MATTERN CAPITAL MANAGEMENT, LLC
SEC Form 13F institutional filer · CIK 0001803227
13F-HR · 123 reported holdings · 2026-03-31
SEC-registered institutional investment manager.
Reported long-US-equity value
$0.77B
Top-10 concentration
18.4%
MATTERN CAPITAL MANAGEMENT, LLC — $771M AUM allocation strategy
MATTERN CAPITAL MANAGEMENT, LLC files SEC Form 13F and reports $771M of long US equity value across 123 reported holdings for 2026-03-31.
Its largest sector bet is Utilities 7.8%, followed by Information Technology 6.0% and Industrials 4.7%.
The top 10 holdings account for 18% of reported value — a broadly spread portfolio. 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.
MATTERN CAPITAL MANAGEMENT, LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$771M
total across 123 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
18% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$CMS +39K sh · +$3.95M+$WM +37.5K sh · +$8.68M+$ABT +34.7K sh · +$1.95M
Biggest trims (shares)
−$TGT −86.7K sh · −$8.44M−$EMR −76K sh · −$10.1M−$WMT −55K sh · −$4.99M
Exited to nil (held last quarter, gone now)
$APD ($8.57M last qtr)$BF.B ($6.92M last qtr)$ADBE ($1.66M last qtr)$BAX ($1.32M last qtr)$AZO ($841K 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)
- Consumer Staples Merchandise Retail3.3%—
- Multi-Utilities3.2%—
- Aerospace & Defense3.0%—
- Technology Hardware, Storage & Peripherals2.6%—
- Oil & Gas Refining & Marketing2.1%—
- Systems Software2.0%—
- Health Care Distributors1.7%—
- Industrial Machinery & Supplies & Components1.7%—
- Other holdings80.4%—
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
10 of 10 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $AAPL | Apple Inc | 77.6K | $19.7M | +867 | 2.6% |
| $PSX | Phillips 66 | 88.6K | $16.1M | -1.85K | 2.1% |
| $MSFT | Microsoft Corporation | 41.3K | $15.3M | +5.72K | 2.0% |
| $COST | Costco Wholesale Corporation | 14.4K | $14.4M | -171 | 1.9% |
| $COR | Cencora Inc | 42K | $13.2M | -566 | 1.7% |
| $GWW | W.W. Grainger Inc | 12K | $13.1M | -226 | 1.7% |
| $WEC | WEC Energy Group Inc | 110K | $12.7M | +24.8K | 1.7% |
| $NEE | NextEra Energy Inc | 134K | $12.4M | -3.15K | 1.6% |
| $CMS | CMS Energy Corporation | 160K | $12.4M | +39K | 1.6% |
| $LOW | Lowe's Companies Inc | 52K | $12.3M | -1.33K | 1.6% |
…and 113 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
← All 13F filers·← QuantOrb.pro
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.
Newsletter signup
Free subscription. Daily trading day morning dispatch. No spam.