Vicor Corporation
US ˙ NasdaqGS ˙ US9258151029

SecurityVICR / Vicor Corporation
InstitutionState Street Corp
Latest Disclosed Ownership811,617 shares
Latest Disclosed Value $ 130,670,337
State Street Corp reports 3.03% decrease in ownership of VICR / Vicor Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 811,617 shares of Vicor Corporation (US:VICR) valued at $130,670,337 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 836,955 shares of Vicor Corporation. This represents a change in shares of -3.03% during the quarter. The current value of the position is $248,452,196 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.

Upgrade to unlock premium data and export to Excel .

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 VICOR COM 925815102 811,617 -25,338 -3.03 130,670 42.45 0.0045
2026-02-13 2025-12-31 13F VICOR COM 925815102 836,955 -14,265 -1.68 91,730 116.74 0.0031
2025-11-14 2025-09-30 13F VICOR COM 925815102 851,220 2,870 0.34 42,323 9.98 0.0015
2025-08-14 2025-06-30 13F VICOR COM 925815102 848,350 -13,195 -1.53 38,481 -4.52 0.0014
2025-05-15 2025-03-31 13F VICOR COM 925815102 861,545 -25,419 -2.87 40,303 -5.96 0.0017
2025-02-14 2024-12-31 13F VICOR COM 925815102 886,964 34,032 3.99 42,858 19.36 0.0017
2024-11-14 2024-09-30 13F VICOR COM 925815102 852,932 17,668 2.12 35,908 29.65 0.0015
2024-08-14 2024-06-30 13F VICOR COM 925815102 835,264 -11,347 -1.34 27,697 -14.45 0.0012
2024-05-15 2024-03-31 13F VICOR COM 925815102 846,611 11,904 1.43 32,374 -13.69 0.0014
2024-02-14 2023-12-31 13F VICOR COM 925815102 834,707 96,134 13.02 37,512 -13.76 0.0018
2023-11-14 2023-09-30 13F VICOR COM 925815102 738,573 7,747 1.06 43,495 10.21 0.0024
2023-08-14 2023-06-30 13F VICOR COM 925815102 730,826 9,978 1.38 39,465 16.63 0.0021
2023-05-15 2023-03-31 13F VICOR COM 925815102 720,848 15,895 2.25 33,837 -10.70 0.0019
2023-05-15 2022-12-31 13F/A-99 VICOR COM 925815102 704,953 29,113 4.31 37,891 -5.20 0.0022
2023-05-15 2022-12-31 13F VICOR COM 925815102 704,953 29,113 37,891 0.0022
2022-11-15 2022-09-30 13F VICOR COM 925815102 675,840 16,071 2.44 39,969 10.69 0.0025
2022-08-15 2022-06-30 13F VICOR COM 925815102 659,769 6,898 1.06 36,109 -21.60 0.0022
2022-05-16 2022-03-31 13F VICOR COM 925815102 652,871 15,683 2.46 46,060 -43.07 0.0023
2022-02-14 2021-12-31 13F VICOR COM 925815102 637,188 -2,798 -0.44 80,910 -5.77 0.0038
2021-11-15 2021-09-30 13F VICOR COM 925815102 639,986 8,790 1.39 85,861 28.64 0.0045
2021-08-16 2021-06-30 13F VICOR COM 925815102 631,196 43,434 7.39 66,743 33.55 0.0035
2021-07-09 2021-03-31 13F/A-1 VICOR COM 925815102 587,762 4,055 0.69 49,977 -7.16 0.0029
2021-05-17 2021-03-31 13F VICOR COM 925815102 587,762 4,055 49,977 0.0029
2021-02-16 2020-12-31 13F VICOR COM 925815102 583,707 7,859 1.36 53,829 20.26 0.0033
2020-11-10 2020-09-30 13F VICOR COM 925815102 575,848 18,212 3.27 44,761 11.56 0.0031
2020-08-14 2020-06-30 13F VICOR COM 925815102 557,636 13,782 2.53 40,122 65.64 0.0029
2020-06-19 2020-03-31 13F/A-1 VICOR COM 925815102 543,854 31,627 6.17 24,223 1.22 0.0021
2020-05-11 2020-03-31 13F VICOR COM 925815102 543,854 31,627 24,223 2,127.2671
2020-02-06 2019-12-31 13F VICOR COM 925815102 512,227 8,270 1.64 23,931 60.86 0.0016
2019-11-14 2019-09-30 13F VICOR COM 925815102 503,957 12,452 2.53 14,877 -2.52 0.0011
2019-08-14 2019-06-30 13F VICOR COM 925815102 491,505 8,835 1.83 15,261 1.93 0.0011
2019-05-15 2019-03-31 13F VICOR COM 925815102 482,670 22,446 4.88 14,972 -13.91 0.0012
2019-02-12 2018-12-31 13F VICOR COM 925815102 460,224 -13,066 -2.76 17,392 -20.12 0.0016
2018-11-09 2018-09-30 13F VICOR Common equity shares 925815102 473,290 23,454 5.21 21,774 11.15 0.0017
2018-08-14 2018-06-30 13F VICOR Common equity shares 925815102 449,836 10,958 2.50 19,589 56.36 0.0016
2018-05-15 2018-03-31 13F VICOR Common equity shares 925815102 438,878 -3,024 -0.68 12,528 35.60 0.0011
2018-02-14 2017-12-31 13F VICOR Common equity shares 925815102 441,902 16,069 3.77 9,239 -8.09 0.0007
2017-11-14 2017-09-30 13F VICOR Common equity shares 925815102 425,833 -5,546 -1.29 10,052 30.17 0.0009
2017-08-14 2017-06-30 13F VICOR Common equity shares 925815102 431,379 28,222 7.00 7,722 18.98 0.0007
2017-05-15 2017-03-31 13F VICOR Common equity shares 925815102 403,157 15,805 4.08 6,490 10.86 0.0006
2017-02-09 2016-12-31 13F VICOR Common equity shares 925815102 387,352 18,356 4.97 5,854 36.65 0.0006
2017-01-13 2016-09-30 13F/A-1 VICOR Common equity shares 925815102 368,996 7,269 2.01 4,284 17.66 0.0004
2016-11-14 2016-09-30 13F VICOR Common equity shares 925815102 368,996 4,284
2016-08-12 2016-06-30 13F VICOR Common equity shares 925815102 361,727 1,937 0.54 3,641 -3.42 0.0004
2016-05-20 2016-03-31 13F/A-1 VICOR Common equity shares 925815102 359,790 -8,091 -2.20 3,770 12.34 0.0004
2016-05-12 2016-03-31 13F VICOR Common equity shares 925815102 359,790 3,770
2016-02-16 2015-12-31 13F VICOR Common equity shares 925815102 367,881 11,887 3.34 3,356 -7.50 0.0004
2015-11-16 2015-09-30 13F VICOR Common equity shares 925815102 355,994 -1,564 -0.44 3,628 -16.75 0.0004
2015-08-13 2015-06-30 13F VICOR Common equity shares 925815102 357,558 727 0.20 4,358 -19.64 0.0005
2015-05-15 2015-03-31 13F VICOR Common equity shares 925815102 356,831 5,509 1.57 5,423 27.66 0.0006
2015-02-11 2014-12-31 13F VICOR Common equity shares 925815102 351,322 1,461 0.42 4,248 29.04 0.0004
2014-11-12 2014-09-30 13F/A-1 VICOR Common equity shares 925815102 349,861 -11,861 -3.28 3,292 8.65 0.0004
2014-11-10 2014-09-30 13F VICOR Common equity shares 925815102 349,861 3,292
2014-08-12 2014-06-30 13F VICOR Common equity shares 925815102 361,722 -922 -0.25 3,030 -18.00 0.0003
2014-05-15 2014-03-31 13F/A-1 VICOR Common equity shares 925815102 362,644 -1,983 -0.54 3,695 -24.45 0.0004
2014-05-13 2014-03-31 13F VICOR Common equity shares 925815102 362,644 3,695
2014-02-06 2013-12-31 13F/A-1 VICOR Common equity shares 925815102 364,627 -2,293 -0.62 4,891 62.87 0.0005
2014-02-06 2013-12-31 13F VICOR Common equity shares 925815102 383,683 2,080
2013-11-12 2013-09-30 13F VICOR Common equity shares 925815102 366,920 3,243 0.89 3,003 20.36 0.0004
2013-08-08 2013-06-30 13F VICOR Common equity shares 925815102 363,677 363,677 2,495 0.0003
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.