Carolyn Katz

Insider

First SEC filing: Feb. 19, 2013 · Latest: Nov. 7, 2019

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

AMT selling Sept. 6, 2016

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 31 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

31 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 10, 2017	AMT	A	1,321	—	—	12,905 Direct	+11.40%	Acquired	(price as of 2026-08-21)
Sept. 6, 2016	AMT	S 10b5-1	2,100	$115.92	$243,432	14,484 Direct	-12.66%	Disposed	52.4% (price as of 2026-08-21)
Sept. 6, 2016	AMT	S 10b5-1	2,900	$116.64	$338,256	11,584 Direct	-20.02%	Disposed	51.5% (price as of 2026-08-21)
Aug. 8, 2016	AMT	S 10b5-1	10,000	$116.25	$1,162,500	16,584 Direct	-37.62%	Disposed	52.0% (price as of 2026-08-21)
July 6, 2016	AMT	M 10b5-1	10,000	$37.52	$375,200	26,584 Direct	+60.30%	Acquired	370.9% (price as of 2026-08-21)
July 6, 2016	AMT	M	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
June 1, 2016	AMT	S 10b5-1	5,000	$105.26	$526,300	16,584 Direct	-23.17%	Disposed	67.9% (price as of 2026-08-21)
May 2, 2016	AMT	S 10b5-1	794	$105.00	$83,370	21,584 Direct	-3.55%	Disposed	68.3% (price as of 2026-08-21)
March 10, 2016	AMT	A	1,584	—	—	22,378 Direct	+7.62%	Acquired	(price as of 2026-08-21)
Feb. 29, 2016	AMT	M	10,000	$31.50	$315,000	20,794 Direct	+92.64%	Acquired	460.9% (price as of 2026-08-21)
Feb. 29, 2016	AMT	M	10,000	—	—	0 Direct	—	Acquired	(price as of 2026-08-21)
March 10, 2015	AMT	A	794	—	—	10,794 Direct	+7.94%	Acquired	(price as of 2026-08-21)
March 10, 2015	AMT	A	4,971	—	—	4,971 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 18, 2014	AMT	M 10b5-1	10,000	$18.15	$181,500	10,000 Direct	—	Acquired	873.4% (price as of 2026-08-21)
Dec. 18, 2014	AMT	M	10,000	—	—	0 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 11, 2014	AMT	S 10b5-1	5,427	$100.16	$543,568	0 Direct	-100.00%	Disposed	76.4% (price as of 2026-08-21)
Nov. 11, 2014	AMT	S 10b5-1	3,750	$99.06	$371,475	5,427 Direct	-40.86%	Disposed	78.4% (price as of 2026-08-21)
Oct. 13, 2014	AMT	S 10b5-1	3,686	$93.82	$345,821	10,491 Direct	-26.00%	Disposed	88.3% (price as of 2026-08-21)
Oct. 13, 2014	AMT	S 10b5-1	1,314	$94.42	$124,068	9,177 Direct	-12.53%	Disposed	87.1% (price as of 2026-08-21)
Sept. 11, 2014	AMT	S 10b5-1	5,000	$97.15	$485,750	14,177 Direct	-26.07%	Disposed	81.9% (price as of 2026-08-21)
Aug. 11, 2014	AMT	S 10b5-1	5,000	$99.08	$495,400	19,177 Direct	-20.68%	Disposed	78.3% (price as of 2026-08-21)
Aug. 7, 2014	AMT	G	1,250	—	—	24,177 Direct	-4.92%	Disposed	(price as of 2026-08-21)
July 11, 2014	AMT	S 10b5-1	5,000	$91.10	$455,500	25,427 Direct	-16.43%	Disposed	93.9% (price as of 2026-08-21)
March 10, 2014	AMT	A	924	—	—	30,427 Direct	+3.13%	Acquired	(price as of 2026-08-21)
March 10, 2014	AMT	A	5,054	—	—	5,054 Direct	—	Acquired	(price as of 2026-08-21)
March 4, 2014	AMT	M	25,000	$12.11	$302,750	29,503 Direct	+555.19%	Acquired	1359.0% (price as of 2026-08-21)
March 4, 2014	AMT	M	25,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 11, 2013	AMT	A	813	—	—	4,503 Direct	+22.03%	Acquired	(price as of 2026-08-21)
March 11, 2013	AMT	A	3,239	—	—	3,239 Direct	—	Acquired	(price as of 2026-08-21)
March 12, 2012	AMT	A	1,009	—	—	7,322 Direct	+15.98%	Acquired	(price as of 2026-08-21)
March 12, 2012	AMT	A	3,590	—	—	3,590 Direct	—	Acquired	(price as of 2026-08-21)
March 10, 2011	AMT	A	1,231	—	—	6,313 Direct	+24.22%	Acquired	(price as of 2026-08-21)
March 10, 2011	AMT	A	3,653	—	—	3,653 Direct	—	Acquired	(price as of 2026-08-21)
March 10, 2010	AMT	A	1,450	—	—	5,082 Direct	+39.92%	Acquired	(price as of 2026-08-21)
March 10, 2010	AMT	A	4,167	—	—	4,167 Direct	—	Acquired	(price as of 2026-08-21)
March 10, 2009	AMT	A	2,202	—	—	3,632 Direct	+153.99%	Acquired	(price as of 2026-08-21)
March 10, 2009	AMT	A	7,152	—	—	7,152 Direct	—	Acquired	(price as of 2026-08-21)
March 17, 2008	AMT	A	1,430	—	—	1,430 Direct	—	Acquired	(price as of 2026-08-21)
March 17, 2008	AMT	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-21)
March 15, 2007	AMT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
March 1, 2006	AMT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
April 1, 2005	AMT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
March 4, 2004	AMT	A	25,000	—	—	25,000 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
July 6, 2016	AMT	Option to Purchase Common Stock [F2]	Common Stock (10,000)	$37.52	March 15, 2017	10,000	Disposed
Feb. 29, 2016	AMT	Option to Purchase Common Stock [F1]	Common Stock (10,000)	$31.50	March 1, 2016	10,000	Acquired
March 10, 2015	AMT	Option to Purchase Common Stock [F2]	Common Stock (4,971)	$94.57	March 10, 2025	4,971	Acquired
Dec. 18, 2014	AMT	Option to Purchase Common Stock	Common Stock (10,000)	$18.15	April 1, 2015	10,000	Acquired
March 10, 2014	AMT	Option to Purchase Common Stock [F2]	Common Stock (5,054)	$81.18	March 10, 2024	5,054	Acquired
March 4, 2014	AMT	Option to Purchase Common Stock	Common Stock (25,000)	$12.11	March 4, 2014	25,000	Disposed
March 11, 2013	AMT	Option to Purchase Common Stock [F2]	Common Stock (3,239)	$76.90	March 11, 2023	3,239	Acquired
March 12, 2012	AMT	Option to Purchase Common Stock [F2]	Common Stock (3,590)	$62.00	March 12, 2022	3,590	Acquired
March 10, 2011	AMT	Option to Purchase Class A Common Stock [F2]	Class A Common Stock (3,653)	$50.78	March 10, 2021	3,653	Acquired
March 10, 2010	AMT	Option to Purchase Class A Common Stock [F2]	Class A Common Stock (4,167)	$43.11	March 10, 2020	4,167	Acquired
March 10, 2009	AMT	Option to Purchase Class A Common Stock [F2]	Class A Common Stock (7,152)	$28.39	March 10, 2019	7,152	Acquired
March 17, 2008	AMT	Option to purchase Class A Common Stock [F2]	Class A Common Stock (5,000)	$37.70	March 17, 2018	5,000	Acquired
March 15, 2007	AMT	Option to Purchase Class A Common Stock [F1]	Class A Common Stock (10,000)	$37.52	March 15, 2017	10,000	Acquired
March 1, 2006	AMT	Option to Purchase Class A Common Stock [F1]	Class A Common Stock (10,000)	$31.50	March 1, 2016	10,000	Acquired
April 1, 2005	AMT	Option to Purchase Class A Common Stock [F1]	Class A Common Stock (10,000)	$18.15	April 1, 2015	10,000	Acquired
March 4, 2004	AMT	Option to purchase Class A Common Stock [F1]	Class A Common Stock (25,000)	$12.11	March 4, 2014	25,000	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
Nov. 7, 2019	CCOI	common stock	0	Direct