Filed: 5/15/2026ACC: 0001213900-26-057307
📋 What this filing means
OBERWEIS ASSET MANAGEMENT INC/ filed this quarterly 13F‑HR report disclosing 180 equity positions with a total reported market value of $3.39B. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
180
Positions
$3.39B
Total AUM (reported)
69.98M
Total Shares
Allocation by class
COM$3.38B99.9%
ETF$1.83M0.1%
PFD$259.9K0.0%
Portfolio Concentration
Top 3$481.81M14.2%
4–10$399.84M11.8%
11–25$532.80M15.7%
Rest$1.97B58.2%
Top 3 weight
14.2%
Top 10 weight
26.0%
Voting Authority Distribution
Total shares with voting rights: 69.98M
Sole
Full voting authority
69.25M
shares
% of voting shares99.0%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
724.99K
shares
% of voting shares1.0%
Investment Discretion (by position count)
Sole180
Shared0
Other0
Dominant voting typeSole · 99.0% of voting shares
Institutional Holdings180
Rows:
Applied Optoelectronics Inc.
SOLEShares2.35M
TypeSH
Market value$198.78M
5.87%
Sole
2.35M
Shared
0.00
None
0.00
Lumentum Hldgs, Inc.
SOLEShares266.22K
TypeSH
Market value$187.09M
5.53%
Sole
257.26K
Shared
0.00
None
8.96K
Credo Technology Group
SOLEShares1.02M
TypeSH
Market value$95.93M
2.83%
Sole
999.99K
Shared
0.00
None
21.98K
DigitalOcean Holdings, Inc.
SOLEShares927.50K
TypeSH
Market value$79.56M
2.35%
Sole
896.18K
Shared
0.00
None
31.32K
SharkNinja, Inc.
SOLEShares599.97K
TypeSH
Market value$63.54M
1.88%
Sole
585.51K
Shared
0.00
None
14.46K
Nova Ltd.
SOLEShares137.96K
TypeSH
Market value$59.91M
1.77%
Sole
137.77K
Shared
0.00
None
185.00
Dana Inc.
SOLEShares1.61M
TypeSH
Market value$54.23M
1.60%
Sole
1.61M
Shared
0.00
None
0.00
BrightSpring Health Services
SOLEShares1.16M
TypeSH
Market value$49.38M
1.46%
Sole
1.16M
Shared
0.00
None
0.00
Macom Technology Solutions
SOLEShares215.89K
TypeSH
Market value$47.94M
1.42%
Sole
208.24K
Shared
0.00
None
7.65K
Rambus, Inc
SOLEShares526.32K
TypeSH
Market value$45.28M
1.34%
Sole
511.81K
Shared
0.00
None
14.51K
Clean Harbors, Inc.
SOLEShares144.35K
TypeSH
Market value$41.39M
1.22%
Sole
137.50K
Shared
0.00
None
6.85K
SiTime Corporation
SOLEShares119.28K
TypeSH
Market value$41.19M
1.22%
Sole
119.28K
Shared
0.00
None
0.00
Ultra Clean Holdings
SOLEShares640.48K
TypeSH
Market value$39.82M
1.18%
Sole
639.58K
Shared
0.00
None
900.00
Everus Construction Group
SOLEShares326.53K
TypeSH
Market value$38.55M
1.14%
Sole
326.53K
Shared
0.00
None
0.00
Frontdoor, Inc.
SOLEShares717.96K
TypeSH
Market value$37.95M
1.12%
Sole
715K
Shared
0.00
None
2.96K
Carpenter Technology Corp.
SOLEShares94.43K
TypeSH
Market value$37.22M
1.10%
Sole
94.43K
Shared
0.00
None
0.00
Skywest Inc
SOLEShares392.50K
TypeSH
Market value$36.04M
1.06%
Sole
383.49K
Shared
0.00
None
9.01K
Lattice Semiconductor Corporat
SOLEShares374.44K
TypeSH
Market value$34.73M
1.03%
Sole
374.44K
Shared
0.00
None
0.00
Globus Medical, Inc.-A
SOLEShares392.20K
TypeSH
Market value$33.79M
1.00%
Sole
392.20K
Shared
0.00
None
0.00
Camtek, Ltd.
SOLEShares222.78K
TypeSH
Market value$33.78M
1.00%
Sole
222.78K
Shared
0.00
None
0.00
Arcutis Biotherapeutics, Inc.
SOLEShares1.37M
TypeSH
Market value$32.18M
0.95%
Sole
1.37M
Shared
0.00
None
0.00
Flowserve Corporation
SOLEShares434.68K
TypeSH
Market value$31.95M
0.94%
Sole
417.18K
Shared
0.00
None
17.50K
Silicon Motion Techn ADR
SOLEShares282.55K
TypeSH
Market value$31.73M
0.94%
Sole
282.55K
Shared
0.00
None
0.00
Life Time Holdings, Inc.
SOLEShares1.16M
TypeSH
Market value$31.26M
0.92%
Sole
1.16M
Shared
0.00
None
0.00
Rush Street Interactive, Inc.
SOLEShares1.43M
TypeSH
Market value$31.20M
0.92%
Sole
1.37M
Shared
0.00
None
61.97K
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
Applied Optoelectronics Inc.SOLE | COM | 2.35M | SH | $198.78M 5.87% | 2.35M | 0.00 | 0.00 |
Lumentum Hldgs, Inc.SOLE | COM | 266.22K | SH | $187.09M 5.53% | 257.26K | 0.00 | 8.96K |
Credo Technology GroupSOLE | COM | 1.02M | SH | $95.93M 2.83% | 999.99K | 0.00 | 21.98K |
DigitalOcean Holdings, Inc.SOLE | COM | 927.50K | SH | $79.56M 2.35% | 896.18K | 0.00 | 31.32K |
SharkNinja, Inc.SOLE | COM | 599.97K | SH | $63.54M 1.88% | 585.51K | 0.00 | 14.46K |
Nova Ltd.SOLE | COM | 137.96K | SH | $59.91M 1.77% | 137.77K | 0.00 | 185.00 |
Dana Inc.SOLE | COM | 1.61M | SH | $54.23M 1.60% | 1.61M | 0.00 | 0.00 |
BrightSpring Health ServicesSOLE | COM | 1.16M | SH | $49.38M 1.46% | 1.16M | 0.00 | 0.00 |
Macom Technology SolutionsSOLE | COM | 215.89K | SH | $47.94M 1.42% | 208.24K | 0.00 | 7.65K |
Rambus, IncSOLE | COM | 526.32K | SH | $45.28M 1.34% | 511.81K | 0.00 | 14.51K |
Clean Harbors, Inc.SOLE | COM | 144.35K | SH | $41.39M 1.22% | 137.50K | 0.00 | 6.85K |
SiTime CorporationSOLE | COM | 119.28K | SH | $41.19M 1.22% | 119.28K | 0.00 | 0.00 |
Ultra Clean HoldingsSOLE | COM | 640.48K | SH | $39.82M 1.18% | 639.58K | 0.00 | 900.00 |
Everus Construction GroupSOLE | COM | 326.53K | SH | $38.55M 1.14% | 326.53K | 0.00 | 0.00 |
Frontdoor, Inc.SOLE | COM | 717.96K | SH | $37.95M 1.12% | 715K | 0.00 | 2.96K |
Carpenter Technology Corp.SOLE | COM | 94.43K | SH | $37.22M 1.10% | 94.43K | 0.00 | 0.00 |
Skywest IncSOLE | COM | 392.50K | SH | $36.04M 1.06% | 383.49K | 0.00 | 9.01K |
Lattice Semiconductor CorporatSOLE | COM | 374.44K | SH | $34.73M 1.03% | 374.44K | 0.00 | 0.00 |
Globus Medical, Inc.-ASOLE | COM | 392.20K | SH | $33.79M 1.00% | 392.20K | 0.00 | 0.00 |
Camtek, Ltd.SOLE | COM | 222.78K | SH | $33.78M 1.00% | 222.78K | 0.00 | 0.00 |
Arcutis Biotherapeutics, Inc.SOLE | COM | 1.37M | SH | $32.18M 0.95% | 1.37M | 0.00 | 0.00 |
Flowserve CorporationSOLE | COM | 434.68K | SH | $31.95M 0.94% | 417.18K | 0.00 | 17.50K |
Silicon Motion Techn ADRSOLE | COM | 282.55K | SH | $31.73M 0.94% | 282.55K | 0.00 | 0.00 |
Life Time Holdings, Inc.SOLE | COM | 1.16M | SH | $31.26M 0.92% | 1.16M | 0.00 | 0.00 |
Rush Street Interactive, Inc.SOLE | COM | 1.43M | SH | $31.20M 0.92% | 1.37M | 0.00 | 61.97K |
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