# State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF

State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF is a ETF series of SPDR SERIES TRUST (series S000006986). Net assets $15.6B as of 2026-03-31. Index fund.

## Profile

- Series ID: S000006986
- Registrant: SPDR SERIES TRUST
- LEI: 549300TKUU0ZLRVSLJ96
- Net assets: $15.6B
- Total assets: $16.0B
- As of: 2026-03-31
- Type: ETF, Index

## Advisers

- [SSGA Funds Management, Inc. (Advisor)](https://search.stillhousedata.com/firm/111242)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [State Street Global Advisors](https://search.stillhousedata.com/security/857492706) | — | $370.1M | 236.84% |
| TechnipFMC PLC | — | $136.6M | 87.43% |
| [Casey's General Stores Inc](https://search.stillhousedata.com/security/147528103) | — | $131.8M | 84.36% |
| [United Therapeutics Corp](https://search.stillhousedata.com/security/91307C102) | — | $124.7M | 79.82% |
| [Curtiss-Wright Corp](https://search.stillhousedata.com/security/231561101) | — | $122.7M | 78.52% |
| Flex Ltd | — | $117.6M | 75.25% |
| [XPO Inc](https://search.stillhousedata.com/security/983793100) | — | $111.3M | 71.26% |
| [Woodward Inc](https://search.stillhousedata.com/security/980745103) | — | $104.3M | 66.71% |
| [Royal Gold Inc](https://search.stillhousedata.com/security/780287108) | — | $100.7M | 64.46% |
| [US Foods Holding Corp](https://search.stillhousedata.com/security/912008109) | — | $99.4M | 63.58% |
| [Burlington Stores Inc](https://search.stillhousedata.com/security/122017106) | — | $98.8M | 63.25% |
| [ATI Inc](https://search.stillhousedata.com/security/01741R102) | — | $96.6M | 61.79% |
| [MasTec Inc](https://search.stillhousedata.com/security/576323109) | — | $96.4M | 61.70% |
| [Carpenter Technology Corp](https://search.stillhousedata.com/security/144285103) | — | $95.9M | 61.38% |
| nVent Electric PLC | — | $93.2M | 59.67% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $15.6B |
| 2025-12-31 | $15.0B |
| 2025-09-30 | $14.4B |
| 2025-06-30 | $13.2B |
| 2025-03-31 | $12.1B |
| 2024-12-31 | $12.1B |
| 2024-09-30 | $11.3B |
| 2024-06-30 | $10.1B |

## More

- [Registrant: SPDR SERIES TRUST](https://search.stillhousedata.com/registrant/1064642)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000006986.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

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.