# Fidelity Flex Mid Cap Index Fund

Fidelity Flex Mid Cap Index Fund is a registered fund series of Fidelity Salem Street Trust (series S000056358). Net assets $605.6M as of 2026-04-30. Index fund.

## Profile

- Series ID: S000056358
- Registrant: Fidelity Salem Street Trust
- LEI: 549300Y450DBH1HG6086
- Net assets: $605.6M
- Total assets: $620.9M
- As of: 2026-04-30
- Type: Index

## Advisers

- [Fidelity Management & Research Company LLC (Advisor)](https://search.stillhousedata.com/firm/108281)
- [Geode Capital Management, LLC (Subadvisor)](https://search.stillhousedata.com/firm/115504)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [Fidelity Revere Street Trust](https://search.stillhousedata.com/security/31635A303) | — | $15.3M | 252.06% |
| [ASTERA LABS INC](https://search.stillhousedata.com/security/04626A103) | — | $3.8M | 61.95% |
| FABRINET | — | $3.6M | 58.67% |
| NVENT ELECTRIC PLC | — | $3.3M | 55.25% |
| [EVERPURE INC](https://search.stillhousedata.com/security/74624M102) | — | $3.3M | 53.70% |
| [BWX TECHNOLOGIES INC](https://search.stillhousedata.com/security/05605H100) | — | $2.9M | 47.40% |
| [MKS INC](https://search.stillhousedata.com/security/55306N104) | — | $2.8M | 45.67% |
| [LOEWS CORP](https://search.stillhousedata.com/security/540424108) | — | $2.8M | 45.59% |
| [RBC BEARINGS INC](https://search.stillhousedata.com/security/75524B104) | — | $2.7M | 45.39% |
| [REDDIT INC](https://search.stillhousedata.com/security/75734B100) | — | $2.7M | 45.33% |
| [AFFIRM HOLDINGS INC](https://search.stillhousedata.com/security/00827B106) | — | $2.7M | 45.04% |
| [ITT INC](https://search.stillhousedata.com/security/45073V108) | — | $2.7M | 44.17% |
| [NEXTPOWER INC](https://search.stillhousedata.com/security/65290E101) | — | $2.6M | 42.38% |
| [API GROUP CORP](https://search.stillhousedata.com/security/00187Y100) | — | $2.5M | 42.04% |
| [EAST WEST BANCORP INC](https://search.stillhousedata.com/security/27579R104) | — | $2.5M | 41.69% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-04-30 | $605.6M |
| 2026-01-31 | $557.7M |
| 2025-10-31 | $504.3M |
| 2025-07-31 | $559.9M |
| 2025-04-30 | $495.0M |
| 2025-01-31 | $493.2M |
| 2024-10-31 | $458.8M |
| 2024-07-31 | $455.9M |

## More

- [Registrant: Fidelity Salem Street Trust](https://search.stillhousedata.com/registrant/35315)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000056358.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.