Transaction · 0001049521-26-000055

Ballhaus William L

Ballhaus William L, CHAIR, PRES, CEO, reported an open-market or private sale at MERCURY SYSTEMS INC involving 26802.000000 shares for an estimated $2688401.41. Reported holdings after the transaction were 250207.325000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market sellSEC transaction code SCHAIR, PRES, CEO
MRCYMERCURY SYSTEMS INC
Filing timeAug 21
Trade dateAug 19, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$91.36
Pre-filing
1mo ago +3.7%1w ago +22.2%1d ago +14.9%
Returns since
7d -3.1%30d -3.1%90d -3.1%180d -3.1%1y -3.1%

MRCY price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
MRCY since 2026-08-21Filed 14 days ago · 30 days of pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0001049521-26-000055
Common Stock
Transaction date
Aug 19, 2026
Filed Aug 21, 2026, 08:47 PM · 2d delay
Shares
26.8k sh
$10.0k per share
Estimated value
-$268M
Computed from shares × price
Holdings after
250k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Cluster Selling Direct Ownership Large Sale Repeat Seller
+10score
Filing-only score

+10

Compact filing score computed from stored Form 4 facts. Version v1.

Positive filing signal

This filing has a modest positive filing-only score. Treat it as a useful flag for review, not as a buy signal.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chairman, President & CEO

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    Represents shares sold as part of a sell-to-cover program to satisfy tax withholding obligations upon the vesting of stock awards.

  2. F2

    Represents the per share price attributed to sales of shares on behalf of all participants under the sell-to-cover program on the transaction date indicated.

Original filing · 0001049521-26-000055
Related transactions

0 other filings

Same reporting owner
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MRCY