Mercury Systems, Inc.
US ˙ NasdaqGS ˙ US5893781089

SecurityMRCY / Mercury Systems, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,006,398 shares
Ownership 4.89%
Dimensional Fund Advisors Lp ownership in MRCY / Mercury Systems, Inc.

2018-02-05 - Dimensional Fund Advisors Lp has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2,006,398 shares of Mercury Systems, Inc. (US:MRCY). This represents 4.89 percent ownership of the company. In their previous filing dated 2016-02-09 , Dimensional Fund Advisors Lp had reported owning 1,866,032 shares, indicating an increase of 7.52 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2018-02-05 2018-02-05 13G/A 1,866,032 2,006,398 7.52 4.89 -9.11
2016-02-09 2016-02-09 13G 1,866,032 1,866,032 0.00 5.38

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-07 2026-03-31 13F MERCURY SYS COM 589378108 1,227,975 -247,846 -16.79 89,519 -16.92 0.0040
2026-02-12 2025-12-31 13F MERCURY SYS COM 589378108 1,475,821 -267,993 -15.37 107,753 -20.16 0.0226
2025-11-12 2025-09-30 13F MERCURY SYS COM 589378108 1,743,814 -87,561 -4.78 134,960 36.83 0.0290
2025-08-12 2025-06-30 13F MERCURY SYS COM 589378108 1,831,375 -212,842 -10.41 98,637 11.98 0.0228
2025-05-13 2025-03-31 13F MERCURY SYS COM 589378108 2,044,217 -157,907 -7.17 88,082 -4.76 0.0219
2025-02-13 2024-12-31 13F MERCURY SYS COM 589378108 2,202,124 52,725 2.45 92,490 16.30 0.0222
2024-11-07 2024-09-30 13F MERCURY SYS COM 589378108 2,149,399 122,241 6.03 79,530 45.36 0.0193
2024-08-09 2024-06-30 13F MERCURY SYS COM 589378108 2,027,158 20,604 1.03 54,713 -7.57 0.0143
2024-05-10 2024-03-31 13F MERCURY SYS COM 589378108 2,006,554 32,050 1.62 59,193 -18.02 0.0160
2024-02-07 2023-12-31 13F MERCURY SYS COM 589378108 1,974,504 325,549 19.74 72,208 18.07 0.0211
2023-11-09 2023-09-30 13F MERCURY SYS COM 589378108 1,648,955 80,799 5.15 61,159 12.75 0.0201
2023-08-09 2023-06-30 13F MERCURY SYS COM 589378108 1,568,156 116,903 8.06 54,242 -26.89 0.0173
2023-05-12 2023-03-31 13F MERCURY SYS COM 589378108 1,451,253 47,685 3.40 74,190 119,559.68 0.0250
2023-02-09 2022-12-31 13F MERCURY SYS COM 589378108 1,403,568 204,821 17.09 63 -99.87 0.0186
2022-11-10 2022-09-30 13F MERCURY SYS COM 589378108 1,198,747 126,684 11.82 48,672 -29.42 0.0187
2022-08-12 2022-06-30 13F MERCURY SYS COM 589378108 1,072,063 83,452 8.44 68,958 8.22 0.0247
2022-05-13 2022-03-31 13F MERCURY SYS COM 589378108 988,611 27,079 2.82 63,719 20.36 0.0196
2022-02-09 2021-12-31 13F MERCURY SYS COM 589378108 961,532 6,741 0.71 52,942 16.93 0.0160
2021-11-12 2021-09-30 13F MERCURY SYS COM 589378108 954,791 178,321 22.97 45,276 -12.02 0.0146
2021-08-12 2021-06-30 13F MERCURY SYS COM 589378108 776,470 -55,247 -6.64 51,464 -12.55 0.0163
2021-05-14 2021-03-31 13F MERCURY SYS COM 589378108 831,717 -58,952 -6.62 58,848 -24.97 0.0195
2021-03-08 2020-12-31 13F/A-2 MERCURY SYS COM 589378108 890,669 -2,910 -0.33 78,432 13.31 0.0283
2021-02-11 2020-12-31 13F MERCURY SYS COM 589378108 890,669 -2,910 78,432 28,325.4695
2020-11-12 2020-09-30 13F MERCURY SYS COM 589378108 893,579 -21,977 -2.40 69,219 -3.88 0.0294
2020-08-13 2020-06-30 13F MERCURY SYS COM 589378108 915,556 -124,881 -12.00 72,016 -2.98 0.0317
2020-05-14 2020-03-31 13F MERCURY SYS COM 589378108 1,040,437 -287,789 -21.67 74,231 -19.13 0.0387
2020-02-14 2019-12-31 13F MERCURY SYS COM 589378108 1,328,226 -204,055 -13.32 91,795 -26.19 0.0335
2019-11-12 2019-09-30 13F MERCURY SYS COM 589378108 1,532,281 -229,143 -13.01 124,375 0.37 0.0483
2019-08-13 2019-06-30 13F MERCURY SYS COM 589378108 1,761,424 -47,670 -2.64 123,912 6.89 0.0481
2019-08-12 2019-03-31 13F/A-2 MERCURY SYS COM 589378108 1,809,094 -2,883 -0.16 115,927 35.29 0.0462
2019-05-10 2019-03-31 13F MERCURY SYS COM 589378108 1,809,094 -2,883 115,927
2019-02-26 2018-12-31 13F/A-1 MERCURY SYS COM 589378108 1,811,977 -23,436 -1.28 85,687 -15.61 0.0388
2019-02-13 2018-12-31 13F MERCURY SYS COM 589378108 1,811,977 -23,436 85,687
2018-11-13 2018-09-30 13F MERCURY SYS COM 589378108 1,835,413 -7,172 -0.39 101,535 44.79 0.0386
2018-08-10 2018-06-30 13F MERCURY SYS COM 589378108 1,842,585 -597 -0.03 70,128 -21.26 0.0280
2018-05-11 2018-03-31 13F MERCURY SYS COM 589378108 1,843,182 10,753 0.59 89,063 -5.35 0.0371
2018-02-12 2017-12-31 13F MERCURY SYS COM 589378108 1,832,429 -25,907 -1.39 94,096 -2.40 0.0390
2017-11-13 2017-09-30 13F MERCURY SYS COM 589378108 1,858,336 -48,729 -2.56 96,408 20.11 0.0421
2017-08-11 2017-06-30 13F MERCURY SYS COM 589378108 1,907,065 -41,363 -2.12 80,268 5.50 0.0371
2017-05-12 2017-03-31 13F MERCURY SYS COM 589378108 1,948,428 -57,970 -2.89 76,086 25.48 0.0364
2017-02-09 2016-12-31 13F MERCURY SYS COM 589378108 2,006,398 -38,181 -1.87 60,634 20.70 0.0303
2016-11-10 2016-09-30 13F MERCURY SYS COM 589378108 2,044,579 37,388 1.86 50,235 0.68 0.0272
2016-08-09 2016-06-30 13F MERCURY SYS COM 589378108 2,007,191 25,209 1.27 49,898 24.02 0.0287
2016-05-13 2016-03-31 13F MERCURY SYS COM 589378108 1,981,982 115,950 6.21 40,234 17.43 0.0241
2016-02-10 2015-12-31 13F MERCURY SYS COM 589378108 1,866,032 103,042 5.84 34,261 22.15 0.0214
2015-11-13 2015-09-30 13F MERCURY SYS COM 589378108 1,762,990 52,649 3.08 28,049 12.02 0.0184
2015-08-14 2015-06-30 13F MERCURY SYS COM 589378108 1,710,341 66,201 4.03 25,039 -2.07 0.0153
2015-05-14 2015-03-31 13F MERCURY SYS COM 589378108 1,644,140 104,639 6.80 25,567 19.30 0.0161
2015-02-06 2014-12-31 13F MERCURY SYS COM 589378108 1,539,501 59,325 4.01 21,430 31.50 0.0141
2014-11-13 2014-09-30 13F MERCURY SYS COM 589378108 1,480,176 40,806 2.83 16,297 -0.15 0.0115
2014-08-08 2014-06-30 13F MERCURY SYS COM 589378108 1,439,370 75,534 5.54 16,322 -9.40 0.0113
2014-05-14 2014-03-31 13F MERCURY SYS COM 589378108 1,363,836 33,045 2.48 18,016 23.63 0.0135
2014-02-12 2013-12-31 13F MERCURY SYS COM 589378108 1,330,791 253,972 23.59 14,572 35.47 0.0114
2013-11-13 2013-09-30 13F MERCURY SYS COM 589378108 1,076,819 29,490 2.82 10,757 11.40 0.0093
2013-08-15 2013-06-30 13F MERCURY SYS COM 589378108 1,047,329 1,047,329 9,656 0.0091
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.