EMERSON ELECTRIC CO — Director's Dealing 2006

Jun 15, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2006-06-13

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
2006-06-13	Common Stock	S	43529	$19.5622	Disposed	6011092	Indirect
2006-06-13	Common Stock	G	200000	—	Disposed	5811092	Indirect
2006-06-14	Common Stock	S	34620	$19.3008	Disposed	5776472	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 13, 2006, as follows and as described in
Footnote 2 below: 100 shares at $19.23; 600 at $19.24; 510 at $19.26; 600 at $19.27; 400 at $19.28; 1,100 at $19.29; 210 at
$19.30; 1,310 at $19.31; 1,000 at $19.32; 100 at $19.33; 700 at $19.34; 400 at $19.35; 800 at $19.36; 400 at $19.37; 700 at
$19.38; 623 at $19.39; 600 at $19.40; 1,277 at $19.41; 500 at $19.42; 500 at $19.43; 900 at $19.44; 700 at $19.45; 710 at
$19.46; 400 at $19.47; 1,600 at $19.48; 900 at $19.49; 1,100 at $19.50; 872 at $19.51; 210 at $19.52; 610 at $19.53; 928 at
$19.54; and 700 at $19.55.

F2: This footnote sets forth additional detail with respect to the transactions described in Footnote 1, as follows: 800 shares
at $19.56; 1,100 at $19.57; 1,200 at $19.58; 500 at $19.59; 500 at $19.60; 1,100 at $19.61; 200 at $19.62; 600 at $19.63;
1,040 at $19.64; 1,065 at $19.65; 382 at $19.66; 181 at $19.67; 300 at $19.69; 300 at $19.70; 400 at $19.71; 600 at $19.72;
400 at $19.73; 800 at $19.74; 1,000 at $19.75; 600 at $19.76; 500 at $19.77; 400 at $19.78; 718 at $19.79; 600 at $19.80;
1,000 at $19.81; 700 at $19.82; 500 at $19.83; 300 at $19.84; 1,000 at $19.85; 600 at $19.86; 800 at $19.87; 207 at $19.88;
676 at $19.89; 200 at $19.90; and 200 at $19.92. The weighted average sales price for these transactions was $19.5622 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: Bona fide gift to the Emerson Charitable Trust.

F5: Price is not applicable to acquisitions or dispositions resulting from bona fide gifts.

F6: The sales were effected in multiple transactions, at varying prices, on June 14, 2006, as follows and as described in
Footnote 7 below: 100 shares at $19.03; 400 at $19.04; 100 at $19.05; 200 at $19.06; 600 at $19.07; 210 at $19.08; 700 at
$19.09; 300 at $19.10; 800 at $19.11; 200 at $19.12; 600 at $19.13; 1,100 at $19.14; 1,000 at $19.15; 1,600 at $19.16; 300
at $19.17; 1,800 at $19.18; 800 at $19.19; 1,100 at $19.20; 500 at $19.21; 300 at $19.22; 400 at $19.23; 600 at $19.24; 100
at $19.25; 300 at $19.26; 400 at $19.27; 100 at $19.28; 1,000 at $19.29; and 300 at $19.30.

F7: This footnote sets forth additional detail with respect to the transactions described in Footnote 6, as follows: 900 shares
at $19.31; 100 at $19.32; 800 at $19.33; 1,700 at $19.34; 1,500 at $19.35; 1,200 at $19.36; 220 at $19.37; 800 at $19.38;
800 at $19.39; 800 at $19.40; 689 at $19.41; 100 at $19.42; 400 at $19.43; 100 at $19.44; 2,601 at $19.45; 1,800 at $19.46;
1,690 at $19.47; 1,010 at $19.48; 100 at $19.49; 700 at $19.50; 600 at $19.51; and 100 at $19.53. The weighted average sales
price for these transactions was $19.3008 per share.

F8: The reported securities are owned directly by Emerson Electric Co.