# Pioneer Natural Resources Co.

Pioneer Natural Resources Co. is a security (CUSIP 723787AQ0) tracked across SEC portfolio filings. 12 registered fund positions totaling $22.9M via N-PORT as of 2026-05-31.

## Summary

- Issuer: Pioneer Natural Resources Co.
- CUSIP: 723787AQ0
- Asset category: DBT
- 13F holders: 0
- N-PORT fund positions: 12
- N-PORT value: $22.9M
- N-PORT report: 2026-05-31

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [MFS Limited Maturity Fund](https://search.stillhousedata.com/fund/S000002495) | MFS Series Trust IX | $15.9M | 47.68% |
| [Master Total Return Portfolio](https://search.stillhousedata.com/fund/S000004067) | Master Bond LLC | $2.4M | 1.28% |
| MFS INTERMEDIATE INCOME TRUST | MFS INTERMEDIATE INCOME TRUST | $1.6M | 52.61% |
| [JPMorgan Core Bond Trust](https://search.stillhousedata.com/fund/S000007337) | JPMorgan Institutional Trust | $948K | 2.04% |
| [Six Circles Global Bond Fund](https://search.stillhousedata.com/fund/S000068181) | SIX CIRCLES TRUST | $944K | 0.56% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $333K | 0.06% |
| [AB Short Duration Income ETF](https://search.stillhousedata.com/fund/S000083865) | AB Active ETFs, Inc. | $257K | 14.77% |
| [GMO Systematic Investment Grade Credit ETF](https://search.stillhousedata.com/fund/S000088550) | GMO ETF Trust | $149K | 53.22% |
| [MFS Global Alternative Strategy Fund](https://search.stillhousedata.com/fund/S000019515) | MFS Series Trust XV | $139K | 6.41% |
| [PF Managed Bond Fund](https://search.stillhousedata.com/fund/S000001893) | Pacific Funds Series Trust | $110K | 3.01% |
| [MFS Corporate Bond Portfolio](https://search.stillhousedata.com/fund/S000002634) | MFS VARIABLE INSURANCE TRUST II | $85K | 6.74% |
| [Core Fixed Income Fund](https://search.stillhousedata.com/fund/S000008437) | MORGAN STANLEY PATHWAY FUNDS | $45K | 0.25% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/723787AQ0.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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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.