | $372K | 0.1% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 48,364 | $444K | 0.1% | 2026-Q2 |
| Arax Advisory Partners added | 46,582 | $356K | 0.1% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC added | 44,433 | $380K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 44,396 | $340K | 0.1% | 2026-Q2 |
| Blue Trust, Inc. added | 42,008 | $321K | 0.1% | 2026-Q2 |
| Woodline Partners LP trimmed | 41,555 | $318K | 0.1% | 2026-Q2 |
| Ahara Advisors LLC new | 552 | $379K | 0.1% | 2026-Q2 |
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.