EMERSON ELECTRIC CO — Director's Dealing 2006

Jul 5, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2006-06-30

Reporting Person: EMERSON ELECTRIC CO (10% Owner)
Reporting Person: ASTEC AMERICA INC (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-06-30	Common Stock	S	25000	$20.2981	Disposed	5422405	Indirect
2006-07-03	Common Stock	S	25000	$20.3126	Disposed	5397405	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1065182	Direct

Footnotes

F1: The sales were effected in multiple transactions, at varying prices, on June 30, 2006, as follows and as described in
Footnote 2 below: 386 shares at $19.99; 300 at $20.00; 14 at $20.02; 400 at $20.03; 200 at $20.04; 200 at $20.05; 300 at
$20.06; 300 at $20.08; 118 at $20.09; 200 at $20.13; 600 at $20.14; 200 at $20.15; 400 at $20.16; 477 at $20.17; 700 at
$20.18; 500 at $20.19; 1,200 at $20.20; 500 at $20.21; 1,100 at $20.22; 400 at $20.23; 100 at $20.24; 300 at $20.25; 600 at
$20.26; 1,400 at $20.27; 600 at $20.28; and 27 at $20.29.

F2: This footnote sets forth additional detail with respect to the transactions described in Footnote 1, as follows: 139 shares
at $20.30; 600 at $20.31; 300 at $20.32; 800 at $20.33; 300 at $20.34; 688 at $20.35; 200 at $20.36; 400 at $20.37; 800 at
$20.38; 1,101 at $20.39; 1,000 at $20.40; 1,399 at $20.41; 1,447 at $20.42; 1,350 at $20.43; 823 at $20.44; 1,169 at $20.45;
662 at $20.46; 200 at $20.47; and 100 at $20.48. The weighted average sales price for these transactions was $20.2981 per
share.

F3: The reported securities are owned directly by Astec America Inc. The Reporting Person is the ultimate parent company of
Astec America Inc.

F4: The sales were effected in multiple transactions, at varying prices, on July 3, 2006, as follows and as described in Footnote
5 below: 100 shares at $19.88; 100 at $19.91; 520 at $19.92; 100 at $19.93; 380 at $19.94; 200 at $19.95; 180 at $19.97; 24
at $20.00; 120 at $20.01; 176 at $20.03; 200 at $20.05; 100 at $20.07; 1,000 at $20.09; 600 at $20.11; 400 at $20.12; 200 at
$20.13; 100 at $20.15; 200 at $20.16; 400 at $20.18; 200 at $20.19; 300 at $20.20; 200 at $20.21; 200 at $20.22; 100 at
$20.24; 600 at $20.25; 158 at $20.26; 542 at $20.27; 307 at $20.28; and 76 at $20.29.

F5: This footnote sets forth additional detail with respect to the transactions described in Footnote 4, as follows: 300 shares
at $20.30; 100 at $20.31; 200 at $20.33; 100 at $20.34; 800 at $20.35; 400 at $20.36; 500 at $20.37; 1,500 at $20.38; 198 at
$20.39; 5,845 at $20.40; 2,991 at $20.41; 2,024 at $20.42; 742 at $20.43; 600 at $20.44; 317 at $20.45; 200 at $20.46; and
400 at $20.47. The weighted average sales price for these transactions was $20.3126 per share.

F6: The reported securities are owned directly by Emerson Electric Co.