DOSSIER · 13F-HR · Q1 2026

OSTERWEIS CAPITAL MANAGEMENT INC

$1.9B in tracked AUM across 277 positions as of Q1 2026.

OC
CIK 0001007524 · last filed Mar 31, 2026
Total AUM
$1.9B
as of Q1 2026
Holdings
277
positions
Whale Score
56
56
tracked
Activity
no data
changes this Q
AI Analysis · Q1 2026

Last quarter, Osterweis Capital Management held nine convertible notes all maturing within a tight ten-week window — Airbnb, Bentley Systems, Marriott Vacations, Summit Hotel Properties, Cable One, Enphase Energy, Haemonetics, Vail Resorts, and Alarm.com, each dated January-March 2026. This quarter, every one of those nine has rolled off and been replaced by nine new converts with later maturities (May 2026 through December 2027) — Affirm, a new Marriott Vacations note, JBT Marel, Penn Entertainment, Q2 Holdings, Pebblebrook Hotel, Ziff Davis, plus straight equity in AbbVie, Public Storage, and SLB. That's the defining behavior of a convertible-bond ladder hitting its maturity wall, not a change in conviction. On the equity side, NVIDIA saw a genuine 72.6% share increase, while Amazon was cut a real 23.0%.

Nine converts maturing together, rolled at once

Last quarter's holdings included nine convertible notes bunched into a narrow maturity window — Airbnb (03/15/26), Bentley Systems (01/15/26), Marriott Vacations (01/15/26), Summit Hotel Properties (02/15/26), Cable One (03/15/26), Enphase Energy (03/01/26), Haemonetics (03/01/26), Vail Resorts (01/01/26), and Alarm.com (01/15/26) — together over $563 million, more than a quarter of the book. This quarter, all nine are gone, replaced by new convertible positions with meaningfully later maturities: a new Marriott Vacations note (12/15/27), JBT Marel (05/15/26), Penn Entertainment (05/15/26), Q2 Holdings (06/01/26), Pebblebrook Hotel (12/15/26), and Ziff Davis (11/01/26), plus a new Affirm note. This is the mechanical behavior of a convertible-arbitrage ladder reaching its maturity wall and rolling forward — not nine independent decisions to exit and nine independent decisions to enter.

Quarter at a glance — Q1 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q1 2026.

#HoldingValueSharesWeight
01
GOOG
ALPHABET INC
$94M327K4.8%
02
AFRM 0 11/15/26
AFFIRM HLDGS INC
$56M57.5M2.9%
03
AMZN
AMAZON COM INC
$54M259K2.8%
04
MSFT
MICROSOFT CORP
$54M145K2.8%
05
AMAT
APPLIED MATLS INC
$49M142K2.5%
06
VAC 3.25 12/15/27
MARRIOTT VACATIONS WORLDWIDE
$48M50.0M2.5%
07
AVGO
BROADCOM INC
$48M155K2.5%
08
ADI
ANALOG DEVICES INC
$48M150K2.5%
09
V
VISA INC
$43M144K2.2%
10
AZO
AUTOZONE INC
$43M13K2.2%

Filing history

2026Q1Mar 31
$1.9B 17.9%
277 positionsView →
2025Q4Dec 31
$2.4B 6.6%
331 positionsView →
2025Q3Sep 30
$2.2B 6.0%
320 positionsView →
2025Q2Jun 30
$2.1B 89.7%
327 positionsLocked
2025Q1Mar 31
$20.3B 842.7%
383 positionsLocked
2024Q4Dec 31
$2.1B 8.9%
246 positionsLocked
2024Q3Sep 30
$2.0B 2.0%
240 positionsLocked
2024Q2Jun 30
$1.9B 13.7%
243 positionsLocked
2024Q1Mar 31
$1.7B 8.1%
236 positionsLocked
2023Q4Dec 31
$1.6B 15.4%
244 positionsLocked
2023Q3Sep 30
$1.4B 9.6%
251 positionsLocked
2023Q2Jun 30
$1.5B 2.8%
256 positionsLocked
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