TRMNX — T. Rowe Price Mid-Cap Index Fund
Data updated: 2026-08-27
TRMNX — T. Rowe Price Mid-Cap Index Fund. United States Mid Cap Blend / Core Equity · $503.33M AUM. Holdings, fees, performance and SEC filings.
TRMNX Fund Overview
TRMNX — T. Rowe Price Mid-Cap Index Fund is a US mutual fund managed by T. Rowe Price Index Trust, Inc., categorised as United States Mid Cap Blend / Core Equity. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: T. Rowe Price Index Trust, Inc.
- Category: United States Mid Cap Blend / Core Equity
- Assets under management: $503.33M
- 1-year return: 22.1%
- Ticker: TRMNX
- SEC CIK: 0000858581
- SEC series ID: S000051326
- Share class ID: C000161835
TRMNX Holdings
Top 10 holdings of T. Rowe Price Mid-Cap Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Grs - Security Lending Collateral | 3.01% |
| Space Exploration Techn-Cl A | 1.60% |
| Snowflake, Inc. | 1.50% |
| Bloom Energy Corp.- A | 1.43% |
| Cloudflare, Inc. - Class A | 1.37% |
| Astera Labs, Inc. | 1.31% |
| Spotify Technology SA | 1.28% |
| Rocket Lab Corp. | 0.96% |
| Cheniere Energy, Inc. | 0.88% |
| Nu Holdings Ltd/cayman Isl-A | 0.82% |
TRMNX Portfolio Allocation
Asset-class allocation of T. Rowe Price Mid-Cap Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 99.8% |
| Cash & Equivalents | 3.2% |
TRMNX Performance
Total returns for TRMNX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 14.6% |
| 1 year | 22.1% |
| 3 years (annualised) | 20.1% |
| 5 years (annualised) | 7.0% |
TRMNX Risk Information
Risk metrics for TRMNX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 10.8%
TRMNX Costs and Fees
TRMNX costs about $27 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.27%
- Gross expense ratio: 0.90%
- Portfolio turnover: 39%
- Brokerage commissions: 0.89 bps of average net assets (SEC N-CEN)
TRMNX Cashflows
Over the 12 months to 2026-06, T. Rowe Price Mid-Cap Index Fund had net inflows of $149.18M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $4.35M |
| 2026-05 | $49.19M |
| 2026-04 | $4.65M |
| 2026-03 | $4.13M |
| 2026-02 | $16.29M |
| 2026-01 | $13.57M |
TRMNX Debt Constituents
No individual debt constituents are reported in T. Rowe Price Mid-Cap Index Fund's latest SEC N-PORT filing.
TRMNX Prospectus and SEC Filings
Official T. Rowe Price Mid-Cap Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-02-25
- Prospectus (485BPOS) — filed 2025-02-25
- Prospectus (485BPOS) — filed 2024-04-25
- Portfolio holdings (N-PORT) — filed 2026-08-27
- Portfolio holdings (N-PORT) — filed 2026-05-28
- Portfolio holdings (N-PORT) — filed 2026-02-26
- Annual census (N-CEN) — filed 2026-03-13
- Annual census (N-CEN) — filed 2025-03-14
Related Funds
Other United States Mid Cap Blend / Core Equity funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.