Lee S Ainslie III
CIK 1286654 · last filed 2026-04-14
Lee S Ainslie III is a corporate insider who has filed 14 SEC Form 4 insider transactions across 5 companies since 2008. The most recent filing, for INFQ.WS, was dated Apr 14, 2026. Across all open-market trades the lifetime net is +$38.8M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $24.7K across reported positions. 43 SEC filings were submitted jointly with MAVERICK CAPITAL LTD.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
CSLT price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
20TH FLOOR
DALLAS, TX 75201
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| INFQ.WS | Director | — | $3.62 | — | $0 | 1 | 2026-04-14 |
| SEER | Director | 12,190 | $2.03 | $24.7K | $1.77M | 3 | 2021-06-23 |
| CASTLIGHT HEALTH, INC. (CSLT) Delisted | 10%+ Owner | 1,739,167 | $2.05 | $3.57M | $34.80M | 7 | 2017-07-14 |
| BFLY | 10%+ Owner | — | $7.25 | — | $0 | 1 | 2008-07-25 |
| Under Armour, Inc. (UARM) Delisted | 10%+ Owner | 3,779,420 | — | — | $2.19M | 1 | 2008-01-23 |
Recent Filings
14 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-04-14 | INFQ.WS | Grant (A) | — | $0 | EDGAR |
| 2021-06-23 | SEER | Grant (A) | — | $0 | EDGAR |
| 2020-12-31 | SEER | Buy (P) | +93,380 | $1.77M | EDGAR |
| 2020-12-10 | SEER | Conv (C) | +21,302,052 | $0 | EDGAR |
| 2017-07-14 | CASTLIGHT HEALTH, INC. (CSLT) Delisted | Conv (C) | +2,069,432 | $0 | EDGAR |
| 2017-06-26 | CASTLIGHT HEALTH, INC. (CSLT) Delisted | Grant (A) | +134,940 | $0 | EDGAR |
| 2016-07-08 | CASTLIGHT HEALTH, INC. (CSLT) Delisted | Grant (A) | +125,000 | $0 | EDGAR |
| 2015-06-19 | CASTLIGHT HEALTH, INC. (CSLT) Delisted | Grant (A) | +50,000 | $0 | EDGAR |
| 2014-09-02 | CASTLIGHT HEALTH, INC. (CSLT) Delisted | Buy (P) | +749,658 | $8.56M | EDGAR |
| 2014-08-29 | CASTLIGHT HEALTH, INC. (CSLT) Delisted | Buy (P) | +420,135 | $4.63M | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.