William A Kromberg

Insider

First SEC filing: March 3, 2009 · Latest: March 3, 2009

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.

Insider at

MTX selling Feb. 26, 2008

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 65 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

65 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 1, 2010	MTX	M	566	—	—	4,496 Direct	-11.18%	Disposed	(price as of 2026-08-20)
March 1, 2010	MTX	M	567	—	—	5,062 Direct	-10.07%	Disposed	(price as of 2026-08-20)
March 1, 2010	MTX	F	205	$49.40	$10,127	5,817 Direct	-3.40%	Disposed	186.2% (price as of 2026-08-20)
March 1, 2010	MTX	M	566	—	—	6,022 Direct	+10.37%	Acquired	(price as of 2026-08-20)
March 1, 2010	MTX	F	205	$49.40	$10,127	5,456 Direct	-3.62%	Disposed	186.2% (price as of 2026-08-20)
March 1, 2010	MTX	M	567	—	—	5,661 Direct	+11.13%	Acquired	(price as of 2026-08-20)
Feb. 23, 2010	MTX	M	1,100	—	—	5,629 Direct	-16.35%	Disposed	(price as of 2026-08-20)
Feb. 23, 2010	MTX	F	398	$48.56	$19,327	5,094 Direct	-7.25%	Disposed	191.1% (price as of 2026-08-20)
Feb. 23, 2010	MTX	M	1,100	—	—	5,492 Direct	+25.05%	Acquired	(price as of 2026-08-20)
Jan. 28, 2010	MTX	M	900	—	—	4,599 Direct	-16.37%	Disposed	(price as of 2026-08-20)
Jan. 28, 2010	MTX	F	381	$48.27	$18,391	4,392 Direct	-7.98%	Disposed	192.9% (price as of 2026-08-20)
Jan. 28, 2010	MTX	M	900	—	—	4,773 Direct	+23.24%	Acquired	(price as of 2026-08-20)
Jan. 27, 2010	MTX	A	2,130	—	—	6,729 Direct	+46.31%	Acquired	(price as of 2026-08-20)
Jan. 27, 2010	MTX	A	3,640	—	—	22,962 Direct	+18.84%	Acquired	(price as of 2026-08-20)
March 2, 2009	MTX	M	567	—	—	2,799 Direct	-16.84%	Disposed	(price as of 2026-08-20)
March 2, 2009	MTX	F	191	$28.85	$5,510	3,873 Direct	-4.70%	Disposed	390.0% (price as of 2026-08-20)
March 2, 2009	MTX	M	567	—	—	4,064 Direct	+16.21%	Acquired	(price as of 2026-08-20)
Feb. 27, 2009	MTX	M	567	—	—	3,366 Direct	-14.42%	Disposed	(price as of 2026-08-20)
Feb. 27, 2009	MTX	F	191	$30.30	$5,787	3,497 Direct	-5.18%	Disposed	366.5% (price as of 2026-08-20)
Feb. 27, 2009	MTX	M	567	—	—	3,688 Direct	+18.17%	Acquired	(price as of 2026-08-20)
Feb. 25, 2009	MTX	M	900	—	—	3,933 Direct	-18.62%	Disposed	(price as of 2026-08-20)
Feb. 25, 2009	MTX	F	304	$31.48	$9,570	3,121 Direct	-8.88%	Disposed	349.0% (price as of 2026-08-20)
Feb. 25, 2009	MTX	M	900	—	—	3,425 Direct	+35.64%	Acquired	(price as of 2026-08-20)
Feb. 23, 2009	MTX	M	466	—	—	4,833 Direct	-8.79%	Disposed	(price as of 2026-08-20)
Feb. 23, 2009	MTX	F	157	$32.03	$5,029	2,525 Direct	-5.85%	Disposed	341.3% (price as of 2026-08-20)
Feb. 23, 2009	MTX	M	466	—	—	2,682 Direct	+21.03%	Acquired	(price as of 2026-08-20)
Jan. 28, 2009	MTX	A	2,700	—	—	5,499 Direct	+96.46%	Acquired	(price as of 2026-08-20)
Jan. 28, 2009	MTX	A	4,700	—	—	19,322 Direct	+32.14%	Acquired	(price as of 2026-08-20)
July 1, 2008	MTX	M	800	—	—	5,299 Direct	-13.12%	Disposed	(price as of 2026-08-20)
July 1, 2008	MTX	F	270	$63.82	$17,231	2,216 Direct	-10.86%	Disposed	121.5% (price as of 2026-08-20)
July 1, 2008	MTX	M	800	—	—	2,486 Direct	+47.45%	Acquired	(price as of 2026-08-20)
Feb. 28, 2008	MTX	M	567	—	—	6,099 Direct	-8.51%	Disposed	(price as of 2026-08-20)
Feb. 28, 2008	MTX	F	191	$60.35	$11,527	1,686 Direct	-10.18%	Disposed	134.2% (price as of 2026-08-20)
Feb. 28, 2008	MTX	M	567	—	—	1,877 Direct	+43.28%	Acquired	(price as of 2026-08-20)
Feb. 27, 2008	MTX	A	1,700	—	—	6,666 Direct	+34.23%	Acquired	(price as of 2026-08-20)
Feb. 27, 2008	MTX	A	2,800	—	—	14,622 Direct	+23.68%	Acquired	(price as of 2026-08-20)
Feb. 26, 2008	MTX	S	57	$63.99	$3,647	1,310 Direct	-4.17%	Disposed	120.9% (price as of 2026-08-20)
Feb. 26, 2008	MTX	S	100	$63.97	$6,397	1,367 Direct	-6.82%	Disposed	121.0% (price as of 2026-08-20)
Feb. 22, 2008	MTX	M	467	—	—	4,966 Direct	-8.60%	Disposed	(price as of 2026-08-20)
Feb. 22, 2008	MTX	M	467	—	—	1,467 Direct	+46.70%	Acquired	(price as of 2026-08-20)
Nov. 1, 2007	MTX	S	310	$69.00	$21,390	1,000 Direct	-23.66%	Disposed	104.9% (price as of 2026-08-20)
Oct. 31, 2007	MTX	S	2,440	$70.22	$171,337	0 Indirect	-100.00%	Disposed	101.3% (price as of 2026-08-20)
Feb. 28, 2007	MTX	A	1,700	—	—	5,433 Direct	+45.54%	Acquired	(price as of 2026-08-20)
Feb. 28, 2007	MTX	A	2,800	—	—	11,822 Direct	+31.04%	Acquired	(price as of 2026-08-20)
Feb. 22, 2007	MTX	M	467	—	—	3,733 Direct	-11.12%	Disposed	(price as of 2026-08-20)
Feb. 22, 2007	MTX	F	157	$61.43	$9,645	1,310 Direct	-10.70%	Disposed	130.1% (price as of 2026-08-20)
Feb. 22, 2007	MTX	M	467	—	—	1,467 Direct	+46.70%	Acquired	(price as of 2026-08-20)
Feb. 22, 2007	MTX	M	467	—	—	3,733 Direct	-11.12%	Disposed	(price as of 2026-08-20)
Feb. 22, 2007	MTX	M	467	—	—	1,467 Direct	+46.70%	Acquired	(price as of 2026-08-20)
Feb. 22, 2006	MTX	A	2,100	$54.23	$113,883	9,022 Direct	+30.34%	Acquired	160.7% (price as of 2026-08-20)
Feb. 22, 2006	MTX	A	1,400	—	—	4,200 Direct	+50.00%	Acquired	(price as of 2026-08-20)
Feb. 22, 2006	MTX	A	2,100	—	—	9,022 Direct	+30.34%	Acquired	(price as of 2026-08-20)
Feb. 23, 2005	MTX	A	1,100	—	—	2,800 Direct	+64.71%	Acquired	(price as of 2026-08-20)
Feb. 23, 2005	MTX	A	1,600	—	—	6,922 Direct	+30.06%	Acquired	(price as of 2026-08-20)
June 11, 2004	MTX	J	0	—	—	1,966 Indirect	0.00%	Acquired	(price as of 2026-08-20)
June 11, 2004	MTX	M	1,000	—	—	5,322 Direct	+23.14%	Acquired	(price as of 2026-08-20)
June 11, 2004	MTX	M	1,000	$34.83	$34,830	1,000 Direct	—	Acquired	305.9% (price as of 2026-08-20)
June 8, 2004	MTX	M	6,500	—	—	6,322 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2004	MTX	M	16,500	—	—	12,822 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2004	MTX	S	23,000	$59.04	$1,357,920	0 Direct	-100.00%	Disposed	139.4% (price as of 2026-08-20)
June 8, 2004	MTX	M	6,500	$34.83	$226,395	23,000 Direct	+39.39%	Acquired	305.9% (price as of 2026-08-20)
June 8, 2004	MTX	M	16,500	$39.53	$652,245	16,500 Direct	—	Acquired	257.6% (price as of 2026-08-20)
June 7, 2004	MTX	M	9,128	—	—	29,322 Direct	+45.20%	Acquired	(price as of 2026-08-20)
June 7, 2004	MTX	S	9,128	$59.00	$538,552	0 Direct	-100.00%	Disposed	139.6% (price as of 2026-08-20)
June 7, 2004	MTX	M	9,128	$39.53	$360,830	9,128 Direct	—	Acquired	257.6% (price as of 2026-08-20)
March 1, 2004	MTX	J	0	$57.10	—	1,966 Indirect	0.00%	Acquired	147.6% (price as of 2026-08-20)
Feb. 25, 2004	MTX	A	2,600	—	—	38,450 Direct	+7.25%	Acquired	(price as of 2026-08-20)
Feb. 25, 2004	MTX	A	900	—	—	1,700 Direct	+112.50%	Acquired	(price as of 2026-08-20)
Dec. 31, 2003	MTX	A	36	—	—	960 Direct	+3.90%	Acquired	(price as of 2026-08-20)
Nov. 5, 2003	MTX	A	800	—	—	800 Direct	—	Acquired	(price as of 2026-08-20)
Sept. 26, 2003	MTX	J	7	$51.44	$360	1,833 Indirect	+0.38%	Acquired	174.8% (price as of 2026-08-20)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
March 1, 2010	MTX	DRSUs	Common Stock (566)	—	—	566	Disposed
March 1, 2010	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (567)	—	—	567	Disposed
Feb. 23, 2010	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (1,100)	—	—	1,100	Disposed
Jan. 28, 2010	MTX	DRSUs	Common Stock (900)	—	—	900	Disposed
Jan. 27, 2010	MTX	Deferred Restricted Stock Units (DRSUs)	Common Stock (2,130)	—	—	2,130	Acquired
Jan. 27, 2010	MTX	Employee Stock Option (Right to Buy)	Common Stock (3,640)	$49.12	Jan. 27, 2020	3,640	Acquired
March 2, 2009	MTX	DRSUs	Common Stock (567)	—	—	567	Disposed
Feb. 27, 2009	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (567)	—	—	567	Disposed
Feb. 25, 2009	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (900)	—	—	900	Disposed
Feb. 23, 2009	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (466)	—	—	466	Disposed
Jan. 28, 2009	MTX	Deferred Restricited Stock Units ("DRSUs")	Common Stock (2,700)	—	—	2,700	Acquired
Jan. 28, 2009	MTX	Employee Stock Option (Right to Buy)	Common Stock (4,700)	$39.71	Jan. 28, 2019	4,700	Acquired
July 1, 2008	MTX	Deferred Restricted Stock Units ("DRSUs")	COMMON STOCK (800)	—	—	800	Disposed
Feb. 28, 2008	MTX	DRSUs	Common Stock (567)	—	—	567	Disposed
Feb. 27, 2008	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (1,700)	—	—	1,700	Acquired
Feb. 27, 2008	MTX	Employee Stock Option (Right to Buy)	Common Stock (2,800)	$64.16	Feb. 27, 2018	2,800	Acquired
Feb. 22, 2008	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (467)	—	—	467	Disposed
Feb. 28, 2007	MTX	Deferred Restricted Stock Units ("DRSUs")	Common Stock (1,700)	—	—	1,700	Acquired
Feb. 28, 2007	MTX	Employee Stock Option (Right to Buy)	Common Stock (2,800)	$61.56	Feb. 28, 2017	2,800	Acquired
Feb. 22, 2007	MTX	Deferred Restricted Stock Units ("DRSUs")	COMMON STOCK (467)	—	—	467	Disposed
Feb. 22, 2007	MTX	Deferred Restricted Stock Units ("DRSUs")	COMMON STOCK (467)	—	—	467	Disposed
Feb. 22, 2006	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (2,100)	—	Feb. 22, 2016	2,100	Acquired
Feb. 22, 2006	MTX	DEFERRED STOCK	COMMON STOCK (1,400)	—	—	1,400	Acquired
Feb. 22, 2006	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (2,100)	$53.79	Feb. 22, 2016	2,100	Acquired
Feb. 23, 2005	MTX	DEFERRED STOCK	COMMON STOCK (1,100)	—	—	1,100	Acquired
Feb. 23, 2005	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (1,600)	$61.94	—	1,600	Acquired
June 11, 2004	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (1,000)	$34.83	—	1,000	Acquired
June 8, 2004	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (6,500)	$34.83	—	6,500	Acquired
June 8, 2004	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (16,500)	$39.53	—	16,500	Acquired
June 7, 2004	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (9,128)	$39.53	—	9,128	Acquired
Feb. 25, 2004	MTX	EMPLOYEE STOCK OPTION (RIGHT TO BUY)	COMMON STOCK (2,600)	$53.89	—	2,600	Acquired
Feb. 25, 2004	MTX	DEFERRED STOCK	COMMON STOCK (900)	—	Feb. 25, 2009	900	Acquired
Dec. 31, 2003	MTX	PHANTOM STOCK UNITS	COMMON STOCK (36)	—	—	36	Acquired
Nov. 5, 2003	MTX	DEFERRED STOCK [F1]	COMMON STOCK (800)	—	—	800	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).