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Livermore
Livermore
ZHEN

Boston Common Asset Management, LLC

SEC CIK
0001409427
Latest filing
Jul 21, 2026

The latest 13F from Boston Common Asset Management, LLC covers Q2 2026 (filed Jul 21, 2026): 186 long positions worth $1.69B. The top 10 holdings make up 32.9% of the portfolio, and the largest is Taiwan Semiconductor Manufacturing Co Ltd (TSM) at 7.5%. Livermore has 23 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
13
Est. +$38.8M
Added
43
Est. +$52.3M
Reduced
114
Est. −$137.1M
Sold out
13
Est. −$20.9M

Top 5 holdings

Share of this quarter's portfolio value

  1. TSMTaiwan Semiconductor Manufacturing Co Ltd
    7.5%$126.7MHistory
  2. NVDANVIDIA Corp
    4.3%$73.0MHistory
  3. AAPLApple Inc.
    3.9%$65.1MHistory
  4. MSFTMicrosoft Corp
    3.5%$58.9MHistory
  5. GOOGLAlphabet Inc.
    3.0%$50.9MHistory

Biggest buys

New and added positions, by estimated amount bought

  1. AMDAdvanced Micro Devices Inc
    +$9.27MNewHistory
  2. SBSCompanhia de Saneamento Basico Do Estado de Sao Paulo-Sabesp
    +$5.60MNewHistory
  3. MUMicron Technology Inc
    +$5.44MAddedHistory
  4. MSFTMicrosoft Corp
    +$5.32MAddedHistory
  5. IFNNYInfineon Technologies AG
    +$4.20MNewHistory

Largest weight increases

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

  1. MUMicron Technology Inc
    +1.20 pp0.4% → 1.6%History
  2. AMATApplied Materials Inc
    +1.09 pp1.0% → 2.1%History
  3. AMDAdvanced Micro Devices Inc
    +0.55 pp0.0% → 0.5%History
  4. GOOGLAlphabet Inc.
    +0.41 pp2.6% → 3.0%History
  5. SBSCompanhia de Saneamento Basico Do Estado de Sao Paulo-Sabesp
    +0.33 pp0.0% → 0.3%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. TSMTaiwan Semiconductor Manufacturing Co Ltd
    −$10.7MReducedHistory
  2. VRTVertiv Holdings Co
    −$8.65MReducedHistory
  3. PGProcter & Gamble Co
    −$7.55MReducedHistory
  4. NVDANVIDIA Corp
    −$7.37MReducedHistory
  5. GOOGAlphabet Inc.
    −$6.42MReducedHistory

Largest weight decreases

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

  1. NFLXNetflix Inc
    −0.84 pp2.2% → 1.3%History
  2. TCOMTrip.com Group Ltd
    −0.52 pp0.8% → 0.2%History
  3. PGProcter & Gamble Co
    −0.50 pp0.8% → 0.3%History
  4. CRMSalesforce, Inc.
    −0.47 pp0.9% → 0.4%History
  5. TMUST-Mobile US, Inc.
    −0.38 pp1.1% → 0.7%History

Metrics

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

Portfolio value
$1.69B
+$134.2M (+8.6%) vs. prior quarter
Positions
186
0 vs. prior quarter
Top 10 concentration
32.9%
Top 10 as share of value
Turnover
5.6%
Q2 2026, one quarter
Average holding period
16.2 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 $4.81B (Q1 2023)

Q1 2021: $1.58BQ2 2021: $2.33BQ3 2021: $2.31BQ4 2021: $2.47BQ1 2022: $2.31BQ2 2022: $2.01BQ3 2022: $1.91BQ4 2022: $2.09BQ1 2023: $4.81BQ2 2023: $4.68BQ3 2023: $4.19BQ4 2023: $4.39BQ1 2024: $4.18BQ2 2024: $3.90BQ3 2024: $3.84BQ4 2024: $3.43BQ1 2025: $3.29BQ2 2025: $3.57BQ3 2025: $3.58BQ4 2025: $1.66BQ1 2026: $1.55BQ2 2026: $1.69B
Q1 2021Q2 2026
13F filings of Boston Common Asset Management, LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Jul 21, 2026186$1.69BTSMNVDAAAPLvs. Q1 2026SEC
Q1 2026May 7, 2026186$1.55BTSMNVDAAAPLvs. Q4 2025SEC
Q4 2025May 7, 2026Amended195$1.66BTSMNVDAMSFTvs. Q3 2025SEC
Q3 2025Oct 30, 2025299$3.58BTSMNVDAMSFTvs. Q2 2025SEC
Q2 2025Jul 22, 2025299$3.57BTSMMSFTNVDAvs. Q1 2025SEC
Q1 2025Apr 3, 2025292$3.29BTSMMSFTAAPLvs. Q4 2024SEC
Q4 2024Jan 15, 2025300$3.43BTSMAAPLMSFTvs. Q3 2024SEC
Q3 2024Oct 9, 2024313$3.84BTSMSchneider Electric OrdfDTEGFvs. Q2 2024SEC
Q2 2024Jul 8, 2024314$3.90BTSMSchneider Electric OrdfORXCFvs. Q1 2024SEC
Q1 2024Apr 11, 2024304$4.18BTSMSchneider Electric OrdfORXCFvs. Q4 2023SEC
Q4 2023Jan 9, 2024305$4.39BSchneider Electric OrdfDTEGFOversea-Chinese BKvs. Q3 2023SEC
Q3 2023Oct 11, 2023305$4.19BSchneider Electric OrdfORXCFDTEGFvs. Q2 2023SEC
Q2 2023Jul 24, 2023301$4.68BSchneider Electric OrdfIFNNFDTEGFvs. Q1 2023SEC
Q1 2023May 17, 2023296$4.81BDTEGFSchneider Electric OrdfIFNNFvs. Q4 2022SEC
Q4 2022Jan 26, 2023258$2.09BMRKGILDHDBvs. Q3 2022SEC
Q3 2022Oct 20, 2022256$1.91BMRKTSMAAPLvs. Q2 2022SEC
Q2 2022Aug 10, 2022264$2.01BMRKTSMBABAvs. Q1 2022SEC
Q1 2022May 16, 2022264$2.31BTSMHDBMRKvs. Q4 2021SEC
Q4 2021Jan 31, 2022262$2.47BTSMHDBMSFTvs. Q3 2021SEC
Q3 2021Nov 12, 2021254$2.31BTSMHDBCARRvs. Q2 2021SEC
Q2 2021Aug 19, 2021256$2.33BTSMBABAHDBvs. Q1 2021SEC
Q1 2021May 14, 2021254$1.58BTSMBABAHDB–SEC