Katherine Bach Kalin

Insider

First SEC filing: Aug. 16, 2022 · Latest: Aug. 16, 2022

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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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

SLS buying Nov. 19, 2025

Insider transactions

1 buys (P) 0 sells (S) Net: $100,806 + 8 non-open-market transactions below Avg return of open purchases vs now: 764.8% 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

8 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Jan. 7, 2026	SLS	A	50,000	—	—	154,400 Direct	+47.89%	Acquired	(price as of 2026-08-20)
Nov. 19, 2025	SLS	P	63,400	$1.59	$100,806	104,400 Direct	+154.63%	Acquired	764.8% (price as of 2026-08-20)
May 22, 2025	SLS	P	20,000	$1.80	$36,000	41,000 Direct	+95.24%	Acquired	663.9% (price as of 2026-08-20)
Jan. 10, 2025	SLS	A	18,500	—	—	18,500 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 10, 2025	SLS	A	12,500	—	—	21,000 Direct	+147.06%	Acquired	(price as of 2026-08-20)
Jan. 22, 2024	SLS	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 22, 2024	SLS	A	6,000	—	—	8,500 Direct	+240.00%	Acquired	(price as of 2026-08-20)
Feb. 2, 2023	SLS	A	9,500	—	—	9,500 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 2, 2023	SLS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 13, 2022	SLS	A	19,000	—	—	19,000 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.

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
Jan. 10, 2025	SLS	Stock Option (Right to Buy)	Common Stock (18,500)	$0.95	Jan. 10, 2035	18,500	Acquired
Jan. 22, 2024	SLS	Stock Option (Right to Buy)	Common Stock (10,000)	$0.52	Jan. 22, 2034	10,000	Acquired
Feb. 2, 2023	SLS	Stock Option (Right to Buy)	Common Stock (9,500)	$3.34	Feb. 2, 2033	9,500	Acquired
Aug. 13, 2022	SLS	Stock Option (Right to Buy)	Common Stock (19,000)	$3.10	Aug. 13, 2032	19,000	Acquired

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

Initial ownership (Form 3) 1 holding

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

Date	Ticker	Security	Shares	Ownership
Aug. 16, 2022	SLS	Common Stock	0	Direct