InsidersTradesSigma
Total declarations
Companies
▲ Purchases (2 ops.)
▼ Sales (0 ops.)
Insider track record
CEODisclosed buys
2
Disclosed sells
0
T+90 hit rate
22%
T+90 mean return
-9.2%
Across 9 buy signals with a settled T+90 return. Return basis: close on the day after publication.
Signal history
Browse the full record of transactions filed by SOUTHWELL DAVID P, Chief Executive Officer. Insider active across 3 companies, notably TScan Therapeutics, Inc.. Cumulatively, 16 filings have been recorded. Split: 2 buys · 0 sell. Total volume traded: €133k. Activity tracked since 8 September 2021. The latest transaction was filed on 18 June 2026 (Attribution). Regulator: SEC (Form 4). The full history is openly available.
Declarations16 total
22,862 shares0Common StockSEC:0001140361-26-027677:0
12,000 shares@ US$30.86Common StockSEC:0001415889-25-024280:0
30,000 shares0Common StockSEC:0001140361-25-026404:0
4,000 shares0Common StockSEC:0001415889-25-001027:0
113,124 shares0Common StockSEC:0001140361-24-026884:0
1,650 shares0Common StockSEC:0001415889-24-012891:0
70,000 shares@ US$4.342100.0% of flowCommon StockSEC:0001140361-24-020127:0
4,000 shares0Common StockSEC:0001415889-24-004121:0
11,429 shares@ US$18.0139.2% of flowCommon StockSEC:0001415889-23-006696:0
2,571 shares@ US$18.018.8% of flowCommon StockSEC:0001415889-23-005991:0
10,000 shares@ US$27.0552.0% of flowCommon StockSEC:0001415889-23-005565:0
4,000 shares0Common StockSEC:0001415889-23-000669:0
15,000 shares@ US$3.62260.079% mcap13.5% of flowVoting Common StockSEC:0000899243-22-019018:0
Ideal exit: 12 Feb 2023 (T+270)
3,200 shares0Common StockSEC:0001179110-22-000384:0
48,670 shares@ US$1.970.13% mcap22.1% of flowVoting Common StockSEC:0000899243-21-049764:0
11,000 shares@ US$8.73330.12% mcap21.2% of flowVoting Common StockSEC:0000899243-21-035442:0
Ideal exit: 5 Jun 2022 (T+270)
16 of 16 declarations
About SOUTHWELL DAVID P
David P. Southwell is the Chief Executive Officer and Board Member at TScan Therapeutics, Inc. and PTC Therapeutics, Inc. He is responsible for the strategic direction of these companies and managing daily operations. His role involves working closely with the board of directors to define the company's objectives and ensure its growth. Through his leadership, he contributes to the success of TScan and PTC.
