Quick Takeaways
- Third Harmonic Bio, Inc. has 20 insiders with reported activity on this page.
- No net insider buy/sell flow is currently reported for the last year.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 20 Insiders of Third Harmonic Bio, Inc.
- Location
- San Francisco, CA
What Changed
- No meaningful buy/sell imbalance is currently visible in the one-year window.
- Activity will update as new Forms 3/4/5 are filed.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsInsider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 15 May 2025.
Buys
$0
Shares: 0
Insiders: 0
Sells
$0
Shares: 0
Insiders: 0
Net
$0
Shares: 0
Insiders: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Third Harmonic Bio, Inc. executives and other stock owners filed with the SEC include:
Top shareholders of Third Harmonic Bio, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Atlas Venture Fund XI, L.P. |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
9,798,075
|
$140,112,473 | — | 01 Nov 2024 | |
| ORBIMED ADVISORS LLC |
3/4/5
|
Director, 10%+ Owner |
—
class O/S missing
|
5,779,071
|
$59,522,120 | — | 19 Sep 2022 | |
| BML Investment Partners, L.P. |
13D/G
|
— |
8.2%
|
3,724,167
|
$19,179,460 | $0 | 11 Feb 2025 | |
| BVF PARTNERS L P/IL |
3/4/5
|
Other* |
—
class O/S missing
|
176,692
|
$2,526,696 | — | 29 Oct 2024 | |
| Natalie C. Holles |
3/4/5
|
CEO, Director |
—
mixed-class rows
|
400,000
mixed-class rows
|
$750,000 | — | 11 Aug 2025 | |
| Christopher M. Murphy |
3/4/5
|
Chief Financial & Bus. Officer |
—
mixed-class rows
|
140,000
mixed-class rows
|
$450,000 | — | 11 Aug 2025 | |
| Edward R. Conner |
3/4/5
|
Chief Medical Officer |
—
mixed-class rows
|
517,418
mixed-class rows
|
$247,500 | — | 15 Jan 2025 | |
| Christopher Dinsmore |
3/4/5
|
Chief Scientific Officer |
—
mixed-class rows
|
427,500
mixed-class rows
|
$217,500 | — | 15 Jan 2025 | |
| Julie Person |
3/4/5
|
CHIEF ADMINISTRATIVE OFFICER |
—
mixed-class rows
|
268,462
mixed-class rows
|
$187,500 | — | 15 Jan 2025 | |
| Dennis Dean |
3/4/5
|
Chief Nonclinical Dev. Officer |
—
mixed-class rows
|
313,500
mixed-class rows
|
$172,500 | — | 15 Jan 2025 | |
| Jennifer Dittman |
3/4/5
|
Chief Operating Officer |
—
mixed-class rows
|
119,794
mixed-class rows
|
$172,500 | — | 15 Jan 2025 | |
| RHUMBLINE ADVISERS |
13F
|
Company |
0.04%
|
20,267
|
$109,032 | — | 31 Dec 2025 | |
| FMR LLC |
13D/G
|
— |
0%
|
1,066
|
$5,490 | -$13,057,691 | 31 Mar 2025 | |
| GAMMA Investing LLC |
13F
|
Company |
0%
|
458
|
$2,464 | — | 31 Dec 2025 | |
| HUNTINGTON NATIONAL BANK |
13F
|
Company |
—
class O/S missing
|
1
|
$41 | — | 31 Dec 2025 | |
| SBI Securities Co., Ltd. |
13F
|
Company |
0%
|
20
|
$1 | — | 31 Dec 2025 | |
| Robert Ho |
3/4/5
|
Chief Financial Officer |
—
class O/S missing
|
136,000
|
— | — | 06 Mar 2023 | |
| Adrian S. Ray |
3/4/5
|
Chief Scientific Officer |
—
class O/S missing
|
132,000
|
— | — | 06 Mar 2023 | |
| Geoff Mcdonough |
3/4/5
|
Director |
—
class O/S missing
|
60,000
|
— | — | 27 Mar 2024 | |
| Robert J. Perez |
3/4/5
|
Director |
—
class O/S missing
|
13,667
|
— | — | 06 Mar 2023 | |
| Shao-Lee Lin |
3/4/5
|
Director |
—
class O/S missing
|
13,667
|
— | — | 26 Oct 2022 |
Recent Insider Transactions by Companies or Individuals for Third Harmonic Bio, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Natalie C. Holles | THRD | Common Stock | Other | -100% | -1,218,836 | 0 | 11 Aug 2025 | Direct | ||
| Natalie C. Holles | THRD | Restricted Stock Unit | Other | -100% | -50,000 | 0 | 11 Aug 2025 | Direct | ||
| Natalie C. Holles | THRD | Stock Option | Other | -100% | -998,854 | 0 | 11 Aug 2025 | Direct | ||
| Michael Gladstone | THRD | Stock Option | Other | -100% | -43,584 | 0 | 11 Aug 2025 | Direct | ||
| Christopher M. Murphy | THRD | Restricted Stock Unit | Other | -100% | -47,500 | 0 | 11 Aug 2025 | Direct | ||
| Iwicki Mark T. | THRD | Common Stock | Other | -100% | -128,631 | 0 | 11 Aug 2025 | Direct | ||
| Iwicki Mark T. | THRD | Stock Option | Other | -100% | -83,296 | 0 | 11 Aug 2025 | Direct | ||
| Hans Martin Seidel | THRD | Common Stock | Other | -100% | -85,753 | 0 | 11 Aug 2025 | Direct | ||
| Hans Martin Seidel | THRD | Stock Option | Other | -100% | -53,090 | 0 | 11 Aug 2025 | Direct | ||
| Thomas P. Soloway | THRD | Stock Option | Other | -100% | -120,166 | 0 | 11 Aug 2025 | Direct | ||
| David P. Bonita | THRD | Common Stock | Other | -100% | -5,779,071 | 0 | 11 Aug 2025 | Direct | ||
| David P. Bonita | THRD | Stock Option | Other | -100% | -43,584 | 0 | 11 Aug 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.