Who owns ZI (ZI)
Which tracked institutional funds hold ZI, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ZI 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
67 tracked funds added or opened ZI while 130 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
ZI’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 ZI more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ZI 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 361 tracked filers holding ZI, 230 increased or opened the position and 178 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 ZI 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 26
- VANGUARD PORTFOLIO MANAGEMENT LLC$78M
- VANGUARD CAPITAL MANAGEMENT LLC$64M
- MARSHALL WACE, LLP$14M
- Lynrock Lake LP$12M
- VANGUARD FIDUCIARY TRUST CO$10M
- Public Sector Pension Investment Board$6M
Full exits 29
- VANGUARD GROUP INC$233M
- Sachem Head Capital Management LP$150M
- Jericho Capital Asset Management L.P.$89M
- Park West Asset Management LLC$36M
- CYPRESS POINT INVESTMENT MANAGEMENT LP$15M
- KENNEDY CAPITAL MANAGEMENT LLC$15M
Largest adds
- JUPITER ASSET MANAGEMENT LTD$33M
- AQR CAPITAL MANAGEMENT LLC$12M
- MORGAN STANLEY$12M
- HRT FINANCIAL LP$9M
- Assenagon Asset Management S.A.$9M
- Gotham Asset Management, LLC$7M
Largest trims
- FMR LLC$144M
- BlackRock, Inc.$116M
- GLENVIEW CAPITAL MANAGEMENT, LLC$108M
- Greenhouse Funds LLLP$40M
- JPMORGAN CHASE & CO$39M
- DIMENSIONAL FUND ADVISORS LP$33M
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 |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 22,562,314 | $135M | 5.5% | 2026-Q1 |
| RPD Fund Management LLC added | 17,199,109 | $103M | 4.2% | 2026-Q1 |
| GLENVIEW CAPITAL MANAGEMENT, LLC trimmed | 15,905,242 | $95M | 3.9% | 2026-Q1 |
| FMR LLC trimmed | 15,840,313 | $95M | 3.9% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 15,100,675 | $90M | 3.7% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 12,962,162 | $78M | 3.2% | 2026-Q1 |
| LSV ASSET MANAGEMENT added | 12,246,562 | $73M | 3.0% | 2026-Q1 |
| Greenhouse Funds LLLP added | 11,463,138 | $69M | 2.8% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 10,755,199 | $64M | 2.6% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 9,433,408 | $56M | 2.3% | 2026-Q1 |
| STATE STREET CORP added | 9,148,566 | $55M | 2.2% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 9,100,859 | $54M | 2.2% | 2026-Q1 |
| JUPITER ASSET MANAGEMENT LTD added | 7,163,325 | $43M | 1.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 5,426,404 | $32M | 1.3% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 4,750,000 | $28M | 1.2% | 2026-Q1 |
| MORGAN STANLEY added | 4,375,366 | $26M | 1.1% | 2026-Q1 |
| Quantinno Capital Management LP added | 4,144,952 | $25M | 1.0% | 2026-Q1 |
| Pacer Advisors, Inc. added | 3,877,665 | $23M | 0.9% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 3,224,964 | $19M | 0.8% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 2,926,199 | $17M | 0.7% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 2,739,166 | $16M | 0.7% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 2,637,343 | $16M | 0.6% | 2026-Q1 |
| NORGES BANK trimmed | 1,477,690 | $15M | 0.6% | 2026-Q1 |
| MARSHALL WACE, LLP added | 2,319,145 | $14M | 0.6% | 2026-Q1 |
| Lynrock Lake LP new | 2,066,666 | $12M | 0.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,898,951 | $11M | 0.5% | 2026-Q1 |
| UBS Group AG trimmed | 1,844,291 | $11M | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 1,771,201 | $11M | 0.4% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 1,745,970 | $10M | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,657,625 | $10M | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 1,624,183 | $10M | 0.4% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 1,592,592 | $10M | 0.4% | 2026-Q1 |
| HRT FINANCIAL LP added | 1,582,508 | $9M | 0.4% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 1,538,853 | $9M | 0.4% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,528,086 | $9M | 0.4% | 2026-Q1 |
| Gotham Asset Management, LLC added | 1,504,892 | $9M | 0.4% | 2026-Q1 |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 1,486,893 | $9M | 0.4% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 1,394,519 | $8M | 0.3% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 1,301,370 | $8M | 0.3% | 2026-Q1 |
| Ardmore Road Asset Management LP added | 1,268,300 | $8M | 0.3% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 1,251,885 | $7M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,221,041 | $7M | 0.3% | 2026-Q1 |
| Robeco Institutional Asset Management B.V. added | 1,191,287 | $7M | 0.3% | 2026-Q1 |
| Invesco Ltd. trimmed | 1,134,174 | $7M | 0.3% | 2026-Q1 |
| Retirement Systems of Alabama trimmed | 1,088,013 | $7M | 0.3% | 2026-Q1 |
| WINTON GROUP Ltd added | 1,007,607 | $6M | 0.2% | 2026-Q1 |
| Public Sector Pension Investment Board added | 961,100 | $6M | 0.2% | 2026-Q1 |
| CRAMER ROSENTHAL MCGLYNN LLC trimmed | 889,757 | $5M | 0.2% | 2026-Q1 |
| CITIGROUP INC added | 852,051 | $5M | 0.2% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 816,805 | $5M | 0.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 814,332 | $5M | 0.2% | 2026-Q1 |
| Cerity Partners LLC trimmed | 814,054 | $5M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 809,869 | $5M | 0.2% | 2026-Q1 |
| Squarepoint Ops LLC added | 805,192 | $5M | 0.2% | 2026-Q1 |
| Hillsdale Investment Management Inc. | 741,815 | $4M | 0.2% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 735,317 | $4M | 0.2% | 2026-Q1 |
| INGALLS & SNYDER LLC added | 683,641 | $4M | 0.2% | 2026-Q1 |
| Dragoneer Investment Group, LLC | 670,000 | $4M | 0.2% | 2026-Q1 |
| Amundi added | 667,967 | $4M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 623,401 | $4M | 0.2% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 72,176 | $4M | 0.1% | 2026-Q1 |
| Legal & General Group Plc added | 604,174 | $4M | 0.1% | 2026-Q1 |
| ExodusPoint Capital Management, LP added | 557,244 | $3M | 0.1% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 548,108 | $3M | 0.1% | 2026-Q1 |
| KESTREL INVESTMENT MANAGEMENT CORP trimmed | 547,100 | $3M | 0.1% | 2026-Q1 |
| Corient Private Wealth LLC added | 534,664 | $3M | 0.1% | 2026-Q1 |
| Swiss National Bank trimmed | 524,300 | $3M | 0.1% | 2026-Q1 |
| Trexquant Investment LP trimmed | 521,067 | $3M | 0.1% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 500,840 | $3M | 0.1% | 2026-Q1 |
| Sone Capital Management, LLC added | 475,244 | $3M | 0.1% | 2026-Q1 |
| Creative Planning added | 473,998 | $3M | 0.1% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 456,381 | $3M | 0.1% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 423,234 | $3M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 22,941,640 | $233M | 9.5% | 2025-Q4 stale |
| MACQUARIE GROUP LTD added | 16,728,210 | $176M | 7.2% | 2025-Q3 stale |
| Sachem Head Capital Management LP trimmed | 14,795,000 | $150M | 6.1% | 2025-Q4 stale |
| Jericho Capital Asset Management L.P. | 8,793,670 | $89M | 3.7% | 2025-Q4 stale |
| Contour Asset Management LLC trimmed | 3,840,173 | $42M | 1.7% | 2025-Q3 stale |
| Park West Asset Management LLC added | 3,500,000 | $36M | 1.5% | 2025-Q4 stale |
| Hood River Capital Management LLC trimmed | 2,858,740 | $29M | 1.2% | 2025-Q2 stale |
| CYPRESS POINT INVESTMENT MANAGEMENT LP new | 1,493,867 | $15M | 0.6% | 2025-Q4 stale |
| KENNEDY CAPITAL MANAGEMENT LLC added | 1,479,924 | $15M | 0.6% | 2025-Q4 stale |
| FRANKLIN RESOURCES INC trimmed | 1,352,849 | $15M | 0.6% | 2025-Q3 stale |
| Kinetic Partners Management, LP trimmed | 1,046,480 | $11M | 0.4% | 2025-Q4 stale |
| Candlestick Capital Management LP trimmed | 992,944 | $10M | 0.4% | 2025-Q2 stale |
| CLEARFIELD CAPITAL MANAGEMENT LP new | 977,932 | $10M | 0.4% | 2025-Q2 stale |
| Harber Asset Management LLC trimmed | 853,275 | $9M | 0.4% | 2025-Q4 stale |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 781,520 | $9M | 0.3% | 2025-Q3 stale |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC added | 744,550 | $8M | 0.3% | 2025-Q2 stale |
| Tairen Capital Ltd added | 744,948 | $7M | 0.3% | 2025-Q1 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 631,729 | $6M | 0.3% | 2025-Q2 stale |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC trimmed | 549,964 | $6M | 0.2% | 2025-Q3 stale |
| Crescent Park Management, L.P. trimmed | 568,121 | $6M | 0.2% | 2025-Q4 stale |
| California Public Employees Retirement System trimmed | 469,585 | $5M | 0.2% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 391,400 | $4M | 0.2% | 2025-Q4 stale |
| AXA Investment Managers S.A. new | 357,618 | $4M | 0.2% | 2025-Q3 stale |
| Kerrisdale Advisers, LLC | 348,428 | $4M | 0.1% | 2025-Q4 stale |
| Corebridge Financial, Inc. trimmed | 299,703 | $3M | 0.1% | 2025-Q1 stale |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC trimmed | 289,147 | $3M | 0.1% | 2025-Q1 stale |
| Y-Intercept (Hong Kong) Ltd added | 246,385 | $3M | 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.