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

SecurityVOO / Vanguard Index Funds - Vanguard S&P 500 ETF
InstitutionCitigroup Inc
Latest Disclosed Ownership3,113,317 shares
Latest Disclosed Value $ 1,860,362,719
Citigroup Inc reports 1.36% decrease in ownership of VOO / Vanguard Index Funds - Vanguard S&P 500 ETF

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 3,113,317 shares of Vanguard Index Funds - Vanguard S&P 500 ETF (US:VOO) valued at $1,860,362,573 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,156,386 shares of Vanguard Index Funds - Vanguard S&P 500 ETF. This represents a change in shares of -1.36% during the quarter. The current value of the position is $2,167,055,431 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)
2026-05-11 2026-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,113,317 -43,069 -1.36 1,860,363 -6.02 0.7932
2026-02-13 2025-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,156,386 -76,880 -2.38 1,979,465 -0.03 0.8736
2025-11-10 2025-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,233,266 59,670 1.88 1,979,987 9.83 0.8827
2025-08-11 2025-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,173,596 580,500 22.39 1,802,698 35.27 0.8855
2025-05-12 2025-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,593,096 484,784 22.99 1,332,618 17.31 0.6811
2025-02-12 2024-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,108,312 -5,829 -0.28 1,135,979 1.83 0.6738
2024-11-12 2024-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,114,141 395,436 23.01 1,115,569 29.78 0.6461
2024-08-12 2024-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,718,705 52,059 3.12 859,576 7.29 0.5507
2024-05-10 2024-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,666,646 -209 -0.01 801,157 10.04 0.5262
2024-02-09 2023-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,666,855 198,942 13.55 728,082 26.30 0.5130
2023-12-06 2023-09-30 13F/A-1 VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,467,913 72,908 5.23 576,449 1.46 0.4309
2023-11-09 2023-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,467,913 72,908 576,449 0.1722
2023-08-10 2023-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,395,005 28,425 2.08 568,157 10.55 0.3725
2023-05-11 2023-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,366,580 53,122 4.04 513,930 11.37 0.3603
2023-02-09 2022-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,313,458 54,067 4.29 461,470 11.61 0.3675
2022-11-10 2022-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,259,391 55,652 4.62 413,458 -0.98 0.2959
2022-08-10 2022-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,203,739 95,572 8.62 417,553 -9.24 0.3108
2022-05-12 2022-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,108,167 17,074 1.56 460,078 -3.41 0.2797
2022-02-10 2021-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,091,093 33,481 3.17 476,339 14.20 0.2551
2021-11-10 2021-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,057,612 -18,247 -1.70 417,122 -1.48 0.2464
2021-08-10 2021-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,075,859 751,304 231.49 423,372 258.07 0.2548
2021-05-13 2021-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 324,555 111,394 52.26 118,236 61.39 0.0765
2021-02-11 2020-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 213,161 2,340 1.11 73,261 12.95 0.0432
2020-11-12 2020-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 210,821 11,260 5.64 64,860 14.67 0.0423
2020-08-12 2020-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 199,561 7,399 3.85 56,562 24.29 0.0441
2020-05-12 2020-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 192,162 -6,807 -3.42 45,507 -22.68 0.0411
2020-02-12 2019-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 198,969 15,002 8.15 58,855 17.36 0.0426
2019-11-08 2019-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 183,967 -29,909 -13.98 50,150 -12.88 0.0398
2019-08-12 2019-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 213,876 -27,916 -11.55 57,564 -8.27 0.0465
2019-05-13 2019-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 241,792 -3,767 -1.53 62,754 11.20 0.0605
2019-02-12 2018-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 245,559 66,738 37.32 56,432 18.17 0.0572
2018-11-13 2018-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 178,821 -1,368,700 -88.44 47,754 -87.63 0.0426
2018-08-10 2018-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,547,521 -98,835 -6.00 386,121 -3.12 0.3548
2018-05-11 2018-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,646,356 -137,809 -7.72 398,549 -8.93 0.3283
2018-02-12 2017-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,784,165 43,557 2.50 437,638 8.96 0.3508
2017-11-13 2017-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,740,608 167,666 10.66 401,662 14.99 0.3288
2017-08-11 2017-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,572,942 -148,834 -8.64 349,288 -6.23 0.3150
2017-05-12 2017-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 1,721,776 -1,545,183 -47.30 372,506 -44.46 0.3320
2017-02-10 2016-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 3,266,959 583,205 21.73 670,740 25.79 0.6044
2016-11-10 2016-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,683,754 232,853 9.50 533,235 13.19 0.4983
2016-08-12 2016-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,450,901 -137,736 -5.32 471,111 -3.48 0.4809
2016-05-13 2016-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,588,637 -80,829 -3.03 488,114 -2.18 0.5483
2016-02-12 2015-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,669,466 -123,546 -4.42 499,003 1.68 0.4973
2015-11-13 2015-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,793,012 137,561 5.18 490,760 -2.13 0.4593
2015-08-13 2015-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,655,451 -289,981 -9.85 501,456 -10.02 0.4454
2015-05-14 2015-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,945,432 116,062 4.10 557,276 4.52 0.5387
2015-02-17 2014-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,829,370 761,099 36.80 533,195 42.75 0.4762
2014-11-14 2014-09-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,068,271 30,885 1.52 373,509 2.17 0.3265
2014-08-14 2014-06-30 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,037,386 -538,097 -20.89 365,569 -17.16 0.3506
2014-05-15 2014-03-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,575,483 383,544 17.50 441,309 19.03 0.4511
2014-02-14 2013-12-31 13F VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 2,191,939 2,191,939 370,767 0.3357
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.