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Livermore
Livermore
ZHEN

Avenir Corp

SEC CIK
0001033475
Latest filing
Aug 13, 2026

The latest 13F from Avenir Corp covers Q2 2026 (filed Aug 13, 2026): 79 long positions worth $820.7M. The top 10 holdings make up 73.4% of the portfolio, and the largest is Microsoft Corp (MSFT) at 10.9%. 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
10
Est. +$3.17M
Added
9
Est. +$6.21M
Reduced
29
Est. −$21.0M
Sold out
3
Est. −$738.7K

Top 5 holdings

Share of this quarter's portfolio value

  1. MSFTMicrosoft Corp
    10.9%$89.4MHistory
  2. MKLMarkel Group Inc.
    10.5%$86.4MHistory
  3. AMZNAmazon Com Inc
    10.5%$85.9MHistory
  4. ORLYO Reilly Automotive Inc
    8.2%$67.3MHistory
  5. AMTAmerican Tower Corp
    8.1%$66.6MHistory

Biggest buys

New and added positions, by estimated amount bought

  1. WAYWaystar Holding Corp.
    +$3.52MAddedHistory
  2. ADBEAdobe Inc.
    +$1.83MAddedHistory
  3. DLTRDollar Tree, Inc.
    +$624.1KAddedHistory
  4. Vanguard Total World Stock ETF922042742
    +$551.4KNew
  5. DPZDominos Pizza Inc
    +$462.1KNewHistory

Largest weight increases

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

  1. ATOMAtomera Inc
    +0.88 pp0.7% → 1.6%History
  2. GOOGAlphabet Inc.
    +0.10 pp0.4% → 0.5%History
  3. DLTRDollar Tree, Inc.
    +0.08 pp<0.1% → 0.1%History
  4. Vanguard Total World Stock ETF922042742
    +0.07 pp0.0% → 0.1%
  5. DPZDominos Pizza Inc
    +0.06 pp0.0% → 0.1%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. AAPLApple Inc.
    −$3.97MReducedHistory
  2. AMZNAmazon Com Inc
    −$3.50MReducedHistory
  3. MKLMarkel Group Inc.
    −$3.16MReducedHistory
  4. ORLYO Reilly Automotive Inc
    −$1.71MReducedHistory
  5. MSFTMicrosoft Corp
    −$1.68MReducedHistory

Largest weight decreases

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

  1. CPRTCopart Inc
    −0.77 pp4.5% → 3.7%History
  2. AMTMAmentum Holdings, Inc.
    −0.63 pp2.7% → 2.0%History
  3. AMTAmerican Tower Corp
    −0.62 pp8.7% → 8.1%History
  4. LMTLockheed Martin Corp
    −0.41 pp2.4% → 1.9%History
  5. ERIIEnergy Recovery, Inc.
    −0.24 pp1.0% → 0.8%History

Metrics

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

Portfolio value
$820.7M
+$238.4K (0.0%) vs. prior quarter
Positions
79
+7 vs. prior quarter
Top 10 concentration
73.4%
Top 10 as share of value
Turnover
1.1%
Q2 2026, one quarter
Average holding period
20.3 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 $1.30B (Q4 2021)

Q1 2021: $1.16BQ2 2021: $1.26BQ3 2021: $1.19BQ4 2021: $1.30BQ1 2022: $1.25BQ2 2022: $1.05BQ3 2022: $943.2MQ4 2022: $997.7MQ1 2023: $1.06BQ2 2023: $1.14BQ3 2023: $1.07BQ4 2023: $1.16BQ1 2024: $1.17BQ2 2024: $1.03BQ3 2024: $991.7MQ4 2024: $976.8MQ1 2025: $953.0MQ2 2025: $972.9MQ3 2025: $960.1MQ4 2025: $921.7MQ1 2026: $820.5MQ2 2026: $820.7M
Q1 2021Q2 2026
13F filings of Avenir Corp by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 13, 202679$820.7MMSFTMKLAMZNvs. Q1 2026SEC
Q1 2026May 14, 202672$820.5MMSFTMKLAMZNvs. Q4 2025SEC
Q4 2025Feb 13, 202671$921.7MMSFTMKLAMZNvs. Q3 2025SEC
Q3 2025Nov 14, 202573$960.1MMSFTMKLAMZNvs. Q2 2025SEC
Q2 2025Aug 14, 202574$972.9MMSFTMKLAMTvs. Q1 2025SEC
Q1 2025May 14, 202570$953.0MMSFTAMTMKLvs. Q4 2024SEC
Q4 2024Feb 13, 202569$976.8MMSFTMKLAMZNvs. Q3 2024SEC
Q3 2024Nov 14, 202466$991.7MMSFTAMTMKLvs. Q2 2024SEC
Q2 2024Aug 14, 202467$1.03BMSFTMKLAMTvs. Q1 2024SEC
Q1 2024May 16, 202466$1.17BMSFTMKLAMTvs. Q4 2023SEC
Q4 2023Feb 14, 202462$1.16BMSFTAMTMKLvs. Q3 2023SEC
Q3 2023Nov 14, 202360$1.07BMSFTMKLAMTvs. Q2 2023SEC
Q2 2023Aug 11, 202360$1.14BMSFTMKLAMTvs. Q1 2023SEC
Q1 2023May 15, 202362$1.06BMSFTAMTMKLvs. Q4 2022SEC
Q4 2022Feb 14, 202364$997.7MAMTMSFTMKLvs. Q3 2022SEC
Q3 2022Nov 15, 202260$943.2MAMTMSFTMKLvs. Q2 2022SEC
Q2 2022Aug 11, 202263$1.05BAMTMSFTMKLvs. Q1 2022SEC
Q1 2022May 16, 202268$1.25BMSFTAMTMKLvs. Q4 2021SEC
Q4 2021Feb 16, 202271$1.30BAMTMSFTMKLvs. Q3 2021SEC
Q3 2021Nov 12, 202168$1.19BAMTMSFTMKLvs. Q2 2021SEC
Q2 2021Aug 13, 202167$1.26BAMTMSFTMKLvs. Q1 2021SEC
Q1 2021May 14, 202167$1.16BAMTMSFTMKL–SEC

13D and 13G filings

Companies where Avenir Corp reports owning 5% or more on Schedule 13D or 13G, and its latest filings.

Current stakes of 5% or more

1 company, largest stake first.

Companies where Avenir Corp owns 5% or more
CompanyLatest formStakeChangeFirst filedLatest filingFiling
CTSOCytosorbents Corp13G/A8.30%5.23M shares+2.60 ppfrom 5.70%Dec 13, 20219 filingsFeb 13, 2026SEC

Latest filings

10 filings on file made by Avenir Corp or listing it as a reporting person, newest first.

Schedule 13D and 13G filings by Avenir Corp
CompanyFiled (ET)FormStakeChangeEvent dateFiling
CTSOCytosorbents CorpFeb 13, 20265:56 PM ET13G/A8.30%5.23M shares+2.60 ppfrom 5.70%Dec 31, 2025SEC
CTSOCytosorbents CorpFeb 14, 202510:22 AM ET13G/A5.70%3.09M shares–Dec 31, 2024SEC
CTSOCytosorbents CorpFeb 14, 202413GOld format–––SEC
CTSOCytosorbents CorpFeb 14, 202313G/AOld format–––SEC
CTSOCytosorbents CorpAug 11, 202213GOld format–––SEC
CTSOCytosorbents CorpJun 28, 202213G/AOld format–––SEC
CTSOCytosorbents CorpApr 25, 202213GOld format–––SEC
CTSOCytosorbents CorpJan 7, 202213G/AOld format–––SEC
CTSOCytosorbents CorpDec 13, 202113GOld format–New–SEC
OPRXOptimizeRx CorpFeb 5, 202113G/AOld format–––SEC