MPLX Lp bonds MPLX
Who owns MPLX Lp's debt and what their own filings say it is worth. Bond prices and yields are fund-reported marks (SEC Form N-PORT) as of Jul 2026; they lag the market by about two months. MPLX stock page.
Every bond funds hold
Each bond's latest fund-reported mark. Price per 100 of face value; yield to maturity from price, coupon and maturity; spread over the matched-maturity Treasury for US-dollar bonds.
| Bond | Coupon | Maturity | Ccy | Price | Yield | Spread | Funds | Held | As of |
|---|---|---|---|---|---|---|---|---|---|
| 55336VAK6 | 4.125% fixed | 2027-03-01 | USD | 99.83 | 4.41% | 54 bp | 13 | $41.9M | Jul 2026 |
| 55336VBN9 | 4.25% fixed | 2027-12-01 | USD | 99.51 | 4.63% | 52 bp | 11 | $22.2M | Jul 2026 |
| 55336VAR1 | 4% fixed | 2028-03-15 | USD | 98.88 | 4.72% | 56 bp | 24 | $62.4M | Jul 2026 |
| 55336VAS9 | 4.8% fixed | 2029-02-15 | USD | 99.91 | 4.84% | 59 bp | 14 | $18.0M | Jul 2026 |
| 55336VBQ2 | 2.65% fixed | 2030-08-15 | USD | 91.44 | 5.02% | 72 bp | 22 | $41.4M | Jul 2026 |
| 55336VCA6 | 4.8% fixed | 2031-02-15 | USD | 98.72 | 5.12% | 80 bp | 33 | $71.0M | Jul 2026 |
| 55336VBU3 | 4.95% fixed | 2032-09-01 | USD | 98.32 | 5.27% | 87 bp | 17 | $19.6M | Jul 2026 |
| 55336VCB4 | 5% fixed | 2033-01-15 | USD | 97.91 | 5.39% | 96 bp | 21 | $78.4M | Jul 2026 |
| 55336VBV1 | 5% fixed | 2033-03-01 | USD | 97.83 | 5.40% | 96 bp | 18 | $19.6M | Jul 2026 |
| 55336VBX7 | 5.5% fixed | 2034-06-01 | USD | 99.61 | 5.56% | 106 bp | 22 | $44.8M | Jul 2026 |
| 55336VBY5 | 5.4% fixed | 2035-04-01 | USD | 98.24 | 5.66% | 112 bp | 11 | $21.7M | Jul 2026 |
| 55336VCC2 | 5.4% fixed | 2035-09-15 | USD | 98.03 | 5.68% | 112 bp | 25 | $75.9M | Jul 2026 |
| 55336VCE8 | 5.3% fixed | 2036-04-01 | USD | 96.79 | 5.74% | 115 bp | 20 | $45.4M | Jul 2026 |
| 55336VAM2 | 4.5% fixed | 2038-04-15 | USD | 88.53 | 5.87% | 118 bp | 21 | $42.2M | Jul 2026 |
| 55336VAL4 | 5.2% fixed | 2047-03-01 | USD | 86.29 | 6.41% | 130 bp | 11 | $4.6M | Jul 2026 |
| 55336VBP4 | 5.2% fixed | 2047-12-01 | USD | 86.02 | 6.41% | 130 bp | 9 | $6.5M | Jul 2026 |
| 55336VAN0 | 4.7% fixed | 2048-04-15 | USD | 79.84 | 6.44% | 133 bp | 6 | $3.2M | Jul 2026 |
| 55336VAT7 | 5.5% fixed | 2049-02-15 | USD | 88.44 | 6.48% | 138 bp | 9 | $6.0M | Jul 2026 |
| 55336VBT6 | 4.95% fixed | 2052-03-14 | USD | 80.92 | 6.49% | 138 bp | 14 | $33.1M | Jul 2026 |
| 55336VBW9 | 5.65% fixed | 2053-03-01 | USD | 89.40 | 6.49% | 139 bp | 7 | $3.2M | Jul 2026 |
| 55336VBZ2 | 5.95% fixed | 2055-04-01 | USD | 92.88 | 6.50% | 140 bp | 7 | $3.0M | Jul 2026 |
| 55336VCD0 | 6.2% fixed | 2055-09-15 | USD | 95.88 | 6.52% | 142 bp | 11 | $5.9M | Jul 2026 |
| 55336VCF5 | 6.1% fixed | 2056-04-01 | USD | 94.82 | 6.50% | 140 bp | 11 | $13.3M | Jul 2026 |
| 55336VAP5 | 4.9% fixed | 2058-04-15 | USD | 78.99 | 6.47% | 137 bp | 5 | $727K | Jul 2026 |
Spread history
Median spread of the US-dollar bonds over Treasuries, month-ends with complete filings. Fund-reported.
Price history
Median fund-marked price across the bonds, per 100 of face value.
By month
Funds file on staggered quarter-ends, so each month-end is marked by the funds that reported for it; the amount held moves with which funds filed, not only with buying and selling.
| Month-end | Bonds | Held | Median price | USD yield | USD spread | Most funds on one bond |
|---|---|---|---|---|---|---|
| Aug 2026 partial: filings still arriving | 1 | $7.8M | 97.97 | 5.69% | 106 bp | 1 |
| Jul 2026 | 24 | $684.1M | 96.33 | 5.71% | 114 bp | 33 |
| Jun 2026 | 24 | $2.11B | 98.99 | 5.46% | 102 bp | 58 |
| May 2026 | 24 | $1.48B | 99.32 | 5.41% | 96 bp | 34 |
| Apr 2026 | 24 | $684.6M | 98.44 | 5.47% | 118 bp | 35 |
| Mar 2026 | 24 | $2.16B | 98.62 | 5.46% | 124 bp | 58 |
| Feb 2026 | 25 | $1.66B | 100.08 | 5.10% | 102 bp | 37 |
| Jan 2026 | 23 | $733.2M | 99.95 | 5.25% | 110 bp | 40 |
| Dec 2025 | 23 | $2.21B | 99.61 | 5.30% | 118 bp | 69 |
| Nov 2025 | 23 | $1.67B | 99.72 | 5.21% | 116 bp | 36 |
| Oct 2025 | 23 | $725.9M | 99.53 | 5.30% | 128 bp | 41 |
| Sep 2025 | 23 | $2.14B | 99.50 | 5.29% | 121 bp | 68 |
| Aug 2025 | 23 | $1.65B | 98.66 | 5.44% | 125 bp | 37 |
Who holds the debt
Fund series in their latest quarterly N-PORT report, largest first, with the change in face value against each fund's own previous report. Names as reported in the filings. 103 added, 146 cut, 12 new holders and 32 exits in the latest quarter.
| Fund series | Report | Face value | Value | Change in face value |
|---|---|---|---|---|
| VANGUARD TOTAL BOND MARKET II INDEX FUND VANGUARD BOND INDEX FUNDS | 2026-06-30 | $267.8M | $258.0M | -$10.5M |
| VANGUARD TOTAL BOND MARKET INDEX FUND VANGUARD BOND INDEX FUNDS | 2026-06-30 | $255.9M | $245.4M | -$2.3M |
| VANGUARD INTERMEDIATE-TERM CORPORATE BOND INDEX FUND VANGUARD SCOTTSDALE FUNDS | 2026-05-31 | $228.1M | $228.4M | $14.3M |
| iShares iBoxx $ Investment Grade Corporate Bond ETF iShares Trust | 2026-05-31 | $145.1M | $138.0M | -$25.7M |
| PGIM Total Return Bond Fund Prudential Investment Portfolios, Inc. 17 | 2026-07-31 | $127.7M | $122.9M | $0 |
| iShares Core U.S. Aggregate Bond ETF iShares Trust | 2026-05-31 | $109.3M | $103.6M | -$5.8M |
| Baird Aggregate Bond Fund Baird Funds Inc | 2026-06-30 | $99.0M | $97.8M | $0 |
| AST Multi-Sector Fixed Income Portfolio Advanced Series Trust | 2026-06-30 | $104.5M | $93.5M | $400K |
| VANGUARD SHORT-TERM CORPORATE BOND INDEX FUND VANGUARD SCOTTSDALE FUNDS | 2026-05-31 | $88.6M | $86.3M | -$11.5M |
| VANGUARD INTERMEDIATE-TERM INVESTMENT-GRADE FUND VANGUARD FIXED INCOME SECURITIES FUNDS | 2026-07-31 | $85.0M | $82.9M | $0 |
| PIMCO Long Duration Credit Bond Portfolio PIMCO FUNDS | 2026-06-30 | $93.5M | $81.5M | -$500K |
| VANGUARD INTERMEDIATE-TERM BOND INDEX FUND VANGUARD BOND INDEX FUNDS | 2026-06-30 | $76.5M | $76.3M | $360K |
| Guggenheim Total Return Bond Fund Guggenheim Funds Trust | 2026-06-30 | $72.0M | $71.0M | $0 |
| Fidelity Series Investment Grade Bond Fund Fidelity Salem Street Trust | 2026-05-31 | $64.3M | $62.1M | $0 |
| Fidelity U.S. Bond Index Fund Fidelity Salem Street Trust | 2026-05-31 | $63.7M | $60.2M | $0 |
| Fidelity Investment Grade Bond Central Fund Fidelity Central Investment Portfolios II LLC | 2026-06-30 | $61.4M | $59.3M | $0 |
| iShares 5-10 Year Investment Grade Corporate Bond ETF iShares Trust | 2026-05-31 | $55.2M | $55.3M | $1.9M |
| AST Investment Grade Bond Portfolio Advanced Series Trust | 2026-06-30 | $53.2M | $52.9M | -$1.1M |
| Baird Core Plus Bond Fund Baird Funds Inc | 2026-06-30 | $49.6M | $47.9M | $0 |
| Fidelity Total Bond ETF Fidelity Merrimack Street Trust | 2026-05-31 | $50.4M | $47.8M | $0 |
| iShares Broad USD Investment Grade Corporate Bond ETF iShares Trust | 2026-05-31 | $47.9M | $45.6M | -$45K |
| Aristotle Strategic Income Fund Aristotle Fund Series Trust | 2026-06-30 | $46.0M | $45.4M | $0 |
| Bridge Builder Core Bond Fund Bridge Builder Trust | 2026-06-30 | $45.0M | $43.7M | -$350K |
| VANGUARD SHORT-TERM INVESTMENT-GRADE FUND VANGUARD FIXED INCOME SECURITIES FUNDS | 2026-07-31 | $42.1M | $41.6M | -$2.8M |
| Schwab 5-10 Year Corporate Bond ETF SCHWAB STRATEGIC TRUST | 2026-06-30 | $41.6M | $41.5M | $8.0M |
Largest exits in the latest quarter (fund held the bonds in its previous report, none now): T. Rowe Price Short-Term Bond Fund, Inc. ($15.7M), Invesco BulletShares 2026 Corporate Bond ETF ($15.5M), JPMorgan Managed Income Fund ($15.4M), Guggenheim Limited Duration Fund ($14.0M), First Trust Smith Opportunistic Fixed Income ETF ($6.7M), ALPS | Smith Total Return Bond Fund ($6.4M), Goldman Sachs Short-Term Conservative Income Fund ($5.0M), Short Duration Bond Portfolio ($4.4M), ALPS | Smith Core Plus Bond ETF ($3.9M), JNL/T. Rowe Price Short-Term Bond Fund ($3.6M).
ETFs holding these bonds
From each ETF's own latest N-PORT report: the issuer's bonds as a share of the ETF's net assets. A holdings list, not a recommendation.
| ETF | Report | Bonds | Face value | Value | % of net assets |
|---|---|---|---|---|---|
| BND VANGUARD TOTAL BOND MARKET INDEX FUND | 2026-06-30 | 18 | $255.9M | $245.4M | 0.06% |
| VCIT VANGUARD INTERMEDIATE-TERM CORPORATE BOND INDEX FUND | 2026-05-31 | 7 | $228.1M | $228.4M | 0.33% |
| LQD iShares iBoxx $ Investment Grade Corporate Bond ETF | 2026-05-31 | 16 | $145.1M | $138.0M | 0.46% |
| AGG iShares Core U.S. Aggregate Bond ETF | 2026-05-31 | 23 | $109.3M | $103.6M | 0.08% |
| VCSH VANGUARD SHORT-TERM CORPORATE BOND INDEX FUND | 2026-05-31 | 5 | $88.6M | $86.3M | 0.17% |
| BIV VANGUARD INTERMEDIATE-TERM BOND INDEX FUND | 2026-06-30 | 6 | $76.5M | $76.3M | 0.15% |
| IGIB iShares 5-10 Year Investment Grade Corporate Bond ETF | 2026-05-31 | 7 | $55.2M | $55.3M | 0.30% |
| FBND Fidelity Total Bond ETF | 2026-05-31 | 5 | $50.4M | $47.8M | 0.18% |
| USIG iShares Broad USD Investment Grade Corporate Bond ETF | 2026-05-31 | 23 | $47.9M | $45.6M | 0.26% |
| SCHI Schwab 5-10 Year Corporate Bond ETF | 2026-06-30 | 7 | $41.6M | $41.5M | 0.36% |
| VCLT VANGUARD LONG-TERM CORPORATE BOND INDEX FUND | 2026-05-31 | 10 | $38.1M | $35.1M | 0.38% |
| IGSB iShares 1-5 Year Investment Grade Corporate Bond ETF | 2026-05-31 | 5 | $30.5M | $29.8M | 0.14% |
| SPIB State Street(R) SPDR(R) Portfolio Intermediate Term Corporate Bond ETF | 2026-06-30 | 12 | $27.3M | $27.2M | 0.23% |
| IUSB iShares Core Universal USD Bond ETF | 2026-07-31 | 23 | $29.2M | $27.1M | 0.06% |
| BSV VANGUARD SHORT-TERM BOND INDEX FUND | 2026-06-30 | 5 | $27.0M | $26.8M | 0.04% |
Default risk, three ways
Stock market: distance-to-default
Distance-to-default 12.14: safer than 87% of companies (92th percentile in Energy). Market-implied, prices to 2026-10-16, balance sheet 2026-06-30.
| Equity value | $58.96B |
| Debt barrier (short-term + ½ long-term debt) | $13.45B |
| Equity volatility (1 year) | 17.2% |
| Asset value / asset volatility (solved) | $71.84B / 14.1% |
| Risk-free rate (1-year Treasury) | 4.28% |
Bond market: priced-in odds
A 114 bp spread prices in about 1.9% a year of default odds (spread ÷ (1 − 40% recovery)). Fund-reported marks as of Jul 2026; the spread also pays for liquidity and risk premium, so this overstates actual defaults.
Accounts: Altman Z
Altman Z'' = 1.38 (latest balance sheet). A fundamentals cross-check; see methods for the variant used.
The stock side: 13F filings
What institutions report holding in MPLX's stock and options. Options are reported at the value of the underlying shares, not the premium paid; 13F lists long positions only, lags 45 days after quarter-end, and does not show whether puts hedge a stock position.
| Quarter-end | Stock holders | Stock value | Put managers | Puts (underlying value) | Call managers | Calls (underlying value) | Convertible holders |
|---|---|---|---|---|---|---|---|
| 2026-09-30 filings still arriving | 86 | $153.1M | 0 | — | 0 | — | 0 |
| 2026-06-30 | 625 | $9.93B | 9 | $73.2M | 8 | $230.1M | 0 |
| 2026-03-31 | 628 | $9.27B | 8 | $48.7M | 8 | $230.8M | 0 |
| 2025-12-31 | 616 | $7.35B | 9 | $72.7M | 10 | $218.2M | 0 |
| 2025-09-30 | 559 | $9.58B | 10 | $90.6M | 9 | $123.0M | 0 |
| 2025-06-30 | 563 | $10.68B | 14 | $68.8M | 9 | $153.7M | 0 |
Sources: fund holdings and fund-reported marks from SEC Form N-PORT (published about 60 days after each month-end); 13F filings; House and Senate periodic transaction reports and OGE Form 278-T; Treasury yields from FRED. Findings from filings, not advice. How each number is computed.