Who owns AMBP
Which tracked institutional funds hold AMBP, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMBP 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
48 tracked funds added or opened AMBP while 18 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
AMBP’s largest tracked holder by dollar value, Arini Capital Management Ltd, sizes it at 10.2% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 10.2pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in AMBP 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 221 tracked filers holding AMBP, 123 increased or opened the position and 99 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 AMBP 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 3
- CastleKnight Management LP$2M
- Walleye Capital LLC$1M
- TD Waterhouse Canada Inc.$505K
Full exits 6
- Weiss Asset Management LP$18M
- Monarch Alternative Capital LP$12M
- HRT FINANCIAL LP$3M
- JANE STREET GROUP, LLC$3M
- Janney Montgomery Scott LLC$2M
- Corvex Management LP$1M
Largest adds
- Arini Capital Management Ltd$54M
- GOLDMAN SACHS GROUP INC$12M
- FEDERATED HERMES, INC.$10M
- BlackRock, Inc.$8M
- Diameter Capital Partners LP$6M
- DIMENSIONAL FUND ADVISORS LP$6M
Largest trims
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$7M
- Mountaineer Partners Management, LLC$5M
- RENAISSANCE TECHNOLOGIES LLC$2M
- TUDOR INVESTMENT CORP ET AL$794K
- KESTRA PRIVATE WEALTH SERVICES, LLC$769K
- MACKENZIE FINANCIAL CORP$632K
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 |
|---|---|---|---|---|
| Arini Capital Management Ltd added | 20,899,209 | $99M | 17.0% | 2026-Q2 |
| CANYON CAPITAL ADVISORS LLC trimmed | 10,385,711 | $49M | 8.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 8,672,256 | $41M | 7.0% | 2026-Q2 |
| BlackRock, Inc. added | 8,277,816 | $39M | 6.7% | 2026-Q2 |
| PLATINUM EQUITY, LLC | 5,311,164 | $25M | 4.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 5,137,686 | $24M | 4.2% | 2026-Q2 |
| Diameter Capital Partners LP added | 5,030,465 | $24M | 4.1% | 2026-Q2 |
| PRIVATE MANAGEMENT GROUP INC trimmed | 4,964,912 | $24M | 4.0% | 2026-Q2 |
| Empyrean Capital Partners, LP | 4,000,000 | $19M | 3.2% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 3,217,228 | $15M | 2.6% | 2026-Q2 |
| STATE STREET CORP added | 2,614,927 | $12M | 2.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,121,665 | $10M | 1.7% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 2,110,733 | $10M | 1.7% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 2,076,732 | $10M | 1.7% | 2026-Q2 |
| Gilman Hill Asset Management, LLC added | 2,036,475 | $10M | 1.7% | 2026-Q2 |
| MORGAN STANLEY added | 1,883,247 | $9M | 1.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,864,760 | $9M | 1.5% | 2026-Q2 |
| Nuveen, LLC trimmed | 1,693,738 | $8M | 1.4% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 1,589,955 | $8M | 1.3% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL added | 1,450,228 | $7M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,393,819 | $7M | 1.1% | 2026-Q2 |
| UBS Group AG trimmed | 1,374,718 | $7M | 1.1% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 1,230,286 | $6M | 1.0% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 1,212,178 | $6M | 1.0% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 1,157,299 | $5M | 0.9% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 1,122,990 | $5M | 0.9% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 1,121,703 | $5M | 0.9% | 2026-Q2 |
| GABELLI FUNDS LLC added | 1,034,848 | $5M | 0.8% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 925,571 | $4M | 0.8% | 2026-Q2 |
| Hillsdale Investment Management Inc. trimmed | 864,163 | $4M | 0.7% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 768,044 | $4M | 0.6% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 596,870 | $3M | 0.5% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP trimmed | 584,275 | $3M | 0.5% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 574,627 | $3M | 0.5% | 2026-Q2 |
| Mountaineer Partners Management, LLC trimmed | 574,207 | $3M | 0.5% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P trimmed | 528,639 | $3M | 0.4% | 2026-Q2 |
| Bank of New York Mellon Corp added | 528,531 | $3M | 0.4% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 464,206 | $2M | 0.4% | 2026-Q2 |
| CWA Asset Management Group, LLC trimmed | 463,299 | $2M | 0.4% | 2026-Q2 |
| CastleKnight Management LP added | 458,500 | $2M | 0.4% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 446,277 | $2M | 0.4% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 435,890 | $2M | 0.4% | 2026-Q2 |
| CONTRARIAN CAPITAL MANAGEMENT, L.L.C. | 413,706 | $2M | 0.3% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 380,839 | $2M | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 379,994 | $2M | 0.3% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL trimmed | 367,706 | $2M | 0.3% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 360,130 | $2M | 0.3% | 2026-Q2 |
| CITIGROUP INC added | 358,226 | $2M | 0.3% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 353,000 | $2M | 0.3% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 312,154 | $1M | 0.3% | 2026-Q2 |
| Walleye Capital LLC trimmed | 311,550 | $1M | 0.3% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 309,038 | $1M | 0.3% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC added | 303,525 | $1M | 0.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 289,600 | $1M | 0.2% | 2026-Q2 |
| BARCLAYS PLC added | 272,836 | $1M | 0.2% | 2026-Q2 |
| Invesco Ltd. trimmed | 265,992 | $1M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 257,792 | $1M | 0.2% | 2026-Q2 |
| WOLVERINE ASSET MANAGEMENT LLC | 255,899 | $1M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 212,339 | $1M | 0.2% | 2026-Q2 |
| Redhawk Wealth Advisors, Inc. trimmed | 211,024 | $1M | 0.2% | 2026-Q2 |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd trimmed | 208,222 | $987K | 0.2% | 2026-Q2 |
| FMR LLC added | 205,883 | $976K | 0.2% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 182,017 | $863K | 0.1% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 180,827 | $857K | 0.1% | 2026-Q2 |
| PDT Partners, LLC trimmed | 169,823 | $805K | 0.1% | 2026-Q2 |
| Integrated Quantitative Investments LLC trimmed | 169,333 | $803K | 0.1% | 2026-Q2 |
| Legato Capital Management LLC added | 169,333 | $803K | 0.1% | 2026-Q2 |
| TRED AVON FAMILY WEALTH, LLC added | 166,985 | $792K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 159,471 | $756K | 0.1% | 2026-Q2 |
| Mariner, LLC added | 156,722 | $743K | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 153,928 | $730K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 147,832 | $599K | 0.1% | 2026-Q2 |
| Essex Financial Services, Inc. trimmed | 144,150 | $683K | 0.1% | 2026-Q2 |
| Counterpoint Mutual Funds LLC | 136,732 | $648K | 0.1% | 2026-Q2 |
| Dakota Wealth Management trimmed | 133,934 | $635K | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 126,157 | $598K | 0.1% | 2026-Q2 |
| Odyssean, LLC added | 125,725 | $596K | 0.1% | 2026-Q2 |
| Graham Capital Management, L.P. added | 124,878 | $592K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 122,111 | $579K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 112,506 | $534K | 0.1% | 2026-Q2 |
| TD Waterhouse Canada Inc. new | 107,586 | $505K | 0.1% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO trimmed | 105,814 | $502K | 0.1% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP | 100,000 | $474K | 0.1% | 2026-Q2 |
| Jain Global LLC trimmed | 84,900 | $402K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 84,688 | $401K | 0.1% | 2026-Q2 |
| NORGES BANK trimmed | 80,022 | $379K | 0.1% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 79,560 | $377K | 0.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC | 76,458 | $362K | 0.1% | 2026-Q2 |
| Measured Wealth Private Client Group, LLC trimmed | 68,692 | $326K | 0.1% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC added | 66,426 | $312K | 0.1% | 2026-Q2 |
| HUB Investment Partners, LLC added | 65,880 | $312K | 0.1% | 2026-Q2 |
| EP Wealth Advisors, LLC added | 65,625 | $311K | 0.1% | 2026-Q2 |
| WINTON GROUP Ltd new | 65,100 | $309K | 0.1% | 2026-Q2 |
| Quantbot Technologies LP trimmed | 63,356 | $300K | 0.1% | 2026-Q2 |
| Sterling Capital Management LLC trimmed | 57,957 | $275K | 0.0% | 2026-Q2 |
| VIRTUS ADVISERS, LLC added | 54,997 | $261K | 0.0% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 53,466 | $248K | 0.0% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 51,642 | $245K | 0.0% | 2026-Q2 |
| Glendon Capital Management LP new | 47,852 | $227K | 0.0% | 2026-Q2 |
| PIAR LLC new | 47,370 | $225K | 0.0% | 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.