Senior Debt Portfolio
Actively managed U.S. bond fund
As of its 2026 Q2 report, Senior Debt Portfolio held 636 positions with $4.65B in net assets. Its ten largest holdings made up 11.0% of the fund. Over the 12 months to May 2026, it returned 3.7%, with dividends reinvested. In 2026 Q3 it added 119 new positions and exited 148.
Senior Debt Portfolio is actively managed U.S. bond fund.
What you own
| Company | Weight | Value | Shares | Reported price |
|---|---|---|---|---|
MVRXXMorgan Stanley & Co. LLC | 3.29% | $152.84M | — | — |
EOC Borrower LLC 6.40% floating · due 2032-03-24 | 1.02% | $47.22M | — | — |
TK Elevator Midco GmbH 6.38% floating · due 2030-04-30 | 1.01% | $47.06M | — | — |
GUGGENHEIM PARTNERS LLC 6.20% floating · due 2031-11-26 | 0.98% | $45.50M | — | — |
Sedgwick Claims Management Services Inc 6.16% floating · due 2031-07-31 | 0.81% | $37.50M | — | — |
Eaton Vance Floating-Rate ETF | 0.81% | $37.52M | 772.5K | $48.58 |
TransDigm Inc 5.90% floating · due 2030-03-22 | 0.79% | $36.90M | — | — |
Alliant Holdings Intermediate, LLC 6.15% floating · due 2031-09-19 | 0.78% | $36.04M | — | — |
AI AQUA MERGER SUB INC 6.16% floating · due 2028-07-31 | 0.76% | $35.26M | — | — |
HUB International Limited 5.92% floating · due 2030-06-20 | 0.76% | $35.20M | — | — |
Reported price is the fund's own reported value divided by its own reported shares at 2026-04-30 — not a live quote, and not what the fund paid.
The 200 largest of 636 holdings, with the share counts as filed, open with a free account.
What the fund is made of
Percentages are of fund net assets. Rounding, liabilities and short positions can make totals differ from 100%.
| Loans | 114.72% |
| Bonds | 6.58% |
| Securitized | 3.89% |
| Cash & short-term | 3.36% |
| 3 smaller | 1.85% |
Look-through blends 4 underlying funds; 0.0% of NAV was not looked through and stays direct-classified.
How it has done
C000064522 share class · total returns with dividends reinvested
Volatility over the last 12 months: 2.07%. Past returns are a record, not a forecast.
Jun 2026 and Jul 2026 have been filed since the trailing figures were struck, so they are not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
Fees & fund details
Senior Debt Portfolio is an actively managed U.S. bond fund.
- Asset class
- Bonds
- Region
- United States
- Management
- Actively managed
- Fund type
- Open-end fund
- Credit quality
- High yield
- Rate sensitivity
- Short duration
- Features
- Master-feeder
This fund files no prospectus profile. Unit investment trusts and closed-end funds register on forms that carry no objective or fee tagging, and some fund families file without it — a gap in what was filed, not a fund without an objective or without fees.
Classified from what the fund holds, not from its name · 2026 Q2. The summary is a paraphrase of the prospectus; the objective is verbatim.
What changed this quarter
Positions that entered or left the fund since its previous filing. Positions that were only resized are not listed.
119 new· the largest 8
148 exited· the largest 8
Debt profile
What this fund holds — value-weighted across its bond and securitized long positions · as of 2026-04-30
Share of the fund's debt by how its coupon behaves — the fact that decides whether a rate move reaches this portfolio at all.
| Floating rate | 90.1% |
| Fixed rate | 5.5% |
| Zero-coupon or unclassified | 4.4% |
Share of the fund's debt value in each maturity band, shortest first.
| <1y | 0.1% |
| 1-3y | 16.6% |
| 3-5y | 30.6% |
| 5-10y | 51.2% |
| 10y+ | 1.5% |
These three overlap — one holding can be in arrears and paying in kind at once — so they are shown separately and never summed.
Risk profile
Interest-rate and credit-spread sensitivity, both in years · as of 2026Q2
Interest-rate moves barely touch this fund — but its credit exposure is real: a 100bp widening in credit spreads costs roughly 5.0%. Duration alone would have told you none of that.
Where the loss would come from. The two shocks are the same size, so this is the balance of the fund's two sensitivities rather than a bet on one moving more.
| Credit spreads | 96% |
| Interest rates | 4% |
Filers report the impact of a 0.01% move only, so the total is our own scaling of that one number and overstates the loss on most bonds — read it as approximate, never as precise. The two sensitivities overlap rather than add up: they measure the same positions against different shocks, which is why the durations above are shown side by side and never summed.
Share of the fund's spread duration carried by each credit tier.
| High yield | +4.92 yr |
| Investment grade | +0.17 yr |
Share of duration at each point, shortest first. This filer signs its rate and credit disclosures differently; the direction shown follows its interest-rate filing, and a negative reading is the least-supported figure here.
| 3 mo | 0.08 yr | 35% |
| 1 yr | 0.04 yr | 18% |
| 5 yr | 0.09 yr | 40% |
| 10 yr | 0.02 yr | 7% |
| 30 yr | 0.00 yr | 1% |
| 3 mo | 0.02 yr | 0% |
| 1 yr | 0.79 yr | 16% |
| 5 yr | 3.76 yr | 74% |
| 10 yr | 0.51 yr | 10% |
| 30 yr | 0.00 yr | 0% |
The two bands measure the same positions against different shocks and do not add — a Treasury carries rate duration and no spread duration, a floating-rate credit the reverse. Rate tenors are also summed across every currency the fund discloses.
Show the numbers
| Tenor | Rate yrs | IG yrs | HY yrs | IG $/bp | HY $/bp |
|---|---|---|---|---|---|
| 3 mo | +0.08 | +0.00 | +0.02 | $257 | $10.3k |
| 1 yr | +0.04 | +0.03 | +0.77 | $13.1k | $355.8k |
| 5 yr | +0.09 | +0.13 | +3.63 | $59.0k | $1.69m |
| 10 yr | +0.02 | +0.01 | +0.50 | $5.6k | $232.6k |
| 30 yr | +0.00 | +0.00 | +0.00 | $0 | $118 |
Dollar change per 1bp of spread movement, as filed and sign-anchored. A blank cell was not filed; a zero was.
Duration contribution in years, summing to the fund's 0.24 yr.
This is where the fund's rate exposure sits, not its currency risk — most international bond funds hedge the currency back to dollars, and the size of those hedges is not in the filing. Tenors are also summed across curves, so a 5-year JPY point and a 5-year USD point are added together.
A newer credit-spread reading (2026Q3) is on file. This page holds one quarter across every figure on it, so that one appears here next quarter.
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