PGSBX — Putnam Mortgage Securities Fund
Data updated: 2026-08-27
PGSBX — Putnam Mortgage Securities Fund. Long Securitized (MBS/ABS/CMBS) Bond · $373.72M AUM. Holdings, fees, performance and SEC filings.
PGSBX Fund Overview
PGSBX — Putnam Mortgage Securities Fund is a US mutual fund managed by Putnam Mortgage Securities Fund, 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: Putnam Mortgage Securities Fund
- Category: Long Securitized (MBS/ABS/CMBS) Bond
- Assets under management: $373.72M
- 1-year return: 12.9%
- Ticker: PGSBX
- SEC CIK: 0000732337
- SEC series ID: S000006570
- Share class ID: C000017923
PGSBX Holdings
Top 10 holdings of Putnam Mortgage Securities Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| FNMA or FHLMC | 32.44% |
| FNMA or FHLMC | 19.63% |
| FNMA or FHLMC | 19.08% |
| FNMA or FHLMC | 15.81% |
| FNMA or FHLMC | 14.18% |
| Putnam Short Term Investment Fund | 10.19% |
| FNMA or FHLMC | 9.61% |
| FNMA or FHLMC | 8.32% |
| FNMA or FHLMC | 6.06% |
| FNMA or FHLMC | 5.82% |
PGSBX Portfolio Allocation
Asset-class allocation of Putnam Mortgage Securities Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Securitized | 252.6% |
| Other | 10.2% |
| Cash & Equivalents | 3.4% |
| Real Estate | 2.7% |
PGSBX Performance
Total returns for PGSBX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| 1 year | 12.9% |
| 3 years (annualised) | -2.6% |
| 5 years (annualised) | -1.6% |
PGSBX Risk Information
Risk metrics for PGSBX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 7.8%
PGSBX Costs and Fees
PGSBX costs about $172 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.72%
- Gross expense ratio: 1.72%
- Portfolio turnover: 1013%
- Brokerage commissions: 0.27 bps of average net assets (SEC N-CEN)
PGSBX Cashflows
Over the 12 months to 2026-06, Putnam Mortgage Securities Fund had net outflows of $53.84M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$3.70M |
| 2026-05 | −$5.04M |
| 2026-04 | −$7.74M |
| 2026-03 | −$212.04K |
| 2026-02 | −$2.18M |
| 2026-01 | −$2.62M |
PGSBX Debt Constituents
Largest debt holdings of Putnam Mortgage Securities Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States of America | 0.05% |
PGSBX Prospectus and SEC Filings
Official Putnam Mortgage Securities Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-01-27
- Prospectus (485BPOS) — filed 2025-01-28
- Prospectus (485BPOS) — filed 2024-01-25
- Portfolio holdings (N-PORT) — filed 2026-08-27
- Portfolio holdings (N-PORT) — filed 2026-05-27
- Portfolio holdings (N-PORT) — filed 2026-02-25
- Annual census (N-CEN) — filed 2025-12-12
- Annual census (N-CEN) — filed 2024-12-12
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.