Irving Weissman

Insider

First SEC filing: Feb. 12, 2010 · Latest: Feb. 12, 2010

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

MBOT selling April 16, 2009

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 49 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

49 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
April 1, 2016	MBOT	A	48,077	—	—	558,288 Direct	+9.42%	Acquired	(price as of 2026-08-21)
Jan. 1, 2016	MBOT	A	29,762	—	—	510,211 Direct	+6.19%	Acquired	(price as of 2026-08-21)
Jan. 1, 2016	MBOT	A	146,342	—	—	480,449 Direct	+43.80%	Acquired	(price as of 2026-08-21)
Oct. 1, 2015	MBOT	A	31,250	—	—	334,107 Direct	+10.32%	Acquired	(price as of 2026-08-21)
July 1, 2015	MBOT	A	23,149	—	—	302,857 Direct	+8.28%	Acquired	(price as of 2026-08-21)
April 30, 2015	MBOT	A	12,255	—	—	279,708 Direct	+4.58%	Acquired	(price as of 2026-08-21)
Jan. 1, 2015	MBOT	A	13,298	—	—	267,453 Direct	+5.23%	Acquired	(price as of 2026-08-21)
Jan. 1, 2015	MBOT	A	58,253	—	—	254,155 Direct	+29.74%	Acquired	(price as of 2026-08-21)
April 1, 2014	MBOT	A	9,329	—	—	212,466 Direct	+4.59%	Acquired	(price as of 2026-08-21)
Jan. 3, 2014	MBOT	A	10,163	—	—	161,836 Direct	+6.70%	Acquired	(price as of 2026-08-21)
Jan. 1, 2014	MBOT	A	41,301	—	—	203,137 Direct	+25.52%	Acquired	(price as of 2026-08-21)
Jan. 1, 2014	MBOT	A	39,273	—	—	201,109 Direct	+24.27%	Acquired	(price as of 2026-08-21)
Dec. 20, 2013	MBOT	A	643	$1.00	$643	151,673 Direct	+0.43%	Acquired	-99.9% (price as of 2026-08-21)
Oct. 1, 2013	MBOT	A	10,000	—	—	151,030 Direct	+7.09%	Acquired	(price as of 2026-08-21)
Oct. 1, 2013	MBOT	A	7,441	$1.68	$12,501	141,030 Direct	+5.57%	Acquired	-99.9% (price as of 2026-08-21)
Sept. 25, 2013	MBOT	A	723	$1.00	$723	133,589 Direct	+0.54%	Acquired	-99.9% (price as of 2026-08-21)
July 1, 2013	MBOT	A	7,576	—	—	132,866 Direct	+6.05%	Acquired	(price as of 2026-08-21)
June 28, 2013	MBOT	A	682	$1.00	$682	125,290 Direct	+0.55%	Acquired	-99.9% (price as of 2026-08-21)
April 1, 2013	MBOT	A	7,226	—	—	124,608 Direct	+6.16%	Acquired	(price as of 2026-08-21)
April 1, 2013	MBOT	A	1,404	$1.00	$1,404	117,382 Direct	+1.21%	Acquired	-99.9% (price as of 2026-08-21)
Jan. 3, 2013	MBOT	A	7,669	—	—	115,978 Direct	+7.08%	Acquired	(price as of 2026-08-21)
Oct. 22, 2012	MBOT	A	3,629	$1.00	$3,629	108,309 Direct	+3.47%	Acquired	-99.9% (price as of 2026-08-21)
Oct. 1, 2012	MBOT	A	10,000	—	—	104,680 Direct	+10.56%	Acquired	(price as of 2026-08-21)
Oct. 1, 2012	MBOT	A	6,068	—	—	94,680 Direct	+6.85%	Acquired	(price as of 2026-08-21)
July 2, 2012	MBOT	A	15,433	—	—	88,612 Direct	+21.09%	Acquired	(price as of 2026-08-21)
April 1, 2012	MBOT	A	11,262	—	—	73,179 Direct	+18.19%	Acquired	(price as of 2026-08-21)
Jan. 3, 2012	MBOT	A	15,244	—	—	61,917 Direct	+32.66%	Acquired	(price as of 2026-08-21)
Oct. 3, 2011	MBOT	A	6,189	—	—	46,673 Direct	+15.29%	Acquired	(price as of 2026-08-21)
Oct. 1, 2011	MBOT	A	1,000	—	—	40,484 Direct	+2.53%	Acquired	(price as of 2026-08-21)
July 1, 2011	MBOT	A	23,585	—	—	394,832 Direct	+6.35%	Acquired	(price as of 2026-08-21)
June 23, 2011	MBOT	A	1,110	$0.25	$278	357,510 Direct	+0.31%	Acquired	-100.0% (price as of 2026-08-21)
June 20, 2011	MBOT	A	13,737	—	—	371,247 Direct	+3.84%	Acquired	(price as of 2026-08-21)
Jan. 26, 2011	MBOT	A	3,519	$0.25	$880	356,400 Direct	+1.00%	Acquired	-100.0% (price as of 2026-08-21)
Oct. 1, 2010	MBOT	A	10,000	—	—	352,881 Direct	+2.92%	Acquired	(price as of 2026-08-21)
Oct. 1, 2010	MBOT	A	3,465	$0.25	$866	342,881 Direct	+1.02%	Acquired	-100.0% (price as of 2026-08-21)
Oct. 1, 2009	MBOT	A	10,000	—	—	493,736 Direct	+2.07%	Acquired	(price as of 2026-08-21)
April 16, 2009	MBOT	S	6,696	$1.70	$11,383	483,736 Direct	-1.37%	Disposed	-100.0% (price as of 2026-08-21)
April 16, 2009	MBOT	S	43,304	$1.70	$73,617	490,432 Direct	-8.11%	Disposed	-100.0% (price as of 2026-08-21)
April 2, 2009	MBOT	S	150,000	$1.72	$258,000	533,736 Direct	-21.94%	Disposed	-100.0% (price as of 2026-08-21)
Oct. 1, 2008	MBOT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
June 30, 2008	MBOT	S	47,813	$1.20	$57,376	814,062 Direct	-5.55%	Disposed	-100.0% (price as of 2026-08-21)
June 30, 2008	MBOT	S	1,800	$1.19	$2,142	861,875 Direct	-0.21%	Disposed	-100.0% (price as of 2026-08-21)
June 30, 2008	MBOT	S	3,387	$1.18	$3,997	863,675 Direct	-0.39%	Disposed	-100.0% (price as of 2026-08-21)
June 30, 2008	MBOT	S	7,000	$1.17	$8,190	867,062 Direct	-0.80%	Disposed	-100.0% (price as of 2026-08-21)
June 27, 2008	MBOT	S	500	$1.25	$625	874,062 Direct	-0.06%	Disposed	-100.0% (price as of 2026-08-21)
June 27, 2008	MBOT	S	3,200	$1.25	$4,000	874,562 Direct	-0.36%	Disposed	-100.0% (price as of 2026-08-21)
June 27, 2008	MBOT	S	3,900	$1.24	$4,836	877,762 Direct	-0.44%	Disposed	-100.0% (price as of 2026-08-21)
June 27, 2008	MBOT	S	500	$1.23	$615	881,662 Direct	-0.06%	Disposed	-100.0% (price as of 2026-08-21)
June 27, 2008	MBOT	S	5,700	$1.22	$6,954	882,162 Direct	-0.64%	Disposed	-100.0% (price as of 2026-08-21)
June 27, 2008	MBOT	S	4,100	$1.21	$4,961	887,862 Direct	-0.46%	Disposed	-100.0% (price as of 2026-08-21)
June 27, 2008	MBOT	S	2,100	$1.20	$2,520	891,962 Direct	-0.23%	Disposed	-100.0% (price as of 2026-08-21)
April 28, 2008	MBOT	S	7,346	$1.39	$10,211	921,262 Direct	-0.79%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	6,800	$1.42	$9,656	894,062 Direct	-0.75%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	9,170	$1.41	$12,930	900,862 Direct	-1.01%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	11,230	$1.40	$15,722	910,032 Direct	-1.22%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	7,346	$1.39	$10,211	921,262 Direct	-0.79%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	25,554	$1.38	$35,265	928,608 Direct	-2.68%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	300	$1.38	$414	954,162 Direct	-0.03%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	16,293	$1.37	$22,321	954,462 Direct	-1.68%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	3,307	$1.36	$4,498	970,755 Direct	-0.34%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	6,800	$1.42	$9,656	894,062 Direct	-0.75%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	9,170	$1.41	$12,930	900,862 Direct	-1.01%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	11,230	$1.40	$15,722	910,032 Direct	-1.22%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	25,554	$1.38	$35,265	928,608 Direct	-2.68%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	300	$1.38	$414	954,162 Direct	-0.03%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	16,293	$1.37	$22,321	954,462 Direct	-1.68%	Disposed	-100.0% (price as of 2026-08-21)
April 18, 2008	MBOT	S	3,307	$1.36	$4,498	970,755 Direct	-0.34%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	11,518	$1.58	$18,198	1,007,173 Direct	-1.13%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	7,882	$1.57	$12,375	1,018,691 Direct	-0.77%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	5,600	$1.56	$8,736	1,026,573 Direct	-0.54%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	4,008	$1.54	$6,172	1,032,173 Direct	-0.39%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	2,992	$1.53	$4,578	1,036,181 Direct	-0.29%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	1,000	$1.52	$1,520	1,039,173 Direct	-0.10%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	2,999	$1.51	$4,528	1,040,173 Direct	-0.29%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 21, 2007	MBOT	S	39,001	$1.50	$58,502	1,043,172 Direct	-3.60%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 20, 2007	MBOT	S	100	$1.59	$159	1,082,173 Direct	-0.01%	Disposed	-100.0% (price as of 2026-08-21)
Dec. 20, 2007	MBOT	S	24,900	$1.58	$39,342	1,082,273 Direct	-2.25%	Disposed	-100.0% (price as of 2026-08-21)
Oct. 1, 2007	MBOT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
Oct. 1, 2006	MBOT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
Oct. 1, 2005	MBOT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
May 24, 2005	MBOT	X	72,252	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 24, 2005	MBOT	J	61,468	$4.02	$247,101	1,092,662 Direct	-5.33%	Disposed	-100.0% (price as of 2026-08-21)
May 24, 2005	MBOT	X	72,252	$3.42	$247,102	1,154,130 Direct	+6.68%	Acquired	-100.0% (price as of 2026-08-21)
Oct. 1, 2004	MBOT	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
Jan. 1, 2004	MBOT	A	6,434	—	—	6,434 Direct	—	—	(price as of 2026-08-21)
Dec. 31, 2003	MBOT	A	3,468	—	—	3,468 Direct	—	Acquired	(price as of 2026-08-21)
Oct. 1, 2003	MBOT	A	15,000	—	—	15,000 Direct	—	Acquired	(price as of 2026-08-21)
Oct. 1, 2003	MBOT	A	7,225	—	—	7,225 Direct	—	—	(price as of 2026-08-21)
Sept. 30, 2003	MBOT	A	3,922	—	—	3,922 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
Oct. 1, 2008	MBOT	Stock Option (right to buy)	Common Stock	$1.03	Oct. 1, 2018	10,000	Acquired
Oct. 1, 2007	MBOT	Stock Option (right to buy)	Common Stock	$2.10	Oct. 1, 2017	10,000	Acquired
Oct. 1, 2006	MBOT	Stock Option (right to buy)	Common Stock	$2.13	Oct. 1, 2016	10,000	Acquired
Oct. 1, 2005	MBOT	Stock Option (right to buy)	Common Stock	$5.52	Oct. 1, 2015	10,000	Acquired
May 24, 2005	MBOT	Common Stock Warrant (right to buy)	Common Stock (72,252)	$3.42	July 12, 2005	72,252	Disposed
Oct. 1, 2004	MBOT	Stock Option (right to buy)	Common Stock	$1.56	Oct. 1, 2014	10,000	Acquired
Jan. 1, 2004	MBOT	Stock Option (right to buy)	Common Stock (6,434)	$0.10	Jan. 1, 2004	6,434	—
Dec. 31, 2003	MBOT	—	Common Stock (3,468)	$0.25	Dec. 31, 2013	3,468	Acquired
Oct. 1, 2003	MBOT	—	Common Stock (15,000)	$1.94	Oct. 1, 2013	15,000	Acquired
Oct. 1, 2003	MBOT	Stock Option (right to buy)	Common Stock (7,225)	$0.10	Oct. 1, 2013	7,225	—
Sept. 30, 2003	MBOT	—	Common Stock (3,922)	$0.25	Sept. 30, 2013	3,922	Acquired

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