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Livermore
Livermore
ZHEN

Oberweis Asset Management Inc

SEC CIK
0000937886
Latest filing
Aug 14, 2026

The latest 13F from Oberweis Asset Management Inc covers Q2 2026 (filed Aug 14, 2026): 176 long positions worth $4.84B. The top 10 holdings make up 26.6% of the portfolio, and the largest is Credo Technology Group Holding Ltd (CRDO) at 5.7%. Livermore has 22 filings on Form 13F from this institution, going back to Q1 2021.

What changed in Q2 2026

Share counts compared with Q1 2026: how many positions were new, added to, reduced or sold out, and the biggest buys and sells. Dollar amounts are estimated at the quarter-end prices implied by the filing.

Full comparison
New
22
Est. +$491.2M
Added
113
Est. +$404.4M
Reduced
28
Est. −$350.5M
Sold out
26
Est. −$282.0M

Top 5 holdings

Share of this quarter's portfolio value

  1. CRDOCredo Technology Group Holding Ltd
    5.7%$275.6MHistory
  2. AAOIApplied Optoelectronics, Inc.
    5.5%$265.4MHistory
  3. DOCNDigitalOcean Holdings, Inc.
    3.0%$146.0MHistory
  4. SIMOSilicon Motion Technology CORP
    2.2%$105.4MHistory
  5. UCTTUltra Clean Holdings, Inc.
    1.9%$92.3MHistory

Share of portfolio

Top 5 holdings and the other 171 positions, by share of portfolio value

  1. CRDO5.7%
  2. AAOI5.5%
  3. DOCN3.0%
  4. SIMO2.2%
  5. UCTT1.9%
  6. Other 171 positions81.7%

Biggest buys

New and added positions, by estimated amount bought

  1. MXLMaxlinear, Inc
    +$40.9MNewHistory
  2. NOVTNovanta Inc
    +$39.6MNewHistory
  3. BLLNBillionToOne, Inc.
    +$35.9MNewHistory
  4. ESIElement Solutions Inc
    +$35.3MNewHistory
  5. OUSTOuster, Inc.
    +$34.1MNewHistory

Largest weight increases

New and added positions, by percentage points of the portfolio gained

  1. SIMOSilicon Motion Technology CORP
    +1.24 pp0.9% → 2.2%History
  2. HNGEHinge Health, Inc.
    +0.94 pp0.5% → 1.5%History
  3. MXLMaxlinear, Inc
    +0.85 pp0.0% → 0.8%History
  4. NOVTNovanta Inc
    +0.82 pp0.0% → 0.8%History
  5. BLLNBillionToOne, Inc.
    +0.74 pp0.0% → 0.7%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. LITELumentum Holdings Inc.
    −$166.5MReducedHistory
  2. AAOIApplied Optoelectronics, Inc.
    −$82.8MReducedHistory
  3. FLSFlowserve Corp
    −$32.0MSold outHistory
  4. PRIMPrimoris Services Corp
    −$23.8MSold outHistory
  5. GGenpact LTD
    −$22.6MSold outHistory

Largest weight decreases

Reduced and sold-out positions, by percentage points of the portfolio lost

  1. LITELumentum Holdings Inc.
    −4.25 pp5.5% → 1.3%History
  2. FLSFlowserve Corp
    −0.94 pp0.9% → 0.0%History
  3. DANDANA Inc
    −0.86 pp1.6% → 0.7%History
  4. PRIMPrimoris Services Corp
    −0.70 pp0.7% → 0.0%History
  5. GGenpact LTD
    −0.67 pp0.7% → 0.0%History

Metrics

13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.

Portfolio value
$4.84B
+$1.45B (+42.9%) vs. prior quarter
Positions
176
−4 vs. prior quarter
Top 10 concentration
26.6%
Top 10 as share of value
Turnover
15.4%
Q2 2026, one quarter
Average holding period
7.8 quarters
Weighted by value

How these are calculated

  • Portfolio value: the market value of all long positions in the 13F, as reported at quarter end, excluding options.
  • Top 10 concentration: the combined value of the 10 largest positions as a share of portfolio value.
  • Turnover: the smaller of this quarter's estimated purchases and estimated sales, divided by the average of this and last quarter's portfolio value. Estimates multiply the change in shares by the quarter-end price implied by the filing (market value divided by shares); new positions use this quarter's value and sold-out positions last quarter's. Only positions reported in shares count, and it is not calculated when the previous quarter was not filed.
  • Average holding period: how many consecutive quarters each current position has been held (including this one; a quarter without the position or without a filing starts the count over), weighted by this quarter's value. Counting starts with the first 13F in Livermore (Q1 2021), so positions held before then are understated.

13F filings by quarter

22 quarters, going back to Q1 2021. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $4.84B (Q2 2026)

Q1 2021: $488.9MQ2 2021: $456.5MQ3 2021: $482.9MQ4 2021: $548.1MQ1 2022: $499.2MQ2 2022: $395.1MQ3 2022: $427.3MQ4 2022: $470.4MQ1 2023: $644.5MQ2 2023: $822.8MQ3 2023: $941.5MQ4 2023: $1.07BQ1 2024: $1.38BQ2 2024: $1.63BQ3 2024: $1.95BQ4 2024: $2.12BQ1 2025: $2.01BQ2 2025: $2.30BQ3 2025: $2.61BQ4 2025: $2.73BQ1 2026: $3.39BQ2 2026: $4.84B
Q1 2021Q2 2026
13F filings of Oberweis Asset Management Inc by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 14, 2026176$4.84BCRDOAAOIDOCNvs. Q1 2026SEC
Q1 2026May 15, 2026180$3.39BAAOILITECRDOvs. Q4 2025SEC
Q4 2025Feb 17, 2026179$2.73BLITECRDOAAOIvs. Q3 2025SEC
Q3 2025Nov 17, 2025183$2.61BCRDOLITERMBSvs. Q2 2025SEC
Q2 2025Aug 14, 2025185$2.30BCRDOADMAAAOIvs. Q1 2025SEC
Q1 2025May 15, 2025192$2.01BADMACRDOSNvs. Q4 2024SEC
Q4 2024Feb 14, 2025196$2.12BCRDOADMASNvs. Q3 2024SEC
Q3 2024Nov 14, 2024206$1.95BADMASNZETAvs. Q2 2024SEC
Q2 2024Aug 14, 2024197$1.63BWFRDCSTMSNvs. Q1 2024SEC
Q1 2024May 15, 2024196$1.38BCSTMWFRDACLSvs. Q4 2023SEC
Q4 2023Feb 14, 2024192$1.07BCSTMACLSAEHRvs. Q3 2023SEC
Q3 2023Nov 14, 2023195$941.5MCSTMAEHRACLSvs. Q2 2023SEC
Q2 2023Aug 14, 2023187$822.8MCSTMACLSAEHRvs. Q1 2023SEC
Q1 2023May 15, 2023174$644.5MCSTMACLSAEHRvs. Q4 2022SEC
Q4 2022Feb 14, 2023168$470.4MCSTMACLSAEHRvs. Q3 2022SEC
Q3 2022Nov 14, 2022173$427.3MCSTMNVMIDAVAvs. Q2 2022SEC
Q2 2022Aug 15, 2022164$395.1MCSTMNVMIDAVAvs. Q1 2022SEC
Q1 2022May 16, 2022165$499.2MCSTMNVMIDAVAvs. Q4 2021SEC
Q4 2021Feb 14, 2022160$548.1MCSTMNVMIDAVAvs. Q3 2021SEC
Q3 2021Nov 15, 2021162$482.9MCSTMDAVASEvs. Q2 2021SEC
Q2 2021Aug 16, 2021163$456.5MCSTMDAVASEvs. Q1 2021SEC
Q1 2021May 17, 2021170$488.9MCSTMFVRRKRNT–SEC