# Calvert U.S. Mid Cap Core Responsible Index Fund

Calvert U.S. Mid Cap Core Responsible Index Fund is a registered fund series of Calvert Responsible Index Series, Inc. (series S000051236). Net assets $425.3M as of 2026-03-31. Index fund.

## Profile

- Series ID: S000051236
- Registrant: Calvert Responsible Index Series, Inc.
- LEI: 549300I74Z158YTBPO44
- Net assets: $425.3M
- Total assets: $425.8M
- As of: 2026-03-31
- Type: Index

## Advisers

- [Calvert Research and Management (Advisor)](https://search.stillhousedata.com/firm/285127)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [Corning Inc](https://search.stillhousedata.com/security/219350105) | — | $4.0M | 94.36% |
| [Vertiv Holdings Co](https://search.stillhousedata.com/security/92537N108) | — | $3.6M | 84.45% |
| [Western Digital Corp](https://search.stillhousedata.com/security/958102105) | — | $3.5M | 81.73% |
| [Marvell Technology Inc](https://search.stillhousedata.com/security/573874104) | — | $3.4M | 79.95% |
| [Sandisk Corp/DE](https://search.stillhousedata.com/security/80004C200) | — | $3.4M | 79.71% |
| Seagate Technology Holdings PLC | — | $3.3M | 76.93% |
| [Quanta Services Inc](https://search.stillhousedata.com/security/74762E102) | — | $3.1M | 73.91% |
| [Cummins Inc](https://search.stillhousedata.com/security/231021106) | — | $2.9M | 67.86% |
| [Ross Stores Inc](https://search.stillhousedata.com/security/778296103) | — | $2.7M | 64.54% |
| [Warner Bros Discovery Inc](https://search.stillhousedata.com/security/934423104) | — | $2.7M | 62.52% |
| [General Motors Co](https://search.stillhousedata.com/security/37045V100) | — | $2.6M | 62.25% |
| [Sempra](https://search.stillhousedata.com/security/816851109) | — | $2.5M | 59.89% |
| [Baker Hughes Co](https://search.stillhousedata.com/security/05722G100) | — | $2.4M | 56.53% |
| TE Connectivity PLC | — | $2.4M | 56.52% |
| [PACCAR Inc](https://search.stillhousedata.com/security/693718108) | — | $2.4M | 55.84% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $425.3M |
| 2025-12-31 | $425.5M |
| 2025-09-30 | $447.3M |
| 2025-06-30 | $457.2M |
| 2025-03-31 | $444.3M |
| 2024-12-31 | $454.3M |
| 2024-09-30 | $477.6M |
| 2024-06-30 | $441.7M |

## More

- [Registrant: Calvert Responsible Index Series, Inc.](https://search.stillhousedata.com/registrant/1105446)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000051236.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.