SPINX — Siit S&P 500 Index Fund
Data updated: 2026-07-29
SPINX — Siit S&P 500 Index Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. United States Large Cap Blend / Core Equity · $4.59B AUM · 0.12% expense ratio · 29.7% 1-yr return. From SEC regulatory filings.
SPINX Fund Overview
SPINX — Siit S&P 500 Index Fund is a US mutual fund managed by Sei Institutional Investments Trust, categorised as United States Large 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 Large Cap Blend / Core Equity
- Assets under management: $4.59B
- 1-year return: 29.7%
- Ticker: SPINX
- SEC CIK: 0000939934
- SEC series ID: S000043383
- Share class ID: C000134335
SPINX Holdings
Top 10 holdings of Siit S&P 500 Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| NVIDIA Corporation | 7.76% |
| Apple Inc. | 6.93% |
| Microsoft Corporation | 5.06% |
| Amazon.com, Inc. | 4.00% |
| Alphabet Inc. | 3.35% |
| Broadcom Inc. | 3.20% |
| Alphabet Inc. | 2.66% |
| Meta Platforms, Inc. | 2.09% |
| Tesla, Inc. | 1.85% |
| Micron Technology, Inc. | 1.65% |
SPINX Portfolio Allocation
Asset-class allocation of Siit S&P 500 Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 98.2% |
| Derivatives | 2.3% |
| Cash & Equivalents | 1.6% |
SPINX Performance
Total returns for SPINX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 12.1% |
| 1 year | 29.7% |
| 3 years (annualised) | 23.5% |
| 5 years (annualised) | 14.1% |
SPINX Risk Information
Risk metrics for SPINX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 13.1%
SPINX Costs and Fees
SPINX costs about $12 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.12%
- Gross expense ratio: 0.12%
- Portfolio turnover: 5%
- Brokerage commissions: 0.08 bps of average net assets (SEC N-CEN)
SPINX Cashflows
Over the 12 months to 2026-02, Siit S&P 500 Index Fund had net outflows of $131.19M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | $305.70M |
| 2026-01 | −$3.47M |
| 2025-12 | −$6.05M |
| 2025-11 | −$131.66M |
| 2025-10 | −$145.16M |
| 2025-09 | −$1.85M |
SPINX Debt Constituents
No individual debt constituents are reported in Siit S&P 500 Index Fund's latest SEC N-PORT filing.
SPINX Prospectus and SEC Filings
Official Siit S&P 500 Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other United States Large 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.