SEC 13F Intelligence

Managers / Q1 2026

OBERWEIS ASSET MANAGEMENT INC/

CIK 0000937886 · 3333 WARRENVILLE ROAD, SUITE 500, LISLE, IL, 60532 · 6305772300

Reported Value
$3.4B
Q1 2026
Positions
180
Filings on Record
30
2019–present window
Filed
May 15, 2026
original filing

Summary

Oberweis Asset Management Inc/ reported $3.4B in U.S.-listed holdings across 180 positions for Q1 2026.

Its largest position, AAOI, represents 5.9% of the portfolio.

Compared with Q4 2025, the fund opened 22 new positions and exited 21.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $447MQ4 ’18Q1 ’19: $498MQ2 ’19: $550MQ3 ’19: $443MQ4 ’19: $300MQ4 ’19Q1 ’20: $181MQ2 ’20: $255MQ3 ’20: $297MQ4 ’20: $380MQ4 ’20Q1 ’21: $489MQ2 ’21: $456MQ3 ’21: $483MQ4 ’21: $548MQ4 ’21Q1 ’22: $499MQ2 ’22: $395MQ3 ’22: $427MQ4 ’22: $470.4BQ4 ’22Q1 ’23: $645MQ2 ’23: $823MQ3 ’23: $941MQ4 ’23: $1.1BQ4 ’23Q1 ’24: $1.4BQ2 ’24: $1.6BQ3 ’24: $2.0BQ4 ’24: $2.1BQ4 ’24Q1 ’25: $2.0BQ2 ’25: $2.3BQ3 ’25: $2.6BQ4 ’25: $2.7BQ4 ’25Q1 ’26: $3.4Bfilingsflow.com

Portfolio Composition

By security type

Composition data arrives with ticker enrichment.

Quarter-over-Quarter Changes full breakdown →

Holdings — Q1 2026

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Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q1 2026$3.4B180May 15, 202613F-HRchanges · EDGAR ↗
Q4 2025$2.7B179Feb 17, 202613F-HRchanges · EDGAR ↗
Q3 2025$2.6B183Nov 17, 202513F-HRchanges · EDGAR ↗
Q2 2025$2.3B185Aug 14, 202513F-HRchanges · EDGAR ↗
Q1 2025$2.0B192May 15, 202513F-HRchanges · EDGAR ↗
Q4 2024$2.1B196Feb 14, 202513F-HRchanges · EDGAR ↗
Q3 2024$2.0B206Nov 14, 202413F-HRchanges · EDGAR ↗
Q2 2024$1.6B197Aug 14, 202413F-HRchanges · EDGAR ↗
Q1 2024$1.4B196May 15, 202413F-HRchanges · EDGAR ↗
Q4 2023$1.1B192Feb 14, 202413F-HRchanges · EDGAR ↗
Q3 2023$941M195Nov 14, 202313F-HRchanges · EDGAR ↗
Q2 2023$823M187Aug 14, 202313F-HRchanges · EDGAR ↗
Q1 2023$645M174May 15, 202313F-HRchanges · EDGAR ↗
Q4 2022$470.4B168Feb 14, 202313F-HRchanges · EDGAR ↗
Q3 2022$427M173Nov 14, 202213F-HRchanges · EDGAR ↗
Q2 2022$395M164Aug 15, 202213F-HRchanges · EDGAR ↗
Q1 2022$499M165May 16, 202213F-HRchanges · EDGAR ↗
Q4 2021$548M160Feb 14, 202213F-HRchanges · EDGAR ↗
Q3 2021$483M162Nov 15, 202113F-HRchanges · EDGAR ↗
Q2 2021$456M163Aug 16, 202113F-HRchanges · EDGAR ↗
Q1 2021$489M170May 17, 202113F-HRchanges · EDGAR ↗
Q4 2020$380M138Feb 16, 202113F-HRchanges · EDGAR ↗
Q3 2020$297M126Nov 16, 202013F-HRchanges · EDGAR ↗
Q2 2020$255M123Aug 14, 202013F-HRchanges · EDGAR ↗
Q1 2020$181M172May 15, 202013F-HRchanges · EDGAR ↗
Q4 2019$300M200Feb 14, 202013F-HRchanges · EDGAR ↗
Q3 2019$443M196Nov 14, 201913F-HRchanges · EDGAR ↗
Q2 2019$550M196Aug 14, 201913F-HRchanges · EDGAR ↗
Q1 2019$498M201May 15, 201913F-HRchanges · EDGAR ↗
Q4 2018$447M200Feb 14, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.