BAMCO INC /NY/
SEC Form 13F institutional filer · CIK 0001017918
13F-HR · 113 reported holdings · 2026-03-31
BAMCO Inc /NY/ is an asset manager.
Reported long-US-equity value
$17.59B
Top-10 concentration
71.1%
BAMCO INC /NY/ — $17.6B AUM allocation strategy
BAMCO INC /NY/ files SEC Form 13F and reports $17.6B of long US equity value across 113 reported holdings for 2026-03-31.
Its largest sector bet is Consumer Discretionary 28.8%, followed by Financials 27.5% and Information Technology 9.4%.
The top 10 holdings account for 71% 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.
BAMCO INC /NY/ — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$17.6B
total across 113 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
71% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$IT +1.7M sh · −$126M+$VRSK +1.21M sh · +$185M+$FDS +868K sh · −$23.2M
Biggest trims (shares)
−$CSGP −3.18M sh · −$653M−$ACGL −1.28M sh · −$121M−$BX −918K sh · −$86.8M
Exited to nil (held last quarter, gone now)
$TTD ($19M last qtr)$DHR ($13.9M last qtr)$BXP ($13.7M last qtr)$BSX ($4.48M last qtr)$MCK ($4.1M 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)
- Automobile Manufacturers25.2%—
- Financial Exchanges & Data12.9%—
- Property & Casualty Insurance9.2%—
- Investment Banking & Brokerage5.5%—
- IT Consulting & Other Services5.3%—
- Health Care Equipment5.2%—
- Real Estate Services3.8%—
- Semiconductors2.9%—
- Other holdings30.0%—
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 |
|---|---|---|---|---|---|
| $TSLA | Tesla Inc | 11.9M | $4.44B | +6.03K | 25.2% |
| $ACGL | Arch Capital Group Ltd | 16.7M | $1.6B | -1.28M | 9.1% |
| $MSCI | MSCI Inc | 2.7M | $1.45B | -56.4K | 8.3% |
| $IT | Gartner Inc | 5.92M | $937M | +1.7M | 5.3% |
| $IDXX | IDEXX Laboratories Inc | 1.63M | $918M | -165K | 5.2% |
| $FDS | FactSet Research Systems Inc | 3.76M | $815M | +868K | 4.6% |
| $SCHW | Charles Schwab Corporation | 7.46M | $701M | +404K | 4.0% |
| $CSGP | CoStar Group Inc | 16.3M | $658M | -3.18M | 3.7% |
| $NVDA | NVIDIA Corporation | 2.92M | $509M | -69.2K | 2.9% |
| $VRSK | Verisk Analytics Inc | 2.51M | $477M | +1.21M | 2.7% |
…and 103 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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