Mercury Systems, Inc.
US ˙ NasdaqGS ˙ US5893781089

SecurityMRCY / Mercury Systems, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership43,638 shares
Latest Disclosed Value $ 3,181,647
Citigroup Inc reports 18.49% decrease in ownership of MRCY / Mercury Systems, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 43,638 shares of Mercury Systems, Inc. (US:MRCY) valued at $3,181,647 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 53,538 shares of Mercury Systems, Inc.. This represents a change in shares of -18.49% during the quarter. The current value of the position is $4,869,564 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 MERCURY SYS COM 589378108 43,638 -9,900 -18.49 3,182 -18.60 0.0007
2026-02-13 2025-12-31 13F MERCURY SYS COM 589378108 53,538 -5,520 -9.35 3,909 -14.50 0.0017
2025-11-10 2025-09-30 13F MERCURY SYS COM 589378108 59,058 -30,993 -34.42 4,571 -5.75 0.0020
2025-08-11 2025-06-30 13F MERCURY SYS COM 589378108 90,051 -22,745 -20.16 4,850 -0.21 0.0024
2025-05-12 2025-03-31 13F MERCURY SYS COM 589378108 112,796 5,543 5.17 4,860 7.90 0.0025
2025-02-12 2024-12-31 13F MERCURY SYS COM 589378108 107,253 -3,130 -2.84 4,505 10.28 0.0027
2024-11-12 2024-09-30 13F MERCURY SYS COM 589378108 110,383 14,620 15.27 4,084 58.05 0.0024
2024-08-12 2024-06-30 13F MERCURY SYS COM 589378108 95,763 -67,740 -41.43 2,585 -46.42 0.0017
2024-05-10 2024-03-31 13F MERCURY SYS COM 589378108 163,503 80,427 96.81 4,823 58.76 0.0032
2024-02-09 2023-12-31 13F MERCURY SYS COM 589378108 83,076 17,795 27.26 3,038 25.49 0.0021
2023-12-06 2023-09-30 13F/A-1 MERCURY SYS COM 589378108 65,281 26,983 70.46 2,421 82.85 0.0018
2023-11-09 2023-09-30 13F MERCURY SYS COM 589378108 65,281 26,983 2,421 0.0007
2023-08-10 2023-06-30 13F MERCURY SYS COM 589378108 38,298 -13,666 -26.30 1,325 -50.15 0.0009
2023-05-11 2023-03-31 13F MERCURY SYS COM 589378108 51,964 -5,012 -8.80 2,656 4.20 0.0019
2023-02-09 2022-12-31 13F MERCURY SYS COM 589378108 56,976 -15,604 -21.50 2,549 -13.48 0.0020
2022-11-10 2022-09-30 13F MERCURY SYS COM 589378108 72,580 -615 -0.84 2,946 -37.44 0.0021
2022-08-10 2022-06-30 13F MERCURY SYS COM 589378108 73,195 -19,805 -21.30 4,709 -21.44 0.0035
2022-05-12 2022-03-31 13F MERCURY SYS COM 589378108 93,000 -48,250 -34.16 5,994 -22.93 0.0036
2022-02-10 2021-12-31 13F MERCURY SYS COM 589378108 141,250 14,231 11.20 7,777 29.12 0.0042
2021-11-10 2021-09-30 13F MERCURY SYS COM 589378108 127,019 7,035 5.86 6,023 -24.27 0.0036
2021-08-10 2021-06-30 13F MERCURY SYS COM 589378108 119,984 -6,715 -5.30 7,953 -11.15 0.0048
2021-05-13 2021-03-31 13F MERCURY SYS COM 589378108 126,699 -9,376 -6.89 8,951 -25.30 0.0058
2021-02-11 2020-12-31 13F MERCURY SYS COM 589378108 136,075 20,173 17.41 11,983 33.47 0.0071
2020-11-12 2020-09-30 13F MERCURY SYS COM 589378108 115,902 931 0.81 8,978 -0.71 0.0059
2020-08-12 2020-06-30 13F MERCURY SYS COM 589378108 114,971 -20,882 -15.37 9,042 -6.71 0.0071
2020-05-12 2020-03-31 13F MERCURY SYS COM 589378108 135,853 -2,734 -1.97 9,692 1.19 0.0088
2020-02-12 2019-12-31 13F MERCURY SYS COM 589378108 138,587 -17,041 -10.95 9,578 -24.18 0.0069
2019-11-08 2019-09-30 13F MERCURY SYS COM 589378108 155,628 -1,368 -0.87 12,632 14.37 0.0100
2019-08-12 2019-06-30 13F MERCURY SYS COM 589378108 156,996 21,304 15.70 11,045 27.03 0.0089
2019-05-13 2019-03-31 13F MERCURY SYS COM 589378108 135,692 -212,777 -61.06 8,695 -47.24 0.0084
2019-02-12 2018-12-31 13F MERCURY SYS COM 589378108 348,469 -34,725 -9.06 16,479 -22.27 0.0167
2018-11-13 2018-09-30 13F MERCURY SYS COM 589378108 383,194 281,053 275.16 21,199 445.38 0.0189
2018-08-10 2018-06-30 13F MERCURY SYS COM 589378108 102,141 89,791 727.05 3,887 551.09 0.0036
2018-05-11 2018-03-31 13F MERCURY SYS COM 589378108 12,350 -37,059 -75.00 597 -76.48 0.0005
2018-02-12 2017-12-31 13F MERCURY SYS COM 589378108 49,409 -12,001 -19.54 2,538 -20.34 0.0020
2017-11-13 2017-09-30 13F MERCURY SYS COM 589378108 61,410 2,030 3.42 3,186 27.49 0.0026
2017-08-11 2017-06-30 13F MERCURY SYS COM 589378108 59,380 33,214 126.94 2,499 144.52 0.0023
2017-05-12 2017-03-31 13F MERCURY SYS COM 589378108 26,166 -49,886 -65.59 1,022 -55.53 0.0009
2017-02-10 2016-12-31 13F MERCURY SYS COM 589378108 76,052 44,072 137.81 2,298 192.37 0.0021
2016-11-10 2016-09-30 13F MERCURY SYS COM 589378108 31,980 13,991 77.78 786 76.23 0.0007
2016-08-12 2016-06-30 13F MERCURY SYS COM 589378108 17,989 -21,382 -54.31 446 -44.25 0.0005
2016-05-13 2016-03-31 13F MERCURY SYS COM 589378108 39,371 31,150 378.91 800 433.33 0.0009
2016-02-12 2015-12-31 13F MERCURY SYS COM 589378108 8,221 -8,786 -51.66 150 -44.44 0.0001
2015-11-13 2015-09-30 13F MERCURY SYS COM 589378108 17,007 6,476 61.49 270 75.32 0.0003
2015-08-13 2015-06-30 13F MERCURY SYS COM 589378108 10,531 -2,057 -16.34 154 -21.43 0.0001
2015-05-14 2015-03-31 13F MERCURY SYS COM 589378108 12,588 -11,473 -47.68 196 -41.49 0.0002
2015-02-17 2014-12-31 13F MERCURY SYS COM 589378108 24,061 13,563 129.20 335 191.30 0.0003
2014-11-14 2014-09-30 13F MERCURY SYS COM 589378108 10,498 10,184 3,243.31 115 3,733.33 0.0001
2014-08-14 2014-06-30 13F MERCURY SYS COM 589378108 314 -7,243 -95.84 3 -97.00 0.0000
2014-05-15 2014-03-31 13F MERCURY SYS COM 589378108 7,557 -15,102 -66.65 100 -59.68 0.0001
2014-02-14 2013-12-31 13F MERCURY SYS COM 589378108 22,659 11,904 110.68 248 131.78 0.0002
2013-11-14 2013-09-30 13F MERCURY SYS COM 589378108 10,755 -7,715 -41.77 107 -37.06 0.0001
2013-08-14 2013-06-30 13F MERCURY SYS COM 589378108 18,470 18,470 170 0.0002
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.