SMXAX — Siit Extended Market Index Fund
Data updated: 2026-07-29
SMXAX — Siit Extended Market Index Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. United States Mid Cap Blend / Core Equity · $1.31B AUM · 0.20% expense ratio · 30.4% 1-yr return. From SEC regulatory filings.
SMXAX Fund Overview
SMXAX — Siit Extended Market Index Fund is a US mutual fund managed by Sei Institutional Investments Trust, 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: Sei Institutional Investments Trust
- Category: United States Mid Cap Blend / Core Equity
- Assets under management: $1.31B
- 1-year return: 30.4%
- Ticker: SMXAX
- SEC CIK: 0000939934
- SEC series ID: S000035814
- Share class ID: C000109763
SMXAX Holdings
Top 10 holdings of Siit Extended Market Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Marvell Technology, Inc. | 2.06% |
| Snowflake Inc. | 1.00% |
| Spotify Technology S.a. | 0.91% |
| Cloudflare, Inc. | 0.90% |
| Rocket Lab Corporation | 0.83% |
| Bloom Energy Corporation | 0.73% |
| Flex Ltd. | 0.66% |
| Strategy, Inc. | 0.59% |
| Anglogold Ashanti PLC | 0.58% |
| Cheniere Energy, Inc. | 0.57% |
SMXAX Portfolio Allocation
Asset-class allocation of Siit Extended Market Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 98.8% |
| Derivatives | 1.4% |
| Cash & Equivalents | 1.0% |
SMXAX Performance
Total returns for SMXAX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 10.8% |
| 1 year | 30.4% |
| 3 years (annualised) | 21.4% |
| 5 years (annualised) | 7.0% |
SMXAX Risk Information
Risk metrics for SMXAX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 12.2%
SMXAX Costs and Fees
SMXAX costs about $20 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.20%
- Gross expense ratio: 0.20%
- Portfolio turnover: 21%
- Brokerage commissions: 0.39 bps of average net assets (SEC N-CEN)
SMXAX Cashflows
Over the 12 months to 2026-02, Siit Extended Market Index Fund had net inflows of $55.48M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | $119.62M |
| 2026-01 | −$12.67M |
| 2025-12 | $1.84M |
| 2025-11 | −$29.83M |
| 2025-10 | −$14.90M |
| 2025-09 | $7.06M |
SMXAX Debt Constituents
No individual debt constituents are reported in Siit Extended Market Index Fund's latest SEC N-PORT filing.
SMXAX Prospectus and SEC Filings
Official Siit Extended Market Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
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.