Tempest Therapeutics, Inc. (TPST) has 20 known insider and institutional holders on record. The largest holder is Westphal Christoph H with 3,820,571 shares. Other notable holders include Versant Vantage II, L.P. and Makhzoumi Mohamad.
Over the last 12 months, insiders have made 9 transactions in TPST stock — 8 buys (valued at $1.42M) and 0 sells (valued at RSU Award). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
TPST Insider Ownership
Top Holder
Westphal Christoph H
3,820,571 shares
Buys (12 mo)
8
$1.42M value
Sells (12 mo)
0
$0.00 value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Westphal Christoph H |
10 Percent Owner |
3,820,571 |
2014-03-11 |
|
| 2 |
Versant Vantage Ii, L.p. |
10 Percent Owner |
2,118,644 |
2022-05-03 |
|
| 3 |
Makhzoumi Mohamad |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 4 |
Barris Peter J |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 5 |
New Enterprise Associates 15, L.p. |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 6 |
Makower Joshua |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 7 |
Baskett Forest |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 8 |
Sonsini Peter W. |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 9 |
Florence Anthony A. Jr. |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 10 |
Mott David M |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 11 |
Sandell Scott D |
10 Percent Owner |
1,766,407 |
2018-12-11 |
|
| 12 |
Fhm Vi, L.l.c. |
10 Percent Owner |
1,396,615 |
2018-12-11 |
|
| 13 |
Versant Venture Capital Vi, L.p. |
10 Percent Owner |
597,940 |
2024-08-12 |
|
| 14 |
Brady Stephen R |
President and CEO |
550,000 |
2025-01-06 |
|
| 15 |
Arcudi Iii Louis J |
President and CEO |
400,000 |
2021-03-02 |
|
| 16 |
Lawton Alison Francis |
Chief Operating Officer |
368,892 |
2013-03-11 |
|
| 17 |
Longwood Fund, L.p. |
10 Percent Owner |
319,082 |
2015-01-16 |
|
| 18 |
Whiting Samuel |
Chief Medical Officer |
270,000 |
2025-01-06 |
|
| 19 |
Stock Harald F. |
Director |
250,000 |
2016-01-07 |
|
| 20 |
Angel Matthew |
10 Percent Owner, Officer: CEO and President |
231,482 |
2026-03-25 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-31 |
Trojanowski Justin |
Corporate Controller |
RSU Award |
22,000 |
$1.64 |
$36.08K |
| 2026-03-31 |
Maestas Nicholas |
Chief Financial Officer |
RSU Award |
140,000 |
$1.64 |
$229.6K |
| 2026-03-24 |
Angel Matthew |
10 Percent Owner, Officer: CEO and President |
Informative Buy |
231,482 |
$2.16 |
$500K |
| 2026-02-04 |
Angel Matthew |
10 Percent Owner, Officer: CEO and President |
RSU Award |
269,621 |
$2.38 |
$641.7K |
| 2026-02-03 |
Angel Matthew |
10 Percent Owner, Officer: CEO and President |
Unknown |
- |
- |
- |
| 2026-01-27 |
Simantov Ronit |
Director |
RSU Award |
1,230 |
$2.94 |
$3.62K |
| 2026-01-27 |
Raab Michael |
Director |
RSU Award |
1,230 |
$2.94 |
$3.62K |
| 2026-01-27 |
Nichol Geoffrey |
Director |
RSU Award |
1,230 |
$2.94 |
$3.62K |
| 2026-01-27 |
Pellizzari Christine A |
Director |
RSU Award |
1,230 |
$2.94 |
$3.62K |
