Who owns CMPO (CMPO)
Which tracked institutional funds hold CMPO, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CMPO 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
69 tracked funds added or opened CMPO while 62 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
CMPO’s largest tracked holder by dollar value, Platinum Equity Advisors, LLC/DE, sizes it at 10.2% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 10.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CMPO 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 202 tracked filers holding CMPO, 128 increased or opened the position and 113 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 CMPO 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 21
- Platinum Equity Advisors, LLC/DE$903M
- VANGUARD PORTFOLIO MANAGEMENT LLC$141M
- VANGUARD CAPITAL MANAGEMENT LLC$132M
- Alberta Investment Management Corp$92M
- Starboard Value LP$86M
- VANGUARD FIDUCIARY TRUST CO$21M
Full exits 30
- VANGUARD GROUP INC$89M
- Progeny 3, Inc.$24M
- TWO SIGMA INVESTMENTS, LP$18M
- Woodson Capital Management, LP$14M
- TWO SIGMA ADVISERS, LP$13M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$11M
Largest adds
- FMR LLC$674M
- Alyeska Investment Group, L.P.$356M
- BlackRock, Inc.$142M
- BARROW HANLEY MEWHINNEY & STRAUSS LLC$92M
- CORSAIR CAPITAL MANAGEMENT, L.P.$64M
- LOCUST WOOD CAPITAL ADVISERS, LLC$63M
Largest trims
- WELLINGTON MANAGEMENT GROUP LLP$44M
- Tidal Investments LLC$20M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$17M
- Tikvah Management LLC$12M
- RENAISSANCE TECHNOLOGIES LLC$11M
- Invesco Ltd.$10M
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 |
|---|---|---|---|---|
| Platinum Equity Advisors, LLC/DE new | 52,829,757 | $903M | 19.7% | 2026-Q1 |
| FMR LLC added | 39,551,933 | $676M | 14.7% | 2026-Q1 |
| Alyeska Investment Group, L.P. added | 21,395,253 | $366M | 8.0% | 2026-Q1 |
| LOCUST WOOD CAPITAL ADVISERS, LLC added | 13,696,778 | $234M | 5.1% | 2026-Q1 |
| BlackRock, Inc. added | 13,677,162 | $234M | 5.1% | 2026-Q1 |
| Capital Research Global Investors added | 11,260,713 | $193M | 4.2% | 2026-Q1 |
| CORSAIR CAPITAL MANAGEMENT, L.P. added | 8,465,789 | $145M | 3.2% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 8,270,457 | $141M | 3.1% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 7,720,738 | $132M | 2.9% | 2026-Q1 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC added | 5,601,505 | $96M | 2.1% | 2026-Q1 |
| Alberta Investment Management Corp added | 5,405,406 | $92M | 2.0% | 2026-Q1 |
| Capital World Investors added | 5,188,038 | $89M | 1.9% | 2026-Q1 |
| Starboard Value LP new | 5,027,028 | $86M | 1.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,177,756 | $71M | 1.6% | 2026-Q1 |
| Bleichroeder LP trimmed | 3,969,676 | $68M | 1.5% | 2026-Q1 |
| STATE STREET CORP added | 3,936,536 | $67M | 1.5% | 2026-Q1 |
| UBS Group AG added | 3,824,216 | $65M | 1.4% | 2026-Q1 |
| Nine Ten Capital Management LLC added | 2,904,544 | $50M | 1.1% | 2026-Q1 |
| T. Rowe Price Investment Management, Inc. added | 2,866,148 | $49M | 1.1% | 2026-Q1 |
| Thrivent Financial for Lutherans trimmed | 2,787,307 | $48M | 1.0% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 2,116,195 | $36M | 0.8% | 2026-Q1 |
| Clearbridge Investments, LLC added | 1,891,738 | $32M | 0.7% | 2026-Q1 |
| MORGAN STANLEY added | 1,880,334 | $32M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP added | 1,810,522 | $31M | 0.7% | 2026-Q1 |
| Zuckerman Investment Group, LLC trimmed | 1,588,722 | $27M | 0.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,473,259 | $25M | 0.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,285,009 | $22M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,232,026 | $21M | 0.5% | 2026-Q1 |
| Chescapmanager LLC added | 1,064,811 | $18M | 0.4% | 2026-Q1 |
| BWCP, LP added | 1,059,839 | $18M | 0.4% | 2026-Q1 |
| Tikvah Management LLC trimmed | 1,009,181 | $17M | 0.4% | 2026-Q1 |
| AlTi Global, Inc. | 807,557 | $14M | 0.3% | 2026-Q1 |
| Tidal Investments LLC trimmed | 676,454 | $12M | 0.3% | 2026-Q1 |
| Ancora Advisors LLC added | 623,461 | $11M | 0.2% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 561,418 | $10M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 503,730 | $9M | 0.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 458,333 | $8M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 436,898 | $7M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 426,555 | $7M | 0.2% | 2026-Q1 |
| Catawba River Capital added | 386,718 | $7M | 0.1% | 2026-Q1 |
| Swiss National Bank added | 368,600 | $6M | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 358,598 | $6M | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 345,489 | $6M | 0.1% | 2026-Q1 |
| Ballast Asset Management, LP added | 290,423 | $5M | 0.1% | 2026-Q1 |
| BARD ASSOCIATES INC trimmed | 285,113 | $5M | 0.1% | 2026-Q1 |
| FIRST MANHATTAN CO. LLC. trimmed | 270,512 | $5M | 0.1% | 2026-Q1 |
| RICE HALL JAMES & ASSOCIATES, LLC trimmed | 255,395 | $4M | 0.1% | 2026-Q1 |
| Prospect Capital Advisors, LLC trimmed | 240,310 | $4M | 0.1% | 2026-Q1 |
| CANNELL CAPITAL LLC trimmed | 238,175 | $4M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 206,984 | $4M | 0.1% | 2026-Q1 |
| Archon Partners LLC new | 230,000 | $4M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 219,467 | $4M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 193,178 | $3M | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 186,865 | $3M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 184,785 | $3M | 0.1% | 2026-Q1 |
| Legal & General Group Plc added | 159,313 | $3M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 146,251 | $3M | 0.1% | 2026-Q1 |
| Uniplan Investment Counsel, Inc. trimmed | 142,897 | $2M | 0.1% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 129,048 | $2M | 0.0% | 2026-Q1 |
| Potomac Capital Management, Inc. trimmed | 113,500 | $2M | 0.0% | 2026-Q1 |
| Pillsbury Lake Capital LLC trimmed | 108,755 | $2M | 0.0% | 2026-Q1 |
| GABELLI FUNDS LLC added | 107,510 | $2M | 0.0% | 2026-Q1 |
| Invesco Ltd. trimmed | 106,401 | $2M | 0.0% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 103,077 | $2M | 0.0% | 2026-Q1 |
| SCOPUS ASSET MANAGEMENT, L.P. new | 100,000 | $2M | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 4,595,137 | $89M | 1.9% | 2025-Q4 stale |
| Progeny 3, Inc. added | 1,268,000 | $24M | 0.5% | 2025-Q4 stale |
| TWO SIGMA INVESTMENTS, LP added | 909,435 | $18M | 0.4% | 2025-Q4 stale |
| ARISTEIA CAPITAL, L.L.C. added | 2,627,211 | $16M | 0.4% | 2025-Q2 stale |
| Woodson Capital Management, LP trimmed | 740,000 | $14M | 0.3% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP trimmed | 684,188 | $13M | 0.3% | 2025-Q4 stale |
| Walleye Capital LLC trimmed | 1,888,774 | $12M | 0.3% | 2025-Q2 stale |
| Tyro Capital Management LLC trimmed | 1,018,107 | $11M | 0.2% | 2025-Q1 stale |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 562,713 | $11M | 0.2% | 2025-Q4 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 539,380 | $10M | 0.2% | 2025-Q4 stale |
| Skaana Management L.P. added | 1,655,805 | $10M | 0.2% | 2025-Q2 stale |
| JUPITER ASSET MANAGEMENT LTD trimmed | 323,285 | $7M | 0.1% | 2025-Q3 stale |
| Atom Investors LP trimmed | 334,666 | $6M | 0.1% | 2025-Q4 stale |
| Steamboat Capital Partners, LLC added | 330,629 | $6M | 0.1% | 2025-Q4 stale |
| MIRABELLA FINANCIAL SERVICES LLP new | 520,000 | $6M | 0.1% | 2025-Q1 stale |
| GUARDIAN POINT CAPITAL, LP | 520,000 | $6M | 0.1% | 2025-Q1 stale |
| SIMPLEX TRADING, LLC trimmed | 259,688 | $5M | 0.1% | 2025-Q4 stale |
| CSS LLC/IL added | 798,189 | $5M | 0.1% | 2025-Q2 stale |
| HRT FINANCIAL LP added | 232,572 | $5M | 0.1% | 2025-Q3 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. new | 250,000 | $5M | 0.1% | 2025-Q4 stale |
| Informed Momentum Co LLC trimmed | 234,967 | $5M | 0.1% | 2025-Q4 stale |
| GROUP ONE TRADING LLC trimmed | 231,710 | $4M | 0.1% | 2025-Q4 stale |
| Otter Creek Advisors, LLC trimmed | 214,026 | $4M | 0.1% | 2025-Q3 stale |
| Pacer Advisors, Inc. new | 380,718 | $4M | 0.1% | 2025-Q1 stale |
| CITADEL ADVISORS LLC added | 211,347 | $4M | 0.1% | 2025-Q4 stale |
| Verition Fund Management LLC added | 203,016 | $4M | 0.1% | 2025-Q4 stale |
| Decker Retirement Planning Inc. new | 175,150 | $4M | 0.1% | 2025-Q3 stale |
| Counterpoint Mutual Funds LLC added | 175,108 | $3M | 0.1% | 2025-Q4 stale |
| Hudson Bay Capital Management LP | 232,127 | $3M | 0.1% | 2025-Q4 stale |
| D. E. Shaw & Co., Inc. trimmed | 134,336 | $3M | 0.1% | 2025-Q4 stale |
| TUDOR INVESTMENT CORP ET AL added | 118,881 | $2M | 0.0% | 2025-Q4 stale |
| PDT Partners, LLC trimmed | 118,012 | $2M | 0.0% | 2025-Q4 stale |
| MONIMUS CAPITAL MANAGEMENT, LP | 108,164 | $2M | 0.0% | 2025-Q4 stale |
| CAXTON ASSOCIATES LLP trimmed | 107,009 | $2M | 0.0% | 2025-Q4 stale |
| Greenland Capital Management LP | 153,232 | $2M | 0.0% | 2025-Q3 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.