MARINER INVESTMENT GROUP LLC
SEC Form 13F institutional filer · CIK 0001096978
13F-HR · 9 reported holdings · 2026-03-31
Reported long-US-equity value
$0.02B
Top-10 concentration
100.0%
MARINER INVESTMENT GROUP LLC — $18.4M AUM allocation strategy
MARINER INVESTMENT GROUP LLC files SEC Form 13F and reports $18.4M of long US equity value across 9 reported holdings for 2026-03-31.
Its largest sector bet is Utilities 27.1%, followed by Energy 24.7% and Industrials 14.6%.
The top 10 holdings account for 100% of reported value — a conviction-weighted book concentrated in its best ideas. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.
MARINER INVESTMENT GROUP LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$18.4M
total across 9 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
100% of value
higher = narrower conviction; lower = spread / hedging
Exited to nil (held last quarter, gone now)
$MSFT ($166M last qtr)$LRCX ($126M last qtr)$GOOGL ($110M last qtr)$COST ($108M last qtr)$CSCO ($106M last qtr)
Sector allocation (share of reported value)
each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Industry allocation (share of reported value)
- Electric Utilities24.4%—
- Oil & Gas Storage & Transportation17.8%—
- Construction Machinery & Heavy Transportation Equipment14.6%—
- Oil & Gas Exploration & Production6.9%—
- Consumer Staples Merchandise Retail4.9%—
- Semiconductors4.6%—
- Independent Power Producers & Energy Traders2.7%—
- Paper & Plastic Packaging Products & Materials1.7%—
- Other holdings22.4%—
the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Top S&P 500 holdings
8 of 8 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $ETR | Entergy Corporation | 40K | $4.49M | -5K | 24.4% |
| $WMB | Williams Companies Inc | 45K | $3.28M | +0 | 17.8% |
| $CAT | Caterpillar Inc | 3.8K | $2.69M | — | 14.6% |
| $EQT | EQT Corporation | 20K | $1.27M | +0 | 6.9% |
| $WMT | Walmart Inc | 7.26K | $903K | — | 4.9% |
| $MCHP | Microchip Technology Incorporated | 13K | $840K | — | 4.6% |
| $AES | The AES Corporation | 35K | $493K | — | 2.7% |
| $PKG | Packaging Corporation of America | 1.5K | $318K | — | 1.7% |
…and 1 more holdings in the full 13F filing (top positions only shown).
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
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How to read Δ QoQ — the five insight categories, and the caveats
The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.
Conviction & concentration shifts
New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.
Sector & macro allocation rotations
Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.
Crowding & smart-money consensus
When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.
Derivative & option overlays
Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.
Who reads this
| Retail "cloners" | High-conviction ideas to replicate ~45 days after quarter-end. |
| Corporate IR | Which funds bought or dumped the stock, before the next call. |
| Quant / algo traders | Cross-sectional factor inputs: flow, momentum, ownership. |
Four caveats before you trade on it
- 45-day lag — holdings are quarter-end; positions may already be closed.
- Long-only — 13Fs miss shorts, pair trades and cash.
- No non-US / fixed income — the picture is US equities plus options.
- Corporate actions — splits and spinoffs distort raw share deltas.
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