Vanguard Index Funds - Vanguard S&P 500 ETF
US ˙ ARCA ˙ US9229083632

SecurityVOO / Vanguard Index Funds - Vanguard S&P 500 ETF
InstitutionParthenon Llc
Latest Disclosed Ownership14,995 shares
Latest Disclosed Value $ 8,960,262
Parthenon Llc reports 3.56% increase in ownership of VOO / Vanguard Index Funds - Vanguard S&P 500 ETF

On April 28, 2026 - Parthenon Llc filed a 13F-HR form disclosing ownership of 14,995 shares of Vanguard Index Funds - Vanguard S&P 500 ETF (US:VOO) valued at $8,960,262 USD as of March 31, 2026. The current value of the position is $10,166,610 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)
2026-04-28 2026-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 14,995 515 3.56 8,960 -1.32 1.0244
2026-01-23 2025-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 14,480 -660 -4.36 9,081 -2.06 0.9799
2025-10-31 2025-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 15,140 805 5.62 9,271 13.87 1.0273
2025-07-29 2025-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 14,335 272 1.93 8,143 12.66 0.9315
2025-05-02 2025-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 14,063 -100 -0.71 7,227 -5.29 0.8888
2025-02-03 2024-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 14,163 490 3.58 7,631 5.78 0.9231
2024-11-05 2024-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 13,673 970 7.64 7,215 13.55 0.8616
2024-08-08 2024-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 12,703 -15 -0.12 6,353 3.93 0.8070
2024-04-30 2024-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 12,718 67 0.53 6,114 10.64 0.7750
2024-02-05 2023-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 12,651 1,543 13.89 5,526 26.66 0.7639
2023-10-30 2023-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 11,108 -15 -0.13 4,362 -3.71 0.6545
2023-07-27 2023-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 11,123 -22 -0.20 4,530 8.09 0.6544
2023-05-08 2023-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 11,145 652 6.21 4,191 13.70 0.6414
2023-02-08 2022-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 10,493 819 8.47 3,687 16.06 0.6047
2022-11-01 2022-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 9,674 1,570 19.37 3,176 12.98 0.5732
2022-07-29 2022-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 8,104 1,053 14.93 2,811 -3.96 0.4767
2022-05-09 2022-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 7,051 102 1.47 2,927 -3.53 0.4243
2022-02-07 2021-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,949 -149 -2.10 3,034 8.40 0.4256
2021-10-28 2021-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 7,098 450 6.77 2,799 7.00 0.4206
2021-07-28 2021-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,648 250 3.91 2,616 12.23 0.3919
2021-04-23 2021-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,398 75 1.19 2,331 7.27 0.3749
2021-02-03 2020-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,323 0 0.00 2,173 11.72 0.3747
2020-10-29 2020-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,323 0 0.00 1,945 8.54 0.3773
2020-07-24 2020-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,323 132 2.13 1,792 22.24 0.3721
2020-04-28 2020-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,191 -191 -2.99 1,466 -22.35 0.3489
2020-01-28 2019-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 6,382 479 8.11 1,888 17.34 0.3769
2019-10-31 2019-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 5,903 412 7.50 1,609 8.86 0.3441
2019-07-29 2019-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 5,491 385 7.54 1,478 11.55 0.3170
2019-05-03 2019-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 5,106 654 14.69 1,325 29.52 0.2962
2019-01-29 2018-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 4,452 255 6.08 1,023 -8.74 0.2519
2018-11-14 2018-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 4,197 140 3.45 1,121 10.77 0.2463
2018-08-02 2018-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 4,057 812 25.02 1,012 28.75 0.2334
2018-05-03 2018-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,245 0 0.00 786 -1.26 0.1851
2018-02-05 2017-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,245 70 2.20 796 8.59 0.1794
2017-10-31 2017-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,175 506 18.96 733 23.61 0.1730
2017-07-21 2017-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,669 240 9.88 593 12.74 0.1410
2017-05-05 2017-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,429 290 13.56 526 19.82 0.1248
2017-02-01 2016-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,139 85 4.14 439 7.60 0.1079
2016-11-07 2016-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,054 200 10.79 408 14.61 0.1013
2016-07-26 2016-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,854 1,854 356 0.0893
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.