# XENON PHARMACEUTICALS INC COM

XENON PHARMACEUTICALS INC COM is a security (CUSIP 98420N105) tracked across SEC portfolio filings. 305 institutional managers reported $5.9B on Form 13F as of 2026-06-30; 35 registered fund positions totaling $614.6M via N-PORT as of 2026-05-31.

## Summary

- Issuer: XENON PHARMACEUTICALS INC
- Class: COM
- CUSIP: 98420N105
- Asset category: EC
- 13F holders: 305
- 13F value: $5.9B
- 13F period: 2026-06-30
- N-PORT fund positions: 35
- N-PORT value: $614.6M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 305 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| FMR LLC | BOSTON, MA | $629.1M | 10,818,491 |
| [Avoro Capital Advisors LLC](https://search.stillhousedata.com/firm/154091) | New York, NY | $336.0M | 5,777,777 |
| BlackRock, Inc. | New York, NY | $328.0M | 5,640,118 |
| WELLINGTON MANAGEMENT GROUP LLP | BOSTON, MA | $280.8M | 4,829,641 |
| Driehaus Capital Management LLC | Chicago, IL | $261.2M | 4,491,653 |
| [Polar Capital Holdings Plc](https://search.stillhousedata.com/firm/136133) | London, X0 | $256.2M | 4,405,312 |
| JANUS HENDERSON GROUP PLC | LONDON, X0 | $242.9M | 4,175,982 |
| [CITADEL ADVISORS LLC](https://search.stillhousedata.com/firm/148826) | MIAMI, FL | $167.8M | 2,652,990 |
| Capital International Investors | Los Angeles, CA | $155.5M | 2,674,727 |
| JPMORGAN CHASE & CO | NEW YORK, NY | $106.9M | 1,923,610 |
| STATE STREET CORP | BOSTON, MA | $100.0M | 1,720,533 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | BALA CYNWYD, PA | $98.6M | 177,137 |
| [Affinity Asset Advisors, LLC](https://search.stillhousedata.com/firm/312788) | New York, NY | $97.4M | 1,675,000 |
| DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) | New York, NY | $94.0M | 1,615,696 |
| [Holocene Advisors, LP](https://search.stillhousedata.com/firm/287999) | New York, NY | $88.3M | 1,518,686 |

## Top fund holders (N-PORT)

_Showing 15 of 35 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [SMALLCAP World Fund Inc](https://search.stillhousedata.com/fund/S000009599) | SMALLCAP World Fund Inc | $203.6M | 25.13% |
| [VANGUARD HEALTH CARE FUND](https://search.stillhousedata.com/fund/S000002922) | VANGUARD SPECIALIZED FUNDS | $150.0M | 40.69% |
| [Fidelity Advisor Health Care Fund](https://search.stillhousedata.com/fund/S000005329) | Fidelity Advisor Series VII | $33.6M | 116.47% |
| [Fidelity Contrafund](https://search.stillhousedata.com/fund/S000006037) | Fidelity Contrafund | $28.1M | 1.78% |
| [T. Rowe Price New Horizons Fund, Inc.](https://search.stillhousedata.com/fund/S000002106) | T. ROWE PRICE NEW HORIZONS FUND, INC. | $26.2M | 20.53% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $24.3M | 13.86% |
| abrdn Healthcare Investors | abrdn Healthcare Investors | $22.7M | 199.27% |
| [T. Rowe Price Small-Cap Stock Fund, Inc.](https://search.stillhousedata.com/fund/S000002120) | T. ROWE PRICE SMALL-CAP STOCK FUND, INC. | $20.7M | 25.69% |
| [AB DISCOVERY GROWTH FUND, INC.](https://search.stillhousedata.com/fund/S000010117) | AB DISCOVERY GROWTH FUND, INC. | $16.4M | 60.79% |
| [Janus Henderson Venture Fund](https://search.stillhousedata.com/fund/S000010488) | JANUS INVESTMENT FUND | $14.4M | 46.85% |
| [PGIM Jennison Health Sciences Fund](https://search.stillhousedata.com/fund/S000004380) | Prudential Sector Funds, Inc. | $13.8M | 99.70% |
| abrdn Life Sciences Investors | abrdn Life Sciences Investors | $11.8M | 210.13% |
| [T. Rowe Price Institutional Small-Cap Stock Fund](https://search.stillhousedata.com/fund/S000002094) | T. Rowe Price Equity Funds, Inc. | $10.7M | 24.63% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $8.2M | 16.93% |
| [Putnam Global Health Care Fund](https://search.stillhousedata.com/fund/S000005666) | Putnam Global Health Care Fund | $7.3M | 50.15% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/98420n105.md)
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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.