Matthew Bennett Arnold

Insider

First SEC filing: Jan. 25, 2018 · Latest: Jan. 25, 2018

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 7 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

7 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Dec. 10, 2020	SLDB	A	432,432	$3.70	$1,599,998	3,933,429 Direct	+12.35%	Acquired	-83.3% (price as of 2026-08-20)
June 16, 2020	SLDB	A	30,000	—	—	30,000 Direct	—	Acquired	(price as of 2026-08-20)
July 25, 2019	SLDB	A	677,419	$4.65	$3,149,998	3,500,997 Direct	+23.99%	Acquired	-86.7% (price as of 2026-08-20)
June 14, 2019	SLDB	G	562,715	—	—	2,823,578 Direct	-16.62%	Disposed	(price as of 2026-08-20)
June 13, 2019	SLDB	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 14, 2019	SLDB	S 10b5-1	3,300	$32.20	$106,260	3,386,293 Direct	-0.10%	Disposed	-98.1% (price as of 2026-08-20)
Jan. 14, 2019	SLDB	S 10b5-1	1,700	$31.60	$53,720	3,389,593 Direct	-0.05%	Disposed	-98.0% (price as of 2026-08-20)
Jan. 7, 2019	SLDB	S 10b5-1	5,000	$30.08	$150,400	3,391,293 Direct	-0.15%	Disposed	-97.9% (price as of 2026-08-20)
Dec. 13, 2018	SLDB	A	8,165	—	—	8,165 Direct	—	Acquired	(price as of 2026-08-20)
July 25, 2018	SLDB	A	1,835	—	—	1,835 Direct	—	Acquired	(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.

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
June 16, 2020	SLDB	Director Stock Option (Right to Buy)	Common Stock (30,000)	$3.03	June 16, 2030	30,000	Acquired
June 13, 2019	SLDB	Director Stock Option (Right to Buy)	Common Stock (10,000)	$5.26	June 13, 2029	10,000	Acquired
Dec. 13, 2018	SLDB	Director Stock Option (Right to Buy)	Common Stock (8,165)	$23.58	Dec. 13, 2028	8,165	Acquired
July 25, 2018	SLDB	Director Stock Option (Right to Buy)	Common Stock (1,835)	$37.89	July 25, 2028	1,835	Acquired

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

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

Date	Ticker	Security	Shares	Ownership
Jan. 25, 2018	SLDB	Common Stock	3,396,293	Direct