Boston Partners
SEC Form 13F institutional filer · CIK 0001386060
13F-HR · 227 reported holdings · 2026-03-31
Asset management firm, subsidiary of Boston Partners.
Reported long-US-equity value
$67.51B
Top-10 concentration
18.5%
Boston Partners — $67.5B AUM allocation strategy
Boston Partners files SEC Form 13F and reports $67.5B of long US equity value across 227 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 6.6%, followed by Energy 5.1% and Health Care 4.7%.
The top 10 holdings account for 19% 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.
Boston Partners — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$67.5B
total across 227 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
19% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$SLB +5.03M sh · +$365M+$NVDA +1.67M sh · +$292M+$V +1.43M sh · +$412M
Biggest trims (shares)
−$HBAN −8.72M sh · −$237M−$MDT −4.71M sh · −$471M−$CNC −4.13M sh · −$173M
Exited to nil (held last quarter, gone now)
$LULU ($305M last qtr)$EMR ($245M last qtr)$DVA ($6.76M last qtr)$AOS ($5.19M last qtr)$O ($1.54M 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)
- Diversified Banks4.3%—
- Health Care Distributors3.6%—
- Oil & Gas Exploration & Production3.0%—
- Semiconductors2.8%—
- Soft Drinks & Non-alcoholic Beverages2.2%—
- Oil & Gas Refining & Marketing2.0%—
- Broadline Retail1.7%—
- Tobacco1.4%—
- Other holdings79.0%—
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 |
|---|---|---|---|---|---|
| $JPM | JP Morgan Chase & Co | 7.05M | $2.08B | -179K | 3.1% |
| $KO | Coca-Cola Company | 15.3M | $1.5B | -2.11M | 2.2% |
| $COR | Cencora Inc | 4.48M | $1.41B | +286K | 2.1% |
| $MPC | Marathon Petroleum Corporation | 5.65M | $1.38B | -471K | 2.0% |
| $FANG | Diamondback Energy Inc | 5.77M | $1.14B | +190K | 1.7% |
| $AMZN | Amazon.com Inc | 5.45M | $1.14B | +493K | 1.7% |
| $MCK | McKesson Corporation | 1.16M | $1B | -74.7K | 1.5% |
| $MCHP | Microchip Technology Incorporated | 14.7M | $953M | -461K | 1.4% |
| $PM | Philip Morris International Inc | 5.78M | $953M | -543K | 1.4% |
| $MU | Micron Technology Inc | 2.8M | $951M | -727K | 1.4% |
…and 217 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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