EMERSON ELECTRIC CO — Director's Dealing 2006

Jun 26, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2006-06-22

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
2006-06-22	Common Stock	S	25000	$19.1863	Disposed	5572405	Indirect
2006-06-23	Common Stock	S	25000	$19.3773	Disposed	5547405	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 22, 2006, as follows: 5,800 shares at $19.00;
200 at $19.02; 100 at $19.04; 300 at $19.05; 500 at $19.06; 200 at $19.07; 200 at $19.08; 200 at $19.09; 200 at $19.10; 249
at $19.11; 251 at $19.12; 316 at $19.13; 400 at $19.14; 1,200 at $19.15; 300 at $19.16; 700 at $19.17; 200 at $19.18; 200 at
$19.19; 200 at $19.20; 100 at $19.21; 200 at $19.22; 1,000 at $19.24; 700 at $19.25; 1,300 at $19.26; 1,200 at $19.27; 800
at $19.28; 1,500 at $19.29; 1,200 at $19.30; 1,100 at $19.31; 1,100 at $19.32; 1,100 at $19.33; 1,016 at $19.34; 168 at
$19.35; 200 at $19.36; and 600 at $19.38. The weighted average sales price for these transactions was $19.1863 per share.

F2: The reported securities are owned directly by Astec America Inc. The Reporting Person is the ultimate parent company of
Astec America Inc.

F3: The sales were effected in multiple transactions, at varying prices, on June 23, 2006, as follows: 800 shares at $19.00; 200
at $19.02; 300 at $19.09; 200 at $19.10; 200 at $19.11; 300 at $19.13; 400 at $19.14; 100 at $19.17; 100 at $19.21; 28 at
$19.22; 200 at $19.24; 300 at $19.25; 100 at $19.26; 200 at $19.28; 100 at $19.29; 100 at $19.30; 400 at $19.31; 1,400 at
$19.32; 900 at $19.33; 2,700 at $19.34; 286 at $19.35; 1,214 at $19.36; 2,801 at $19.37; 299 at $19.38; 300 at $19.40; 100
at $19.41; 300 at $19.42; 800 at $19.43; 300 at $19.44; 1,200 at $19.45; 300 at $19.46; 1,600 at $19.47; 700 at $19.48;
1,500 at $19.49; 1,222 at $19.50; 400 at $19.51; 1,550 at $19.52; 300 at $19.53; 100 at $19.54; and 700 at $19.55. The
weighted average sales price for these transactions was $19.3773 per share.

F4: The reported securities are owned directly by Emerson Electric Co.