Filed: 11/17/2025ACC: 0001213900-25-111225
📋 What this filing means
OBERWEIS ASSET MANAGEMENT INC/ filed this quarterly 13F‑HR report disclosing 183 equity positions with a total reported market value of $2.61B. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
183
Positions
$2.61B
Total AUM (reported)
58.50M
Total Shares
Allocation by class
COM$2.61B100.0%
Portfolio Concentration
Top 3$200.16M7.7%
4–10$315.18M12.1%
11–25$445.27M17.0%
Rest$1.65B63.2%
Top 3 weight
7.7%
Top 10 weight
19.7%
Voting Authority Distribution
Total shares with voting rights: 58.50M
Sole
Full voting authority
57.19M
shares
% of voting shares97.8%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
1.31M
shares
% of voting shares2.2%
Investment Discretion (by position count)
Sole183
Shared0
Other0
Dominant voting typeSole · 97.8% of voting shares
Institutional Holdings183
Rows:
Credo Technology Group
SOLEShares643.95K
TypeSH
Market value$93.77M
3.59%
Sole
618.26K
Shared
0.00
None
25.69K
Lumentum Hldgs, Inc.
SOLEShares328.63K
TypeSH
Market value$53.47M
2.05%
Sole
318.74K
Shared
0.00
None
9.89K
Rambus, Inc
SOLEShares507.90K
TypeSH
Market value$52.92M
2.03%
Sole
494.34K
Shared
0.00
None
13.56K
Ambarella, Inc.
SOLEShares611.36K
TypeSH
Market value$50.45M
1.93%
Sole
595.37K
Shared
0.00
None
15.99K
SharkNinja, Inc.
SOLEShares482.81K
TypeSH
Market value$49.80M
1.91%
Sole
467.92K
Shared
0.00
None
14.89K
Applied Optoelectronics Inc.
SOLEShares1.89M
TypeSH
Market value$48.96M
1.87%
Sole
1.89M
Shared
0.00
None
0.00
Encompass Health Corporation
SOLEShares358.80K
TypeSH
Market value$45.57M
1.75%
Sole
347.62K
Shared
0.00
None
11.18K
Frontdoor, Inc.
SOLEShares610.86K
TypeSH
Market value$41.10M
1.57%
Sole
607.90K
Shared
0.00
None
2.96K
ADMA Biologics, Inc.
SOLEShares2.71M
TypeSH
Market value$39.76M
1.52%
Sole
2.66M
Shared
0.00
None
48.38K
American Superconductor
SOLEShares665.70K
TypeSH
Market value$39.54M
1.51%
Sole
665.70K
Shared
0.00
None
0.00
Sportradar Group
SOLEShares1.38M
TypeSH
Market value$37.10M
1.42%
Sole
812.20K
Shared
0.00
None
566.90K
Nova Ltd.
SOLEShares113.28K
TypeSH
Market value$36.21M
1.39%
Sole
113.10K
Shared
0.00
None
185.00
Itron Inc
SOLEShares284.15K
TypeSH
Market value$35.39M
1.36%
Sole
283.89K
Shared
0.00
None
260.00
Skywest Inc
SOLEShares330.79K
TypeSH
Market value$33.28M
1.27%
Sole
323.12K
Shared
0.00
None
7.67K
SiTime Corporation
SOLEShares106.40K
TypeSH
Market value$32.06M
1.23%
Sole
106.40K
Shared
0.00
None
0.00
Waystar Holding Corp.
SOLEShares836.55K
TypeSH
Market value$31.72M
1.21%
Sole
815.49K
Shared
0.00
None
21.06K
Mercury Systems, Inc.
SOLEShares398.50K
TypeSH
Market value$30.84M
1.18%
Sole
398.50K
Shared
0.00
None
0.00
Clean Harbors, Inc.
SOLEShares116.77K
TypeSH
Market value$27.12M
1.04%
Sole
109.54K
Shared
0.00
None
7.23K
Stride, Inc.
SOLEShares181.80K
TypeSH
Market value$27.08M
1.04%
Sole
181.80K
Shared
0.00
None
0.00
BrightSpring Health Services
SOLEShares908K
TypeSH
Market value$26.84M
1.03%
Sole
908K
Shared
0.00
None
0.00
Primoris Services Corp.
SOLEShares192.40K
TypeSH
Market value$26.42M
1.01%
Sole
192.40K
Shared
0.00
None
0.00
Digital Ocean Holdings, Inc.
SOLEShares772K
TypeSH
Market value$26.37M
1.01%
Sole
746.93K
Shared
0.00
None
25.07K
Osi Systems, Inc.
SOLEShares101.40K
TypeSH
Market value$25.27M
0.97%
Sole
101.40K
Shared
0.00
None
0.00
Tutor Perini Corp.
SOLEShares377.80K
TypeSH
Market value$24.78M
0.95%
Sole
377.80K
Shared
0.00
None
0.00
Veracyte, Inc.
SOLEShares721.69K
TypeSH
Market value$24.78M
0.95%
Sole
716.54K
Shared
0.00
None
5.15K
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
Credo Technology GroupSOLE | COM | 643.95K | SH | $93.77M 3.59% | 618.26K | 0.00 | 25.69K |
Lumentum Hldgs, Inc.SOLE | COM | 328.63K | SH | $53.47M 2.05% | 318.74K | 0.00 | 9.89K |
Rambus, IncSOLE | COM | 507.90K | SH | $52.92M 2.03% | 494.34K | 0.00 | 13.56K |
Ambarella, Inc.SOLE | COM | 611.36K | SH | $50.45M 1.93% | 595.37K | 0.00 | 15.99K |
SharkNinja, Inc.SOLE | COM | 482.81K | SH | $49.80M 1.91% | 467.92K | 0.00 | 14.89K |
Applied Optoelectronics Inc.SOLE | COM | 1.89M | SH | $48.96M 1.87% | 1.89M | 0.00 | 0.00 |
Encompass Health CorporationSOLE | COM | 358.80K | SH | $45.57M 1.75% | 347.62K | 0.00 | 11.18K |
Frontdoor, Inc.SOLE | COM | 610.86K | SH | $41.10M 1.57% | 607.90K | 0.00 | 2.96K |
ADMA Biologics, Inc.SOLE | COM | 2.71M | SH | $39.76M 1.52% | 2.66M | 0.00 | 48.38K |
American SuperconductorSOLE | COM | 665.70K | SH | $39.54M 1.51% | 665.70K | 0.00 | 0.00 |
Sportradar GroupSOLE | COM | 1.38M | SH | $37.10M 1.42% | 812.20K | 0.00 | 566.90K |
Nova Ltd.SOLE | COM | 113.28K | SH | $36.21M 1.39% | 113.10K | 0.00 | 185.00 |
Itron IncSOLE | COM | 284.15K | SH | $35.39M 1.36% | 283.89K | 0.00 | 260.00 |
Skywest IncSOLE | COM | 330.79K | SH | $33.28M 1.27% | 323.12K | 0.00 | 7.67K |
SiTime CorporationSOLE | COM | 106.40K | SH | $32.06M 1.23% | 106.40K | 0.00 | 0.00 |
Waystar Holding Corp.SOLE | COM | 836.55K | SH | $31.72M 1.21% | 815.49K | 0.00 | 21.06K |
Mercury Systems, Inc.SOLE | COM | 398.50K | SH | $30.84M 1.18% | 398.50K | 0.00 | 0.00 |
Clean Harbors, Inc.SOLE | COM | 116.77K | SH | $27.12M 1.04% | 109.54K | 0.00 | 7.23K |
Stride, Inc.SOLE | COM | 181.80K | SH | $27.08M 1.04% | 181.80K | 0.00 | 0.00 |
BrightSpring Health ServicesSOLE | COM | 908K | SH | $26.84M 1.03% | 908K | 0.00 | 0.00 |
Primoris Services Corp.SOLE | COM | 192.40K | SH | $26.42M 1.01% | 192.40K | 0.00 | 0.00 |
Digital Ocean Holdings, Inc.SOLE | COM | 772K | SH | $26.37M 1.01% | 746.93K | 0.00 | 25.07K |
Osi Systems, Inc.SOLE | COM | 101.40K | SH | $25.27M 0.97% | 101.40K | 0.00 | 0.00 |
Tutor Perini Corp.SOLE | COM | 377.80K | SH | $24.78M 0.95% | 377.80K | 0.00 | 0.00 |
Veracyte, Inc.SOLE | COM | 721.69K | SH | $24.78M 0.95% | 716.54K | 0.00 | 5.15K |
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