Mercury Systems, Inc.
US ˙ NasdaqGS ˙ US5893781089

SecurityMRCY / Mercury Systems, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership60,816 shares
Latest Disclosed Value $ 4,440,176
Alliancebernstein L.p. ownership in MRCY / Mercury Systems, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 60,816 shares of Mercury Systems, Inc. (US:MRCY) valued at $4,434,095 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 60,816 shares of Mercury Systems, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $7,165,341 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 60,816 0 0.00 4,440 0.00 0.0014
2026-02-17 2025-12-31 13F MERCURY SYS COM 589378108 60,816 3,391 5.91 4,440 -0.09 0.0014
2025-11-14 2025-09-30 13F MERCURY SYS COM 589378108 57,425 -2,320 -3.88 4,445 38.14 0.0014
2025-08-14 2025-06-30 13F MERCURY SYS COM 589378108 59,745 -5,799 -8.85 3,218 13.92 0.0010
2025-05-15 2025-03-31 13F MERCURY SYS COM 589378108 65,544 0 0.00 2,824 2.62 0.0010
2025-02-12 2024-12-31 13F MERCURY SYS COM 589378108 65,544 -591 -0.89 2,753 12.51 0.0009
2024-11-14 2024-09-30 13F MERCURY SYS COM 589378108 66,135 -2,300 -3.36 2,447 32.43 0.0008
2024-08-14 2024-06-30 13F MERCURY SYS COM 589378108 68,435 43,768 177.44 1,847 154.06 0.0006
2024-05-14 2024-03-31 13F MERCURY SYS COM 589378108 24,667 306 1.26 728 -18.31 0.0003
2024-02-14 2023-12-31 13F MERCURY SYS COM 589378108 24,361 2,379 10.82 891 9.20 0.0003
2023-11-14 2023-09-30 13F MERCURY SYS COM 589378108 21,982 -56,353 -71.94 815 -69.92 0.0003
2023-08-15 2023-06-30 13F MERCURY SYS COM 589378108 78,335 -102 -0.13 2,710 -32.43 0.0011
2023-05-15 2023-03-31 13F MERCURY SYS COM 589378108 78,437 -2,754 -3.39 4,010 10.38 0.0017
2023-02-15 2022-12-31 13F MERCURY SYS COM 589378108 81,191 416 0.52 3,632 10.77 0.0016
2022-11-15 2022-09-30 13F MERCURY SYS COM 589378108 80,775 -985 -1.20 3,279 -37.66 0.0016
2022-08-15 2022-06-30 13F MERCURY SYS COM 589378108 81,760 1,872 2.34 5,260 2.16 0.0024
2022-05-13 2022-03-31 13F MERCURY SYS COM 589378108 79,888 -1,325 -1.63 5,149 15.14 0.0020
2022-02-14 2021-12-31 13F MERCURY SYS COM 589378108 81,213 232 0.29 4,472 16.46 0.0016
2021-11-10 2021-09-30 13F MERCURY SYS COM 589378108 80,981 -5,514 -6.37 3,840 -33.02 0.0015
2021-07-30 2021-06-30 13F MERCURY SYS COM 589378108 86,495 -4,725 -5.18 5,733 -11.05 0.0023
2021-05-06 2021-03-31 13F MERCURY SYS COM 589378108 91,220 -520,770 -85.09 6,445 -88.04 0.0028
2021-02-08 2020-12-31 13F MERCURY SYS COM 589378108 611,990 -262,787 -30.04 53,892 -20.47 0.0254
2020-11-12 2020-09-30 13F MERCURY SYS COM 589378108 874,777 75,636 9.46 67,760 7.80 0.0365
2020-08-13 2020-06-30 13F MERCURY SYS COM 589378108 799,141 -254,651 -24.17 62,860 -16.39 0.0369
2020-05-14 2020-03-31 13F MERCURY SYS COM 589378108 1,053,792 -119,920 -10.22 75,178 -7.32 0.0539
2020-02-18 2019-12-31 13F MERCURY SYS COM 589378108 1,173,712 292,684 33.22 81,115 13.43 0.0461
2019-11-14 2019-09-30 13F MERCURY SYS COM 589378108 881,028 -79,367 -8.26 71,513 5.84 0.0445
2019-08-14 2019-06-30 13F MERCURY SYS COM 589378108 960,395 186,994 24.18 67,564 36.33 0.0420
2019-05-14 2019-03-31 13F MERCURY SYS COM 589378108 773,401 -133,445 -14.72 49,560 15.56 0.0323
2019-02-13 2018-12-31 13F MERCURY SYS COM 589378108 906,846 -132,574 -12.75 42,885 -25.42 0.0318
2018-11-08 2018-09-30 13F MERCURY SYS COM 589378108 1,039,420 66,513 6.84 57,501 55.29 0.0376
2018-08-13 2018-06-30 13F MERCURY SYS COM 589378108 972,907 11,227 1.17 37,029 -20.31 0.0258
2018-05-14 2018-03-31 13F MERCURY SYS COM 589378108 961,680 256,648 36.40 46,468 28.35 0.0336
2018-02-13 2017-12-31 13F MERCURY SYS COM 589378108 705,032 -9,636 -1.35 36,203 -2.36 0.0259
2017-11-13 2017-09-30 13F MERCURY SYS COM 589378108 714,668 -10,902 -1.50 37,077 21.41 0.0278
2017-08-10 2017-06-30 13F MERCURY SYS COM 589378108 725,570 98,562 15.72 30,539 24.73 0.0236
2017-05-11 2017-03-31 13F MERCURY SYS COM 589378108 627,008 583,308 1,334.80 24,485 1,753.52 0.0195
2017-02-13 2016-12-31 13F MERCURY SYS COM 589378108 43,700 800 1.86 1,321 25.33 0.0011
2016-11-10 2016-09-30 13F MERCURY SYS COM 589378108 42,900 0 0.00 1,054 -1.13 0.0009
2016-08-11 2016-06-30 13F MERCURY SYS COM 589378108 42,900 0 0.00 1,066 22.39 0.0009
2016-05-13 2016-03-31 13F MERCURY SYS COM 589378108 42,900 0 0.00 871 10.53 0.0007
2016-02-16 2015-12-31 13F/A-1 MERCURY SYS COM 589378108 42,900 0 0.00 788 15.37 0.0007
2016-02-12 2015-12-31 13F MERCURY SYS COM 589378108 42,900 683
2015-11-13 2015-09-30 13F MERCURY SYS COM 589378108 42,900 23,200 117.77 683 137.15 0.0006
2015-08-14 2015-06-30 13F MERCURY SYS COM 589378108 19,700 -7,400 -27.31 288 -31.59 0.0002
2015-05-13 2015-03-31 13F MERCURY SYSTEMS COM 589378108 27,100 19,500 256.58 421 297.17 0.0003
2015-02-13 2014-12-31 13F MERCURY SYSTEMS COM 589378108 7,600 -1,500 -16.48 106 6.00 0.0001
2014-11-13 2014-09-30 13F MERCURY SYSTEMS COM 589378108 9,100 0 0.00 100 -2.91 0.0001
2014-08-13 2014-06-30 13F MERCURY SYSTEMS COM 589378108 9,100 -2,806 -23.57 103 -34.39 0.0001
2014-05-13 2014-03-31 13F MERCURY SYSTEMS COM 589378108 11,906 -5,800 -32.76 157 -19.07 0.0001
2014-02-13 2013-12-31 13F MERCURY SYSTEMS COM 589378108 17,706 -14,785 -45.50 194 -40.31 0.0002
2013-11-14 2013-09-30 13F MERCURY SYSTEMS COM 589378108 32,491 -4,594 -12.39 325 -4.97 0.0003
2013-08-13 2013-06-30 13F MERCURY SYSTEMS COM 589378108 37,085 37,085 342 0.0004
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.