LYEL Lyell Immunopharma, Inc.

NASDAQ
$11.33

Lyell Immunopharma, Inc. (LYEL) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal Bullish Insiders bought more than they sold over this window — uncommon at any size.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 6 sellers in the last 90 days
Insiders buying
1
2 transactions
Insiders selling
6
28 transactions
Purchases
$25.0M
976,180 shares
Sales
$604.6K
30,853 shares
Net activity
$24.4M
purchases less sales

How much of that selling was preplanned? 0% planned / 100% discretionary

10b5-1 plan sales $0 0 transactions · 0 shares
Discretionary sales $604.6K 28 transactions · 30,853 shares

Largest single sale: $174.4K.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: March 6, 2026 .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Shook David Chief Medical Officer Sell 500 $12.70 $6.4K 20,423 −2.4% of holding
Seely Lynn President and CEO Sell 9,589 $15.54 $149.0K 63,899 −13% of holding
Lee Gary K. Chief Scientific Officer Sell 1,457 $15.54 $22.6K 16,220 −8.2% of holding
Hill Stephen J. Chief Operating Officer Sell 989 $15.54 $15.4K 16,816 −5.6% of holding
Bulis Veronica Sanchez VP, Corporate Controller Sell 621 $14.34 $8.9K 14,799 −4% of holding
Seely Lynn President and CEO Sell 390 $14.34 $5.6K 73,488 −0.5% of holding
Lee Gary K. Chief Scientific Officer Sell 131 $14.34 $1.9K 17,677 −0.7% of holding
Hill Stephen J. Chief Operating Officer Sell 89 $14.34 $1.3K 17,805 −0.5% of holding
Innovative Cellular Therapeutics Holdings Ltd 10% Owner Sell 10 $13.70 $137 2,857,480 −0% of holding
Innovative Cellular Therapeutics Holdings Ltd 10% Owner Sell 10 $13.73 $137 2,857,490 −0% of holding
Shook David Chief Medical Officer Sell 1,977 $12.64 $25.0K 20,923 −8.6% of holding
Seely Lynn President and CEO Sell 388 $18.91 $7.3K 73,878 −0.5% of holding
Bulis Veronica Sanchez VP, Corporate Controller Sell 217 $18.91 $4.1K 15,420 −1.4% of holding
Lee Gary K. Chief Scientific Officer Sell 130 $18.92 $2.5K 17,808 −0.7% of holding
Hill Stephen J. Chief Operating Officer Sell 89 $18.92 $1.7K 17,894 −0.5% of holding
2 fills Buy 976,180 $25.61 $25.0M 1,426,528
Seely Lynn President and CEO Sell 7,455 $23.39 $174.4K 74,266 −9.1% of holding
Lee Gary K. Chief Scientific Officer Sell 1,671 $23.39 $39.1K 16,938 −9% of holding
Hill Stephen J. Chief Operating Officer Sell 1,236 $23.39 $28.9K 17,795 −6.5% of holding
Seely Lynn President and CEO Sell 438 $23.12 $10.1K 81,721 −0.5% of holding
Bulis Veronica Sanchez VP, Corporate Controller Sell 254 $23.12 $5.9K 15,637 −1.6% of holding
Lee Gary K. Chief Scientific Officer Sell 147 $23.12 $3.4K 18,609 −0.8% of holding
Hill Stephen J. Chief Operating Officer Sell 109 $23.12 $2.5K 19,031 −0.6% of holding
Bulis Veronica Sanchez VP, Corporate Controller Sell 936 $32.32 $30.3K 7,141 −11.6% of holding
Bulis Veronica Sanchez VP, Corporate Controller Sell 1,136 $38.67 $43.9K 8,077 −12.3% of holding
Seely Lynn President and CEO Sell 412 $16.11 $6.6K 67,159 −0.6% of holding
Bulis Veronica Sanchez VP, Corporate Controller Sell 239 $16.10 $3.8K 9,213 −2.5% of holding
Lee Gary K. Chief Scientific Officer Sell 138 $16.16 $2.2K 15,366 −0.9% of holding
Hill Stephen J. Chief Operating Officer Sell 95 $16.12 $1.5K 15,750 −0.6% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.