Who owns WGS (WGS)
Which tracked institutional funds hold WGS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See WGS 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
The tracked-fund tape on WGS is one-sided between 2025-Q4 and 2026-Q1: 38 added or opened and 154 trimmed or exited — on balance reducing.
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
WGS’s largest tracked holder by dollar value, Corvex Management LP, sizes it at 8.2% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 8.2pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in WGS 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 253 tracked filers holding WGS, 142 increased or opened the position and 164 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 WGS 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 17
- VANGUARD CAPITAL MANAGEMENT LLC$55M
- EVENTIDE ASSET MANAGEMENT, LLC$29M
- Vestal Point Capital, LP$16M
- First Light Asset Management, LLC$16M
- Aberdeen Group plc$15M
- VANGUARD PORTFOLIO MANAGEMENT LLC$11M
Full exits 34
- VANGUARD GROUP INC$132M
- ORACLE INVESTMENT MANAGEMENT INC$115M
- Driehaus Capital Management LLC$51M
- JENNISON ASSOCIATES LLC$39M
- NEXT CENTURY GROWTH INVESTORS LLC$23M
- Telemark Asset Management, LLC$13M
Largest adds
- Prosight Management, LP$26M
- CITADEL ADVISORS LLC$18M
- Thrivent Financial for Lutherans$10M
- Engineers Gate Manager LP$8M
- ARK Investment Management LLC$6M
- Rockefeller Capital Management L.P.$6M
Largest trims
- Casdin Capital, LLC$198M
- Corvex Management LP$190M
- BlackRock, Inc.$103M
- FRANKLIN RESOURCES INC$103M
- FMR LLC$90M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC$89M
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 |
|---|---|---|---|---|
| Corvex Management LP added | 3,228,149 | $207M | 8.5% | 2026-Q1 |
| Casdin Capital, LLC | 3,007,164 | $193M | 7.9% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,550,708 | $100M | 4.1% | 2026-Q1 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 1,369,108 | $88M | 3.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,334,980 | $86M | 3.5% | 2026-Q1 |
| ARK Investment Management LLC added | 1,324,583 | $85M | 3.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 858,583 | $55M | 2.3% | 2026-Q1 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 775,269 | $50M | 2.0% | 2026-Q1 |
| Zweig-DiMenna Associates LLC added | 689,290 | $44M | 1.8% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 647,401 | $42M | 1.7% | 2026-Q1 |
| Amova Asset Management Americas, Inc. added | 638,800 | $41M | 1.7% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. added | 633,457 | $41M | 1.7% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 607,221 | $39M | 1.6% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 610,073 | $39M | 1.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 549,147 | $35M | 1.4% | 2026-Q1 |
| MORGAN STANLEY added | 532,235 | $34M | 1.4% | 2026-Q1 |
| Prosight Management, LP added | 523,463 | $34M | 1.4% | 2026-Q1 |
| Invesco Ltd. trimmed | 522,139 | $34M | 1.4% | 2026-Q1 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC trimmed | 479,418 | $31M | 1.3% | 2026-Q1 |
| STATE STREET CORP added | 472,445 | $30M | 1.2% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC new | 459,015 | $29M | 1.2% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 358,978 | $23M | 0.9% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 336,289 | $22M | 0.9% | 2026-Q1 |
| Capital International Investors added | 324,588 | $21M | 0.9% | 2026-Q1 |
| Bank of New York Mellon Corp added | 315,508 | $20M | 0.8% | 2026-Q1 |
| GAGNON SECURITIES LLC added | 303,149 | $19M | 0.8% | 2026-Q1 |
| FMR LLC trimmed | 289,550 | $19M | 0.8% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 265,791 | $17M | 0.7% | 2026-Q1 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 261,370 | $17M | 0.7% | 2026-Q1 |
| Vestal Point Capital, LP new | 250,000 | $16M | 0.7% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 249,432 | $16M | 0.7% | 2026-Q1 |
| First Light Asset Management, LLC new | 242,927 | $16M | 0.6% | 2026-Q1 |
| Science & Technology Partners, L.P. added | 241,200 | $15M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 234,606 | $15M | 0.6% | 2026-Q1 |
| Aberdeen Group plc added | 230,096 | $15M | 0.6% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 221,245 | $14M | 0.6% | 2026-Q1 |
| RA CAPITAL MANAGEMENT, L.P. added | 209,887 | $13M | 0.6% | 2026-Q1 |
| FRED ALGER MANAGEMENT, LLC trimmed | 202,771 | $13M | 0.5% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 195,889 | $13M | 0.5% | 2026-Q1 |
| Alamea Verwaltungs GmbH | 185,989 | $12M | 0.5% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 184,514 | $12M | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 175,767 | $11M | 0.5% | 2026-Q1 |
| ASHFORD CAPITAL MANAGEMENT INC added | 174,512 | $11M | 0.5% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 173,386 | $11M | 0.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 170,615 | $11M | 0.4% | 2026-Q1 |
| Thrivent Financial for Lutherans added | 153,721 | $10M | 0.4% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 153,716 | $10M | 0.4% | 2026-Q1 |
| Capital Research Global Investors added | 151,055 | $10M | 0.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 149,906 | $10M | 0.4% | 2026-Q1 |
| Gagnon Advisors, LLC added | 148,225 | $10M | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 144,457 | $9M | 0.4% | 2026-Q1 |
| ROYCE & ASSOCIATES LP added | 140,513 | $9M | 0.4% | 2026-Q1 |
| Engineers Gate Manager LP added | 132,962 | $9M | 0.3% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 102,929 | $7M | 0.3% | 2026-Q1 |
| Portolan Capital Management, LLC added | 102,575 | $7M | 0.3% | 2026-Q1 |
| ARDSLEY ADVISORY PARTNERS LP added | 100,000 | $6M | 0.3% | 2026-Q1 |
| Granahan Investment Management, LLC added | 96,605 | $6M | 0.3% | 2026-Q1 |
| Rockefeller Capital Management L.P. added | 96,590 | $6M | 0.3% | 2026-Q1 |
| Assenagon Asset Management S.A. trimmed | 95,128 | $6M | 0.2% | 2026-Q1 |
| NORGES BANK | 68,000 | $6M | 0.2% | 2026-Q1 |
| Palisades Investment Partners, LLC added | 91,996 | $6M | 0.2% | 2026-Q1 |
| T. Rowe Price Investment Management, Inc. trimmed | 86,082 | $6M | 0.2% | 2026-Q1 |
| POLEN CAPITAL MANAGEMENT LLC added | 77,419 | $5M | 0.2% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 77,369 | $5M | 0.2% | 2026-Q1 |
| Trexquant Investment LP added | 77,350 | $5M | 0.2% | 2026-Q1 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC added | 76,383 | $5M | 0.2% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 75,795 | $5M | 0.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 74,602 | $5M | 0.2% | 2026-Q1 |
| PEREGRINE CAPITAL MANAGEMENT LLC added | 71,572 | $5M | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 70,105 | $5M | 0.2% | 2026-Q1 |
| RENAISSANCE GROUP LLC added | 66,977 | $4M | 0.2% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 63,505 | $4M | 0.2% | 2026-Q1 |
| Legal Advantage Investments, Inc. added | 61,675 | $4M | 0.2% | 2026-Q1 |
| Impax Asset Management Group plc | 60,000 | $4M | 0.2% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 1,017,287 | $132M | 5.4% | 2025-Q4 stale |
| ORACLE INVESTMENT MANAGEMENT INC trimmed | 884,654 | $115M | 4.7% | 2025-Q4 stale |
| Driehaus Capital Management LLC trimmed | 395,323 | $51M | 2.1% | 2025-Q4 stale |
| JENNISON ASSOCIATES LLC trimmed | 302,149 | $39M | 1.6% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 269,040 | $29M | 1.2% | 2025-Q3 stale |
| AMERICAN CENTURY COMPANIES INC added | 269,602 | $24M | 1.0% | 2025-Q1 stale |
| NEXT CENTURY GROWTH INVESTORS LLC trimmed | 173,411 | $23M | 0.9% | 2025-Q4 stale |
| Telemark Asset Management, LLC trimmed | 100,000 | $13M | 0.5% | 2025-Q4 stale |
| Nicholas Investment Partners, LP added | 131,610 | $12M | 0.5% | 2025-Q1 stale |
| TANG CAPITAL MANAGEMENT LLC | 100,000 | $11M | 0.4% | 2025-Q3 stale |
| CASTLEARK MANAGEMENT LLC added | 74,016 | $10M | 0.4% | 2025-Q4 stale |
| Polar Asset Management Partners Inc. added | 97,604 | $9M | 0.4% | 2025-Q2 stale |
| SG Americas Securities, LLC added | 63,181 | $8M | 0.3% | 2025-Q4 stale |
| AXA S.A. new | 88,269 | $8M | 0.3% | 2025-Q2 stale |
| Divisadero Street Capital Management, LP | 73,146 | $8M | 0.3% | 2025-Q3 stale |
| Pentwater Capital Management LP trimmed | 50,000 | $7M | 0.3% | 2025-Q4 stale |
| BOSUN ASSET MANAGEMENT, LLC trimmed | 69,858 | $6M | 0.3% | 2025-Q2 stale |
| AXA Investment Managers S.A. new | 58,180 | $6M | 0.3% | 2025-Q3 stale |
| Jump Financial, LLC trimmed | 46,200 | $6M | 0.2% | 2025-Q4 stale |
| Catalio Capital Management, LP new | 61,507 | $6M | 0.2% | 2025-Q2 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 61,012 | $5M | 0.2% | 2025-Q1 stale |
| Lisanti Capital Growth, LLC trimmed | 41,128 | $5M | 0.2% | 2025-Q4 stale |
| Jain Global LLC added | 51,701 | $5M | 0.2% | 2025-Q1 stale |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 34,704 | $5M | 0.2% | 2025-Q4 stale |
| EFG Asset Management (North America) Corp. added | 36,505 | $4M | 0.2% | 2025-Q3 stale |
| JANE STREET GROUP, LLC trimmed | 29,625 | $4M | 0.2% | 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.