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OSTRUM ASSET MANAGEMENT

SEC Form 13F institutional filer · CIK 0001767945

13F-HR · 450 reported holdings · 2026-03-31

Asset manager.

Reported long-US-equity value

$1.57B

Top-10 concentration

38.5%

OSTRUM ASSET MANAGEMENT — $1.57B AUM allocation strategy

OSTRUM ASSET MANAGEMENT files SEC Form 13F and reports $1.57B of long US equity value across 450 reported holdings for 2026-03-31.

Its largest sector bet is Information Technology 20.0%, followed by Industrials 8.9% and Financials 8.6%.

The top 10 holdings account for 39% 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.

OSTRUM ASSET MANAGEMENT — latest SEC 13F insights

Reported long-US-equity value (13F AUM)

$1.57B

total across 450 reported holdings · 2026-03-31 · excludes shorts, cash, non-US

Top-10 concentration

39% of value

higher = narrower conviction; lower = spread / hedging

Biggest adds (shares)

$SCHW$ROST$HON

+$SCHW +327K sh · +$30.6M+$ROST +129K sh · +$28.2M+$HON +126K sh · +$28.6M

Biggest trims (shares)

$ORLY$DIS$AVGO

−$ORLY −337K sh · −$30.7M−$DIS −239K sh · −$27.7M−$AVGO −214K sh · −$75.7M

Added from nil (new positions)

$BA$LITE$CASY

3 fresh holdings — new conviction

Exited to nil (held last quarter, gone now)

$SJM$BXP$BAX$BF.B$ARE

$SJM ($513K last qtr)$BXP ($193K last qtr)$BAX ($166K last qtr)$BF.B ($60.4K last qtr)$ARE ($42.3K last qtr)

Sector allocation (share of reported value)

Information Technology 20%Industrials 9%Financials 9%Communication Services 6%Consumer Discretionary 5%Health Care 4%Materials 4%Other holdings 43%SECTORS
  • $XLKInformation Technology20.0%—
  • $XLIIndustrials8.9%—
  • $XLFFinancials8.6%—
  • $XLCCommunication Services6.5%—
  • $XLYConsumer Discretionary5.4%—
  • $XLVHealth Care4.3%—
  • $XLBMaterials3.6%—
  • Other holdings42.8%—

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)

Semiconductors 7%Interactive Media & Services 6%Technology Hardware, Storage & Peripherals 5%Semiconductor Materials & Equipment 5%Pharmaceuticals 4%Broadline Retail 4%Construction Machinery & Heavy Transportation Equipment 2%Diversified Banks 2%Other holdings 64%INDUSTRIES
  • Semiconductors7.2%—
  • Interactive Media & Services6.5%—
  • Technology Hardware, Storage & Peripherals4.7%—
  • Semiconductor Materials & Equipment4.6%—
  • Pharmaceuticals4.3%—
  • Broadline Retail3.5%—
  • Construction Machinery & Heavy Transportation Equipment2.4%—
  • Diversified Banks2.3%—
  • Other holdings64.4%—

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 ↓

TickerHoldingSharesValueΔ QoQWeight
$NVDANVIDIA Corporation646K$113M+70.7K7.2%
$GOOGAlphabet Inc. Class C Capital Stock256K$73.7M-50.7K4.7%
$AAPLApple Inc289K$73.2M+29.4K4.7%
$AMATApplied Materials Inc212K$72.6M+22.8K4.6%
$LLYEli Lilly and Company74.1K$68.1M+6.09K4.3%
$AMZNAmazon.com Inc265K$55.2M-129K3.5%
$CMICummins Inc70.1K$37.7M+66.6K2.4%
$JPMJP Morgan Chase & Co126K$37.2M-26.8K2.4%
$GEGE Aerospace130K$37M+26.8K2.4%
$VVisa Inc120K$36.4M+79.7K2.3%

…and 440 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 IRWhich funds bought or dumped the stock, before the next call.
Quant / algo tradersCross-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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