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Livermore
Livermore
ZHEN

Bright Rock Capital Management, LLC

SEC CIK
0001509973
Latest filing
Jul 8, 2026

The latest 13F from Bright Rock Capital Management, LLC covers Q2 2026 (filed Jul 8, 2026): 73 long positions worth $499.1M. The top 10 holdings make up 37.4% of the portfolio, and the largest is Alphabet Inc. (GOOGL) at 5.6%. 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
4
Est. +$25.2M
Added
5
Est. +$27.8M
Reduced
3
Est. −$26.9M
Sold out
6
Est. −$42.9M

Top 5 holdings

Share of this quarter's portfolio value

  1. GOOGLAlphabet Inc.
    5.6%$27.9MHistory
  2. MSFTMicrosoft Corp
    5.5%$27.6MHistory
  3. NVDANVIDIA Corp
    4.4%$22.0MHistory
  4. MAMastercard Inc
    3.9%$19.3MHistory
  5. MRKMerck & Co., Inc.
    3.7%$18.2MHistory

Share of portfolio

Top 5 holdings and the other 68 positions, by share of portfolio value

  1. GOOGL5.6%
  2. MSFT5.5%
  3. NVDA4.4%
  4. MA3.9%
  5. MRK3.7%
  6. Other 68 positions77.0%

Biggest buys

New and added positions, by estimated amount bought

  1. SPGIS&P Global Inc.
    +$9.16MNewHistory
  2. VEEVVeeva Systems Inc
    +$7.63MAddedHistory
  3. ACNAccenture plc
    +$7.47MNewHistory
  4. NFLXNetflix Inc
    +$7.14MNewHistory
  5. NVDANVIDIA Corp
    +$6.00MAddedHistory

Largest weight increases

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

  1. SPGIS&P Global Inc.
    +1.84 pp0.0% → 1.8%History
  2. NVDANVIDIA Corp
    +1.65 pp2.8% → 4.4%History
  3. VEEVVeeva Systems Inc
    +1.57 pp1.5% → 3.1%History
  4. ACNAccenture plc
    +1.50 pp0.0% → 1.5%History
  5. NFLXNetflix Inc
    +1.43 pp0.0% → 1.4%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. HONHoneywell International Inc
    −$11.9MSold outHistory
  2. MKCMcCormick & Co Inc
    −$11.6MSold outHistory
  3. iShares Tr464287796
    −$11.3MReduced
  4. GOOGLAlphabet Inc.
    −$9.65MReducedHistory
  5. CTSHCognizant Technology Solutions Corp
    −$8.28MSold outHistory

Largest weight decreases

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

  1. iShares Tr464287796
    −2.71 pp3.8% → 1.1%
  2. HONHoneywell International Inc
    −2.35 pp2.3% → 0.0%History
  3. MKCMcCormick & Co Inc
    −2.29 pp2.3% → 0.0%History
  4. CTSHCognizant Technology Solutions Corp
    −1.64 pp1.6% → 0.0%History
  5. State Street Technology Select Sector SPDR ETF81369Y803
    −0.96 pp1.0% → 0.0%

Metrics

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

Portfolio value
$499.1M
−$6.86M (−1.4%) vs. prior quarter
Positions
73
−2 vs. prior quarter
Top 10 concentration
37.4%
Top 10 as share of value
Turnover
10.6%
Q2 2026, one quarter
Average holding period
15.3 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 $510.2M (Q3 2025)

Q1 2021: $391.2MQ2 2021: $415.7MQ3 2021: $399.6MQ4 2021: $440.7MQ1 2022: $423.7MQ2 2022: $370.5MQ3 2022: $356.5MQ4 2022: $385.7MQ1 2023: $400.0MQ2 2023: $429.0MQ3 2023: $409.4MQ4 2023: $441.6MQ1 2024: $482.6MQ2 2024: $474.4MQ3 2024: $497.3MQ4 2024: $468.9MQ1 2025: $474.7MQ2 2025: $494.0MQ3 2025: $510.2MQ4 2025: $508.7MQ1 2026: $505.9MQ2 2026: $499.1M
Q1 2021Q2 2026
13F filings of Bright Rock Capital Management, LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Jul 8, 202673$499.1MGOOGLMSFTNVDAvs. Q1 2026SEC
Q1 2026Apr 16, 202675$505.9MGOOGLMSFTiShares Trvs. Q4 2025SEC
Q4 2025Jan 15, 202677$508.7MGOOGLMSFTMAvs. Q3 2025SEC
Q3 2025Nov 4, 202573$510.2MMSFTGOOGLMAvs. Q2 2025SEC
Q2 2025Jul 10, 202574$494.0MMSFTGOOGLMAvs. Q1 2025SEC
Q1 2025Apr 16, 202576$474.7MMSFTGOOGLMAvs. Q4 2024SEC
Q4 2024Jan 14, 202571$468.9MMSFTGOOGLMAvs. Q3 2024SEC
Q3 2024Oct 3, 202471$497.3MMSFTGOOGLMAvs. Q2 2024SEC
Q2 2024Jul 23, 202470$474.4MMSFTGOOGLMAvs. Q1 2024SEC
Q1 2024Apr 11, 202469$482.6MMSFTGOOGLMAvs. Q4 2023SEC
Q4 2023Jan 11, 202468$441.6MMSFTGOOGLMAvs. Q3 2023SEC
Q3 2023Oct 26, 202372$409.4MGOOGLMSFTMAvs. Q2 2023SEC
Q2 2023Jul 27, 202380$429.0MMSFTGOOGLMAvs. Q1 2023SEC
Q1 2023Apr 24, 202379$400.0MMSFTGOOGLMAvs. Q4 2022SEC
Q4 2022Jan 24, 202379$385.7MMSFTMAJPMvs. Q3 2022SEC
Q3 2022Oct 19, 202282$356.5MMSFTUNHiShares Trvs. Q2 2022SEC
Q2 2022Jul 13, 202281$370.5MMSFTGOOGLUNHvs. Q1 2022SEC
Q1 2022Apr 18, 202276$423.7MMSFTGOOGLUNHvs. Q4 2021SEC
Q4 2021Jan 27, 202276$440.7MMSFTGOOGLMETAvs. Q3 2021SEC
Q3 2021Oct 25, 202173$399.6MGOOGLMETAMSFTvs. Q2 2021SEC
Q2 2021Jul 19, 202176$415.7MMETAGOOGLState Street Energy Select Sector SPDR ETFvs. Q1 2021SEC
Q1 2021Apr 22, 202175$391.2MMETAState Street Energy Select Sector SPDR ETFGOOGL–SEC