OBERWEIS ASSET MANAGEMENT INC/
SEC Form 13F institutional filer · CIK 0000937886
13F-HR · 27 reported holdings · 2026-03-31
Reported long-US-equity value
$0.29B
Top-10 concentration
98.2%
OBERWEIS ASSET MANAGEMENT INC/ — $294M AUM allocation strategy
OBERWEIS ASSET MANAGEMENT INC/ files SEC Form 13F and reports $294M of long US equity value across 27 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 64.3%, followed by Financials 26.7% and Consumer Discretionary 6.9%.
The top 10 holdings account for 98% 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.
OBERWEIS ASSET MANAGEMENT INC/ — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$294M
total across 27 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
98% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$KKR +251K sh · +$15.4M+$AIZ +19.3K sh · +$2.29M+$SPY +319 sh · +$143K
Biggest trims (shares)
−$LITE −14.7K sh · +$83.5M−$MU −3.8K sh · −$1.05M−$WMT −50 sh · +$22K
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)
- Communications Equipment63.7%—
- Asset Management & Custody Banks18.5%—
- Multi-line Insurance7.6%—
- Homebuilding6.9%—
- Interactive Media & Services0.3%—
- Systems Software0.3%—
- Diversified Banks0.3%—
- Technology Hardware, Storage & Peripherals0.3%—
- Other holdings2.1%—
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
9 of 9 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $LITE | Lumentum Holdings Inc | 266K | $187M | -14.7K | 63.7% |
| $KKR | KKR & Co. Inc | 1.16M | $49.4M | +251K | 16.8% |
| $AIZ | Assurant Inc | 102K | $22.3M | +19.3K | 7.6% |
| $DHI | D.R. Horton Inc | 450K | $20M | — | 6.8% |
| $BLK | BlackRock Inc | 366K | $4.72M | — | 1.6% |
| $MSFT | Microsoft Corporation | 2.67K | $987K | +0 | 0.3% |
| $JPM | JP Morgan Chase & Co | 3.18K | $936K | +132 | 0.3% |
| $AAPL | Apple Inc | 3.53K | $896K | +55 | 0.3% |
| $JNJ | Johnson & Johnson | 2.29K | $561K | +244 | 0.2% |
…and 18 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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