PRQR SEC Filing News — ProQR Therapeutics N.V.

Latest SEC filings for ProQR Therapeutics N.V. (PRQR) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-08-03.

ProQR Therapeutics N.V., a clinical-stage biotechnology company, focuses on the discovery and development of novel therapeutic medicines. The company develops an RNA editing platform through its Axiomer RNA editing technology for genetic disorders with unmet needs. Its lead product candidate, AX-0810, targets na-taurocholate cotransporting polypeptide (NTCP) for the treatment of cholestatic diseases. The company also develops AX-2402, which targets methyl CpG binding protein 2 mutations for Rett…
Sector: Healthcare Industry: Biotechnology Market Cap: $187.7M CIK: 1612940
7
Total Filings
5
Bullish Classifications
0
Bearish Classifications
6
Insider Transactions
0
Material Events (8-K)
0
Periodic Reports
Rule-based classifications for PRQR currently lean bullish. Of the 7 displayed SEC filing records, 5 carry bullish classifications versus 0 bearish classifications. These labels summarize filing attributes; they are not recommendations, probabilities, or evidence of future price direction. There were 6 insider transactions (Form 4) in this period.
PRQR Filing Activity Snapshot 2015-07-28 — 2026-08-03
Insider Transactions (Form 4)
5 buys vs 0 sells
Net insider buying in this period — more purchases than sales reported.
Largest Form 144 Filing
$354.0K
de Boer Daniel Anton (Director, Chief Executive Officer) · 2026-08-03
200,000 shares · Form 4
Form 144 Notices
1
Proposed insider sale filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 6 · Forms 3, 4 and 5

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.

What each transaction type means

Open-market purchase ×5
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.
Compensation award ×1
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.
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)
Proposed Insider Sales 1 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. ProQR Therapeutics N.V. has 1 such notice in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2015-07-28

PRQR Form 144 filed for proposed insider sale

An insider at ProQR Therapeutics N.V. filed a Form 144 notifying the SEC of an intent to sell shares. Form 144 is a proposed sale notice rather than confirmation that a sale already happened.

Filing: Form 144 (Proposed Sale Notice)

How we classify ProQR Therapeutics N.V.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on PRQR. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — PRQR SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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