Vanguard Index Funds - Vanguard Mid-Cap ETF
US ˙ ARCA ˙ US9229086296

SecurityVO / Vanguard Index Funds - Vanguard Mid-Cap ETF
InstitutionMillburn Ridgefield Corp
Latest Disclosed Ownership421,239 shares
Latest Disclosed Value $ 120,971,416
Millburn Ridgefield Corp reports 10.96% increase in ownership of VO / Vanguard Index Funds - Vanguard Mid-Cap ETF

On April 22, 2026 - Millburn Ridgefield Corp filed a 13F-HR form disclosing ownership of 421,239 shares of Vanguard Index Funds - Vanguard Mid-Cap ETF (US:VO) valued at $120,971,416 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 379,615 shares of Vanguard Index Funds - Vanguard Mid-Cap ETF. This represents a change in shares of 10.96% during the quarter. The current value of the position is $33,774,943 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-22 2026-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 421,239 41,624 10.96 120,971 9.80 2.6025
2026-02-02 2025-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 379,615 0 0.00 110,172 -1.20 2.6246
2025-10-30 2025-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 379,615 -24,579 -6.08 111,508 -1.41 2.6618
2025-07-29 2025-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 404,194 0 0.00 113,106 8.20 2.7229
2025-04-15 2025-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 404,194 -884 -0.22 104,533 -2.30 2.5327
2025-02-04 2024-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 405,078 20,624 5.36 106,993 5.48 2.6770
2024-11-14 2024-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 384,454 -21,077 -5.20 101,430 3.31 2.6588
2024-08-14 2024-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 405,531 19,523 5.06 98,179 1.80 2.6188
2024-04-26 2024-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 386,008 18,566 5.05 96,448 12.83 2.6707
2024-02-06 2023-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 367,442 -29,089 -7.34 85,482 3.52 2.6186
2023-11-02 2023-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 396,531 -432,630 -52.18 82,574 -54.77 2.6775
2023-07-21 2023-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 829,161 -2,902 -0.35 182,548 4.02 6.2395
2023-04-25 2023-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 832,063 17,038 2.09 175,499 105,621.69 6.1942
2023-01-20 2022-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 815,025 103,218 14.50 166 -99.88 6.3561
2022-11-03 2022-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 711,807 124,071 21.11 133,805 15.58 6.0529
2022-07-19 2022-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 587,736 138,674 30.88 115,766 8.39 6.2244
2022-04-21 2022-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 449,062 63,229 16.39 106,805 8.65 6.3251
2022-01-27 2021-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 385,833 15 0.00 98,299 7.61 6.2700
2021-10-21 2021-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 385,818 -4,871 -1.25 91,346 -1.49 6.4167
2021-07-16 2021-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 390,689 42,795 12.30 92,730 20.42 6.3813
2021-04-16 2021-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 347,894 -49,433 -12.44 77,003 -6.27 5.9533
2021-03-08 2020-12-31 13F/A-1 VANGUARD INDEX FDS MID CAP ETF 922908629 397,327 -72,875 -15.50 82,155 -0.87 6.2632
2021-01-28 2020-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 397,155 -73,047 82,120 6,280,750.7838
2021-03-08 2020-09-30 13F/A-1 VANGUARD INDEX FDS MID CAP ETF 922908629 470,202 -116,046 -19.79 82,878 -13.75 6.1532
2020-10-29 2020-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 470,140 -116,015 82,867 6,166,300.4355
2021-03-08 2020-06-30 13F/A-1 VANGUARD INDEX FDS MID CAP ETF 922908629 586,248 -199,040 -25.35 96,092 -7.05 6.3794
2020-07-28 2020-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 586,155 -199,133 96,077 6,387,677.9388
2021-03-11 2020-03-31 13F/A-1 VANGUARD INDEX FDS MID CAP ETF 922908629 785,288 -135,463 -14.71 103,383 -36.98 6.1801
2020-04-28 2020-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 785,288 -135,463 103,383 6,180,942.4677
2020-01-30 2019-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 920,751 -2,603 -0.28 164,059 6.01 6.3730
2019-10-31 2019-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 923,354 54,027 6.21 154,754 6.49 6.5509
2019-07-18 2019-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 869,327 42,181 5.10 145,317 9.29 6.1650
2019-04-18 2019-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 827,146 -69,025 -7.70 132,964 7.37 6.1671
2019-01-28 2018-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 896,171 58,638 7.00 123,833 -9.95 6.1922
2018-11-01 2018-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 837,533 -129,907 -13.43 137,515 -9.83 6.4089
2018-08-07 2018-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 967,440 0 0.00 152,507 2.22 7.5292
2018-05-01 2018-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 967,440 52,379 5.72 149,189 5.33 7.3944
2018-01-22 2017-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 915,061 -43,147 -4.50 141,633 0.55 7.4379
2017-10-23 2017-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 958,208 0 0.00 140,857 3.14 9.1083
2017-07-21 2017-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 958,208 0 0.00 136,564 2.36 9.4826
2017-04-28 2017-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 958,208 97,702 11.35 133,421 17.79 12.8656
2017-02-06 2016-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 860,506 860,506 113,268 16.5924
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.