EMERSON ELECTRIC CO — Director's Dealing 2006

Jul 11, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

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

Reporting Person: EMERSON ELECTRIC CO (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-07-07	Common Stock	S	25000	$19.5044	Disposed	5322405	Indirect
2006-07-10	Common Stock	S	17400	$19.2217	Disposed	5305005	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 7, 2006, as follows and as described in Footnote
2 below: 61 shares at $19.18; 71 at $19.21; 168 at $19.22; 200 at $19.23; 200 at $19.24; 1,000 at $19.25; 400 at $19.26;
1,200 at $19.27; 396 at $19.28; 300 at $19.29; 700 at $19.30; 700 at $19.31; 600 at $19.32; 600 at $19.33; 400 at $19.34;
299 at $19.35; 200 at $19.37; 100 at $19.39; 464 at $19.44; 119 at $19.45; 117 at $19.46; 100 at $19.47; 400 at $19.48; 491
at $19.49; 482 at $19.50; 207 at $19.51; 1,028 at $19.52; 970 at $19.53; 619 at $19.54; and 353 at $19.55.

F2: This footnote sets forth additional detail with respect to the transactions described in Footnote 1, as follows: 825 shares
at $19.56; 642 at $19.57; 900 at $19.58; 955 at $19.59; 400 at $19.60; 723 at $19.61; 741 at $19.62; 709 at $19.63; 1,536 at
$19.64; 816 at $19.65; 963 at $19.66; 146 at $19.67; 549 at $19.68; 100 at $19.69; 9 at $19.70; 300 at $19.71; 485 at
$19.72; 300 at $19.73; 595 at $19.74; 120 at $19.75; 200 at $19.76; and 41 at $19.78. The weighted average sales price for
these transactions was $19.5044 per share.

F3: The sales were effected in multiple transactions, at varying prices, on July 10, 2006, as follows and as described in
Footnote 4 below: 2,200 shares at $19.00; 100 at $19.04; 100 at $19.05; 100 at $19.06; 200 at $19.07; 200 at $19.08; 158 at
$19.09; 200 at $19.10; 300 at $19.11; 100 at $19.12; 156 at $19.13; 600 at $19.14; 42 at $19.15; 844 at $19.16; 200 at
$19.17; 100 at $19.18; 400 at $19.19; 700 at $19.20; 600 at $19.21; 752 at $19.22; 400 at $19.23; 1,329 at $19.24; and 319
at $19.25.

F4: This footnote sets forth additional detail with respect to the transactions described in Footnote 3 as follows: 200 shares
at $19.26; 700 at $19.27; 300 at $19.28; 100 at $19.29; 200 at $19.30; 500 at $19.32; 2,187 at $19.33; 1,100 at $19.34; 100
at $19.35; 613 at $19.36; 241 at $19.37; 100 at $19.38; 800 at $19.40; and 159 at $19.41. The weighted average sales price
for these transactions was $19.2217 per share.