William Aliski

Insider

First SEC filing: Oct. 9, 2018 · Latest: Feb. 3, 2021

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

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 28 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

28 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 24, 2021	RARE	A	4,125	—	—	4,125 Direct	—	Acquired	(price as of 2026-08-20)
June 24, 2021	RARE	A	2,145	—	—	66,849 Direct	+3.32%	Acquired	(price as of 2026-08-20)
Feb. 23, 2021	RARE	G	1,000	—	—	64,704 Direct	-1.52%	Disposed	(price as of 2026-08-20)
Feb. 19, 2021	RARE	M	7,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 19, 2021	RARE	S	7,500	$149.01	$1,117,575	65,704 Direct	-10.25%	Disposed	-82.2% (price as of 2026-08-20)
Feb. 19, 2021	RARE	M	7,500	$97.85	$733,875	73,204 Direct	+11.41%	Acquired	-72.9% (price as of 2026-08-20)
Aug. 21, 2020	RARE	M	5,000	$58.74	$293,700	62,018 Direct	+8.77%	Acquired	-54.8% (price as of 2026-08-20)
Aug. 21, 2020	RARE	S	5,000	$86.57	$432,850	57,018 Direct	-8.06%	Disposed	-69.3% (price as of 2026-08-20)
Aug. 21, 2020	RARE	M	5,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
June 26, 2020	RARE	A	4,250	—	—	4,250 Direct	—	Acquired	(price as of 2026-08-20)
June 26, 2020	RARE	A	2,550	—	—	57,018 Direct	+4.68%	Acquired	(price as of 2026-08-20)
May 18, 2020	RARE	S	20,000	$74.02	$1,480,400	70,350 Indirect	-22.14%	Disposed	-64.1% (price as of 2026-08-20)
May 18, 2020	RARE	S	7,500	$74.65	$559,875	47,924 Direct	-13.53%	Disposed	-64.4% (price as of 2026-08-20)
May 18, 2020	RARE	M	7,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 18, 2020	RARE	M	7,500	$40.37	$302,775	55,424 Direct	+15.65%	Acquired	-34.2% (price as of 2026-08-20)
Sept. 18, 2019	XFOR	A	6,854	—	—	6,854 Direct	—	Acquired	(price as of 2026-08-20)
June 11, 2019	RARE	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-20)
June 11, 2019	RARE	A	3,000	—	—	47,924 Direct	+6.68%	Acquired	(price as of 2026-08-20)
Dec. 7, 2018	RARE	S 10b5-1	6,000	$49.69	$298,140	90,350 Indirect	-6.23%	Disposed	-46.6% (price as of 2026-08-20)
Nov. 8, 2018	RARE	S 10b5-1	6,000	$55.67	$334,020	96,350 Indirect	-5.86%	Disposed	-52.3% (price as of 2026-08-20)
Oct. 8, 2018	RARE	S 10b5-1	6,000	$73.38	$440,280	102,350 Indirect	-5.54%	Disposed	-63.8% (price as of 2026-08-20)
Aug. 8, 2018	RARE	S	3,750	$76.66	$287,475	72,610 Direct	-4.91%	Disposed	-65.4% (price as of 2026-08-20)
June 19, 2018	RARE	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-20)
June 19, 2018	RARE	A	3,000	—	—	76,360 Direct	+4.09%	Acquired	(price as of 2026-08-20)
April 19, 2018	RARE	S 10b5-1	650	$53.97	$35,080	108,350 Indirect	-0.60%	Disposed	-50.8% (price as of 2026-08-20)
Jan. 23, 2018	RARE	M	11,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Jan. 23, 2018	RARE	M	11,500	$21.00	$241,500	73,360 Direct	+18.59%	Acquired	26.5% (price as of 2026-08-20)
June 22, 2017	RARE	A	3,750	—	—	3,750 Direct	—	Acquired	(price as of 2026-08-20)
June 22, 2017	RARE	A	1,875	—	—	61,860 Direct	+3.13%	Acquired	(price as of 2026-08-20)
July 27, 2015	RARE	S 10b5-1	400	$122.58	$49,032	109,000 Indirect	-0.37%	Disposed	-78.3% (price as of 2026-08-20)
May 27, 2015	RARE	S 10b5-1	2,000	$85.94	$171,880	109,400 Indirect	-1.80%	Disposed	-69.1% (price as of 2026-08-20)
May 12, 2015	RARE	S 10b5-1	10,500	$68.65	$720,825	111,400 Indirect	-8.61%	Disposed	-61.3% (price as of 2026-08-20)
Dec. 4, 2014	RARE	S	3,109	$42.46	$132,008	60,010 Direct	-4.93%	Disposed	-37.4% (price as of 2026-08-20)
Dec. 4, 2014	RARE	S	2,891	$41.83	$120,931	63,119 Direct	-4.38%	Disposed	-36.5% (price as of 2026-08-20)
Oct. 20, 2014	RARE	M	29,108	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Oct. 20, 2014	RARE	M	29,108	$3.01	$87,615	66,010 Direct	+78.88%	Acquired	782.4% (price as of 2026-08-20)
July 10, 2014	RARE	A	7,500	—	—	7,500 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 5, 2014	RARE	C	266,343	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 5, 2014	RARE	C	84,970	—	—	121,900 Indirect	+230.08%	Acquired	(price as of 2026-08-20)
Feb. 5, 2014	RARE	J	29,108	—	—	0 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 5, 2014	RARE	J	91,241	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Jan. 30, 2014	RARE	A	17,500	—	—	17,500 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 30, 2014	RARE	P	5,000	$21.00	$105,000	36,903 Direct	+15.67%	Acquired	26.5% (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
June 24, 2021	RARE	Stock Option (Right to Buy)	Common Stock (4,125)	$93.20	June 24, 2031	4,125	Acquired
Feb. 19, 2021	RARE	Stock Option (Right to Buy)	Common Stock (7,500)	$97.85	June 18, 2025	7,500	Disposed
Aug. 21, 2020	RARE	Stock Option (Right to Buy)	Common Stock (5,000)	$58.74	June 11, 2029	5,000	Disposed
June 26, 2020	RARE	Stock Option (Right to Buy)	Common Stock (4,250)	$76.58	June 26, 2030	4,250	Acquired
May 18, 2020	RARE	Stock Option (Right to Buy)	Common Stock (7,500)	$40.37	July 10, 2024	7,500	Disposed
Sept. 18, 2019	XFOR	Stock Option (right to buy)	Common Stock (6,854)	$14.04	Sept. 18, 2029	6,854	Acquired
June 11, 2019	RARE	Stock Option (Right to Buy)	Common Stock (5,000)	$58.74	June 11, 2029	5,000	Acquired
June 19, 2018	RARE	Stock Option (Right to Buy)	Common Stock (5,000)	$80.69	June 19, 2028	5,000	Acquired
Jan. 23, 2018	RARE	Employee Stock Option (Right to Buy)	Common Stock (11,500)	$21.00	Jan. 29, 2024	11,500	Disposed
June 22, 2017	RARE	Employee Stock Option (Right to Buy)	Common Stock (3,750)	$65.66	June 22, 2027	3,750	Acquired
Oct. 20, 2014	RARE	Warrant to Purchase Common Stock (Right to Buy)	Common Stock (29,108)	$3.01	Feb. 23, 2021	29,108	Disposed
July 10, 2014	RARE	Stock Option (Right to Buy)	Common Stock (7,500)	$40.37	July 9, 2024	7,500	Acquired
Feb. 5, 2014	RARE	Series A Preferred Stock	Common Stock	—	—	266,343	Disposed
Feb. 5, 2014	RARE	Warrant to Purchase Common Stock (Right to Buy)	Common Stock (29,108)	$3.01	Feb. 23, 2021	29,108	Acquired
Feb. 5, 2014	RARE	Warrant to Purchase Series A Preferred Stock (Right to Buy)	Series A Preferred Stock (91,241)	$0.96	Feb. 23, 2021	91,241	Disposed
Jan. 30, 2014	RARE	Stock Option (Right to Buy)	Common Stock (17,500)	$21.00	Jan. 29, 2024	17,500	Acquired

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

Initial ownership (Form 3) 4 holdings

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

Date	Ticker	Security	Shares	Ownership
Oct. 9, 2018	RARE	Common Stock	36,930	Indirect
Oct. 9, 2018	RARE	Series A Preferred Stock→ Common Stock (266,343)	266,343	Indirect
Jan. 30, 2014	RARE	Common Stock	31,903	Direct
Jan. 30, 2014	RARE	Warrant to Purchase Series A Preferred Stock (Right to Buy)→ Common Stock (91,241)	91,241	Direct