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Livermore
Livermore
ZHEN

Millburn Ridgefield Corp

SEC CIK
0001294571
Latest filing
Jul 21, 2026

The latest 13F from Millburn Ridgefield Corp covers Q2 2026 (filed Jul 21, 2026): 39 long positions worth $5.28B. The top 10 holdings make up 73.6% of the portfolio, and the largest is iShares Core S&P Mid-Cap ETF at 12.8%. 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
0
Added
24
Est. +$111.0M
Reduced
12
Est. −$90.1M
Sold out
0

Top 5 holdings

Share of this quarter's portfolio value

  1. iShares Core S&P Mid-Cap ETF464287507
    12.8%$674.4M
  2. iShares Tr464287622
    12.7%$670.7M
  3. iShares Russell 2000 ETF464287655
    8.5%$448.1M
  4. iShares MSCI USA Min Vol Factor ETF46429B697
    8.1%$429.8M
  5. Vanguard Ftse Emerging Markets ETF922042858
    8.0%$421.1M

Share of portfolio

Top 5 holdings and the other 34 positions, by share of portfolio value

  1. iShares Core S&P Mid-Cap ETF12.8%
  2. iShares Tr12.7%
  3. iShares Russell 2000 ETF8.5%
  4. iShares MSCI USA Min Vol Factor ETF8.1%
  5. Vanguard Ftse Emerging Markets ETF8.0%
  6. Other 34 positions49.9%

Biggest buys

New and added positions, by estimated amount bought

  1. iShares Core S&P Mid-Cap ETF464287507
    +$35.8MAdded
  2. iShares MSCI USA Min Vol Factor ETF46429B697
    +$20.5MAdded
  3. SPYSPDR S&P 500 ETF Trust
    +$8.32MAddedHistory
  4. Vanguard S&P 500 ETF922908363
    +$4.26MAdded
  5. iShares Inc46434G822
    +$4.18MAdded

Largest weight increases

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

  1. iShares Core S&P Mid-Cap ETF464287507
    +0.74 pp12.0% → 12.8%
  2. SPYSPDR S&P 500 ETF Trust
    +0.23 pp7.3% → 7.6%History
  3. Vanguard S&P 500 ETF922908363
    +0.12 pp3.3% → 3.4%
  4. Vanguard Morningstar Large-Cap ETF922908637
    +0.11 pp2.9% → 3.0%
  5. Vanguard Morningstar Small-Cap ETF922908751
    +0.06 pp2.0% → 2.0%

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. iShares Russell 2000 ETF464287655
    −$33.8MReduced
  2. iShares Inc46434G772
    −$25.6MReduced
  3. iShares MSCI India ETF46429B598
    −$16.2MReduced
  4. Dimensional Emerging Core Equity Market ETF25434V302
    −$5.57MReduced
  5. iShares Core S&P Small Cap ETF464287804
    −$3.59MReduced

Largest weight decreases

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

  1. iShares MSCI India ETF46429B598
    −0.53 pp3.1% → 2.6%
  2. Vanguard Real Estate ETF922908553
    −0.14 pp2.7% → 2.5%
  3. iShares Russell 2000 ETF464287655
    −0.07 pp8.6% → 8.5%
  4. Dimensional Emerging Core Equity Market ETF25434V302
    −0.05 pp1.2% → 1.2%
  5. iShares Inc464286707
    −0.02 pp0.2% → 0.1%

Metrics

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

Portfolio value
$5.28B
+$633.8M (+13.6%) vs. prior quarter
Positions
39
0 vs. prior quarter
Top 10 concentration
73.6%
Top 10 as share of value
Turnover
1.8%
Q2 2026, one quarter
Average holding period
19.6 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 $5.28B (Q2 2026)

Q1 2021: $1.29BQ2 2021: $1.45BQ3 2021: $1.42BQ4 2021: $1.57BQ1 2022: $1.69BQ2 2022: $1.86BQ3 2022: $2.21BQ4 2022: $2.61BQ1 2023: $2.83BQ2 2023: $2.93BQ3 2023: $3.08BQ4 2023: $3.26BQ1 2024: $3.61BQ2 2024: $3.75BQ3 2024: $3.81BQ4 2024: $4.00BQ1 2025: $4.13BQ2 2025: $4.15BQ3 2025: $4.19BQ4 2025: $4.20BQ1 2026: $4.65BQ2 2026: $5.28B
Q1 2021Q2 2026
13F filings of Millburn Ridgefield Corp by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Jul 21, 202639$5.28BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q1 2026SEC
Q1 2026Apr 22, 202639$4.65BiShares TriShares Core S&P Mid-Cap ETFiShares Russell 2000 ETFvs. Q4 2025SEC
Q4 2025Feb 2, 202639$4.20BiShares TriShares Core S&P Mid-Cap ETFiShares MSCI USA Min Vol Factor ETFvs. Q3 2025SEC
Q3 2025Oct 30, 202538$4.19BiShares TriShares Core S&P Mid-Cap ETFiShares Russell 2000 ETFvs. Q2 2025SEC
Q2 2025Jul 29, 202538$4.15BiShares TriShares Core S&P Mid-Cap ETFiShares Russell 2000 ETFvs. Q1 2025SEC
Q1 2025Apr 15, 202549$4.13BiShares Core S&P Mid-Cap ETFiShares TriShares MSCI USA Min Vol Factor ETFvs. Q4 2024SEC
Q4 2024Feb 4, 202546$4.00BiShares TriShares Core S&P Mid-Cap ETFiShares Russell 2000 ETFvs. Q3 2024SEC
Q3 2024Nov 14, 2024247$3.81BiShares TriShares Core S&P Mid-Cap ETFiShares Russell 2000 ETFvs. Q2 2024SEC
Q2 2024Aug 14, 2024184$3.75BiShares TriShares Core S&P Mid-Cap ETFiShares Russell 2000 ETFvs. Q1 2024SEC
Q1 2024Apr 26, 2024182$3.61BiShares TriShares Core S&P Mid-Cap ETFiShares Russell 2000 ETFvs. Q4 2023SEC
Q4 2023Feb 6, 2024190$3.26BiShares Core S&P Mid-Cap ETFiShares TriShares MSCI USA Min Vol Factor ETFvs. Q3 2023SEC
Q3 2023Nov 2, 2023180$3.08BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q2 2023SEC
Q2 2023Jul 21, 202373$2.93BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q1 2023SEC
Q1 2023Apr 25, 2023128$2.83BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q4 2022SEC
Q4 2022Jan 20, 2023117$2.61BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q3 2022SEC
Q3 2022Nov 3, 2022114$2.21BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q2 2022SEC
Q2 2022Jul 19, 2022115$1.86BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q1 2022SEC
Q1 2022Apr 21, 2022126$1.69BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q4 2021SEC
Q4 2021Jan 27, 2022121$1.57BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q3 2021SEC
Q3 2021Oct 21, 2021131$1.42BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q2 2021SEC
Q2 2021Jul 16, 2021134$1.45BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETFvs. Q1 2021SEC
Q1 2021Apr 16, 202191$1.29BiShares Core S&P Mid-Cap ETFiShares TriShares Russell 2000 ETF–SEC