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Who

David B. Singer

Director

Company insider

Files Form 4 as: Director, Infleqtion; Director, Castlight Health; Director, 1Life Healthcare; Director and 10% owner, Seer; Director, Pacific Biosciences of California; Director, Corcept Therapeutics; Director, Affymetrix; Director and Other, Oscient Pharmaceuticals.

Every Form 4 they filed

In numbers

Trades disclosed
189
Buys
0
Sells
16
Bought
$0
Sold
$516.7M
Companies
8
Companies where not an officer
8
First trade
16 Nov 2005
Last trade
29 May 2026
Last filed
29 May 2026

Companies traded

Everywhere else they filed: board seats, 10% stakes, other companies
INFQ InfleqtionDirector · Payments & Processors · last 29 May 20260 buys · 4 sells
Castlight HealthDirector · last 17 Feb 20220 buys · 0 sells
1Life HealthcareDirector · last 15 Jul 20210 buys · 0 sells
SEER SeerDirector, 10% owner · Life-science tools · last 17 Jun 20210 buys · 0 sells
PACB Pacific Biosciences of CaliforniaDirector · Life-science tools · last 13 Jun 20120 buys · 0 sells
CORT Corcept TherapeuticsDirector · Pharmaceuticals · last 19 Dec 20070 buys · 0 sells
AffymetrixDirector · last 13 Jun 20070 buys · 0 sells
Oscient PharmaceuticalsDirector, Other · last 8 Jun 20060 buys · 12 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
40Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—1,386,029 at $0.00filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—321,623 at $0.00filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—660,901 at $0.00filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—350,115 at $0.00filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$2.7M169,411 at $16.05filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$123K7,277 at $16.85filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$24K1,353 at $17.91filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—810,384 at $0.00filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$24.7M1,541,092 at $16.05filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$1.1M66,194 at $16.85filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$220K12,310 at $17.91filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—1,386,029 at $0.00filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$2.7M169,411 at $16.05filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$123K7,277 at $16.85filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$24K1,353 at $17.91filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—810,384 at $0.00filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$24.7M1,541,092 at $16.05filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$1.1M66,194 at $16.85filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Sold$220K12,310 at $17.91filing
29 May 2026filed 29 May 2026INFQ InfleqtionPayments & ProcessorsSEC FORM 4 Code J—311,208 at $0.00filing

News

Infleqtion seeks local incentives for Louisville expansion – BizWestINFQ · bizwest.com · 19 Oct 2026Infleqtion UK to Develop Deployable Quantum Radio Frequency Direction Finding SystemINFQ · finanznachrichten.de · 13 Oct 2026

0 headlines in the last 90 days name David B. Singer; 2 articles from the last 14 days about the 1 company they traded most, at most three about any one of them.

Sectors

Financials4
Not placed12

Buys in green, sells in red, by the company’s sector.

Related people

MAVERICK CAPITAL LTDDirector · Director at Infleqtion, filing Form 4 there in the last year
Pranav GokhaleChief Technology Officer · Chief Technology Officer at Infleqtion, filing Form 4 there in the last year
Kristina M. JohnsonDirector · Director at Infleqtion, filing Form 4 there in the last year
Paul LipmanChief Revenue Officer · Chief Revenue Officer at Infleqtion, filing Form 4 there in the last year
Matthew John KinsellaChief Executive Officer · Chief Executive Officer at Infleqtion, filing Form 4 there in the last year