William Jl Rieflin

Insider

First SEC filing: June 16, 2021 · Latest: June 12, 2026

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 5 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

No open-market trades on record; showing all filings.

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 10, 2026	LYEL	A	9,250	—	—	9,250 Direct	—	Acquired	(price as of 2026-08-20)
June 14, 2024	LYEL	A	130,000	—	—	130,000 Direct	—	Acquired	(price as of 2026-08-20)
Sept. 8, 2023	LYEL	A	55,000	—	—	55,000 Direct	—	Acquired	(price as of 2026-08-20)
June 16, 2023	LYEL	A	65,000	—	—	65,000 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2022	LYEL	A	65,000	—	—	65,000 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.

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

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
June 10, 2026	LYEL	Option (right to buy)	Common Stock (9,250)	$13.22	June 9, 2036	9,250	Acquired
June 14, 2024	LYEL	Option (right to buy)	Common Stock (130,000)	$2.36	June 13, 2034	130,000	Acquired
Sept. 8, 2023	LYEL	Option (right to buy) [F1]	Common Stock (55,000)	$3.19	Sept. 7, 2033	55,000	Acquired
June 16, 2023	LYEL	Option (right to buy)	Common Stock (65,000)	$3.19	June 15, 2033	65,000	Acquired
June 8, 2022	LYEL	Option (right to buy)	Common Stock (65,000)	$5.31	June 7, 2032	65,000	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
June 16, 2021	LYEL	Option (right to buy)→ Common Stock (400,000)	400,000	Direct