SRB CORP
SEC Form 13F institutional filer · CIK 0001496228
13F-HR · 19 reported holdings · 2026-03-31
SRB CORP is a holding company.
Reported long-US-equity value
$1.29B
Top-10 concentration
77.9%
SRB CORP — $1.29B AUM allocation strategy
SRB CORP files SEC Form 13F and reports $1.29B of long US equity value across 19 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 23.8%, followed by Industrials 12.2% and Consumer Staples 8.6%.
The top 10 holdings account for 78% 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.
SRB CORP — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$1.29B
total across 19 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
78% of value
higher = narrower conviction; lower = spread / hedging
Biggest trims (shares)
−$MSFT −117K sh · −$122M−$WMT −106K sh · −$3.88M−$GE −69K sh · −$28.5M
Added from nil (new positions)
None this quarter
Exited to nil (held last quarter, gone now)
None this quarter
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)
- Systems Software16.5%—
- Semiconductors7.3%—
- Broadline Retail7.3%—
- Aerospace & Defense6.6%—
- Consumer Staples Merchandise Retail6.0%—
- Industrial Machinery & Supplies & Components5.6%—
- Interactive Media & Services5.1%—
- Pharmaceuticals4.3%—
- Other holdings41.3%—
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
6 of 6 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $MSFT | Microsoft Corporation | 576K | $213M | -117K | 16.5% |
| $INTC | Intel Corporation | 2.15M | $94.7M | -38.7K | 7.3% |
| $AMZN | Amazon.com Inc | 450K | $93.8M | -10K | 7.3% |
| $GE | GE Aerospace | 301K | $85.4M | -69K | 6.6% |
| $WMT | Walmart Inc | 621K | $77.1M | -106K | 6.0% |
| $GWW | W.W. Grainger Inc | 66.9K | $72.9M | -1.34K | 5.6% |
…and 13 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.
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