SDPSX — Invesco Short Duration Inflation Protected Fund
Data updated: 2026-07-30
SDPSX — Invesco Short Duration Inflation Protected Fund. Short Treasury / Sovereign Bond · $376.11M AUM. Holdings, fees, performance and SEC filings.
SDPSX Fund Overview
SDPSX — Invesco Short Duration Inflation Protected Fund is a US mutual fund managed by Aim Investment Securities Funds (invesco Investment Securities Funds), categorised as Short Treasury / Sovereign Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Aim Investment Securities Funds (invesco Investment Securities Funds)
- Category: Short Treasury / Sovereign Bond
- Assets under management: $376.11M
- 1-year return: 4.2%
- Ticker: SDPSX
- SEC CIK: 0000842790
- SEC series ID: S000000252
- Share class ID: C000164285
SDPSX Investment Objective and Strategy
Invesco Short Duration Inflation Protected Fund describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Aim Investment Securities Funds (invesco Investment Securities Funds).
Investment objective
The Funds investment objective is to provide protection from the negative effects of unanticipated inflation.
Principal investment strategy
The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in the component securities of the ICE BofA 1-5 Year US Inflation-Linked Treasury Index (the Index) and in derivatives and other instruments that have economic characteristics similar to such securities. For purposes of the Funds 80% investment policy, the Fund considers the components of the index to be short duration inflation-protected securities. The Index is comprised of U.S. Treasury Inflation-Protected Securities (TIPS) with at least $1 billion in outstanding face value, at least 18 months to maturity at point of issuance, and a remaining term to final maturity of at least 1 year and less than 5 years at the time of index rebalancing. The Fund can also invest the remainder of its assets in fixed income securities that are not included in the Index, but which the Funds investment adviser, Invesco Advisers, Inc.
(Invesco or the Adviser), believes will help the Fund track the Index. The Fund generally expects that its duration, yield and maturity will be substantially similar to those of the Index. The Fund normally seeks to maintain an average portfolio effective duration that is within +/- 1 year of the duration of the Index, which was 1.78 years as of February 28, 2026. TIPS are publicly issued, U.S dollar denominated, U.S. government debt securities issued by the U.S. Treasury that have principal and interest payments linked to official inflation (as measured by the Consumer Price Index or CPI) and their payments are supported by the full faith and credit of the United States. As of February 28, 2026, there were 20 TIPS in the Index. The Fund can invest in derivative instruments, such as swap contracts, options and futures contracts, to seek exposure to certain securities or groups of securities included in the Index.
Derivatives and other instruments that provide investment exposure to the investments that are the subject of the 80% investment policy stated above and derivatives that provide investment exposure to one or more market risk factors associated with such investments may be included in the Fund's 80% investment policy. The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis, which means that the Fund buys or sells a security with payment and delivery taking place in the future. The portfolio manager primarily uses a replication strategy to track, as closely as possible, the securities in the Index and their respective weightings, by investing directly in securities that make up the Index. The portfolio manager adjusts the composition of the Fund to reflect changes in the composition of the Index generally at each rebalance of the Index.
The Fund may also use a representative sampling methodology to track the performance of the Index. Representative sampling means that the portfolio manager may use a quantitative analysis to select either a subset of the securities that make up the Index or a combination of some or all of the securities that make up the Index and other securities that are not part of the Index. In either case, the representative sampling of securities selected by the portfolio manager should have, in the aggregate, investment characteristics that are similar to the Index in terms of key risk factors, performance attributes and other characteristics, such as market capitalization, duration, maturity, credit quality, yield and coupon, as applicable. It is expected that the portfolio manager will use this representative sampling methodology where it is difficult to acquire the necessary securities that make up the Index, where the asset levels of the Fund do not allow for the holding of all the securities that make up the Index or where it is otherwise beneficial to the Fund to do so.
Unlike many investment companies, the Fund does not utilize an investment strategy that attempts to outperform the Index. Rather, the Fund utilizes an indexing approach, which may eliminate the chance that the Fund will substantially outperform the Index, but it may also reduce some of the risk of active management. Indexing generally achieves lower costs by keeping portfolio turnover low in comparison to actively managed investment companies.
SDPSX Holdings
Top 10 holdings of Invesco Short Duration Inflation Protected Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| U.S. Treasury Inflation - Indexed Bonds | 6.05% |
| U.S. Treasury Inflation - Indexed Bonds | 6.01% |
| U.S. Treasury Inflation - Indexed Bonds | 5.77% |
| U.S. Treasury Inflation - Indexed Bonds | 5.67% |
| U.S. Treasury Inflation - Indexed Notes | 5.67% |
| U.S. Treasury Inflation - Indexed Notes | 5.58% |
| U.S. Treasury Inflation - Indexed Notes | 5.51% |
| U.S. Treasury Inflation - Indexed Notes | 5.48% |
| U.S. Treasury Inflation - Indexed Notes | 5.46% |
| U.S. Treasury Inflation - Indexed Notes | 5.30% |
SDPSX Portfolio Allocation
Asset-class allocation of Invesco Short Duration Inflation Protected Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 98.9% |
| Cash & Equivalents | 0.9% |
SDPSX Performance
Total returns for SDPSX (as of 2026-10-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.8% |
| 1 year | 4.2% |
| 3 years (annualised) | 4.9% |
| 5 years (annualised) | 2.8% |
SDPSX Risk Information
Risk metrics for SDPSX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 1.8%
SDPSX Costs and Fees
SDPSX costs about $26 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.26%
- Gross expense ratio: 0.31%
- Portfolio turnover: 41%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
SDPSX Cashflows
Over the 12 months to 2026-05, Invesco Short Duration Inflation Protected Fund had net outflows of $16.50M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-05 | $3.34M |
| 2026-04 | −$1.45M |
| 2026-03 | $5.98M |
| 2026-02 | −$2.49M |
| 2026-01 | −$6.70M |
| 2025-12 | $2.47M |
SDPSX Debt Constituents
Largest debt holdings of Invesco Short Duration Inflation Protected Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| U.S. Treasury Inflation - Indexed Bonds | 6.05% |
| U.S. Treasury Inflation - Indexed Bonds | 6.01% |
| U.S. Treasury Inflation - Indexed Bonds | 5.77% |
| U.S. Treasury Inflation - Indexed Bonds | 5.67% |
| U.S. Treasury Inflation - Indexed Notes | 5.67% |
| U.S. Treasury Inflation - Indexed Notes | 5.58% |
| U.S. Treasury Inflation - Indexed Notes | 5.51% |
| U.S. Treasury Inflation - Indexed Notes | 5.48% |
| U.S. Treasury Inflation - Indexed Notes | 5.46% |
| U.S. Treasury Inflation - Indexed Notes | 5.30% |
SDPSX Prospectus and SEC Filings
Official Invesco Short Duration Inflation Protected Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-06-25
- Prospectus (485BPOS) — filed 2025-06-26
- Prospectus (485BPOS) — filed 2024-06-28
- Portfolio holdings (N-PORT) — filed 2026-07-30
- Portfolio holdings (N-PORT) — filed 2026-04-29
- Portfolio holdings (N-PORT) — filed 2026-01-29
- Annual census (N-CEN) — filed 2026-05-13
- Annual census (N-CEN) — filed 2025-05-14
Related Funds
Other Short Treasury / Sovereign Bond 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.