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

SecurityVO / Vanguard Index Funds - Vanguard Mid-Cap ETF
InstitutionFirst Manhattan Co
Latest Disclosed Ownership156,396 shares
Latest Disclosed Value $ 44,913,891
First Manhattan Co reports 12.65% increase in ownership of VO / Vanguard Index Funds - Vanguard Mid-Cap ETF

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 156,396 shares of Vanguard Index Funds - Vanguard Mid-Cap ETF (US:VO) valued at $44,913,803 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 138,832 shares of Vanguard Index Funds - Vanguard Mid-Cap ETF. This represents a change in shares of 12.65% during the quarter. The current value of the position is $12,441,302 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)
2026-05-15 2026-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 156,396 17,564 12.65 44,914 11.47 0.1245
2026-02-17 2025-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 138,832 25,659 22.67 40,292 20.78 0.1058
2025-11-14 2025-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 113,173 -3,581 -3.07 33,360 1.72 0.0881
2025-08-14 2025-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 116,754 6,628 6.02 32,796 15.15 0.0926
2025-05-15 2025-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 110,126 715 0.65 28,481 -1.45 0.0831
2025-02-14 2024-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 109,411 616 0.57 28,899 0.68 0.0848
2024-11-14 2024-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 108,795 -3,616 -3.22 28,703 5.07 0.0851
2024-08-15 2024-06-30 13F/A-1 VANGUARD INDEX FDS MID CAP ETF 922908629 112,411 400 0.36 27,319 -2.39 0.0876
2024-08-14 2024-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 112,411 400 27,319 0.0876
2024-05-15 2024-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 112,011 2,192 2.00 27,989 9.55 0.0907
2024-02-13 2023-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 109,819 8,896 8.81 25,549 21.57 0.0886
2023-11-14 2023-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 100,923 97,875 3,211.12 21,016 3,032.04 0.0776
2023-08-14 2023-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 3,048 -1,399 -31.46 671 -28.39 0.0025
2023-05-15 2023-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 4,447 -783 -14.97 938 -12.02 0.0036
2023-02-14 2022-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 5,230 447 9.35 1,066 18.46 0.0039
2022-11-14 2022-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 4,783 816 20.57 899 15.11 0.0038
2022-08-15 2022-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 3,967 -845 -17.56 781 -31.73 0.0031
2022-05-16 2022-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 4,812 138 2.95 1,144 -3.87 0.0037
2022-02-14 2021-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 4,674 909 24.14 1,190 33.56 0.0039
2021-11-15 2021-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 3,765 0 0.00 891 -0.22 0.0033
2021-08-16 2021-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 3,765 -42 -1.10 893 6.06 0.0033
2021-05-14 2021-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 3,807 -198 -4.94 842 1.69 0.0036
2021-02-16 2020-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 4,005 325 8.83 828 27.78 0.0040
2020-11-12 2020-09-30 13F VANGUARD INDEX TR MID CAP 922908629 3,680 -510 -12.17 648 -5.54 0.0033
2020-08-14 2020-06-30 13F VANGUARD INDEX TR MID CAP 922908629 4,190 530 14.48 686 42.62 0.0040
2020-05-06 2020-03-31 13F VANGUARD INDEX TR MID CAP 922908629 3,660 633 20.91 481 -10.76 0.0031
2020-02-13 2019-12-31 13F VANGUARD INDEX TR MID CAP 922908629 3,027 -40 -1.30 539 4.86 0.0027
2019-11-13 2019-09-30 13F VANGUARD INDEX TR MID CAP 922908629 3,067 -3 -0.10 514 0.19 0.0028
2019-08-16 2019-06-30 13F VANGUARD INDEX TR MID CAP 922908629 3,070 35 1.15 513 5.34 0.0028
2019-04-12 2019-03-31 13F VANGUARD INDEX TR MID CAP 922908629 3,035 0 0.00 487 16.23 0.0028
2019-01-30 2018-12-31 13F VANGUARD INDEX TR MID CAP 922908629 3,035 -1,665 -35.43 419 -45.65 0.0026
2018-10-15 2018-09-30 13F VANGUARD INDEX TR MID CAP 922908629 4,700 0 0.00 771 4.19 0.0041
2018-08-01 2018-06-30 13F VANGUARD INDEX TR MID CAP 922908629 4,700 190 4.21 740 6.47 0.0043
2018-04-20 2018-03-31 13F VANGUARD INDEX TR MID CAP 922908629 4,510 2,925 184.54 695 183.67 0.0040
2018-01-22 2017-12-31 13F VANGUARD INDEX TR MID CAP 922908629 1,585 1,335 534.00 245 580.56 0.0013
2017-10-25 2017-09-30 13F VANGUARD INDEX TR MID CAP 922908629 250 0 0.00 36 2.86 0.0002
2017-08-10 2017-06-30 13F/A-2 VANGUARD INDEX TR MID CAP 922908629 250 0 0.00 35 2.94 0.0002
2017-08-01 2017-06-30 13F/A-1 VANGUARD INDEX TR MID CAP 922908629 250 0 35 0.0002
2017-07-28 2017-06-30 13F VANGUARD INDEX TR MID CAP 922908629 250 0 35
2017-04-25 2017-03-31 13F/A-1 VANGUARD INDEX TR MID CAP 922908629 250 0 0.00 34 6.25 0.0002
2017-04-24 2017-03-31 13F VANGUARD INDEX TR MID CAP 922908629 250 32
2017-01-25 2016-12-31 13F VANGUARD INDEX TR MID CAP 922908629 250 0 0.00 32 0.00 0.0002
2016-10-20 2016-09-30 13F VANGUARD INDEX TR MID CAP 922908629 250 250 32 0.0002
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.