A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 6 filings in this group are Form 4s for ProQR Therapeutics N.V.
The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.
Across the 6 insider filings shown, the breakdown is 5 open-market purchase and 1 compensation award. 5 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.
Form 4
Open-market purchase
Insider Buying
2026-08-03
PRQR insider de Boer Daniel Anton (Director, Chief Executive Officer) bought 200,000 shares (~$354.0K)
de Boer Daniel Anton, listed as Director, Chief Executive Officer at ProQR Therapeutics N.V., reported an open-market purchase of 200,000 PRQR shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.
The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
P |
Open-market purchase
|
200,000 |
$1.77 |
$354.0K |
Filing: Form 4 (Insider Transaction)
Insider: de Boer Daniel Anton (Director, Chief Executive Officer)
Shares: 200,000
Est. Value: $354.0K
Form 4
Open-market purchase
Insider Buying
2026-07-21
PRQR insider Filius Bart (Director) bought 150,000 shares (~$257.9K)
Filius Bart, listed as Director at ProQR Therapeutics N.V., reported an open-market purchase of 150,000 PRQR shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.
The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
P |
Open-market purchase
|
150,000 |
$1.72 |
$257.9K |
Filing: Form 4 (Insider Transaction)
Insider: Filius Bart (Director)
Shares: 150,000
Est. Value: $257.9K
Form 4
Open-market purchase
Insider Buying
2026-07-13
PRQR insider de Boer Daniel Anton (Director, Chief Executive Officer) bought 150,000 shares (~$261.0K)
de Boer Daniel Anton, listed as Director, Chief Executive Officer at ProQR Therapeutics N.V., reported an open-market purchase of 150,000 PRQR shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.
The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
P |
Open-market purchase
|
150,000 |
$1.74 |
$261.0K |
Filing: Form 4 (Insider Transaction)
Insider: de Boer Daniel Anton (Director, Chief Executive Officer)
Shares: 150,000
Est. Value: $261.0K
Form 4
Open-market purchase
Insider Buying
2026-07-08
PRQR insider de Boer Daniel Anton (Director, Chief Executive Officer) bought 150,000 shares (~$238.5K)
de Boer Daniel Anton, listed as Director, Chief Executive Officer at ProQR Therapeutics N.V., reported an open-market purchase of 150,000 PRQR shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.
The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
P |
Open-market purchase
|
150,000 |
$1.59 |
$238.5K |
Filing: Form 4 (Insider Transaction)
Insider: de Boer Daniel Anton (Director, Chief Executive Officer)
Shares: 150,000
Est. Value: $238.5K
Form 4
Open-market purchase
Insider Buying
2026-06-30
PRQR insider Filius Bart (Director) bought 150,000 shares (~$231.0K)
Filius Bart, listed as Director at ProQR Therapeutics N.V., reported an open-market purchase of 150,000 PRQR shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.
The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
P |
Open-market purchase
|
150,000 |
$1.54 |
$231.0K |
Filing: Form 4 (Insider Transaction)
Insider: Filius Bart (Director)
Shares: 150,000
Est. Value: $231.0K
Form 4
Compensation award
Tax / Compensation Filing
2026-06-03
PRQR insider Form 4 filed for equity award, exercise, or tax withholding
Hinsch Gylvin Lykke (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
A |
Compensation award
derivative · Share Option (Right to Buy)
|
14,495 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Hinsch Gylvin Lykke (Director)