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Livermore
Livermore
ZHEN

Horizon Investment Services, LLC

SEC CIK
0001426940
Latest filing
Aug 6, 2026

The latest 13F from Horizon Investment Services, LLC covers Q2 2026 (filed Aug 6, 2026): 143 long positions worth $359.5M. The top 10 holdings make up 38.3% of the portfolio, and the largest is Lam Research Corp (LRCX) at 6.4%. 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
23
Est. +$22.2M
Added
49
Est. +$10.8M
Reduced
55
Est. −$18.1M
Sold out
17
Est. −$16.8M

Top 5 holdings

Share of this quarter's portfolio value

  1. LRCXLam Research Corp
    6.4%$23.2MHistory
  2. NVDANVIDIA Corp
    6.1%$21.9MHistory
  3. MUMicron Technology Inc
    4.7%$16.8MHistory
  4. GOOGLAlphabet Inc.
    4.4%$15.9MHistory
  5. Vanguard Scottsdale FDS92206C409
    4.1%$14.6M

Share of portfolio

Top 5 holdings and the other 138 positions, by share of portfolio value

  1. LRCX6.4%
  2. NVDA6.1%
  3. MU4.7%
  4. GOOGL4.4%
  5. Vanguard Scottsdale FDS4.1%
  6. Other 138 positions74.3%

Biggest buys

New and added positions, by estimated amount bought

  1. DELLDell Technologies Inc.
    +$4.81MAddedHistory
  2. STTState Street Corp
    +$4.79MNewHistory
  3. SANMSanmina Corp
    +$2.73MNewHistory
  4. SNXTD Synnex Corp
    +$2.64MNewHistory
  5. WABWestinghouse Air Brake Technologies Corp
    +$1.70MNewHistory

Largest weight increases

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

  1. DELLDell Technologies Inc.
    +1.77 pp0.4% → 2.2%History
  2. STTState Street Corp
    +1.33 pp0.0% → 1.3%History
  3. SANMSanmina Corp
    +0.76 pp0.0% → 0.8%History
  4. SNXTD Synnex Corp
    +0.73 pp0.0% → 0.7%History
  5. WABWestinghouse Air Brake Technologies Corp
    +0.47 pp0.0% → 0.5%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. HIGHartford Insurance Group, Inc.
    −$4.25MReducedHistory
  2. FLSFlowserve Corp
    −$2.64MSold outHistory
  3. PGRProgressive Corp
    −$2.59MReducedHistory
  4. SCHWSchwab Charles Corp
    −$2.45MSold outHistory
  5. BKNGBooking Holdings Inc.
    −$2.36MSold outConverted for a 25-for-1 splitHistory

Largest weight decreases

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

  1. HIGHartford Insurance Group, Inc.
    −1.53 pp1.6% → 0.1%History
  2. Vanguard Scottsdale FDS92206C409
    −1.43 pp5.5% → 4.1%
  3. FLSFlowserve Corp
    −0.92 pp0.9% → 0.0%History
  4. SCHWSchwab Charles Corp
    −0.85 pp0.9% → 0.0%History
  5. PGRProgressive Corp
    −0.84 pp1.0% → 0.2%History

Metrics

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

Portfolio value
$359.5M
+$72.0M (+25.0%) vs. prior quarter
Positions
143
+6 vs. prior quarter
Top 10 concentration
38.3%
Top 10 as share of value
Turnover
10.2%
Q2 2026, one quarter
Average holding period
12.6 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 $359.5M (Q2 2026)

Q1 2021: $186.1MQ2 2021: $203.7MQ3 2021: $203.1MQ4 2021: $218.4MQ1 2022: $190.9MQ2 2022: $151.1MQ3 2022: $138.2MQ4 2022: $137.8MQ1 2023: $155.8MQ2 2023: $163.7MQ3 2023: $166.3MQ4 2023: $185.2MQ1 2024: $204.3MQ2 2024: $212.1MQ3 2024: $234.0MQ4 2024: $235.2MQ1 2025: $205.9MQ2 2025: $228.2MQ3 2025: $264.9MQ4 2025: $277.9MQ1 2026: $287.5MQ2 2026: $359.5M
Q1 2021Q2 2026
13F filings of Horizon Investment Services, LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 6, 2026143$359.5MLRCXNVDAMUvs. Q1 2026SEC
Q1 2026May 15, 2026137$287.5MNVDAVanguard Scottsdale FDSGOOGLvs. Q4 2025SEC
Q4 2025Feb 13, 2026139$277.9MNVDAVanguard Scottsdale FDSGOOGLvs. Q3 2025SEC
Q3 2025Nov 5, 2025133$264.9MNVDAVanguard Scottsdale FDSAPPvs. Q2 2025SEC
Q2 2025Aug 6, 2025122$228.2MNVDAVanguard Scottsdale FDSMSFTvs. Q1 2025SEC
Q1 2025May 5, 2025110$205.9MNVDAVanguard Scottsdale FDSSPDR Series Trustvs. Q4 2024SEC
Q4 2024Feb 12, 2025123$235.2MNVDAAPPVanguard Scottsdale FDSvs. Q3 2024SEC
Q3 2024Nov 12, 2024122$234.0MNVDAVanguard Scottsdale FDSMSFTvs. Q2 2024SEC
Q2 2024Aug 5, 2024109$212.1MNVDAMSFTLRCXvs. Q1 2024SEC
Q1 2024May 7, 2024114$204.3MMSFTLRCXNVDAvs. Q4 2023SEC
Q4 2023Feb 12, 2024107$185.2MAAPLMSFTLRCXvs. Q3 2023SEC
Q3 2023Nov 13, 2023102$166.3MAAPLMSFTVanguard Scottsdale FDSvs. Q2 2023SEC
Q2 2023Aug 7, 2023104$163.7MAAPLMSFTVanguard Scottsdale FDSvs. Q1 2023SEC
Q1 2023May 9, 2023107$155.8MAAPLVanguard Scottsdale FDSMSFTvs. Q4 2022SEC
Q4 2022Feb 7, 2023101$137.8MAAPLVanguard Scottsdale FDSUNHvs. Q3 2022SEC
Q3 2022Nov 9, 202294$138.2MVanguard Scottsdale FDSAAPLUNHvs. Q2 2022SEC
Q2 2022Aug 11, 202298$151.1MVanguard Scottsdale FDSAAPLMSFTvs. Q1 2022SEC
Q1 2022May 10, 2022111$190.9MVanguard Scottsdale FDSAAPLMSFTvs. Q4 2021SEC
Q4 2021Feb 11, 2022120$218.4MVanguard Scottsdale FDSAAPLLRCXvs. Q3 2021SEC
Q3 2021Nov 12, 2021112$203.1MVanguard Scottsdale FDSAAPLMSFTvs. Q2 2021SEC
Q2 2021Aug 13, 2021113$203.7MVanguard Scottsdale FDSAAPLLRCXvs. Q1 2021SEC
Q1 2021May 14, 2021107$186.1MVanguard Scottsdale FDSAAPLLRCX–SEC