EMERSON ELECTRIC CO — Director's Dealing 2006

Jul 13, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2006-07-11

Reporting Person: EMERSON ELECTRIC CO (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-07-11	Common Stock	S	25000	$19.0371	Disposed	5280005	Indirect
2006-07-12	Common Stock	S	25000	$19.3362	Disposed	5255005	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1065182	Direct

Footnotes

F1: The sales were effected in multiple transactions, at varying prices, on July 11, 2006, as follows: 16,800 shares at $19.00;
600 at $19.01; 1,400 at $19.02; 500 at $19.03; 600 at $19.04; 300 at $19.05; 200 at $19.06; 300 at $19.07; 100 at $19.08;
200 at $19.09; 703 at $19.10; 200 at $19.11; 100 at $19.12; 200 at $19.13; 100 at $19.16; 100 at $19.18; 1,000 at $19.21;
197 at $19.22; 100 at $19.23; 100 at $19.25; 800 at $19.26; and 400 at $19.27. The weighted average sales price for these
transactions was $19.0371 per share.

F2: The sales were effected in multiple transactions, at varying prices, on July 12, 2006, as follows and as described in
Footnote 3 below: 400 shares at $19.14; 100 at $19.15; 100 at $19.16; 300 at $19.17; 600 at $19.18; 600 at $19.19; 100 at
$19.20; 500 at $19.21; 897 at $19.22; 730 at $19.23; 1,583 at $19.24; 200 at $19.25; 2,200 at $19.26; 1,009 at $19.27; 912
at $19.28; 586 at $19.29; 713 at $19.30; 1,180 at $19.31; 656 at $19.32; 200 at $19.33; 400 at $19.34; 1,094 at $19.35; 500
at $19.36; 800 at $19.37; 300 at $19.38; 500 at $19.39; and 1,170 at $19.40.

F3: This footnote sets forth additional detail with respect to the transactions described in Footnote 2 as follows: 730 shares
at $19.41; 600 at $19.42; 900 at $19.43; 400 at $19.44; 200 at $19.45; 700 at $19.46; 220 at $19.47; 400 at $19.48; 300 at
$19.49; 200 at $19.51; 300 at $19.52; 200 at $19.53; 100 at $19.54; 400 at $19.56; 320 at $19.57; 100 at $19.58; 100 at
$19.61; and 500 at $19.63. The weighted average sales price for these transactions was $19.3362 per share.