Sonsini Peter W. (CIK 0001559807)

Latest company ownership

Shares held
82,978,668
Last filed at
Jan 28, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2017Q1 2025Q4
NEUE - NeueHealth, Inc.
Role: 10% Owner
Shares held
70,574,720
Last filed at
Oct 19, 2022
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q2 2025Q4
Shares held
10,714,285
Last filed at
Mar 18, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q1 2025Q4
SYBX - SYNLOGIC, INC.
Role: 10% Owner
Shares held
4,228,940
Last filed at
Jan 26, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2015Q4 2025Q4
Shares held
3,736,243
Last filed at
Jul 24, 2019
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q3 2025Q4
ARDX - ARDELYX, INC.
Role: 10% Owner
Shares held
3,082,186
Last filed at
May 30, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2016Q1 2025Q4
Shares held
3,000,000
Last filed at
Apr 13, 2022
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q2 2025Q4
APPN - APPIAN CORP
Role: 10% Owner
Shares held
2,724,202
Last filed at
Feb 15, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2017Q4 2025Q4
Shares held
2,611,050
Last filed at
Apr 7, 2022
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
Shares held
1,989,872
Last filed at
Apr 15, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q2 2025Q4
NKTX - Nkarta, Inc.
Role: 10% Owner
Shares held
1,712,810
Last filed at
Jul 16, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q3 2025Q4
Shares held
859,375
Last filed at
Mar 10, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
Shares held
669,002
Last filed at
Jun 30, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q2 2025Q4
Shares held
267,935
Last filed at
Nov 12, 2019
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q4 2025Q4
Shares held
745
Last filed at
Sep 16, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2017Q3 2025Q4
IONQ - IonQ, Inc.
Role: 10% Owner
Shares held
70
Last filed at
Nov 18, 2022
Confidence Score
50.0
2025Q4
Confidence Score History
2022Q2 2025Q4
ACLX - Arcellx, Inc.
Role: 10% Owner
Shares held
12
Last filed at
Dec 22, 2022
Confidence Score
50.0
2025Q4
Confidence Score History
2022Q1 2025Q4
Shares held
0
Last filed at
Feb 27, 2018
Confidence Score
50.0
2025Q4
Confidence Score History
2018Q1 2025Q4

Recent buy/sell transactions

Exec date Filing date Company Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Jun 21, 2022 Jun 23, 2022 Arcellx, Inc. 10% Owner Buy 93.8 +312,500 4.86% ✗ $5M
May 26, 2022 May 31, 2022 IonQ, Inc. 10% Owner Sell 15.0 -2,922,966 -10.00% ✗ $17.1M
Apr 11, 2022 Apr 13, 2022 Trevi Therapeutics, Inc. 10% Owner Buy 100.0 +3,580,526 45.96% ✗ $6.8M
Apr 5, 2022 Apr 7, 2022 Enliven Therapeutics, Inc. 10% Owner Sell 20.0 -694,551 -21.01% ✗ $751.3K
Feb 8, 2022 Feb 9, 2022 Arcellx, Inc. 10% Owner Buy 100.0 +1,583,333 32.65% ✗ $23.7M
Jan 21, 2022 Jan 25, 2022 Enliven Therapeutics, Inc. 10% Owner Sell 22.5 -134,558 -3.91% ✗ $202.2K
Jan 18, 2022 Jan 20, 2022 Enliven Therapeutics, Inc. 10% Owner Sell 36.3 -26,555 -0.77% ✗ $48.7K
Jan 12, 2022 Jan 14, 2022 Enliven Therapeutics, Inc. 10% Owner Sell 36.3 -21,550 -0.62% ✗ $41.8K
Jan 7, 2022 Jan 11, 2022 Enliven Therapeutics, Inc. 10% Owner Sell 36.3 -18,760 -0.53% ✗ $38.7K
Jan 4, 2022 Jan 6, 2022 Enliven Therapeutics, Inc. 10% Owner Sell 32.5 -31,916 -0.90% ✗ $72.2K
Dec 30, 2021 Jan 3, 2022 Enliven Therapeutics, Inc. 10% Owner Sell 20.0 -116,476 -3.19% ✗ $266.9K
Dec 27, 2021 Dec 29, 2021 Enliven Therapeutics, Inc. 10% Owner Sell 22.5 -67,427 -1.81% ✗ $159.5K
Dec 9, 2021 Dec 27, 2021 Enliven Therapeutics, Inc. 10% Owner Sell 20.0 -291,152 -7.25% ✗ $688.5K
Jun 28, 2021 Jun 30, 2021 NeueHealth, Inc. 10% Owner Buy 95.0 +1,944,444 2.78% ✗ $35M
Jun 28, 2021 Jun 30, 2021 Monte Rosa Therapeutics, Inc. 10% Owner Buy 100.0 +1,050,000 15.81% ✗ $20M
Apr 13, 2021 Apr 15, 2021 OnKure Therapeutics, Inc. 10% Owner Buy 100.0 +666,666 16.19% ✗ $10M
Mar 16, 2021 Mar 18, 2021 Marker Therapeutics, Inc. 10% Owner Buy 100.0 +5,714,285 114.29% ✗ $10M
Jul 14, 2020 Jul 16, 2020 Nkarta, Inc. 10% Owner Buy 100.0 +666,666 29.82% ✗ $12M
Apr 3, 2020 Apr 13, 2020 Trevi Therapeutics, Inc. 10% Owner Sell 52.5 -564 -0.01% ✗ $1.5K
Aug 28, 2019 Apr 13, 2020 Mersana Therapeutics, Inc. 10% Owner Sell 52.5 -1,211 -0.01% ✗ $3.5K
Mar 16, 2020 Mar 16, 2020 Enliven Therapeutics, Inc. 10% Owner Buy 100.0 +475,000 13.42% ✗ $7.6M
Mar 6, 2020 Mar 10, 2020 CHAMPIONS ONCOLOGY, INC. 10% Owner Sell 17.5 -708,155 -29.24% ✗ $5M
Jan 24, 2020 Jan 28, 2020 Adaptimmune Therapeutics PLC 10% Owner Buy 96.3 +7,500,000 7.90% ✗ $5M
Nov 12, 2019 Nov 12, 2019 Galera Therapeutics, Inc. 10% Owner Buy 100.0 +416,666 10.57% ✗ $5M
Jul 22, 2019 Jul 24, 2019 Mirum Pharmaceuticals, Inc. 10% Owner Buy 100.0 +450,000 12.04% ✗ $6.8M
May 9, 2019 May 13, 2019 Trevi Therapeutics, Inc. 10% Owner Buy 100.0 +2,500,000 128.96% ✗ $25M
Mar 5, 2019 Mar 6, 2019 Mersana Therapeutics, Inc. 10% Owner Buy 100.0 +3,750,000 46.07% ✗ $15M
Sep 7, 2018 Sep 10, 2018 Adaptimmune Therapeutics PLC 10% Owner Buy 100.0 +15,000,000 18.76% ✗ $25M
Mar 26, 2018 Mar 28, 2018 Adaptimmune Therapeutics PLC 10% Owner Buy 97.5 +6,571,164 8.95% ✗ $12.6M
Mar 21, 2018 Mar 23, 2018 Adaptimmune Therapeutics PLC 10% Owner Buy 87.5 +1,268,508 1.76% ✗ $2.4M
Feb 26, 2018 Feb 27, 2018 Oruka Therapeutics, Inc. 10% Owner Sell 20.0 -1,460,209 -100.00% ✗ $731.3K
Nov 27, 2017 Nov 27, 2017 APPIAN CORP 10% Owner Sell 15.0 -569,620 -100.00% ✗ $11.1M
Nov 20, 2017 Nov 21, 2017 APPIAN CORP 10% Owner Sell 15.0 -2,820,516 -100.00% ✗ $55M
Jul 3, 2017 Jul 6, 2017 Mersana Therapeutics, Inc. 10% Owner Buy 100.0 +1,000,000 14.01% ✗ $15M
Mar 27, 2017 Mar 28, 2017 Adaptimmune Therapeutics PLC 10% Owner Buy 100.0 +12,870,000 21.71% ✗ $9M
Jul 18, 2016 Jul 20, 2016 ARDELYX, INC. 10% Owner Buy 100.0 +1,527,301 40.15% ✗ $13.3M
Jan 13, 2016 Jan 14, 2016 ARDELYX, INC. 10% Owner Buy 100.0 +1,000,000 35.67% ✗ $10M
Oct 5, 2015 Oct 6, 2015 SYNLOGIC, INC. 10% Owner Buy 100.0 +1,146,308 21.08% ✗ $6M