Acadian Asset Management Inc. (AAMI) · Insider trading
What Acadian Asset Management's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$0
0 insiders, 0 trades
Sold, 12 months
$157.68M
5 insiders, 0% under a plan
Net, 12 months
−$157.68M
bought less sold
Latest filing
2026-08-05
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Paulson & Co. Inc.10% owner | – | $204.33M | 2 | 2026-06-17 | – |
| Hart Richard JonathanCLO and CAO | – | $8.69M | 3 | 2026-05-04 | 85,071 |
| Wiater ChristinaPAO | – | $2.24M | 4 | 2026-08-04 | 0 |
| Chersi Robert JDirector | – | $1.48M | 1 | 2026-02-11 | – |
| Trebbi BarbaraDirector | – | $496,373 | 1 | 2026-02-10 | 35,771 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-04 | Wiater ChristinaPAO | Sale | 244 | 92.36 | $22,536 | 0 | Form 4 |
| 2026-08-03 | Wiater ChristinaPAO | Sale | 7,978 | 86.61 | $690,975 | 17,636 | Form 4 |
| 2026-08-03 | Wiater ChristinaPAO | Sale | 17,389 | 87.49 | $1.52M | 247 | Form 4 |
| 2026-08-03 | Wiater ChristinaPAO | Sale | 3 | 88.11 | $264 | 244 | Form 4 |
| 2026-06-17 | Paulson & Co. Inc.10% owner | Saleindirect | 1,900,000 | 77.25 | $146.78M | 5,843,282 | Form 4 |
| 2026-05-04 | Hart Richard JonathanCLO and CAO | Sale | 88,792 | 66.87 | $5.94M | 85,071 | Form 4 |
| 2026-05-04 | Hart Richard JonathanCLO and CAO | Sale | 11,208 | 67.73 | $759,118 | 73,863 | Form 4 |
| 2026-02-11 | Chersi Robert JDirector | Saleindirect | 28,753 | 51.30 | $1.48M | 37,384 | Form 4 |
| 2026-02-10 | Trebbi BarbaraDirector | Sale | 9,691 | 51.22 | $496,373 | 35,771 | Form 4 |
| 2025-09-03 | Paulson & Co. Inc.10% owner | Saleindirect | 1,206,839 | 47.69 | $57.55M | 7,743,282 | Form 4 |
| 2024-11-11 | Hart Richard JonathanChief Legal Officer | Sale | 70,000 | 28.52 | $2.00M | 155,778 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
14 × option exercise8 × shares withheld for tax4 × gift
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-06-15 | Trebbi BarbaraDirector | Gift G | −10,260 | – | 28,797 | Form 4 |
| 2026-06-15 | Trebbi BarbaraDirector | Gift G | +10,260 | – | 10,260 | Form 4 |
| 2026-05-14 | Trebbi BarbaraDirector | Option exercise M | +3,286 | – | 39,057 | Form 4 |
| 2026-05-14 | Chersi Robert JDirector | Option exercise M | +3,286 | – | 3,286 | Form 4 |
| 2026-05-14 | Paulson JohnDirector, 10% owner | Option exercise M | +5,750 | – | 29,510 | Form 4 |
| 2026-02-15 | Hart Richard JonathanCLO and CAO | Option exercise M | +9,550 | – | 178,481 | Form 4 |
| 2026-02-15 | Hart Richard JonathanCLO and CAO | Shares withheld for tax F | −4,618 | 51.85 | 173,863 | Form 4 |
| 2026-02-15 | Wiater ChristinaPFO / PAO | Option exercise M | +5,180 | – | 27,135 | Form 4 |
| 2026-02-15 | Wiater ChristinaPFO / PAO | Shares withheld for tax F | −1,521 | 51.85 | 25,614 | Form 4 |
| 2026-02-14 | Hart Richard JonathanCLO and CAO | Option exercise M | +5,755 | – | 171,713 | Form 4 |
| 2026-02-14 | Hart Richard JonathanCLO and CAO | Shares withheld for tax F | −2,782 | 51.85 | 168,931 | Form 4 |
| 2026-02-14 | Wiater ChristinaPFO / PAO | Option exercise M | +4,006 | – | 23,131 | Form 4 |
| 2026-02-14 | Wiater ChristinaPFO / PAO | Shares withheld for tax F | −1,176 | 51.85 | 21,955 | Form 4 |
| 2025-06-10 | Chersi Robert JDirector | Gift G | −27,986 | – | 0 | Form 4 |
| 2025-06-10 | Chersi Robert JDirector | Gift G | +27,986 | – | 66,137 | Form 4 |
| 2025-05-13 | Chersi Robert JDirector | Option exercise M | +4,437 | – | 27,986 | Form 4 |
| 2025-05-13 | Trebbi BarbaraDirector | Option exercise M | +4,437 | – | 45,462 | Form 4 |
| 2025-05-13 | Paulson JohnDirector, 10% owner | Option exercise M | +7,764 | – | 23,760 | Form 4 |
| 2025-02-15 | Hart Richard JonathanCLO and CAO | Option exercise M | +16,124 | – | 171,902 | Form 4 |
| 2025-02-15 | Hart Richard JonathanCLO and CAO | Shares withheld for tax F | −5,944 | 25.69 | 165,958 | Form 4 |
| 2025-02-15 | Wiater ChristinaPFO / PAO | Option exercise M | +5,180 | – | 20,646 | Form 4 |
| 2025-02-15 | Wiater ChristinaPFO / PAO | Shares withheld for tax F | −1,521 | 25.69 | 19,125 | Form 4 |
| 2024-11-11 | Hart Richard JonathanChief Legal Officer | Option exercise M | +90,000 | 12.00 | 160,009 | Form 4 |
| 2024-11-11 | Hart Richard JonathanChief Legal Officer | Shares withheld for tax F | −62,585 | 29.25 | 97,424 | Form 4 |
| 2024-11-11 | Hart Richard JonathanChief Legal Officer | Option exercise M | +375,000 | 10.00 | 472,424 | Form 4 |
| 2024-11-11 | Hart Richard JonathanChief Legal Officer | Shares withheld for tax F | −246,646 | 29.25 | 225,778 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.