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

SecurityVO / Vanguard Index Funds - Vanguard Mid-Cap ETF
InstitutionHarbor Advisory Corp /ma/
Latest Disclosed Ownership24,924 shares
Latest Disclosed Value $ 7,157,674
Harbor Advisory Corp /ma/ reports 29.09% decrease in ownership of VO / Vanguard Index Funds - Vanguard Mid-Cap ETF

On May 7, 2026 - Harbor Advisory Corp /ma/ filed a 13F-HR form disclosing ownership of 24,924 shares of Vanguard Index Funds - Vanguard Mid-Cap ETF (US:VO) valued at $7,157,674 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 35,147 shares of Vanguard Index Funds - Vanguard Mid-Cap ETF. This represents a change in shares of -29.09% during the quarter. The current value of the position is $1,982,704 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)
2026-05-07 2026-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 24,924 -10,223 -29.09 7,158 -29.83 2.1509
2026-02-06 2025-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 35,147 1,488 4.42 10,200 3.18 3.0857
2025-11-12 2025-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 33,659 1,155 3.55 9,887 8.70 2.9238
2025-08-12 2025-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 32,504 1,185 3.78 9,096 12.30 2.8982
2025-05-13 2025-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 31,319 1,423 4.76 8,100 2.57 2.7188
2025-01-29 2024-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 29,896 4,246 16.55 7,896 16.68 2.5938
2024-10-21 2024-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 25,650 272 1.07 6,767 10.14 2.2088
2024-07-25 2024-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 25,378 97 0.38 6,144 -2.72 2.1219
2024-04-29 2024-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 25,281 50 0.20 6,317 7.62 2.1502
2024-02-05 2023-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 25,231 -178 -0.70 5,870 10.92 2.1016
2023-10-27 2023-09-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 25,409 1,140 4.70 5,291 -0.97 1.9176
2023-08-03 2023-06-30 13F VANGUARD INDEX FDS MID CAP ETF 922908629 24,269 894 3.82 5,343 8.38 1.8863
2023-05-04 2023-03-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 23,375 125 0.54 4,930 4.05 1.8824
2023-02-07 2022-12-31 13F VANGUARD INDEX FDS MID CAP ETF 922908629 23,250 4,662 25.08 4,739 35.60 1.9358
2022-10-31 2022-09-30 13F VANGUARD MID CAP EF 922908629 18,588 29 0.16 3,494 -4.43 1.6091
2022-08-01 2022-06-30 13F VANGUARD MID CAP EF 922908629 18,559 890 5.04 3,656 -12.99 1.6022
2022-05-13 2022-03-31 13F VANGUARD MID CAP EF 922908629 17,669 1,616 10.07 4,202 2.74 1.6863
2022-02-07 2021-12-31 13F VANGUARD MID CAP EF 922908629 16,053 1,106 7.40 4,090 15.57 1.6589
2021-11-12 2021-09-30 13F VANGUARD MID CAP EF 922908629 14,947 815 5.77 3,539 5.52 1.5354
2021-08-04 2021-06-30 13F VANGUARD MID CAP EF 922908629 14,132 857 6.46 3,354 14.16 1.5120
2021-05-13 2021-03-31 13F VANGUARD MID CAP EF 922908629 13,275 725 5.78 2,938 13.22 1.1679
2021-02-16 2020-12-31 13F VANGUARD MID CAP EF 922908629 12,550 608 5.09 2,595 23.28 1.3735
2020-10-26 2020-09-30 13F VANGUARD MID-CAP ETF EF 922908629 11,942 -15 -0.13 2,105 7.40 2.0640
2020-08-04 2020-06-30 13F VANGUARD MID-CAP ETF EF 922908629 11,957 -12,630 -51.37 1,960 -39.45 1.9858
2020-04-28 2020-03-31 13F VANGUARD MID-CAP ETF EF 922908629 24,587 975 4.13 3,237 -23.06 3.4711
2020-02-05 2019-12-31 13F VANGUARD MID-CAP ETF EF 922908629 23,612 -325 -1.36 4,207 4.86 3.5001
2019-10-28 2019-09-30 13F VANGUARD MID-CAP ETF EF 922908629 23,937 295 1.25 4,012 1.52 3.5019
2019-07-30 2019-06-30 13F VANGUARD MID-CAP ETF EF 922908629 23,642 165 0.70 3,952 4.72 3.4888
2019-04-23 2019-03-31 13F VANGUARD MID-CAP ETF EF 922908629 23,477 1,320 5.96 3,774 23.25 3.3736
2019-02-05 2018-12-31 13F VANGUARD MID-CAP ETF EF 922908629 22,157 -140 -0.63 3,062 -16.36 3.0302
2018-10-17 2018-09-30 13F VANGUARD MID-CAP ETF EF 922908629 22,297 125 0.56 3,661 4.75 3.1699
2018-07-23 2018-06-30 13F VANGUARD MID-CAP ETF EF 922908629 22,172 865 4.06 3,495 6.36 3.1370
2018-05-07 2018-03-31 13F VANGUARD MID-CAP ETF EF 922908629 21,307 3,930 22.62 3,286 22.16 3.0107
2018-01-30 2017-12-31 13F VANGUARD MID-CAP ETF EF 922908629 17,377 17,377 2,690 2.5708
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.