FMSFX — Fidelity Advisor Mortgage Securities Fund
Data updated: 2026-07-24
FMSFX — Fidelity Advisor Mortgage Securities Fund. Long Securitized (MBS/ABS/CMBS) Bond · $766.76M AUM. Holdings, fees, performance and SEC filings.
FMSFX Fund Overview
FMSFX — Fidelity Advisor Mortgage Securities Fund is a US mutual fund managed by Fidelity Advisor Series II, categorised as Long Securitized (MBS/ABS/CMBS) Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Fidelity Advisor Series II
- Category: Long Securitized (MBS/ABS/CMBS) Bond
- Assets under management: $766.76M
- 1-year return: 6.8%
- Ticker: FMSFX
- SEC CIK: 0000795422
- SEC series ID: S000005133
- Share class ID: C000014129
FMSFX Holdings
Top 10 holdings of Fidelity Advisor Mortgage Securities Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Fnma/fhlg Tba Issuer | 8.58% |
| Gnma Ii Gtd Pass Thru Ctf Multiple Issuer | 7.11% |
| Fnma/fhlg Tba Issuer | 6.44% |
| Gnma Ii Gtd Pass Thru Ctf Multiple Issuer | 4.73% |
| Fidelity Revere Street Trust | 3.46% |
| Gnma Ii Gtd Pass Thru Ctf Multiple Issuer | 2.97% |
| Gnma Ii Gtd Pass Thru Ctf Multiple Issuer | 2.96% |
| Fnma/fhlg Tba Issuer | 2.19% |
| Gnma Ii Gtd Pass Thru Ctf Multiple Issuer | 1.96% |
| Fed Home Loan Mtg Corp. - Gold | 1.54% |
FMSFX Portfolio Allocation
Asset-class allocation of Fidelity Advisor Mortgage Securities Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Securitized | 138.8% |
| Fixed Income | 4.9% |
| Cash & Equivalents | 3.5% |
| Real Estate | 0.3% |
| Derivatives | 0.1% |
FMSFX Performance
Total returns for FMSFX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.1% |
| 1 year | 6.8% |
| 3 years (annualised) | 4.3% |
| 5 years (annualised) | 0.3% |
FMSFX Risk Information
Risk metrics for FMSFX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.2%
FMSFX Costs and Fees
FMSFX costs about $45 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.45%
- Gross expense ratio: 0.45%
- Portfolio turnover: 652%
- Brokerage commissions: 0.32 bps of average net assets (SEC N-CEN)
FMSFX Cashflows
Over the 12 months to 2026-05, Fidelity Advisor Mortgage Securities Fund had net inflows of $140.82M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-05 | −$2.83M |
| 2026-04 | $16.01M |
| 2026-03 | $23.27M |
| 2026-02 | $6.98M |
| 2026-01 | $18.41M |
| 2025-12 | $12.82M |
FMSFX Debt Constituents
Largest debt holdings of Fidelity Advisor Mortgage Securities Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Ust Notes | 1.26% |
| United States Treasury Bond | 1.05% |
| Ust Notes | 0.79% |
| Ust Notes | 0.31% |
| Ust Notes | 0.29% |
| United States Treasury Bond | 0.28% |
| Ust Notes | 0.25% |
| Ust Notes | 0.25% |
| United States Treasury Bond | 0.12% |
| United States Treasury Bond | 0.11% |
FMSFX Prospectus and SEC Filings
Official Fidelity Advisor Mortgage Securities Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2025-10-27
- Prospectus (485BPOS) — filed 2024-10-25
- Prospectus supplement (497) — filed 2024-03-01
- Portfolio holdings (N-PORT) — filed 2026-07-24
- Portfolio holdings (N-PORT) — filed 2026-04-24
- Portfolio holdings (N-PORT) — filed 2026-01-23
- Annual census (N-CEN) — filed 2025-11-12
- Annual census (N-CEN) — filed 2024-11-13
Related Funds
Other Long Securitized (MBS/ABS/CMBS) 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.