InsidersTradesSigma
Total declarations
Companies
▲ Purchases (0 ops.)
▼ Sales (2 ops.)
Insider track record
OtherDisclosed buys
0
Disclosed sells
2
T+90 hit rate
50%
T+90 mean return
+2.1%
Across 4 buy signals with a settled T+90 return. Return basis: close on the day after publication.
Signal history
Explore the detailed record of transactions filed by CHANG DAVID C. Officer active across 2 companies, notably AXT INC. Aggregated, 9 reports have been published. Split: 0 buy · 2 sells. Total volume traded: €497k. Activity tracked since 20 May 2021. The latest transaction was disclosed on 28 November 2025 (Cession). Regulator: SEC (Form 4). All data is openly available.
Declarations9 total
25,000 shares@ US$10.7246.5% of flowCommon StockSEC:0001437749-25-036693:0
25,000 shares@ US$12.3353.5% of flowCommon StockSEC:0001437749-25-036693:1
55,172 sharesCommon StockSEC:0001415889-25-013458:0
23,323 shares0Common StockSEC:0001415889-24-013689:0
23,323 shares0Common StockSEC:0001415889-23-008432:0
15,238 shares0Common StockSEC:0001415889-22-005475:0
6,726 shares0Common StockSEC:0001179110-21-005828
6,726 shares0Common StockSEC:0001179110-21-005828:0
603 sharesCommon Stock, par value $.01 per shareSEC:0001225208-16-024010:0
9 of 9 declarations
