- Corporate Officers - R
- Ridloff Elena
Insider Trading History of Ridloff Elena
The following table details the insider trading activities
(stock purchases, stock sales, and stock option exercises) of Ridloff Elena since 2019.
This trader's CIK number is 1772518.
At the time of last reporting, Ridloff Elena was the CFO & Head of Corp. Dev. of Sionna Therapeutics, Inc.. (stock ticker symbol SION).
Also see all insider trading activities at Sionna Therapeutics, Inc..
Note that in the past
Ridloff Elena also reported insider trading activities as an insider of the following companies:
Yearly summary of insider trading at Kronos Bio, Inc. (KRON) by Ridloff Elena
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2020 | KRON | 2,630 | $49,970 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Sionna Therapeutics, Inc. (SION) by Ridloff Elena
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2025 | SION | 0 | $0 | 85,000 | $1,966,631 | 0 | $0 |
Yearly summary of insider trading at Kymera Therapeutics, Inc. (KYMR) by Ridloff Elena
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2025 | KYMR | 0 | $0 | 16,500 | $780,000 | 16,500 | $423,345 |
Yearly summary of insider trading at Acadia Pharmaceuticals Inc (ACAD) by Ridloff Elena
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2021 | ACAD | 0 | $0 | 3,067 | $157,994 | 2,722 | $0 |
| 2020 | ACAD | 0 | $0 | 11,050 | $559,031 | 13,245 | $166,357 |
| 2019 | ACAD | 0 | $0 | 36,000 | $1,793,952 | 36,000 | $569,160 |
Insider trading activities at 4 companies by Ridloff Elena:
1. Kronos Bio, Inc. (KRON)
2. Sionna Therapeutics, Inc. (SION)
3. Kymera Therapeutics, Inc. (KYMR)
4. Acadia Pharmaceuticals Inc (ACAD)
Table 1. Insider trading of Kronos Bio, Inc. (KRON) by Ridloff Elena
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2020-10-14 | KRON | Buy | 2,630 | 19.00 | 49,970 |
Table 2. Insider trading of Sionna Therapeutics, Inc. (SION) by Ridloff Elena
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2025-08-29 | SION | Sale | 748 | 25.18 | 18,834 |
| 2025-09-02 | SION | Sale | 8,836 | 25.08 | 221,606 |
| 2025-08-26 | SION | Sale | 3,700 | 25.13 | 92,981 |
| 2025-08-27 | SION | Sale | 3,618 | 25.10 | 90,811 |
| 2025-08-28 | SION | Sale | 16,098 | 25.97 | 418,065 |
| 2025-08-20 | SION | Sale | 17,500 | 22.69 | 397,075 |
| 2025-08-19 | SION | Sale | 34,500 | 21.08 | 727,259 |
Table 3. Insider trading of Kymera Therapeutics, Inc. (KYMR) by Ridloff Elena
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2025-06-11 | KYMR | Option Ex | 4,500 | 20.29 | 91,305 |
| 2025-06-11 | KYMR | Sale | 4,500 | 50.00 | 225,000 |
| 2025-06-03 | KYMR | Option Ex | 12,000 | 27.67 | 332,040 |
| 2025-06-03 | KYMR | Sale | 12,000 | 46.25 | 555,000 |
Table 4. Insider trading of Acadia Pharmaceuticals Inc (ACAD) by Ridloff Elena
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2021-02-04 | ACAD | Sale | 2,051 | 50.61 | 103,801 |
| 2021-01-06 | ACAD | Sale | 1,016 | 53.34 | 54,193 |
| 2021-01-06 | ACAD | Option Ex | 2,722 | .00 | 0 |
| 2020-04-29 | ACAD | Option Ex | 13,245 | 12.56 | 166,357 |
| 2020-04-30 | ACAD | Sale | 1,050 | 49.22 | 51,681 |
| 2020-04-29 | ACAD | Sale | 10,000 | 50.73 | 507,350 |
| 2019-12-09 | ACAD | Sale | 36,000 | 49.83 | 1,793,952 |
| 2019-12-09 | ACAD | Option Ex | 36,000 | 15.81 | 569,160 |
Insider trading activities including stock purchases, stock sales, and option exercises
listed in the above table cannot be completely guaranteed as to their accuracy.
For more information regarding the trades made by Ridloff Elena
(CFO & Head of Corp. Dev. of Sionna Therapeutics, Inc. at the time of this reporting) see
the Securities and Exchange Commission (SEC) website.