Mercury Systems, Inc.
US ˙ NasdaqGS ˙ US5893781089

SecurityMRCY / Mercury Systems, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership671,331 shares
Latest Disclosed Value $ 48,946,783
Morgan Stanley reports 8.12% decrease in ownership of MRCY / Mercury Systems, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 671,331 shares of Mercury Systems, Inc. (US:MRCY) valued at $48,946,743 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 730,676 shares of Mercury Systems, Inc.. This represents a change in shares of -8.12% during the quarter. The current value of the position is $79,096,218 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 671,331 -59,345 -8.12 48,947 -8.25 0.0029
2026-05-27 2025-12-31 13F/A-1 MERCURY SYS COM 589378108 730,676 -145,721 -16.63 53,347 -21.36 0.0032
2026-02-13 2025-12-31 13F MERCURY SYS COM 589378108 730,676 -145,721 53,347
2026-05-27 2025-09-30 13F/A-1 MERCURY SYS COM 589378108 876,397 -51,774 -5.58 67,833 35.69 0.0041
2025-11-14 2025-09-30 13F MERCURY SYS COM 589378108 876,397 -51,774 67,833 0.0041
2025-08-15 2025-06-30 13F MERCURY SYS COM 589378108 928,171 385,331 70.98 49,991 113.73 0.0033
2025-05-15 2025-03-31 13F MERCURY SYS COM 589378108 542,840 27,579 5.35 23,391 8.09 0.0017
2025-05-15 2024-12-31 13F/A-1 MERCURY SYS COM 589378108 515,261 -36,343 -6.59 21,641 6.03 0.0015
2025-02-14 2024-12-31 13F MERCURY SYS COM 589378108 515,261 -36,343 21,641 0.0015
2025-05-14 2024-09-30 13F/A-2 MERCURY SYS COM 589378108 551,604 -253,940 -31.52 20,409 -6.13 0.0015
2025-02-14 2024-09-30 13F/A-1 MERCURY SYS COM 589378108 551,604 -253,940 20,409 0.0015
2024-11-14 2024-09-30 13F MERCURY SYS COM 589378108 551,604 -253,940 20,409 0.0002
2025-05-14 2024-06-30 13F/A-2 MERCURY SYS COM 589378108 805,544 294,247 57.55 21,742 44.14 0.0017
2024-10-17 2024-06-30 13F/A-1 MERCURY SYS COM 589378108 805,544 294,247 21,742 0.0017
2024-08-14 2024-06-30 13F MERCURY SYS COM 589378108 805,544 294,247 21,742 0.0017
2024-10-17 2024-03-31 13F/A-2 MERCURY SYS COM 589378108 511,297 209,682 69.52 15,083 36.75 0.0012
2024-08-16 2024-03-31 13F/A-1 MERCURY SYS COM 589378108 511,297 209,682 15,083 0.0001
2024-05-15 2024-03-31 13F MERCURY SYS COM 589378108 511,297 209,682 15,083 0.0012
2024-08-16 2023-12-31 13F/A-1 MERCURY SYS COM 589378108 301,615 -40,896 -11.94 11,030 -13.17 0.0010
2024-02-13 2023-12-31 13F MERCURY SYS COM 589378108 301,615 -40,896 11,030 0.0010
2023-11-15 2023-09-30 13F MERCURY SYS COM 589378108 342,511 145,095 73.50 12,704 86.04 0.0013
2023-08-14 2023-06-30 13F MERCURY SYS COM 589378108 197,416 -173,469 -46.77 6,829 -63.99 0.0007
2023-05-15 2023-03-31 13F MERCURY SYS COM 589378108 370,885 -49,544 -11.78 18,960 0.80 0.0020
2023-02-14 2022-12-31 13F MERCURY SYS COM 589378108 420,429 36,075 9.39 18,810 20.53 0.0021
2022-11-14 2022-09-30 13F MERCURY SYS COM 589378108 384,354 -25,023 -6.11 15,605 -40.74 0.0021
2022-10-27 2022-06-30 13F/A-1 MERCURY SYS COM 589378108 409,377 204,214 99.54 26,335 99.16 0.0034
2022-08-15 2022-06-30 13F MERCURY SYS COM 589378108 409,377 204,214 26,335 0.0034
2022-10-27 2022-03-31 13F/A-1 MERCURY SYS COM 589378108 205,163 171,936 517.46 13,223 623.36 0.0018
2022-05-13 2022-03-31 13F MERCURY SYS COM 589378108 205,163 171,936 13,223 0.0018
2022-02-14 2021-12-31 13F MERCURY SYS COM 589378108 33,227 -231,608 -87.45 1,828 -85.44 0.0002
2021-11-15 2021-09-30 13F MERCURY SYS COM 589378108 264,835 196,964 290.20 12,559 179.15 0.0017
2021-08-23 2021-06-30 13F/A-1 MERCURY SYS COM 589378108 67,871 -79,305 -53.88 4,499 -56.73 0.0006
2021-08-16 2021-06-30 13F MERCURY SYS COM 589378108 67,871 -79,305 4,499 0.0001
2021-05-17 2021-03-31 13F MERCURY SYS COM 589378108 147,176 55,237 60.08 10,398 28.45 0.0015
2021-02-16 2020-12-31 13F MERCURY SYS COM 589378108 91,939 55,320 151.07 8,095 185.34 0.0013
2020-11-13 2020-09-30 13F MERCURY SYS COM 589378108 36,619 -23,458 -39.05 2,837 -39.97 0.0005
2020-08-14 2020-06-30 13F MERCURY SYS COM 589378108 60,077 34,303 133.09 4,726 156.99 0.0010
2020-05-26 2020-03-31 13F/A-1 MERCURY SYS COM 589378108 25,774 -93,897 -78.46 1,839 -77.77 0.0005
2020-05-15 2020-03-31 13F MERCURY SYS COM 589378108 25,774 -93,897 1,839 141.2735
2020-02-14 2019-12-31 13F MERCURY SYS COM 589378108 119,671 -108,896 -47.64 8,271 -55.42 0.0019
2019-11-14 2019-09-30 13F MERCURY SYS COM 589378108 228,567 -104,687 -31.41 18,552 -20.87 0.0049
2019-08-14 2019-06-30 13F MERCURY SYS COM 589378108 333,254 149,860 81.71 23,445 99.50 0.0062
2019-05-15 2019-03-31 13F MERCURY SYS COM 589378108 183,394 55,660 43.57 11,752 94.57 0.0033
2019-02-14 2018-12-31 13F MERCURY SYS COM 589378108 127,734 19,808 18.35 6,040 1.17 0.0018
2019-04-23 2018-09-30 13F/A-2 MERCURY SYS COM 589378108 107,926 345 0.32 5,970 45.79 0.0015
2018-11-20 2018-09-30 13F/A-1 MERCURY SYS COM 589378108 107,926 0 5,970 0.0015
2018-11-14 2018-09-30 13F MERCURY SYS COM 589378108 107,926 345 5,970
2019-04-23 2018-06-30 13F/A-1 MERCURY SYS COM 589378108 107,581 -17,098 -13.71 4,095 -32.02 0.0011
2018-08-14 2018-06-30 13F MERCURY SYS COM 589378108 107,581 -17,098 4,095
2019-04-23 2018-03-31 13F/A-1 MERCURY SYS COM 589378108 124,679 -39,083 -23.87 6,024 -28.37 0.0017
2018-05-14 2018-03-31 13F MERCURY SYS COM 589378108 124,679 -39,083 6,024
2019-04-23 2017-12-31 13F/A-1 MERCURY SYS COM 589378108 163,762 22,474 15.91 8,410 14.72 0.0023
2018-02-14 2017-12-31 13F MERCURY SYS COM 589378108 163,762 22,474 8,410
2017-11-14 2017-09-30 13F MERCURY SYS COM 589378108 141,288 26,235 22.80 7,331 51.37 0.0022
2017-08-11 2017-06-30 13F MERCURY SYS COM 589378108 115,053 -2,742 -2.33 4,843 5.31 0.0015
2017-05-22 2017-03-31 13F/A-1 MERCURY SYS COM 589378108 117,795 -27,615 -18.99 4,599 4.67 0.0014
2017-05-12 2017-03-31 13F MERCURY SYS COM 589378108 117,795 4,599
2017-02-22 2016-12-31 13F/A-1 MERCURY SYS COM 589378108 145,410 113,593 357.02 4,394 461.89 0.0014
2017-02-13 2016-12-31 13F MERCURY SYS COM 589378108 145,410 4,394
2016-11-10 2016-09-30 13F MERCURY SYS COM 589378108 31,817 -7,013 -18.06 782 -18.96 0.0003
2016-08-12 2016-06-30 13F MERCURY SYS COM 589378108 38,830 -36,672 -48.57 965 -37.01 0.0003
2016-05-12 2016-03-31 13F MERCURY SYS COM 589378108 75,502 -12,620 -14.32 1,532 -5.26 0.0006
2016-02-09 2015-12-31 13F MERCURY SYS COM 589378108 88,122 7,456 9.24 1,617 25.93 0.0006
2016-02-08 2015-09-30 13F/A-1 MERCURY SYS COM 589378108 80,666 47,063 140.06 1,284 160.98 0.0005
2015-11-09 2015-09-30 13F MERCURY SYS COM 589378108 80,666 1,284
2015-08-12 2015-06-30 13F MERCURY SYS COM 589378108 33,603 -48,513 -59.08 492 -61.47 0.0002
2015-05-14 2015-03-31 13F MERCURY SYS COM 589378108 82,116 30,988 60.61 1,277 79.35 0.0005
2015-02-13 2014-12-31 13F MERCURY SYS COM 589378108 51,128 23,523 85.21 712 134.98 0.0003
2014-12-16 2014-09-30 13F/A-1 MERCURY SYS COM 589378108 27,605 21,430 347.04 303 269.51 0.0001
2014-11-14 2014-09-30 13F MERCURY SYS COM 589378108 27,605 303
2014-05-13 2014-03-31 13F MERCURY SYS COM 589378108 6,175 -5,867 -48.72 82 -37.88 0.0000
2014-02-13 2013-12-31 13F MERCURY SYS COM 589378108 12,042 12,042 132 0.0001
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.