Mercury Systems (MRCY)

As of 30 September 2026, short interest in MRCY is 5,013,538 shares, down 217,994 shares over the last month. Over the last 48 readings it ranged from 3,707,404 shares (13 February 2026) to 5,231,532 shares (31 August 2026). At the reported average volume of 679K shares a day that is 7.4 days to cover.

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As of 12 October 2026, the short share of MRCY volume is 78.0%, down 1.4 points over the last five sessions. Over the last 30 readings it ranged from 45.0% (24 September 2026) to 80.2% (6 October 2026). The latest reading sits at the top of that range. The latest reading is 17.2 points above the 30-session average of 60.7%, on 127K shares reported.

As of 10 September 2026, the fails-to-deliver balance in MRCY is 187 shares, up 167 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (27 May 2026) to 24,545 shares (16 July 2026). The latest reading sits at the bottom of that range.

Insiders at MRCY reported 31 open-market sells worth $41.9M in the last 90 days and no open-market buys. Latest filing: KUPINSKY STUART (EVP, CLO & Corp Sec) on 2026-09-21.

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

36 Form 144 notices on file for MRCY worth $43.8M at the prices reported; 27 in the last 90 days worth $41.8M. Latest: KUPINSKY STUART filed on 2026-09-21 to sell 1,000 shares ($87K) from 2026-09-21.

4 holders report 5% or more of MRCY in their latest filing, 1 on Schedule 13D (active intent). The largest reported stake is BlackRock, Inc. at 14.4% of the class (8,619,527 shares), filed 2026-07-29 for an event on 2026-06-30.

5 of the 30 tracked managers held MRCY at their latest 13F, $138.5M in total at quarter-end prices. Fisher Asset Management is the largest at $115.5M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 4 cut.

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

In Q4 FY 2026 (quarter ended 2026-07-03) Mercury Systems reported revenue of $289.8M, up 6.1% from the same quarter a year earlier, and net income of $798K. In FY 2026 it generated $102.4M of operating cash flow and spent $15.0M on buybacks.

Quarterly, last 8 quarters

Fiscal years, with buybacks and dividends

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-07-03; shares outstanding as of 2026-07-31 from the cover page.