OSTERWEIS CAPITAL MANAGEMENT INC
SEC Form 13F institutional filer · CIK 0001007524
13F-HR · 124 reported holdings · 2026-03-31
Osterweis Capital Management Inc is an asset manager.
Reported long-US-equity value
$1.12B
Top-10 concentration
45.8%
OSTERWEIS CAPITAL MANAGEMENT INC — $1.12B AUM allocation strategy
OSTERWEIS CAPITAL MANAGEMENT INC files SEC Form 13F and reports $1.12B of long US equity value across 124 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 24.1%, followed by Financials 12.6% and Health Care 9.4%.
The top 10 holdings account for 46% 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.
OSTERWEIS CAPITAL MANAGEMENT INC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$1.12B
total across 124 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
46% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$BSX +173K sh · +$2.05M+$ABBV +104K sh · +$22.5M+$NVDA +96.2K sh · +$15.2M
Biggest trims (shares)
−$CRM −97.2K sh · −$25.8M−$AMZN −77.3K sh · −$23.7M−$AWK −46.7K sh · −$4.66M
Exited to nil (held last quarter, gone now)
$INTU ($28.6M last qtr)$SO ($173K last qtr)$DUK ($164K last qtr)$T ($155K last qtr)$CI ($119K 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)
- Semiconductors12.1%—
- Interactive Media & Services8.4%—
- Broadline Retail4.8%—
- Systems Software4.8%—
- Semiconductor Materials & Equipment4.3%—
- Transaction & Payment Processing Services3.9%—
- Automotive Retail3.8%—
- Diversified Banks3.7%—
- Other holdings54.2%—
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 |
|---|---|---|---|---|---|
| $GOOGL | Alphabet Inc | 327K | $93.8M | -32K | 8.4% |
| $AMZN | Amazon.com Inc | 259K | $54M | -77.3K | 4.8% |
| $MSFT | Microsoft Corporation | 145K | $53.6M | -32K | 4.8% |
| $AMAT | Applied Materials Inc | 142K | $48.6M | -10.7K | 4.3% |
| $AVGO | Broadcom Inc | 155K | $48M | -27K | 4.3% |
| $ADI | Analog Devices Inc | 150K | $47.8M | -1.68K | 4.3% |
| $V | Visa Inc | 144K | $43.5M | +2.66K | 3.9% |
| $AZO | AutoZone Inc | 12.6K | $42.6M | +1.27K | 3.8% |
| $JPM | JP Morgan Chase & Co | 141K | $41.6M | +2.46K | 3.7% |
| $LLY | Eli Lilly and Company | 44.8K | $41.2M | +10 | 3.7% |
…and 114 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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