Who owns ATHM (ATHM)
Which tracked institutional funds hold ATHM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ATHM 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
28 tracked funds added or opened ATHM while 65 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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
ATHM’s largest tracked holder by dollar value, FIL Ltd, sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ATHM 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 146 tracked filers holding ATHM, 74 increased or opened the position and 107 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 ATHM 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 16
- VANGUARD CAPITAL MANAGEMENT LLC$34M
- Qube Research & Technologies Ltd$10M
- VANGUARD FIDUCIARY TRUST CO$9M
- FIRST TRUST ADVISORS LP$6M
- E Fund Management Co., Ltd.$5M
- HRT FINANCIAL LP$3M
Full exits 15
- VANGUARD GROUP INC$43M
- Robeco Institutional Asset Management B.V.$34M
- HSBC HOLDINGS PLC$5M
- Sumitomo Mitsui Trust Group, Inc.$3M
- Swiss National Bank$2M
- CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM$2M
Largest adds
- North of South Capital LLP$14M
- SCHRODER INVESTMENT MANAGEMENT GROUP$11M
- Long Corridor Asset Management Ltd$9M
- D. E. Shaw & Co., Inc.$9M
- JANE STREET GROUP, LLC$7M
- CITADEL ADVISORS LLC$6M
Largest trims
- Invesco Ltd.$73M
- ACADIAN ASSET MANAGEMENT LLC$25M
- BlackRock, Inc.$24M
- FIL Ltd$23M
- Krane Funds Advisors LLC$21M
- STATE STREET CORP$17M
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 |
|---|---|---|---|---|
| FIL Ltd trimmed | 4,187,221 | $73M | 7.3% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 4,170,658 | $72M | 7.3% | 2026-Q1 |
| Invesco Ltd. trimmed | 4,069,995 | $71M | 7.1% | 2026-Q1 |
| North of South Capital LLP added | 3,700,631 | $64M | 6.4% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 3,652,835 | $63M | 6.4% | 2026-Q1 |
| M&G PLC added | 3,473,398 | $59M | 5.9% | 2026-Q1 |
| BlackRock, Inc. trimmed | 3,312,654 | $58M | 5.8% | 2026-Q1 |
| Krane Funds Advisors LLC trimmed | 2,765,600 | $48M | 4.8% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 2,232,118 | $39M | 3.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,943,610 | $34M | 3.4% | 2026-Q1 |
| Polunin Capital Partners Ltd trimmed | 1,142,966 | $20M | 2.0% | 2026-Q1 |
| STATE STREET CORP trimmed | 793,460 | $14M | 1.4% | 2026-Q1 |
| NORGES BANK trimmed | 469,961 | $13M | 1.3% | 2026-Q1 |
| Long Corridor Asset Management Ltd added | 718,038 | $12M | 1.3% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 605,212 | $11M | 1.1% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 576,935 | $10M | 1.0% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 516,899 | $9M | 0.9% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 510,482 | $9M | 0.9% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 452,496 | $8M | 0.8% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 438,773 | $8M | 0.8% | 2026-Q1 |
| Aberdeen Group plc trimmed | 407,575 | $7M | 0.7% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 409,949 | $7M | 0.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 370,108 | $6M | 0.6% | 2026-Q1 |
| UBS Group AG trimmed | 368,054 | $6M | 0.6% | 2026-Q1 |
| Oasis Management Co Ltd. | 367,978 | $6M | 0.6% | 2026-Q1 |
| MORGAN STANLEY trimmed | 365,821 | $6M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 364,818 | $6M | 0.6% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 330,066 | $6M | 0.6% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 328,977 | $6M | 0.6% | 2026-Q1 |
| ABN AMRO INVESTMENT SOLUTIONS added | 308,171 | $5M | 0.5% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 292,564 | $5M | 0.5% | 2026-Q1 |
| E Fund Management Co., Ltd. trimmed | 270,314 | $5M | 0.5% | 2026-Q1 |
| Legal & General Group Plc trimmed | 259,748 | $5M | 0.5% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO trimmed | 249,214 | $4M | 0.4% | 2026-Q1 |
| HRT FINANCIAL LP added | 181,579 | $3M | 0.3% | 2026-Q1 |
| STOREBRAND ASSET MANAGEMENT AS | 161,895 | $3M | 0.3% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC added | 156,857 | $3M | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 154,306 | $3M | 0.3% | 2026-Q1 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 148,084 | $3M | 0.3% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 139,200 | $2M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 138,804 | $2M | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 126,144 | $2M | 0.2% | 2026-Q1 |
| Verdad Advisers, LP new | 121,317 | $2M | 0.2% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 116,686 | $2M | 0.2% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 115,550 | $2M | 0.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 114,485 | $2M | 0.2% | 2026-Q1 |
| Squarepoint Ops LLC added | 109,361 | $2M | 0.2% | 2026-Q1 |
| KBC Group NV added | 97,550 | $2M | 0.2% | 2026-Q1 |
| XTX Topco Ltd added | 95,540 | $2M | 0.2% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 94,900 | $2M | 0.2% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP trimmed | 89,798 | $2M | 0.2% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 82,354 | $1M | 0.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 82,123 | $1M | 0.1% | 2026-Q1 |
| CANADA LIFE ASSURANCE Co trimmed | 79,172 | $1M | 0.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 77,267 | $1M | 0.1% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 73,603 | $1M | 0.1% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 72,460 | $1M | 0.1% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 71,696 | $1M | 0.1% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC trimmed | 70,851 | $1M | 0.1% | 2026-Q1 |
| Amundi trimmed | 70,079 | $1M | 0.1% | 2026-Q1 |
| ROYAL LONDON ASSET MANAGEMENT LTD trimmed | 68,500 | $1M | 0.1% | 2026-Q1 |
| SG Americas Securities, LLC added | 61,715 | $1M | 0.1% | 2026-Q1 |
| Assenagon Asset Management S.A. trimmed | 58,351 | $1M | 0.1% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 56,756 | $986K | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 56,412 | $980K | 0.1% | 2026-Q1 |
| BlueCrest Capital Management Ltd added | 55,500 | $964K | 0.1% | 2026-Q1 |
| Marex Group plc | 50,000 | $868K | 0.1% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 48,039 | $834K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 47,894 | $832K | 0.1% | 2026-Q1 |
| CITIGROUP INC trimmed | 45,733 | $794K | 0.1% | 2026-Q1 |
| AIA Group Ltd trimmed | 44,743 | $777K | 0.1% | 2026-Q1 |
| KLP KAPITALFORVALTNING AS added | 44,300 | $769K | 0.1% | 2026-Q1 |
| US BANCORP \DE\ trimmed | 44,210 | $768K | 0.1% | 2026-Q1 |
| Oldfield Partners LLP added | 41,400 | $719K | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 41,287 | $717K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 1,913,499 | $43M | 4.3% | 2025-Q4 stale |
| Robeco Institutional Asset Management B.V. trimmed | 1,510,651 | $34M | 3.4% | 2025-Q4 stale |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC trimmed | 562,924 | $16M | 1.6% | 2025-Q1 stale |
| KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC trimmed | 422,500 | $12M | 1.2% | 2025-Q1 stale |
| LAZARD ASSET MANAGEMENT LLC trimmed | 309,000 | $9M | 0.9% | 2025-Q1 stale |
| Alberta Investment Management Corp | 254,139 | $7M | 0.7% | 2025-Q1 stale |
| HSBC HOLDINGS PLC trimmed | 224,484 | $5M | 0.5% | 2025-Q4 stale |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 170,187 | $4M | 0.4% | 2025-Q2 stale |
| Sumitomo Mitsui Trust Group, Inc. | 153,169 | $3M | 0.3% | 2025-Q4 stale |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 116,200 | $3M | 0.3% | 2025-Q2 stale |
| PINEBRIDGE INVESTMENTS, L.P. added | 104,418 | $3M | 0.3% | 2025-Q1 stale |
| Bridgewater Associates, LP added | 88,490 | $2M | 0.2% | 2025-Q1 stale |
| Rakuten Investment Management, Inc. added | 13,694 | $2M | 0.2% | 2025-Q3 stale |
| Swiss National Bank trimmed | 92,089 | $2M | 0.2% | 2025-Q4 stale |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 91,180 | $2M | 0.2% | 2025-Q4 stale |
| Mitsubishi UFJ Asset Management Co., Ltd. | 84,645 | $2M | 0.2% | 2025-Q4 stale |
| Kepler Cheuvreux (Suisse) SA added | 76,381 | $2M | 0.2% | 2025-Q4 stale |
| GF FUND MANAGEMENT CO. LTD. trimmed | 55,992 | $2M | 0.2% | 2025-Q3 stale |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN | 54,000 | $1M | 0.1% | 2025-Q2 stale |
| Grantham, Mayo, Van Otterloo & Co. LLC trimmed | 46,369 | $1M | 0.1% | 2025-Q2 stale |
| Woodline Partners LP new | 38,221 | $1M | 0.1% | 2025-Q3 stale |
| CANADA PENSION PLAN INVESTMENT BOARD added | 42,100 | $1M | 0.1% | 2025-Q2 stale |
| Capitolis Liquid Global Markets LLC new | 38,500 | $1M | 0.1% | 2025-Q1 stale |
| AVIVA PLC trimmed | 45,518 | $1M | 0.1% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 37,036 | $824K | 0.1% | 2025-Q4 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.