InsidersTradesSigma
Total declarations
Companies
▲ Purchases (2 ops.)
▼ Sales (0 ops.)
Insider track record
CEODisclosed buys
2
Disclosed sells
0
T+90 hit rate
0%
T+90 mean return
-3.7%
Across 2 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, 18 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 3 August 2026 (J). Regulator: SEC (Form 4). The full history is openly available.
Companies and markets linked to Southwell David P
Open company profiles for insider transactions, fundamentals and analyst consensus when available.
Declarations18 total
150,000 shares0Common StockSEC:0001140361-26-031471:0
22,862 shares0Common StockSEC:0001140361-26-027677:0
4,000 shares0Common StockSEC:0001251553-26-000002:0
12,000 shares@ US$30.8639.7% of flowCommon 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$3.622623.8% of flowVoting Common StockSEC:0000899243-22-019018:0
Canonical exit: 16 Aug 2022 (T+90)
3,200 shares0Common StockSEC:0001179110-22-000384:0
48,670 shares@ US$1.9738.9% of flowVoting Common StockSEC:0000899243-21-049764:0
11,000 shares@ US$8.733337.3% of flowVoting Common StockSEC:0000899243-21-035442:0
Canonical exit: 7 Dec 2021 (T+90)
18 of 18 declarations
About Southwell David P
David P. Southwell is Chief Executive Officer and a declarant linked to PTC Therapeutics, INC., Rocket Pharmaceuticals, INC. and TScan Therapeutics, Inc., where he is also a Director at the first two companies and Chief Executive Officer at TScan Therapeutics, Inc. He has made 17 filings in total, and across the recent sample of 17 filings, buys total EUR 133167 and sells total EUR 0, between 2021-09-09 and 2026-07-06. The recent top filings include EUR 316438.4512789986 at PTC Therapeutics, INC. on 2025-09-11, EUR 283345.0316664139 at Rocket Pharmaceuticals, INC. on 2024-04-16, and EUR 250299.0651834529 at PTC Therapeutics, INC. on 2023-03-29.
