Costco Wholesale Corporation
DE ˙ XTRA ˙ US22160K1051
843,00 € ↑27,00 (3,31%)
2026-06-04
AKTIENPREIS
SecurityDE:CTO / Costco Wholesale Corporation
InstitutionUBS Group AG
Latest Disclosed Ownership2,480,387 shares
Latest Disclosed Value $ 2,471,531,858
UBS Group AG ownership in CTO / Costco Wholesale Corporation

On May 5, 2026 - UBS Group AG filed a 13F-HR form disclosing ownership of 2,480,387 shares of Costco Wholesale Corporation (DE:CTO) valued at $2,155,208,264 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 2,715,908 shares of Costco Wholesale Corporation. This represents a change in shares of -8.67% during the quarter. The current value of the position is $2,090,966,241 USD.

UBS Group AG has a history of taking positions in derivatives of the underlying security (CTO) in the form of stock options. The firm currently holds call options representing 43,210 of underlying shares valued at $43,055,740 USD and put options representing 49,700 of underlying shares valued at $49,522,571 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
(Premium Subscription Required)

In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

DE:CTO / Costco Wholesale Corporation Historical Put/Call Ratio
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)
2026-05-05 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 2,480,387 -235,521 -8.67 2,471,532 5.53 0.0692
2026-01-29 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,715,908 -141,654 -4.96 2,342,036 -11.46 0.3798
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,857,562 -80,977 -2.76 2,645,045 -9.07 0.4143
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 2,938,539 209,380 7.67 2,908,977 12.70 0.5036
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,729,159 64,556 2.42 2,581,184 5.72 0.4745
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,664,603 75,958 2.93 2,441,496 6.39 0.4512
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 2,588,645 26,172 1.02 2,294,885 5.36 0.5000
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,562,473 -110,775 -4.14 2,178,076 11.21 0.5381
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,673,248 -199,063 -6.93 1,958,502 3.30 0.4877
2024-02-09 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 2,872,311 153,122 5.63 1,895,955 23.42 0.5675
2023-11-09 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 2,719,189 -95,134 -3.38 1,536,233 1.39 0.5296
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 2,814,323 198,121 7.57 1,515,175 16.56 0.5116
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 2,616,202 55,590 2.17 1,299,912 11.21 0.4750
2023-02-08 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 2,560,612 349,147 15.79 1,168,919 11.92 0.4365
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 2,211,465 -103,961 -4.49 1,044,410 -5.89 0.4579
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 2,315,426 -262,888 -10.20 1,109,736 -25.26 0.4557
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 2,578,314 -6,681 -0.26 1,484,723 1.17 0.4950
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 2,584,995 -67,356 -2.54 1,467,503 23.13 0.4203
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,652,351 109,827 4.32 1,191,835 18.47 0.3753
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 2,542,524 5,564 0.22 1,006,001 12.50 0.3243
2021-05-12 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 2,536,960 -58,596 -2.26 894,228 -8.56 0.2968
2021-02-11 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 2,595,556 67,122 2.65 977,954 8.95 0.3306
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 2,528,434 -472,478 -15.74 897,595 -1.35 0.3383
2020-07-31 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 3,000,912 -42,349 -1.39 909,907 4.86 0.3842
2020-05-01 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 3,043,261 -224,702 -6.88 867,725 -9.66 0.4089
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 3,267,963 100,022 3.16 960,519 5.24 0.3342
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 3,167,941 -289,343 -8.37 912,716 -0.10 0.3514
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 3,457,284 375,908 12.20 913,622 22.45 0.3519
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 3,081,376 1,584,769 105.89 746,125 144.73 0.3082
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 1,496,607 -80,993 -5.13 304,873 -17.72 0.1383
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 1,577,600 110,502 7.53 370,546 20.86 0.1469
2018-08-14 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 1,467,098 -76,608 -4.96 306,594 5.40 0.1328
2018-05-15 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 1,543,706 -87,173 -5.35 290,881 -4.17 0.1256
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 1,630,879 163,140 11.12 303,540 25.88 0.1247
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 1,467,739 162,401 12.44 241,133 15.51 0.1115
2017-11-14 2017-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,305,338 213,275 19.53 208,763 14.00 0.1080
2017-08-14 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 1,305,338 208,763
2017-11-14 2017-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,092,063 6,369 0.59 183,129 5.35 0.0999
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 1,092,063 183,129
2017-02-14 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 1,085,694 81,553 8.12 173,831 13.51 0.0960
2016-11-14 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 1,004,141 -2,091 -0.21 153,142 -3.09 0.0913
2016-08-12 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 1,006,232 75,904 8.16 158,018 7.79 0.0993
2016-05-12 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 930,328 -57,410 -5.81 146,601 -8.10 0.0982
2016-02-16 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 987,738 162,249 19.65 159,519 33.67 0.1036
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 825,489 -118,105 -12.52 119,342 -6.36 0.0845
2015-08-14 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 943,594 47,078 5.25 127,442 -6.17 0.0847
2015-05-14 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 896,516 -61,365 -6.41 135,817 0.03 0.0938
2015-02-17 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 957,881 957,881 135,779 0.0949
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-05 2026-03-31 13F COSTCO WHOLESALE COM Call 43,210 2.86 43,056 18.85 n/a n/a n/a
2026-01-29 2025-12-31 13F COSTCO WHSL CORP COM Call 42,008 -7.61 36,225 -13.92 n/a n/a n/a
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM Call 45,466 -21.21 42,085 -26.33 n/a n/a n/a
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM Call 57,706 10.96 57,125 16.14 n/a n/a n/a
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM Call 52,006 -59.53 49,186 -58.23 n/a n/a n/a
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM Call 128,506 -21.74 117,746 -19.11 n/a n/a n/a
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM Call 164,200 17.03 145,567 22.06 n/a n/a n/a
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM Call 140,300 -23.08 119,254 -10.76 n/a n/a n/a
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM Call 182,400 55.31 133,632 72.38 n/a n/a n/a
2024-02-09 2023-12-31 13F COSTCO WHSL CORP COM Call 117,440 43.22 77,520 67.33 n/a n/a n/a
2023-11-09 2023-09-30 13F COSTCO WHSL CORP COM Call 82,000 215.38 46,327 230.97 n/a n/a n/a
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM Call 26,000 -50.85 13,998 -46.75 n/a n/a n/a
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM Call 52,900 -24.43 26,284 -17.75 n/a n/a n/a
2023-02-08 2022-12-31 13F COSTCO WHSL CORP COM Call 70,000 59.09 31,955 53.78 n/a n/a n/a
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM Call 44,000 129.17 20,780 125.82 n/a n/a n/a
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM Call 19,200 231.03 9,202 175.51 n/a n/a n/a
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM Call 5,800 -87.34 3,340 -87.15 n/a n/a n/a
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM Call 45,800 52.34 26,001 92.46 n/a n/a n/a
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM Call 30,065 6.75 13,510 21.23 n/a n/a n/a
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM Call 28,165 133.44 11,144 162.03 n/a n/a n/a
2021-05-12 2021-03-31 13F COSTCO WHSL CORP COM Call 12,065 -75.87 4,253 -77.42 n/a n/a n/a
2021-02-11 2020-12-31 13F COSTCO WHSL CORP COM Call 50,000 68.92 18,839 79.28 n/a n/a n/a
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM Call 29,600 341.79 10,508 417.38 n/a n/a n/a
2020-07-31 2020-06-30 13F COSTCO WHSL CORP COM Call 6,700 272.22 2,031 295.91 n/a n/a n/a
2020-05-01 2020-03-31 13F COSTCO WHSL CORP COM Call 1,800 -96.50 513 -96.61 n/a n/a n/a
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM Call 51,500 126.87 15,137 131.45 n/a n/a n/a
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM Call 22,700 0.00 6,540 9.02 n/a n/a n/a
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM Call 22,700 22,600.00 5,999 24,895.83 n/a n/a n/a
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM Call 100 -99.60 24 -99.53 n/a n/a n/a
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM Call 25,000 -38.73 5,093 -46.85 n/a n/a n/a
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM Call 40,800 353.33 9,583 409.46 n/a n/a n/a
2018-08-14 2018-06-30 13F COSTCO WHSL CORP COM Call 9,000 -65.12 1,881 -61.30 n/a n/a n/a
2018-05-15 2018-03-31 13F COSTCO WHSL CORP COM Call 25,800 186.67 4,861 158.43 n/a n/a n/a
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM Call 30,000 4,929 n/a n/a n/a
2017-11-14 2017-06-30 13F/A COSTCO WHSL CORP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-11-14 2017-03-31 13F/A COSTCO WHSL CORP COM Call 11,500 -18.44 1,928 -14.61 n/a n/a n/a
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM Call 11,500 1,928 n/a n/a n/a
2017-02-14 2016-12-31 13F COSTCO WHSL CORP COM Call 14,100 22.61 2,258 17.12 n/a n/a n/a
2016-05-12 2016-03-31 13F COSTCO WHSL CORP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-16 2015-12-31 13F COSTCO WHSL CORP COM Call 7,900 -58.20 1,276 -53.29 n/a n/a n/a
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM Call 18,900 73.39 2,732 85.60 n/a n/a n/a
2015-08-14 2015-06-30 13F COSTCO WHSL CORP COM Call 10,900 -32.30 1,472 -39.65 n/a n/a n/a
2015-05-14 2015-03-31 13F COSTCO WHSL CORP COM Call 16,100 -22.60 2,439 -17.27 n/a n/a n/a
2015-02-17 2014-12-31 13F COSTCO WHSL CORP COM Call 20,800 2,948 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-05 2026-03-31 13F COSTCO WHOLESALE COM Put 49,700 -11.88 49,523 1.82 n/a n/a n/a
2026-01-29 2025-12-31 13F COSTCO WHSL CORP COM Put 56,400 22.61 48,636 14.23 n/a n/a n/a
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM Put 46,000 -38.91 42,579 -42.88 n/a n/a n/a
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM Put 75,300 -45.00 74,542 -42.43 n/a n/a n/a
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM Put 136,900 -42.74 129,477 -40.90 n/a n/a n/a
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM Put 239,100 15.40 219,080 19.27 n/a n/a n/a
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM Put 207,200 -3.31 183,687 0.84 n/a n/a n/a
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM Put 214,300 26.73 182,153 47.03 n/a n/a n/a
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM Put 169,100 13.91 123,888 26.42 n/a n/a n/a
2024-02-09 2023-12-31 13F COSTCO WHSL CORP COM Put 148,457 45.55 97,993 70.05 n/a n/a n/a
2023-11-09 2023-09-30 13F COSTCO WHSL CORP COM Put 102,000 161.54 57,626 174.46 n/a n/a n/a
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM Put 39,000 -44.29 20,997 -39.63 n/a n/a n/a
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM Put 70,000 -12.83 34,781 -5.12 n/a n/a n/a
2023-02-08 2022-12-31 13F COSTCO WHSL CORP COM Put 80,300 21.12 36,657 17.07 n/a n/a n/a
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM Put 66,300 139.35 31,311 135.85 n/a n/a n/a
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM Put 27,700 -35.43 13,276 -46.26 n/a n/a n/a
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM Put 42,900 -84.39 24,704 -84.16 n/a n/a n/a
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM Put 274,800 43.43 156,004 81.21 n/a n/a n/a
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM Put 191,594 106.92 86,092 134.99 n/a n/a n/a
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM Put 92,594 -13.13 36,636 -2.49 n/a n/a n/a
2021-05-12 2021-03-31 13F COSTCO WHSL CORP COM Put 106,594 5.75 37,572 -1.07 n/a n/a n/a
2021-02-11 2020-12-31 13F COSTCO WHSL CORP COM Put 100,800 93.85 37,980 105.74 n/a n/a n/a
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM Put 52,000 15.81 18,460 35.60 n/a n/a n/a
2020-07-31 2020-06-30 13F COSTCO WHSL CORP COM Put 44,900 2,038.10 13,614 2,172.79 n/a n/a n/a
2020-05-01 2020-03-31 13F COSTCO WHSL CORP COM Put 2,100 -98.37 599 -98.42 n/a n/a n/a
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM Put 128,800 -1.38 37,857 0.61 n/a n/a n/a
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM Put 130,600 -25.24 37,627 -18.50 n/a n/a n/a
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM Put 174,700 15.54 46,166 26.10 n/a n/a n/a
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM Put 151,200 53.50 36,612 82.46 n/a n/a n/a
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM Put 98,500 36.62 20,066 18.49 n/a n/a n/a
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM Put 72,100 0.70 16,935 13.18 n/a n/a n/a
2018-08-14 2018-06-30 13F COSTCO WHSL CORP COM Put 71,600 -31.02 14,963 -23.50 n/a n/a n/a
2018-05-15 2018-03-31 13F COSTCO WHSL CORP COM Put 103,800 -43.59 19,559 -42.89 n/a n/a n/a
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM Put 184,000 6.91 34,246 21.12 n/a n/a n/a
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM Put 172,100 3.55 28,274 6.37 n/a n/a n/a
2017-11-14 2017-06-30 13F/A COSTCO WHSL CORP COM Put 166,200 1,562.00 26,580 1,484.97 n/a n/a n/a
2017-08-14 2017-06-30 13F COSTCO WHSL CORP COM Put 166,200 26,580 n/a n/a n/a
2017-11-14 2017-03-31 13F/A COSTCO WHSL CORP COM Put 10,000 1,677 n/a n/a n/a
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM Put 10,000 1,677 n/a n/a n/a
2016-08-12 2016-06-30 13F COSTCO WHSL CORP COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2016-05-12 2016-03-31 13F COSTCO WHSL CORP COM Put 500 -98.61 79 -98.64 n/a n/a n/a
2016-02-16 2015-12-31 13F COSTCO WHSL CORP COM Put 35,900 -55.79 5,798 -50.61 n/a n/a n/a
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM Put 81,200 -1.58 11,739 5.36 n/a n/a n/a
2015-08-14 2015-06-30 13F COSTCO WHSL CORP COM Put 82,500 -23.40 11,142 -31.71 n/a n/a n/a
2015-05-14 2015-03-31 13F COSTCO WHSL CORP COM Put 107,700 148.16 16,316 165.21 n/a n/a n/a
2015-02-17 2014-12-31 13F COSTCO WHSL CORP COM Put 43,400 6,152 n/a n/a n/a
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.