BALOUSEK JOHN

Insider

First SEC filing: March 1, 2006 · Latest: March 1, 2006

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

CENTA selling May 13, 2020

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 78 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

78 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Aug. 5, 2020	CENTA	M	6,298	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 5, 2020	CENTA	F	5,433	$36.82	$200,043	2,288 Direct	-70.37%	Disposed	29.0% (price as of 2026-08-20)
Aug. 5, 2020	CENTA	M	6,298	$31.76	$200,024	7,721 Direct	+442.59%	Acquired	49.5% (price as of 2026-08-20)
May 13, 2020	CENTA	S	2,627	$33.18	$87,164	14,546 Indirect	-15.30%	Disposed	43.1% (price as of 2026-08-20)
May 13, 2020	CENTA	S	2,000	$35.42	$70,840	2,760 Indirect	-42.02%	Disposed	34.1% (price as of 2026-08-20)
March 31, 2020	CENTA	G	1,400	—	—	4,760 Indirect	-22.73%	Disposed	(price as of 2026-08-20)
Feb. 11, 2020	CENTA	A	705	—	—	1,423 Direct	+98.19%	Acquired	(price as of 2026-08-20)
Feb. 11, 2020	CENTA	A	7,043	—	—	7,043 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 11, 2020	CENTA	A	7,043	—	—	7,043 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 11, 2020	CENTA	A	705	—	—	2,595 Direct	+37.30%	Acquired	(price as of 2026-08-20)
July 15, 2019	CENTA	M	14,546	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
July 15, 2019	CENTA	M	14,546	$13.75	$200,008	16,001 Indirect	+999.73%	Acquired	245.4% (price as of 2026-08-20)
Feb. 12, 2019	CENTA	A	7,174	—	—	7,174 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 12, 2019	CENTA	A	718	—	—	1,890 Direct	+61.26%	Acquired	(price as of 2026-08-20)
Feb. 21, 2018	CENTA	S	5,010	$37.81	$189,428	1,455 Indirect	-77.49%	Disposed	25.6% (price as of 2026-08-20)
Feb. 13, 2018	CENTA	A	5,415	—	—	5,415 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 13, 2018	CENTA	A	542	—	—	6,182 Direct	+9.61%	Acquired	(price as of 2026-08-20)
Feb. 8, 2018	CENTA	M	6,762	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 8, 2018	CENTA	F	1,752	$38.06	$66,681	5,640 Direct	-23.70%	Disposed	24.8% (price as of 2026-08-20)
Feb. 8, 2018	CENTA	M	6,762	$9.86	$66,673	7,392 Direct	+1073.33%	Acquired	381.6% (price as of 2026-08-20)
Dec. 12, 2017	CENTA	S	13,000	$39.15	$508,950	5,160 Indirect	-71.59%	Disposed	21.3% (price as of 2026-08-20)
Feb. 17, 2017	CENTA	S 10b5-1	12,000	$35.50	$426,000	18,160 Indirect	-39.79%	Disposed	33.8% (price as of 2026-08-20)
Feb. 14, 2017	CENTA	A	6,298	—	—	6,298 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 14, 2017	CENTA	A	630	—	—	2,085 Direct	+43.30%	Acquired	(price as of 2026-08-20)
Aug. 26, 2016	CENTA	S 10b5-1	7,865	$25.04	$196,940	1,455 Direct	-84.39%	Disposed	89.6% (price as of 2026-08-20)
Aug. 25, 2016	CENTA	S 10b5-1	2,700	$24.86	$67,122	9,320 Direct	-22.46%	Disposed	91.0% (price as of 2026-08-20)
Aug. 22, 2016	CENTA	M	9,247	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 22, 2016	CENTA	M	6,761	—	—	6,762 Direct	-50.00%	Disposed	(price as of 2026-08-20)
Aug. 22, 2016	CENTA	F	2,722	$24.50	$66,689	12,020 Direct	-18.46%	Disposed	93.8% (price as of 2026-08-20)
Aug. 22, 2016	CENTA	M	9,247	$7.21	$66,671	14,742 Direct	+168.28%	Acquired	558.6% (price as of 2026-08-20)
Aug. 22, 2016	CENTA	F	2,721	$24.50	$66,664	5,495 Direct	-33.12%	Disposed	93.8% (price as of 2026-08-20)
Aug. 22, 2016	CENTA	M	6,761	$9.86	$66,663	8,216 Direct	+464.67%	Acquired	381.6% (price as of 2026-08-20)
May 31, 2016	CENTA	S	12,527	$18.64	$233,503	30,160 Direct	-29.35%	Disposed	154.8% (price as of 2026-08-20)
May 27, 2016	CENTA	S	12,344	$18.70	$230,833	42,687 Direct	-22.43%	Disposed	153.9% (price as of 2026-08-20)
May 26, 2016	CENTA	S	129	$18.65	$2,406	55,031 Direct	-0.23%	Disposed	154.6% (price as of 2026-08-20)
May 5, 2016	CENTA	S 10b5-1	27,314	$17.00	$464,338	1,455 Direct	-94.94%	Disposed	179.3% (price as of 2026-08-20)
March 18, 2016	CENTA	S 10b5-1	10,961	$16.00	$175,376	28,769 Direct	-27.59%	Disposed	196.8% (price as of 2026-08-20)
Feb. 9, 2016	CENTA	A	14,546	—	—	14,546 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 9, 2016	CENTA	A	1,455	—	—	39,730 Direct	+3.80%	Acquired	(price as of 2026-08-20)
Dec. 11, 2015	CENTA	S	11,130	$16.05	$178,636	38,275 Direct	-22.53%	Disposed	195.9% (price as of 2026-08-20)
Dec. 4, 2015	CENTA	M	6,761	—	—	13,523 Direct	-33.33%	Disposed	(price as of 2026-08-20)
Dec. 4, 2015	CENTA	M	18,493	—	—	9,247 Direct	-66.67%	Disposed	(price as of 2026-08-20)
Dec. 4, 2015	CENTA	M	22,397	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Dec. 4, 2015	CENTA	F	4,260	$15.65	$66,669	49,405 Direct	-7.94%	Disposed	203.4% (price as of 2026-08-20)
Dec. 4, 2015	CENTA	M	6,761	$9.86	$66,663	53,665 Direct	+14.41%	Acquired	381.6% (price as of 2026-08-20)
Dec. 4, 2015	CENTA	F	8,520	$15.65	$133,338	46,904 Direct	-15.37%	Disposed	203.4% (price as of 2026-08-20)
Dec. 4, 2015	CENTA	M	18,493	$7.21	$133,335	55,424 Direct	+50.07%	Acquired	558.6% (price as of 2026-08-20)
Dec. 4, 2015	CENTA	F	12,780	$15.65	$200,007	36,931 Direct	-25.71%	Disposed	203.4% (price as of 2026-08-20)
Dec. 4, 2015	CENTA	M	22,397	$8.93	$200,005	49,711 Direct	+82.00%	Acquired	431.8% (price as of 2026-08-20)
May 18, 2015	CENTA	S	1,995	$10.43	$20,808	27,314 Direct	-6.81%	Disposed	355.3% (price as of 2026-08-20)
May 15, 2015	CENTA	M	21,414	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 15, 2015	CENTA	F	19,419	$10.30	$200,016	29,309 Direct	-39.85%	Disposed	361.0% (price as of 2026-08-20)
May 15, 2015	CENTA	M	21,414	$9.34	$200,007	48,728 Direct	+78.40%	Acquired	408.4% (price as of 2026-08-20)
Feb. 10, 2015	CENTA	A	20,284	—	—	20,284 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 10, 2015	CENTA	A	2,029	—	—	27,314 Direct	+8.02%	Acquired	(price as of 2026-08-20)
Feb. 10, 2014	CENTA	A	27,740	—	—	27,740 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 10, 2014	CENTA	A	2,774	—	—	25,285 Direct	+12.32%	Acquired	(price as of 2026-08-20)
Feb. 11, 2013	CENTA	A	22,397	—	—	22,397 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 11, 2013	CENTA	A	2,240	—	—	22,511 Direct	+11.05%	Acquired	(price as of 2026-08-20)
Aug. 7, 2012	CENTA	S	8,419	$10.89	$91,683	20,271 Direct	-29.34%	Disposed	336.1% (price as of 2026-08-20)
Aug. 6, 2012	CENTA	M	30,582	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 6, 2012	CENTA	S	3,864	$11.00	$42,504	28,690 Direct	-11.87%	Disposed	331.7% (price as of 2026-08-20)
Aug. 6, 2012	CENTA	F	18,299	$10.93	$200,008	32,554 Direct	-35.98%	Disposed	334.5% (price as of 2026-08-20)
Aug. 6, 2012	CENTA	M	30,582	$6.54	$200,006	50,853 Direct	+150.87%	Acquired	626.1% (price as of 2026-08-20)
Feb. 13, 2012	CENTA	A	21,414	—	—	21,414 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 13, 2012	CENTA	A	2,142	—	—	20,271 Direct	+11.82%	Acquired	(price as of 2026-08-20)
May 19, 2011	CENTA	M	28,341	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 19, 2011	CENTA	S	28,341	$10.13	$287,094	18,129 Direct	-60.99%	Disposed	368.8% (price as of 2026-08-20)
May 19, 2011	CENTA	M	28,341	$4.94	$140,005	46,470 Direct	+156.33%	Acquired	861.3% (price as of 2026-08-20)
Feb. 14, 2011	CENTA	A	21,165	—	—	21,165 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 14, 2011	CENTA	A	2,117	—	—	18,129 Direct	+13.22%	Acquired	(price as of 2026-08-20)
Feb. 8, 2010	CENTA	A	22,076	—	—	22,076 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 8, 2010	CENTA	A	2,208	—	—	16,012 Direct	+16.00%	Acquired	(price as of 2026-08-20)
Feb. 9, 2009	CENTA	A	30,582	—	—	30,582 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 9, 2009	CENTA	A	3,059	—	—	13,804 Direct	+28.47%	Acquired	(price as of 2026-08-20)
Feb. 11, 2008	CENTA	A	28,341	—	—	28,341 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 11, 2008	CENTA	A	3,037	—	—	10,745 Direct	+39.40%	Acquired	(price as of 2026-08-20)
Nov. 29, 2007	CENTA	P	50,000	$4.87	$243,500	55,160 Direct	+968.99%	Acquired	875.1% (price as of 2026-08-20)
May 31, 2007	CENTA	M	5,924	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 31, 2007	CENTA	M	2,962	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 31, 2007	CENTA	F	4,984	$13.35	$66,536	7,708 Direct	-39.27%	Disposed	255.7% (price as of 2026-08-20)
May 31, 2007	CENTA	M	5,924	$11.23	$66,527	12,692 Direct	+87.53%	Acquired	322.9% (price as of 2026-08-20)
May 31, 2007	CENTA	F	2,327	$14.38	$33,462	5,160 Direct	-31.08%	Disposed	230.2% (price as of 2026-08-20)
May 31, 2007	CENTA	M	2,962	$11.30	$33,471	7,487 Direct	+65.46%	Acquired	320.2% (price as of 2026-08-20)
Feb. 12, 2007	CENTA	A	1,141	—	—	4,525 Direct	+33.72%	Acquired	(price as of 2026-08-20)
Feb. 12, 2007	CENTA	A	11,024	—	—	11,024 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 28, 2006	CENTA	M	2,247	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 28, 2006	CENTA	S	2,247	$54.21	$121,810	3,384 Direct	-39.90%	Disposed	-12.4% (price as of 2026-08-20)
Feb. 28, 2006	CENTA	M	2,247	$21.99	$49,412	5,631 Direct	+66.40%	Acquired	116.0% (price as of 2026-08-20)
Feb. 27, 2006	CENTA	M	2,300	—	—	2,247 Direct	-50.58%	Disposed	(price as of 2026-08-20)
Feb. 27, 2006	CENTA	S	2,300	$53.79	$123,717	3,384 Direct	-40.46%	Disposed	-11.7% (price as of 2026-08-20)
Feb. 27, 2006	CENTA	M	2,300	$21.99	$50,577	5,684 Direct	+67.97%	Acquired	116.0% (price as of 2026-08-20)
Feb. 13, 2006	CENTA	A	2,896	—	—	2,896 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 13, 2006	CENTA	A	311	—	—	3,384 Direct	+10.12%	Acquired	(price as of 2026-08-20)
Feb. 25, 2005	CENTA	M	10,928	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 25, 2005	CENTA	S	928	$45.03	$41,788	3,073 Direct	-23.19%	Disposed	5.5% (price as of 2026-08-20)
Feb. 25, 2005	CENTA	S	10,000	$45.00	$450,000	4,001 Direct	-71.42%	Disposed	5.5% (price as of 2026-08-20)
Feb. 25, 2005	CENTA	M	10,928	$9.15	$99,991	14,001 Direct	+355.61%	Acquired	419.0% (price as of 2026-08-20)
Feb. 7, 2005	CENTA	A	2,295	—	—	2,295 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 7, 2005	CENTA	A	230	—	—	3,073 Direct	+8.09%	Acquired	(price as of 2026-08-20)

Showing latest 100 of 105 transactions

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
Aug. 5, 2020	CENTA	Stock Option (Right to Buy)	Class A Common Stock (6,298)	$31.76	Aug. 9, 2020	6,298	Disposed
Feb. 11, 2020	CENTA	Stock Option (Right to Buy)	Class A Common Stock (7,043)	$28.40	Feb. 11, 2026	7,043	Acquired
Feb. 11, 2020	CENTA	Stock Option (Right to Buy)	Class A Common Stock (7,043)	$28.40	Feb. 11, 2026	7,043	Acquired
July 15, 2019	CENTA	Stock Option (Right to Buy)	Class A Common Stock (14,546)	$13.75	Aug. 9, 2019	14,546	Disposed
Feb. 12, 2019	CENTA	Stock Option (Right to Buy)	Class A Common Stock (7,174)	$27.88	Feb. 12, 2025	7,174	Acquired
Feb. 13, 2018	CENTA	Stock Option (Right to Buy)	Class A Common Stock (5,415)	$36.94	Aug. 13, 2021	5,415	Acquired
Feb. 8, 2018	CENTA	Stock Option (right to buy)	Class A Common Stock (6,762)	$9.86	Aug. 10, 2018	6,762	Disposed
Feb. 14, 2017	CENTA	Stock Option (Right to Buy)	Class A Common Stock (6,298)	$31.76	Aug. 9, 2020	6,298	Acquired
Aug. 22, 2016	CENTA	Stock Option (Right to Buy)	Class A Common Stock (9,247)	$7.21	Aug. 10, 2017	9,247	Disposed
Aug. 22, 2016	CENTA	Stock Option (Right to Buy)	Class A Common Stock (6,761)	$9.86	Aug. 10, 2018	6,761	Disposed
Feb. 9, 2016	CENTA	Stock Option (right to buy)	Class A Common Stock (14,546)	$13.75	Aug. 9, 2019	14,546	Acquired
Dec. 4, 2015	CENTA	Stock Option (Right to Buy)	Class A Common Stock (6,761)	$9.86	Aug. 10, 2018	6,761	Disposed
Dec. 4, 2015	CENTA	Stock Option (Right to Buy)	Class A Common Stock (18,493)	$7.21	Aug. 10, 2017	18,493	Disposed
Dec. 4, 2015	CENTA	Stock Option (Right to Buy)	Class A Common Stock (22,397)	$8.93	Aug. 11, 2016	22,397	Disposed
May 15, 2015	CENTA	Director Stock Option (right to buy)	Class A Common Stock (21,414)	$9.34	Aug. 13, 2015	21,414	Disposed
Feb. 10, 2015	CENTA	Director Stock Option (right to buy)	Class A Common Stock (20,284)	$9.86	Aug. 10, 2018	20,284	Acquired
Feb. 10, 2014	CENTA	Director Stock Option (right to buy)	Class A Common Stock (27,740)	$7.21	Aug. 10, 2017	27,740	Acquired
Feb. 11, 2013	CENTA	Director Stock Option (right to buy)	Class A Common Stock (22,397)	$8.93	Aug. 11, 2016	22,397	Acquired
Aug. 6, 2012	CENTA	Director Stock Option (right to buy)	Class A Common Stock (30,582)	$6.54	Aug. 9, 2012	30,582	Disposed
Feb. 13, 2012	CENTA	Director Stock Option (right to buy)	Class A Common Stock (21,414)	$9.34	Aug. 13, 2015	21,414	Acquired
May 19, 2011	CENTA	Director Stock Option (Right to Buy)	Class A Common Stock (28,341)	$4.94	Aug. 11, 2011	28,341	Disposed
Feb. 14, 2011	CENTA	Director Stock Option (right to buy)	Class A Common Stock (21,165)	$9.45	Aug. 14, 2014	21,165	Acquired
Feb. 8, 2010	CENTA	Director Stock Option (right to buy)	Class A Common Stock (22,076)	$9.06	Aug. 8, 2013	22,076	Acquired
Feb. 9, 2009	CENTA	Director Stock Option (right to buy)	Class A Common Stock (30,582)	$6.54	Aug. 9, 2012	30,582	Acquired
Feb. 11, 2008	CENTA	Director Stock Option (right to buy)	Class A Common Stock (28,341)	$4.94	Aug. 11, 2011	28,341	Acquired
May 31, 2007	CENTA	Director Stock Option (right to buy)	Class A Common Stock (5,924)	$11.23	Aug. 9, 2007	5,924	Disposed
May 31, 2007	CENTA	Director Stock Option (right to buy)	Common Stock (2,962)	$11.30	Aug. 9, 2007	2,962	Disposed
Feb. 12, 2007	CENTA	Director Stock Option (right to buy)	Class A Common Stock (11,024)	$12.70	Aug. 12, 2010	11,024	Acquired
Feb. 28, 2006	CENTA	Stock Option (right to buy)	Common Stock (2,247)	$21.99	Aug. 10, 2006	2,247	Disposed
Feb. 27, 2006	CENTA	Stock Option (right to buy)	Common Stock (2,300)	$21.99	Aug. 10, 2006	2,300	Disposed
Feb. 13, 2006	CENTA	Director Stock Option (right to buy)	Common Stock (2,896)	$48.35	Aug. 13, 2009	2,896	Acquired
Feb. 25, 2005	CENTA	Stock Option (right to buy)	Common Stock (10,928)	$9.15	Aug. 11, 2005	10,928	Disposed
Feb. 7, 2005	CENTA	Director Stock Option (right to buy)	Common Stock (2,295)	$43.58	Aug. 7, 2008	2,295	Acquired
Feb. 10, 2004	CENTA	Stock Option (right to buy)	Common Stock (7,000)	$7.22	Dec. 8, 2004	7,000	Disposed
Feb. 9, 2004	CENTA	Director Stock Option (right to buy)	Common Stock (2,962)	$33.76	Aug. 9, 2007	2,962	Acquired

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