Mercury Systems, Inc.
US ˙ NasdaqGS ˙ US5893781089

SecurityMRCY / Mercury Systems, Inc.
InstitutionFmr Llc
Latest Disclosed Ownership903,668 shares
Latest Disclosed Value $ 65,886,385
Fmr Llc reports 21.57% decrease in ownership of MRCY / Mercury Systems, Inc.

On May 15, 2026 - Fmr Llc filed a 13F-HR form disclosing ownership of 903,668 shares of Mercury Systems, Inc. (US:MRCY) valued at $65,886,434 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,152,192 shares of Mercury Systems, Inc.. This represents a change in shares of -21.57% during the quarter. The current value of the position is $100,840,312 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)
2026-05-15 2026-03-31 13F MERCURY SYS COM 589378108 903,668 -248,524 -21.57 65,886 -21.68 0.0007
2026-02-17 2025-12-31 13F MERCURY SYS COM 589378108 1,152,192 -331,281 -22.33 84,122 -26.74 0.0043
2025-11-13 2025-09-30 13F MERCURY SYS COM 589378108 1,483,473 314,381 26.89 114,821 82.35 0.0060
2025-08-14 2025-06-30 13F MERCURY SYS COM 589378108 1,169,092 330,952 39.49 62,967 74.35 0.0036
2025-05-12 2025-03-31 13F MERCURY SYS COM 589378108 838,140 282,146 50.75 36,115 54.66 0.0023
2025-02-13 2024-12-31 13F MERCURY SYS COM 589378108 555,994 552,927 18,028.27 23,352 20,564.60 0.0014
2024-11-13 2024-09-30 13F MERCURY SYS COM 589378108 3,067 974 46.54 113 101.79 0.0000
2024-08-13 2024-06-30 13F MERCURY SYS COM 589378108 2,093 642 44.25 56 33.33 0.0000
2024-05-13 2024-03-31 13F MERCURY SYS COM 589378108 1,451 -409,540 -99.65 43 -99.72 0.0000
2024-02-13 2023-12-31 13F MERCURY SYS COM 589378108 410,991 -812 -0.20 15,030 -1.60 0.0012
2023-11-13 2023-09-30 13F MERCURY SYS COM 589378108 411,803 -4,319 -1.04 15,274 6.11 0.0013
2023-08-11 2023-06-30 13F MERCURY SYS COM 589378108 416,122 -15,626 -3.62 14,394 -34.78 0.0012
2023-08-11 2023-03-31 13F/A-1 MERCURY SYS COM 589378108 431,748 -383,727 -47.06 22,071 -39.51 0.0020
2023-05-11 2023-03-31 13F MERCURY SYS COM 589378108 431,748 -383,727 22,071 0.0004
2023-02-13 2022-12-31 13F MERCURY SYS COM 589378108 815,475 35,678 4.58 36,484 15.24 0.0036
2022-11-10 2022-09-30 13F MERCURY SYS COM 589378108 779,797 17,815 2.34 31,660 -35.41 0.0033
2022-08-12 2022-06-30 13F MERCURY SYS COM 589378108 761,982 -174,202 -18.61 49,018 -18.76 0.0049
2022-05-13 2022-03-31 13F MERCURY SYS COM 589378108 936,184 567,438 153.88 60,337 197.18 0.0048
2022-02-14 2021-12-31 13F MERCURY SYS COM 589378108 368,746 -36,120 -8.92 20,303 5.76 0.0015
2022-02-14 2021-09-30 13F/A-1 MERCURY SYS COM 589378108 404,866 15,775 4.05 19,198 -25.56 0.0015
2021-11-15 2021-09-30 13F MERCURY SYS COM 589378108 404,866 15,775 19,198 0.0003
2021-08-13 2021-06-30 13F MERCURY SYS COM 589378108 389,091 -6,125 -1.55 25,789 -7.64 0.0020
2021-05-14 2021-03-31 13F MERCURY SYS COM 589378108 395,216 117,580 42.35 27,922 14.21 0.0024
2021-02-08 2020-12-31 13F MERCURY SYS COM 589378108 277,636 277,422 129,636.45 24,448 143,711.76 0.0022
2020-11-13 2020-09-30 13F MERCURY SYS COM 589378108 214 41 23.70 17 21.43 0.0000
2020-08-24 2020-06-30 13F/A-1 MERCURY SYS COM 589378108 173 0 0.00 14 7.69 0.0000
2020-08-13 2020-06-30 13F MERCURY SYS COM 589378108 173 0 14 0.3439
2020-05-14 2020-03-31 13F MERCURY SYS COM 589378108 173 0 0.00 13 8.33 0.0000
2020-02-07 2019-12-31 13F MERCURY SYS COM 589378108 173 -232 -57.28 12 -63.64 0.0000
2019-11-13 2019-09-30 13F MERCURY SYS COM 589378108 405 0 0.00 33 13.79 0.0000
2019-08-13 2019-06-30 13F MERCURY SYS COM 589378108 405 151 59.45 29 81.25 0.0000
2019-05-13 2019-03-31 13F MERCURY SYS COM 589378108 254 -238,551 -99.89 16 -99.86 0.0000
2019-02-13 2018-12-31 13F MERCURY SYS COM 589378108 238,805 -251,300 -51.27 11,293 -58.35 0.0015
2018-11-09 2018-09-30 13F MERCURY SYS COM 589378108 490,105 -9,295 -1.86 27,112 42.64 0.0031
2018-08-10 2018-06-30 13F MERCURY SYS COM 589378108 499,400 176,000 54.42 19,007 21.63 0.0022
2018-05-14 2018-03-31 13F MERCURY SYS COM 589378108 323,400 74,700 30.04 15,627 22.37 0.0019
2018-02-12 2017-12-31 13F MERCURY SYS COM 589378108 248,700 -102,393 -29.16 12,770 -6.86 0.0015
2017-05-11 2017-03-31 13F MERCURY SYS COM 589378108 351,093 188,800 116.33 13,710 179.57 0.0017
2017-02-10 2016-12-31 13F MERCURY SYS COM 589378108 162,293 114,993 243.11 4,904 322.03 0.0007
2016-11-14 2016-09-30 13F MERCURY SYS COM 589378108 47,300 0 0.00 1,162 -1.19 0.0002
2016-08-11 2016-06-30 13F MERCURY SYS COM 589378108 47,300 47,300 -87.54 1,176 -69.00 0.0002
2014-02-13 2013-12-31 13F MERCURY SYS COM 589378108 0 -379,705 -100.00 0 -100.00
2013-11-14 2013-09-30 13F MERCURY SYS COM 589378108 379,705 -2,595 -0.68 3,793 7.60 0.0006
2013-09-24 2013-06-30 13F/A-1 MERCURY SYS COM 589378108 382,300 382,300 3,525 0.0006
2013-08-14 2013-06-30 13F MERCURY SYS COM 589378108 382,300 3,525 0.0006
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.