John J Carmola

Insider

First SEC filing: June 3, 2013 · Latest: May 21, 2026

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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

MTX buying Aug. 6, 2013

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 71 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

71 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 18, 2026	MTX	A	43	—	—	27,954 Direct	+0.15%	Acquired	(price as of 2026-08-21)
May 20, 2026	MTX	A	1,908	—	—	27,912 Direct	+7.34%	Acquired	(price as of 2026-08-21)
March 6, 2026	MTX	A	46	—	—	26,004 Direct	+0.18%	Acquired	(price as of 2026-08-21)
Dec. 4, 2025	MTX	A	53	—	—	25,957 Direct	+0.20%	Acquired	(price as of 2026-08-21)
Sept. 5, 2025	MTX	A	44	—	—	25,904 Direct	+0.17%	Acquired	(price as of 2026-08-21)
June 12, 2025	MTX	A	51	—	—	25,860 Direct	+0.20%	Acquired	(price as of 2026-08-21)
May 14, 2025	MTX	A	2,500	—	—	25,809 Direct	+10.73%	Acquired	(price as of 2026-08-21)
March 7, 2025	MTX	A	38	—	—	23,309 Direct	+0.16%	Acquired	(price as of 2026-08-21)
Dec. 5, 2024	MTX	A	32	—	—	23,272 Direct	+0.14%	Acquired	(price as of 2026-08-21)
Oct. 1, 2024	MTX	A	92	—	—	23,240 Direct	+0.40%	Acquired	(price as of 2026-08-21)
Sept. 6, 2024	MTX	A	32	—	—	23,147 Direct	+0.14%	Acquired	(price as of 2026-08-21)
July 1, 2024	MTX	A	86	—	—	23,115 Direct	+0.37%	Acquired	(price as of 2026-08-21)
June 13, 2024	MTX	A	28	—	—	23,029 Direct	+0.12%	Acquired	(price as of 2026-08-21)
May 15, 2024	MTX	A	1,542	—	—	23,002 Direct	+7.19%	Acquired	(price as of 2026-08-21)
April 1, 2024	MTX	A	95	—	—	21,460 Direct	+0.44%	Acquired	(price as of 2026-08-21)
March 7, 2024	MTX	A	29	—	—	21,365 Direct	+0.14%	Acquired	(price as of 2026-08-21)
Jan. 2, 2024	MTX	A	100	—	—	21,336 Direct	+0.47%	Acquired	(price as of 2026-08-21)
Dec. 7, 2023	MTX	A	33	—	—	21,236 Direct	+0.16%	Acquired	(price as of 2026-08-21)
Oct. 2, 2023	MTX	A	131	—	—	21,202 Direct	+0.62%	Acquired	(price as of 2026-08-21)
Sept. 8, 2023	MTX	A	19	—	—	21,071 Direct	+0.09%	Acquired	(price as of 2026-08-21)
July 3, 2023	MTX	A	123	—	—	21,052 Direct	+0.59%	Acquired	(price as of 2026-08-21)
June 15, 2023	MTX	A	19	—	—	20,929 Direct	+0.09%	Acquired	(price as of 2026-08-21)
May 17, 2023	MTX	A	2,067	—	—	20,911 Direct	+10.97%	Acquired	(price as of 2026-08-21)
April 3, 2023	MTX	A	117	—	—	18,844 Direct	+0.62%	Acquired	(price as of 2026-08-21)
July 2, 2018	MTX	A	80	—	—	8,804 Direct	+0.92%	Acquired	(price as of 2026-08-21)
June 14, 2018	MTX	A	6	—	—	8,724 Direct	+0.07%	Acquired	(price as of 2026-08-21)
May 16, 2018	MTX	A	1,381	—	—	8,718 Direct	+18.82%	Acquired	(price as of 2026-08-21)
May 16, 2018	MTX	A	1,344	—	—	8,681 Direct	+18.32%	Acquired	(price as of 2026-08-21)
April 2, 2018	MTX	A	94	—	—	7,337 Direct	+1.30%	Acquired	(price as of 2026-08-21)
March 8, 2018	MTX	A	5	—	—	7,243 Direct	+0.07%	Acquired	(price as of 2026-08-21)
Jan. 2, 2018	MTX	A	88	—	—	7,238 Direct	+1.23%	Acquired	(price as of 2026-08-21)
Dec. 8, 2017	MTX	A	5	—	—	7,151 Direct	+0.07%	Acquired	(price as of 2026-08-21)
Oct. 2, 2017	MTX	A	84	—	—	7,145 Direct	+1.19%	Acquired	(price as of 2026-08-21)
Sept. 7, 2017	MTX	A	6	—	—	7,061 Direct	+0.09%	Acquired	(price as of 2026-08-21)
July 3, 2017	MTX	A	83	—	—	7,056 Direct	+1.19%	Acquired	(price as of 2026-08-21)
June 9, 2017	MTX	A	5	—	—	6,973 Direct	+0.07%	Acquired	(price as of 2026-08-21)
May 17, 2017	MTX	A	1,381	—	—	6,969 Direct	+24.71%	Acquired	(price as of 2026-08-21)
April 3, 2017	MTX	A	81	—	—	5,587 Direct	+1.47%	Acquired	(price as of 2026-08-21)
March 9, 2017	MTX	A	4	—	—	5,507 Direct	+0.07%	Acquired	(price as of 2026-08-21)
Jan. 3, 2017	MTX	A	78	—	—	5,503 Direct	+1.44%	Acquired	(price as of 2026-08-21)
Dec. 9, 2016	MTX	A	3	—	—	5,424 Direct	+0.06%	Acquired	(price as of 2026-08-21)
Oct. 3, 2016	MTX	A	88	—	—	5,421 Direct	+1.65%	Acquired	(price as of 2026-08-21)
Sept. 8, 2016	MTX	A	4	—	—	5,333 Direct	+0.08%	Acquired	(price as of 2026-08-21)
July 1, 2016	MTX	A	98	—	—	5,329 Direct	+1.87%	Acquired	(price as of 2026-08-21)
June 9, 2016	MTX	A	4	—	—	5,231 Direct	+0.08%	Acquired	(price as of 2026-08-21)
May 11, 2016	MTX	A	1,496	—	—	5,227 Direct	+40.10%	Acquired	(price as of 2026-08-21)
April 1, 2016	MTX	A	98	—	—	3,731 Direct	+2.70%	Acquired	(price as of 2026-08-21)
March 10, 2016	MTX	A	3	—	—	3,633 Direct	+0.08%	Acquired	(price as of 2026-08-21)
Jan. 4, 2016	MTX	A	130	—	—	3,629 Direct	+3.72%	Acquired	(price as of 2026-08-21)
Dec. 10, 2015	MTX	A	3	—	—	3,500 Direct	+0.09%	Acquired	(price as of 2026-08-21)
Oct. 1, 2015	MTX	A	116	—	—	3,497 Direct	+3.43%	Acquired	(price as of 2026-08-21)
Sept. 10, 2015	MTX	A	3	—	—	3,381 Direct	+0.09%	Acquired	(price as of 2026-08-21)
July 1, 2015	MTX	A	83	—	—	3,377 Direct	+2.52%	Acquired	(price as of 2026-08-21)
June 10, 2015	MTX	A	2	—	—	3,295 Direct	+0.06%	Acquired	(price as of 2026-08-21)
May 13, 2015	MTX	A	1,177	—	—	3,292 Direct	+55.65%	Acquired	(price as of 2026-08-21)
April 1, 2015	MTX	A	77	—	—	2,115 Direct	+3.78%	Acquired	(price as of 2026-08-21)
March 11, 2015	MTX	A	1	—	—	2,039 Direct	+0.05%	Acquired	(price as of 2026-08-21)
Jan. 2, 2015	MTX	A	82	—	—	2,037 Direct	+4.19%	Acquired	(price as of 2026-08-21)
Dec. 11, 2014	MTX	A	1	—	—	1,955 Direct	+0.05%	Acquired	(price as of 2026-08-21)
Oct. 1, 2014	MTX	A	88	—	—	1,953 Direct	+4.72%	Acquired	(price as of 2026-08-21)
Sept. 11, 2014	MTX	A	1	—	—	1,865 Direct	+0.05%	Acquired	(price as of 2026-08-21)
July 1, 2014	MTX	A	77	—	—	1,864 Direct	+4.31%	Acquired	(price as of 2026-08-21)
June 11, 2014	MTX	A	1	—	—	1,786 Direct	+0.06%	Acquired	(price as of 2026-08-21)
May 14, 2014	MTX	A	1,276	—	—	1,785 Direct	+250.69%	Acquired	(price as of 2026-08-21)
April 1, 2014	MTX	A	83	—	—	508 Direct	+19.53%	Acquired	(price as of 2026-08-21)
March 13, 2014	MTX	A	0	—	—	425 Direct	0.00%	Acquired	(price as of 2026-08-21)
Jan. 2, 2014	MTX	A	83	—	—	425 Direct	+24.27%	Acquired	(price as of 2026-08-21)
Dec. 12, 2013	MTX	A	0	—	—	342 Direct	0.00%	Acquired	(price as of 2026-08-21)
Oct. 1, 2013	MTX	A	181	—	—	342 Direct	+112.42%	Acquired	(price as of 2026-08-21)
Sept. 12, 2013	MTX	A	0	—	—	161 Direct	0.00%	Acquired	(price as of 2026-08-21)
Aug. 6, 2013	MTX	P	400	$46.59	$18,636	400 Direct	—	Acquired	54.1% (price as of 2026-08-21)
July 1, 2013	MTX	A	161	—	—	161 Direct	—	Acquired	(price as of 2026-08-21)

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
June 18, 2026	MTX	PHANTOM STOCK UNITS	COMMON STOCK (43)	—	—	43	Acquired
May 20, 2026	MTX	PHANTOM STOCK UNITS	COMMON STOCK (1,908)	—	—	1,908	Acquired
March 6, 2026	MTX	PHANTOM STOCK UNITS	COMMON STOCK (46)	—	—	46	Acquired
Dec. 4, 2025	MTX	PHANTOM STOCK UNITS	COMMON STOCK (53)	—	—	53	Acquired
Sept. 5, 2025	MTX	PHANTOM STOCK UNITS	COMMON STOCK (44)	—	—	44	Acquired
June 12, 2025	MTX	PHANTOM STOCK UNITS	COMMON STOCK (51)	—	—	51	Acquired
May 14, 2025	MTX	PHANTOM STOCK UNITS	COMMON STOCK (2,500)	—	—	2,500	Acquired
March 7, 2025	MTX	PHANTOM STOCK UNITS	COMMON STOCK (38)	—	—	38	Acquired
Dec. 5, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (32)	—	—	32	Acquired
Oct. 1, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (92)	—	—	92	Acquired
Sept. 6, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (32)	—	—	32	Acquired
July 1, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (86)	—	—	86	Acquired
June 13, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (28)	—	—	28	Acquired
May 15, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (1,542)	—	—	1,542	Acquired
April 1, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (95)	—	—	95	Acquired
March 7, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (29)	—	—	29	Acquired
Jan. 2, 2024	MTX	PHANTOM STOCK UNITS	COMMON STOCK (100)	—	—	100	Acquired
Dec. 7, 2023	MTX	PHANTOM STOCK UNITS	COMMON STOCK (33)	—	—	33	Acquired
Oct. 2, 2023	MTX	PHANTOM STOCK UNITS	COMMON STOCK (131)	—	—	131	Acquired
Sept. 8, 2023	MTX	PHANTOM STOCK UNITS	COMMON STOCK (19)	—	—	19	Acquired
July 3, 2023	MTX	PHANTOM STOCK UNITS	COMMON STOCK (123)	—	—	123	Acquired
June 15, 2023	MTX	PHANTOM STOCK UNITS	COMMON STOCK (19)	—	—	19	Acquired
May 17, 2023	MTX	PHANTOM STOCK UNITS	COMMON STOCK (2,067)	—	—	2,067	Acquired
April 3, 2023	MTX	PHANTOM STOCK UNITS	COMMON STOCK (117)	—	—	117	Acquired
July 2, 2018	MTX	Phantom Stock Units	Common Stock (80)	—	—	80	Acquired
June 14, 2018	MTX	Phantom Stock Units	Common Stock (6)	—	—	6	Acquired
May 16, 2018	MTX	Phantom Stock Units	Common Stock	—	—	1,381	Acquired
May 16, 2018	MTX	Phantom Stock Units	Common Stock (1,344)	—	—	1,344	Acquired
April 2, 2018	MTX	Phantom Stock Units	Common Stock (94)	—	—	94	Acquired
March 8, 2018	MTX	Phantom Stock Units	Common Stock (5)	—	—	5	Acquired
Jan. 2, 2018	MTX	Phantom Stock Units	Common Stock (88)	—	—	88	Acquired
Dec. 8, 2017	MTX	Phantom Stock Units	Common Stock (5)	—	—	5	Acquired
Oct. 2, 2017	MTX	Phantom Stock Units	Common Stock (84)	—	—	84	Acquired
Sept. 7, 2017	MTX	Phantom Stock Units	Common Stock (6)	—	—	6	Acquired
July 3, 2017	MTX	Phantom Stock Units	Common Stock (83)	—	—	83	Acquired
June 9, 2017	MTX	Phantom Stock Units	Common Stock (5)	—	—	5	Acquired
May 17, 2017	MTX	Phantom Stock Units	Common Stock (1,381)	—	—	1,381	Acquired
April 3, 2017	MTX	Phantom Stock Units	Common Stock (81)	—	—	81	Acquired
March 9, 2017	MTX	Phantom Stock Units	Common Stock (4)	—	—	4	Acquired
Jan. 3, 2017	MTX	Phantom Stock Units	Common Stock (78)	—	—	78	Acquired
Dec. 9, 2016	MTX	Phantom Stock Units	Common Stock (3)	—	—	3	Acquired
Oct. 3, 2016	MTX	Phantom Stock Units	Common Stock (88)	—	—	88	Acquired
Sept. 8, 2016	MTX	Phantom Stock Units	Common Stock (4)	—	—	4	Acquired
July 1, 2016	MTX	Phantom Stock Units	Common Stock (98)	—	—	98	Acquired
June 9, 2016	MTX	Phantom Stock Units	Common Stock (4)	—	—	4	Acquired
May 11, 2016	MTX	Phantom Stock Units	Common Stock (1,496)	—	—	1,496	Acquired
April 1, 2016	MTX	Phantom Stock Units	Common Stock (98)	—	—	98	Acquired
March 10, 2016	MTX	Phantom Stock Units	Common Stock (3)	—	—	3	Acquired
Jan. 4, 2016	MTX	Phantom Stock Units	Common Stock (130)	—	—	130	Acquired
Dec. 10, 2015	MTX	Phantom Stock Units	Common Stock (3)	—	—	3	Acquired
Oct. 1, 2015	MTX	Phantom Stock Units	Common Stock (116)	—	—	116	Acquired
Sept. 10, 2015	MTX	Phantom Stock Units	Common Stock (3)	—	—	3	Acquired
July 1, 2015	MTX	Phantom Stock Units	Common Stock (83)	—	—	83	Acquired
June 10, 2015	MTX	Phantom Stock Units	Common Stock (2)	—	—	2	Acquired
May 13, 2015	MTX	Phantom Stock Units	Common Stock (1,177)	—	—	1,177	Acquired
April 1, 2015	MTX	Phantom Stock Units	Common Stock (77)	—	—	77	Acquired
March 11, 2015	MTX	Phantom Stock Units	Common Stock (1)	—	—	1	Acquired
Jan. 2, 2015	MTX	Phantom Stock Units	Common Stock (82)	—	—	82	Acquired
Dec. 11, 2014	MTX	Phantom Stock Units	Common Stock (1)	—	—	1	Acquired
Oct. 1, 2014	MTX	Phantom Stock Units	Common Stock (88)	—	—	88	Acquired
Sept. 11, 2014	MTX	Phantom Stock Units	Common Stock (1)	—	—	1	Acquired
July 1, 2014	MTX	Phantom Stock Units	Common Stock (77)	—	—	77	Acquired
June 11, 2014	MTX	Phantom Stock Units	Common Stock (1)	—	—	1	Acquired
May 14, 2014	MTX	Phantom Stock Units	Common Stock (1,276)	—	—	1,276	Acquired
April 1, 2014	MTX	Phantom Stock Units	Common Stock (83)	—	—	83	Acquired
March 13, 2014	MTX	Phantom Stock Units	Common Stock (0)	—	—	0	Acquired
Jan. 2, 2014	MTX	Phantom Stock Units	Common Stock (83)	—	—	83	Acquired
Dec. 12, 2013	MTX	Phantom Stock Units	Common Stock (0)	—	—	0	Acquired
Oct. 1, 2013	MTX	Phantom Stock Units	Common Stock (181)	—	—	181	Acquired
Sept. 12, 2013	MTX	Phantom Stock Units	Common Stock (0)	—	—	0	Acquired
July 1, 2013	MTX	Phantom Stock Units	Common Stock (161)	—	—	161	Acquired

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

Initial ownership (Form 3) 1 holding

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
June 3, 2013	MTX	Common Stock	0	Direct