Chand R Viswanathan

Insider

First SEC filing: Aug. 15, 2006 · Latest: Aug. 15, 2006

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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

OSIS selling March 8, 2010

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 15 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

15 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 8, 2010	OSIS	S	1,000	$31.16	$31,160	0 Indirect	-100.00%	Disposed	604.3% (price as of 2026-08-20)
March 1, 2010	OSIS	S	2,000	$31.00	$62,000	3,688 Direct	-35.16%	Disposed	608.0% (price as of 2026-08-20)
Feb. 26, 2010	OSIS	S	2,000	$30.80	$61,600	5,688 Direct	-26.01%	Disposed	612.6% (price as of 2026-08-20)
Sept. 23, 2009	OSIS	S	4,241	$17.75	$75,278	59,250 Direct	-6.68%	Disposed	1136.5% (price as of 2026-08-20)
Sept. 8, 2009	OSIS	A	3,000	—	—	7,688 Direct	+63.99%	Acquired	(price as of 2026-08-20)
Aug. 4, 2008	OSIS	A	8,750	$22.36	$195,650	63,491 Direct	+15.98%	Acquired	881.5% (price as of 2026-08-20)
Aug. 4, 2008	OSIS	A	2,188	—	—	4,688 Direct	+87.52%	Acquired	(price as of 2026-08-20)
Jan. 22, 2008	OSIS	A	4,241	$14.50	$61,494	54,741 Direct	+8.40%	Acquired	1413.6% (price as of 2026-08-20)
Sept. 17, 2007	OSIS	A	7,500	$20.02	$150,150	50,500 Direct	+17.44%	Acquired	996.3% (price as of 2026-08-20)
Sept. 17, 2007	OSIS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
March 23, 2007	OSIS	S	5,000	$25.66	$128,300	38,000 Direct	-11.63%	Disposed	755.3% (price as of 2026-08-20)
Jan. 29, 2007	OSIS	M	5,000	$19.95	$99,750	43,000 Direct	-10.42%	Disposed	1000.1% (price as of 2026-08-20)
Jan. 29, 2007	OSIS	M	5,000	$19.95	$99,750	5,000 Indirect	—	Acquired	1000.1% (price as of 2026-08-20)
Nov. 30, 2006	OSIS	A	5,000	$18.99	$94,950	48,000 Direct	+11.63%	Acquired	1055.7% (price as of 2026-08-20)
Sept. 27, 2006	OSIS	A	5,000	$18.99	$94,950	43,000 Direct	+13.16%	Acquired	1055.7% (price as of 2026-08-20)
July 7, 2006	OSIS	A	7,500	$18.16	$136,200	38,000 Direct	+24.59%	Acquired	1108.5% (price as of 2026-08-20)
Dec. 19, 2005	OSIS	M	2,000	$4.29	$8,580	30,500 Direct	-6.15%	Disposed	5015.9% (price as of 2026-08-20)
Dec. 19, 2005	OSIS	S	2,000	$18.67	$37,340	0 Direct	-100.00%	Disposed	1075.5% (price as of 2026-08-20)
Nov. 11, 2005	OSIS	A	7,500	$18.53	$138,975	32,500 Direct	+30.00%	Acquired	1084.4% (price as of 2026-08-20)
Nov. 26, 2004	OSIS	A	5,000	$20.91	$104,550	25,000 Direct	+25.00%	Acquired	949.6% (price as of 2026-08-20)
Feb. 13, 2004	OSIS	A	5,000	$19.86	$99,300	20,000 Direct	+33.33%	Acquired	1005.1% (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
Sept. 23, 2009	OSIS	Option to Purchase Common Stock	Common Stock (4,241)	$14.50	Oct. 25, 2009	4,241	Disposed
Aug. 4, 2008	OSIS	Option to Purchase Common Stock	Common Stock (8,750)	$22.36	Aug. 3, 2018	8,750	Acquired
Jan. 22, 2008	OSIS	Option to Purchase Common Stock	Common Stock (4,241)	$14.50	Oct. 25, 2009	4,241	Acquired
Sept. 17, 2007	OSIS	Option to Purchase Common Stock	Common Stock (7,500)	$20.02	Sept. 16, 2012	7,500	Acquired
March 23, 2007	OSIS	Option to Purchase Common Stock	Common Stock (5,000)	$16.31	Jan. 8, 2008	5,000	Disposed
Jan. 29, 2007	OSIS	Option to Purchase Common Stock	Common Stock (5,000)	$19.95	Jan. 29, 2007	5,000	Disposed
Nov. 30, 2006	OSIS	Option to Purchase Common Stock	Common Stock (5,000)	$18.99	Nov. 29, 2011	5,000	Acquired
Sept. 27, 2006	OSIS	Option to Purchase Common Stock	Common Stock (5,000)	$18.99	Sept. 26, 2011	5,000	Acquired
July 7, 2006	OSIS	Option to Purchase Common Stock	Common Stock (7,500)	$18.16	July 7, 2011	7,500	Acquired
Dec. 19, 2005	OSIS	Option to Purchase Common Stock	Common Stock (2,000)	$4.29	June 14, 2006	2,000	Disposed
Nov. 11, 2005	OSIS	Option to Purchase Common Stock	Common Stock (7,500)	$18.53	Nov. 11, 2010	7,500	Acquired
Nov. 26, 2004	OSIS	Option to Purchase Common Stock	Common Stock (5,000)	$20.91	Nov. 26, 2009	5,000	Acquired
Feb. 13, 2004	OSIS	Option to Purchase Common Stock	Common Stock (5,000)	$19.86	Feb. 13, 2009	5,000	Acquired

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