LYEL

Lyell Immunopharma, Inc.

Insider trading activity for Lyell Immunopharma, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

-$211.3K

net selling

Bought(0 · 0 insiders): $0
Sold(10 · 6 insiders): $211.3K

Past 6 months

-$251.9K

net selling

Bought(0 · 0 insiders): $0
Sold(15 · 6 insiders): $251.9K

Past 12 months

+$24.4M

net buying

Bought(2 · 2 insiders): $25M
Sold(28 · 6 insiders): $604.6K

Transaction history

The 81 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Sep 10	Shook David	Chief Medical Officer	SSELL	500	$12.70	$6.4K	-2.4%	Open the original filing on SEC.gov
Sep 10	Aguirre Jarrad Mattieu	Chief Medical Officer	AGRANT◆	47,500	—	—	—	Open the original filing on SEC.gov
Aug 21	Hill Stephen J.	Chief Operating Officer	SSELL	989	$15.54	$15.4K	-5.5%	Open the original filing on SEC.gov
Aug 21	Seely Lynn	President and CEO	SSELL	9,589	$15.54	$149K	-13.1%	Open the original filing on SEC.gov
Aug 21	Lee Gary K.	Chief Scientific Officer	SSELL	1,457	$15.54	$22.6K	-8.2%	Open the original filing on SEC.gov
Aug 10	Seely Lynn	President and CEO	SSELL	390	$14.34	$5.6K	-0.5%	Open the original filing on SEC.gov
Aug 10	Lee Gary K.	Chief Scientific Officer	SSELL	131	$14.34	$1.9K	-0.7%	Open the original filing on SEC.gov
Aug 10	Hill Stephen J.	Chief Operating Officer	SSELL	89	$14.34	$1.3K	-0.5%	Open the original filing on SEC.gov
Aug 10	Bulis Veronica Sanchez	VP, Corporate Controller	SSELL	621	$14.34	$8.9K	-4.0%	Open the original filing on SEC.gov
Jul 27	Innovative Cellular…	10% Owner	JOTHER	44,000	—	—	-1.6%	Open the original filing on SEC.gov
Jul 27	Innovative Cellular…	10% Owner	JOTHER	38,500	—	—	-1.4%	Open the original filing on SEC.gov
Jul 17	Innovative Cellular…	10% Owner	SSELL◷	10	$13.70	$137	0.0%	Open the original filing on SEC.gov
Jul 16	Innovative Cellular…	10% Owner	SSELL◷	10	$13.73	$137	0.0%	Open the original filing on SEC.gov
Jun 29	Innovative Cellular…	10% Owner	JOTHER	76,000	—	—	-2.6%	Open the original filing on SEC.gov
Jun 15	Innovative Cellular…	10% Owner	JOTHER	66,500	—	—	-2.2%	Open the original filing on SEC.gov
Jun 10	Shook David	Chief Medical Officer	SSELL	1,977	$12.64	$25K	-8.6%	Open the original filing on SEC.gov
Jun 10	Nabel Elizabeth G	Director	AGRANT◆	9,250	—	—	—	Open the original filing on SEC.gov
Jun 10	Ramachandra Sumant	Director	AGRANT◆	9,250	—	—	—	Open the original filing on SEC.gov
Jun 10	Rieflin William Jl	Director	AGRANT◆	9,250	—	—	—	Open the original filing on SEC.gov
Jun 10	Klausner Richard	Director	AGRANT◆	9,250	—	—	—	Open the original filing on SEC.gov
Jun 10	Friedman Cathy	Director	AGRANT◆	9,250	—	—	—	Open the original filing on SEC.gov
Jun 10	Bachleda Mark	Director	AGRANT◆	9,250	—	—	—	Open the original filing on SEC.gov
Jun 10	Brawley Otis W	Director	AGRANT◆	9,250	—	—	—	Open the original filing on SEC.gov
May 11	Seely Lynn	President and CEO	SSELL	388	$18.91	$7.3K	-0.5%	Open the original filing on SEC.gov
May 11	Lee Gary K.	Chief Scientific Officer	SSELL	130	$18.92	$2.5K	-0.7%	Open the original filing on SEC.gov
May 11	Hill Stephen J.	Chief Operating Officer	SSELL	89	$18.92	$1.7K	-0.5%	Open the original filing on SEC.gov
May 11	Bulis Veronica Sanchez	VP, Corporate Controller	SSELL	217	$18.91	$4.1K	-1.4%	Open the original filing on SEC.gov
Mar 9	Shah Smital	Chief Fin. and Bus.…	AGRANT◆	140,000	—	—	—	Open the original filing on SEC.gov
Mar 6	ARCH Venture Fund XIII,…	10% Owner	PBUY★	488,090	$25.61	$12.5M	+52.0%	Open the original filing on SEC.gov
Mar 6	ARCH Venture Partners…	10% Owner	PBUY★	488,090	$25.61	$12.5M	+52.0%	Open the original filing on SEC.gov
Feb 11	Seely Lynn	President and CEO	SSELL	7,455	$23.39	$174.4K	-9.1%	Open the original filing on SEC.gov
Feb 11	Lee Gary K.	Chief Scientific Officer	SSELL	1,671	$23.39	$39.1K	-9.0%	Open the original filing on SEC.gov
Feb 11	Hill Stephen J.	Chief Operating Officer	SSELL	1,236	$23.39	$28.9K	-6.5%	Open the original filing on SEC.gov
Feb 10	Shook David	Chief Medical Officer	AGRANT◆	50,000	—	—	—	Open the original filing on SEC.gov
Feb 10	Meltz Mark A	General Counsel	AGRANT◆	50,000	—	—	—	Open the original filing on SEC.gov
Feb 10	Seely Lynn	President and CEO	AGRANT◆	155,000	—	—	—	Open the original filing on SEC.gov
Feb 10	Seely Lynn	President and CEO	SSELL	438	$23.12	$10.1K	-0.5%	Open the original filing on SEC.gov
Feb 10	Lee Gary K.	Chief Scientific Officer	AGRANT◆	50,000	—	—	—	Open the original filing on SEC.gov
Feb 10	Lee Gary K.	Chief Scientific Officer	SSELL	147	$23.12	$3.4K	-0.8%	Open the original filing on SEC.gov
Feb 10	Hill Stephen J.	Chief Operating Officer	AGRANT◆	65,000	—	—	—	Open the original filing on SEC.gov
Feb 10	Hill Stephen J.	Chief Operating Officer	SSELL	109	$23.12	$2.5K	-0.6%	Open the original filing on SEC.gov
Feb 10	Bulis Veronica Sanchez	VP, Corporate Controller	SSELL	254	$23.12	$5.9K	-1.6%	Open the original filing on SEC.gov
Feb 10	Bulis Veronica Sanchez	VP, Corporate Controller	AGRANT	8,750	—	—	+122.5%	Open the original filing on SEC.gov
Feb 9	Seely Lynn	President and CEO	AGRANT	20,000	—	—	+32.2%	Open the original filing on SEC.gov
Feb 9	Lee Gary K.	Chief Scientific Officer	AGRANT	4,000	—	—	+27.1%	Open the original filing on SEC.gov
Feb 9	Hill Stephen J.	Chief Operating Officer	AGRANT	4,000	—	—	+26.4%	Open the original filing on SEC.gov
Dec 30, 2025	Bulis Veronica Sanchez	VP, Corporate Controller	SSELL	936	$32.32	$30.3K	-11.6%	Open the original filing on SEC.gov
Dec 24, 2025	Bulis Veronica Sanchez	VP, Corporate Controller	SSELL	1,136	$38.67	$43.9K	-12.3%	Open the original filing on SEC.gov
Nov 10, 2025	Seely Lynn	President and CEO	SSELL	412	$16.11	$6.6K	-0.6%	Open the original filing on SEC.gov
Nov 10, 2025	Lee Gary K.	Chief Scientific Officer	SSELL	138	$16.16	$2.2K	-0.9%	Open the original filing on SEC.gov
Nov 10, 2025	Hill Stephen J.	Chief Operating Officer	SSELL	95	$16.12	$1.5K	-0.6%	Open the original filing on SEC.gov
Nov 10, 2025	Bulis Veronica Sanchez	VP, Corporate Controller	SSELL	239	$16.10	$3.8K	-2.5%	Open the original filing on SEC.gov
Oct 27, 2025	Seely Lynn	President and CEO	AGRANT◆	175,000	—	—	—	Open the original filing on SEC.gov
Oct 27, 2025	Lee Gary K.	Chief Scientific Officer	AGRANT◆	68,000	—	—	—	Open the original filing on SEC.gov
Oct 27, 2025	Hill Stephen J.	Chief Operating Officer	AGRANT◆	75,000	—	—	—	Open the original filing on SEC.gov
Aug 21, 2025	Seely Lynn	President and CEO	SSELL	7,257	$10.54	$76.5K	-9.7%	Open the original filing on SEC.gov
Aug 21, 2025	Newton Charles W.	Chief Financial Officer	SSELL	1,453	$10.54	$15.3K	-8.7%	Open the original filing on SEC.gov
Aug 21, 2025	Lee Gary K.	Chief Scientific Officer	SSELL	1,453	$10.54	$15.3K	-8.6%	Open the original filing on SEC.gov
Aug 21, 2025	Hill Stephen J.	Chief Operating Officer	SSELL	1,004	$10.54	$10.6K	-6.0%	Open the original filing on SEC.gov
Aug 20, 2025	Seely Lynn	President and CEO	AGRANT	40,000	—	—	+114.9%	Open the original filing on SEC.gov
Aug 20, 2025	Newton Charles W.	Chief Financial Officer	AGRANT	8,000	—	—	+91.3%	Open the original filing on SEC.gov
Aug 20, 2025	Lee Gary K.	Chief Scientific Officer	AGRANT	8,000	—	—	+89.3%	Open the original filing on SEC.gov
Aug 20, 2025	Hill Stephen J.	Chief Operating Officer	AGRANT	8,000	—	—	+90.4%	Open the original filing on SEC.gov
Aug 12, 2025	Seely Lynn	President and CEO	SSELL	406	$10.34	$4.2K	-1.1%	Open the original filing on SEC.gov
Aug 12, 2025	Newton Charles W.	Chief Financial Officer	SSELL	136	$10.34	$1.4K	-1.5%	Open the original filing on SEC.gov
Aug 12, 2025	Lee Gary K.	Chief Scientific Officer	SSELL	136	$10.34	$1.4K	-1.5%	Open the original filing on SEC.gov
Aug 12, 2025	Hill Stephen J.	Chief Operating Officer	SSELL	94	$10.34	$972	-1.1%	Open the original filing on SEC.gov
Aug 11, 2025	Seely Lynn	President and CEO	SSELL	391	$10.53	$4.1K	-1.1%	Open the original filing on SEC.gov
Aug 11, 2025	Newton Charles W.	Chief Financial Officer	SSELL	131	$10.53	$1.4K	-1.5%	Open the original filing on SEC.gov
Aug 11, 2025	Lee Gary K.	Chief Scientific Officer	SSELL	131	$10.53	$1.4K	-1.4%	Open the original filing on SEC.gov
Aug 11, 2025	Hill Stephen J.	Chief Operating Officer	SSELL	91	$10.53	$958	-1.0%	Open the original filing on SEC.gov
Jun 9, 2025	Meltz Mark A	General Counsel	AGRANT◆	100,000	—	—	—	Open the original filing on SEC.gov
Jun 9, 2025	Shook David	Chief Medical Officer	AGRANT◆	43,750	—	—	—	Open the original filing on SEC.gov
Jun 9, 2025	Shook David	Chief Medical Officer	AGRANT	21,900	—	—	—	Open the original filing on SEC.gov
Jun 9, 2025	Bachleda Mark	Director	AGRANT◆	13,000	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Rieflin William Jl	Director	AGRANT◆	130,000	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Nabel Elizabeth G	Director	AGRANT◆	130,000	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Ramachandra Sumant	Director	AGRANT◆	130,000	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Klausner Richard	Director	AGRANT◆	130,000	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Friedman Cathy	Director	AGRANT◆	130,000	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Brawley Otis W	Director	AGRANT◆	130,000	—	—	—	Open the original filing on SEC.gov

SSELL$6.4K

Shook David · Chief Medical…Sep 10

500 sh @ $12.70 · -2.4% own

AGRANT◆—

Aguirre Jarrad Mattieu · Chief Medical…Sep 10

47,500 sh

SSELL$15.4K

Hill Stephen J. · Chief Operating…Aug 21

989 sh @ $15.54 · -5.5% own

SSELL$149K

Seely Lynn · President and CEOAug 21

9,589 sh @ $15.54 · -13.1% own

SSELL$22.6K

Lee Gary K. · Chief Scientific…Aug 21

1,457 sh @ $15.54 · -8.2% own

SSELL$5.6K

Seely Lynn · President and CEOAug 10

390 sh @ $14.34 · -0.5% own

SSELL$1.9K

Lee Gary K. · Chief Scientific…Aug 10

131 sh @ $14.34 · -0.7% own

SSELL$1.3K

Hill Stephen J. · Chief Operating…Aug 10

89 sh @ $14.34 · -0.5% own

SSELL$8.9K

Bulis Veronica Sanchez · VP, Corporate…Aug 10

621 sh @ $14.34 · -4.0% own

JOTHER—

Innovative Cellular… · 10% OwnerJul 27

44,000 sh · -1.6% own

JOTHER—

Innovative Cellular… · 10% OwnerJul 27

38,500 sh · -1.4% own

SSELL◷$137

Innovative Cellular… · 10% OwnerJul 17

10 sh @ $13.70 · 0.0% own

SSELL◷$137

Innovative Cellular… · 10% OwnerJul 16

10 sh @ $13.73 · 0.0% own

JOTHER—

Innovative Cellular… · 10% OwnerJun 29

76,000 sh · -2.6% own

JOTHER—

Innovative Cellular… · 10% OwnerJun 15

66,500 sh · -2.2% own

SSELL$25K

Shook David · Chief Medical…Jun 10

1,977 sh @ $12.64 · -8.6% own

AGRANT◆—

Nabel Elizabeth G · DirectorJun 10

9,250 sh

AGRANT◆—

Ramachandra Sumant · DirectorJun 10

9,250 sh

AGRANT◆—

Rieflin William Jl · DirectorJun 10

9,250 sh

AGRANT◆—

Klausner Richard · DirectorJun 10

9,250 sh

AGRANT◆—

Friedman Cathy · DirectorJun 10

9,250 sh

AGRANT◆—

Bachleda Mark · DirectorJun 10

9,250 sh

AGRANT◆—

Brawley Otis W · DirectorJun 10

9,250 sh

SSELL$7.3K

Seely Lynn · President and CEOMay 11

388 sh @ $18.91 · -0.5% own

SSELL$2.5K

Lee Gary K. · Chief Scientific…May 11

130 sh @ $18.92 · -0.7% own

SSELL$1.7K

Hill Stephen J. · Chief Operating…May 11

89 sh @ $18.92 · -0.5% own

SSELL$4.1K

Bulis Veronica Sanchez · VP, Corporate…May 11

217 sh @ $18.91 · -1.4% own

AGRANT◆—

Shah Smital · Chief Fin. and…Mar 9

140,000 sh

PBUY★$12.5M

ARCH Venture Fund XIII,… · 10% OwnerMar 6

488,090 sh @ $25.61 · +52.0% own

PBUY★$12.5M

ARCH Venture Partners… · 10% OwnerMar 6

488,090 sh @ $25.61 · +52.0% own

SSELL$174.4K

Seely Lynn · President and CEOFeb 11

7,455 sh @ $23.39 · -9.1% own

SSELL$39.1K

Lee Gary K. · Chief Scientific…Feb 11

1,671 sh @ $23.39 · -9.0% own

SSELL$28.9K

Hill Stephen J. · Chief Operating…Feb 11

1,236 sh @ $23.39 · -6.5% own

AGRANT◆—

Shook David · Chief Medical…Feb 10

50,000 sh

AGRANT◆—

Meltz Mark A · General CounselFeb 10

50,000 sh

AGRANT◆—

Seely Lynn · President and CEOFeb 10

155,000 sh

SSELL$10.1K

Seely Lynn · President and CEOFeb 10

438 sh @ $23.12 · -0.5% own

AGRANT◆—

Lee Gary K. · Chief Scientific…Feb 10

50,000 sh

SSELL$3.4K

Lee Gary K. · Chief Scientific…Feb 10

147 sh @ $23.12 · -0.8% own

AGRANT◆—

Hill Stephen J. · Chief Operating…Feb 10

65,000 sh

SSELL$2.5K

Hill Stephen J. · Chief Operating…Feb 10

109 sh @ $23.12 · -0.6% own

SSELL$5.9K

Bulis Veronica Sanchez · VP, Corporate…Feb 10

254 sh @ $23.12 · -1.6% own

AGRANT—

Bulis Veronica Sanchez · VP, Corporate…Feb 10

8,750 sh · +122.5% own

AGRANT—

Seely Lynn · President and CEOFeb 9

20,000 sh · +32.2% own

AGRANT—

Lee Gary K. · Chief Scientific…Feb 9

4,000 sh · +27.1% own

AGRANT—

Hill Stephen J. · Chief Operating…Feb 9

4,000 sh · +26.4% own

SSELL$30.3K

Bulis Veronica Sanchez · VP, Corporate…Dec 30, 2025

936 sh @ $32.32 · -11.6% own

SSELL$43.9K

Bulis Veronica Sanchez · VP, Corporate…Dec 24, 2025

1,136 sh @ $38.67 · -12.3% own

SSELL$6.6K

Seely Lynn · President and CEONov 10, 2025

412 sh @ $16.11 · -0.6% own

SSELL$2.2K

Lee Gary K. · Chief Scientific…Nov 10, 2025

138 sh @ $16.16 · -0.9% own

SSELL$1.5K

Hill Stephen J. · Chief Operating…Nov 10, 2025

95 sh @ $16.12 · -0.6% own

SSELL$3.8K

Bulis Veronica Sanchez · VP, Corporate…Nov 10, 2025

239 sh @ $16.10 · -2.5% own

AGRANT◆—

Seely Lynn · President and CEOOct 27, 2025

175,000 sh

AGRANT◆—

Lee Gary K. · Chief Scientific…Oct 27, 2025

68,000 sh

AGRANT◆—

Hill Stephen J. · Chief Operating…Oct 27, 2025

75,000 sh

SSELL$76.5K

Seely Lynn · President and CEOAug 21, 2025

7,257 sh @ $10.54 · -9.7% own

SSELL$15.3K

Newton Charles W. · Chief Financial…Aug 21, 2025

1,453 sh @ $10.54 · -8.7% own

SSELL$15.3K

Lee Gary K. · Chief Scientific…Aug 21, 2025

1,453 sh @ $10.54 · -8.6% own

SSELL$10.6K

Hill Stephen J. · Chief Operating…Aug 21, 2025

1,004 sh @ $10.54 · -6.0% own

AGRANT—

Seely Lynn · President and CEOAug 20, 2025

40,000 sh · +114.9% own

AGRANT—

Newton Charles W. · Chief Financial…Aug 20, 2025

8,000 sh · +91.3% own

AGRANT—

Lee Gary K. · Chief Scientific…Aug 20, 2025

8,000 sh · +89.3% own

AGRANT—

Hill Stephen J. · Chief Operating…Aug 20, 2025

8,000 sh · +90.4% own

SSELL$4.2K

Seely Lynn · President and CEOAug 12, 2025

406 sh @ $10.34 · -1.1% own

SSELL$1.4K

Newton Charles W. · Chief Financial…Aug 12, 2025

136 sh @ $10.34 · -1.5% own

SSELL$1.4K

Lee Gary K. · Chief Scientific…Aug 12, 2025

136 sh @ $10.34 · -1.5% own

SSELL$972

Hill Stephen J. · Chief Operating…Aug 12, 2025

94 sh @ $10.34 · -1.1% own

SSELL$4.1K

Seely Lynn · President and CEOAug 11, 2025

391 sh @ $10.53 · -1.1% own

SSELL$1.4K

Newton Charles W. · Chief Financial…Aug 11, 2025

131 sh @ $10.53 · -1.5% own

SSELL$1.4K

Lee Gary K. · Chief Scientific…Aug 11, 2025

131 sh @ $10.53 · -1.4% own

SSELL$958

Hill Stephen J. · Chief Operating…Aug 11, 2025

91 sh @ $10.53 · -1.0% own

AGRANT◆—

Meltz Mark A · General CounselJun 9, 2025

100,000 sh

AGRANT◆—

Shook David · Chief Medical…Jun 9, 2025

43,750 sh

AGRANT—

Shook David · Chief Medical…Jun 9, 2025

21,900 sh

AGRANT◆—

Bachleda Mark · DirectorJun 9, 2025

13,000 sh

AGRANT◆—

Rieflin William Jl · DirectorMay 15, 2025

130,000 sh

AGRANT◆—

Nabel Elizabeth G · DirectorMay 15, 2025

130,000 sh

AGRANT◆—

Ramachandra Sumant · DirectorMay 15, 2025

130,000 sh

AGRANT◆—

Klausner Richard · DirectorMay 15, 2025

130,000 sh

AGRANT◆—

Friedman Cathy · DirectorMay 15, 2025

130,000 sh

AGRANT◆—

Brawley Otis W · DirectorMay 15, 2025

130,000 sh

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

6 of 62 filings we hold were filed after the two-business-day deadline. The furthest past the deadline was 21 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
May 11	Jun 14	Seely LynnPresident and CEO	21days	$7.3K	Filing ↗
May 11	Jun 14	Lee Gary K.Chief Scientific Officer	21days	$2.5K	Filing ↗
May 11	Jun 14	Bulis Veronica SanchezVP, Corporate Controller	21days	$4.1K	Filing ↗
May 11	Jun 14	Hill Stephen J.Chief Operating Officer	21days	$1.7K	Filing ↗
Dec 24, 2025	Jan 5	Bulis Veronica SanchezVP, Corporate Controller	4days	$43.9K	Filing ↗

Seely LynnPresident and CEO

21days

Traded May 11 · filed Jun 14Filing ↗

Lee Gary K.Chief Scientific Officer

21days

Traded May 11 · filed Jun 14Filing ↗

Bulis Veronica SanchezVP, Corporate Controller

21days

Traded May 11 · filed Jun 14Filing ↗

Hill Stephen J.Chief Operating Officer

21days

Traded May 11 · filed Jun 14Filing ↗

Bulis Veronica SanchezVP, Corporate Controller

4days

Traded Dec 24, 2025 · filed Jan 5Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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