Form
SCHEDULE 13G/A
Passive or exempt beneficial ownership filing.
VIKING GLOBAL INVESTORS LP - 31 Mar 2026 SCHEDULE 13G/A Report for Adaptive Biotechnologies Corp Common Stock, par value $0.0001 per share (ADPT)
- Filing manager
- VIKING GLOBAL INVESTORS LP
- Reporting owner
- VIKING GLOBAL INVESTORS LP
- Beneficially owned shares
- 29,993,708 shares
- Large-stake signal
-
Ownership
19%Beneficial ownership of this reported class.
Shares
29,993,708 sharesShares beneficially owned as disclosed.
Event date
31 Mar 2026Date tied to the ownership event or amendment.
Accepted by SEC
15 May 2026EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 19%
- Symbol
- ADPT
- Shares outstanding
- 159,541,000 shares
- SEC form
- SCHEDULE 13G/A
- Accepted by SEC
- 15 May 2026, 17:48:36 UTC
- Event date
- 31 Mar 2026
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
4 source fields
Key filing fact
VIKING GLOBAL INVESTORS LP disclosed 19% ownership in Adaptive Biotechnologies Corp Common Stock, par value $0.0001 per share (ADPT) on 31 Mar 2026.
Key facts
- VIKING GLOBAL INVESTORS LP filed SCHEDULE 13G/A for Adaptive Biotechnologies Corp Common Stock, par value $0.0001 per share (ADPT).
- Disclosed ownership: 19%.
- Date of event: 31 Mar 2026.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 15 May 2026, 17:48.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (8)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| VIKING GLOBAL INVESTORS LP | 19% | 29,993,708 | 0 | 29,993,708 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of Viking Global Investors LP (1)(2) | |
| VIKING GLOBAL PERFORMANCE LLC | 14% | 22,002,189 | 0 | 22,002,189 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of Viking Global Performance LLC (1)(2) | |
| Viking Global Equities II LP | 0.3% | 440,046 | 0 | 440,046 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of Viking Global Equities II LP (1)(2) | |
| Viking Global Equities Master Ltd. | 14% | 21,562,143 | 0 | 21,562,143 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of Viking Global Equities Master Ltd. (1)(2) | |
| Viking Long Fund GP LLC | 5% | 7,991,519 | 0 | 7,991,519 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of Viking Long Fund GP LLC (1)(2) | |
| Viking Long Fund Master Ltd. | 5% | 7,991,519 | 0 | 7,991,519 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of Viking Long Fund Master Ltd. (1)(2) | |
| HALVORSEN OLE ANDREAS | 19% | 29,993,708 | 0 | 29,993,708 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of O. Andreas Halvorsen (1) | |
| Shabet Rose Sharon | 19% | 29,993,708 | 0 | 29,993,708 | /s/ Scott M. Hendler | Scott M. Hendler on behalf of Rose S. Shabet (2) |
CIK / CUSIP context first