NASDAQ:PRTO

Proteon Therapeutics Stock Insider Trading

> Biotechnology

Buy PRTO

*Your capital is at risk

$27.88

-0.0562 (-0.201%)

At Close: Jun 03, 2026

Proteon Therapeutics Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at 0. In total, the insiders bought 26.7M and sold 73.04M PRTO shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	0
● Buy	26.7M shares
● Sell	73.04M shares
71% Buy Activity Negligible or No Correlation
No Significant Signals No statistically significant buy or sell signals detected in recent insider data.

Historical Insider Trades

Date	Type	Person	Role	Amount
Oct 27, 2014 Sell	Series B Convertible Preferred Stock C-Conversion	Tvm Life Science Ventures Vi Gmbh & Co Kg 10 Percent Owner	10% Owner	835 121 Value: $0
Oct 27, 2014 Sell	Series D Convertible Preferred Stock C-Conversion	Tvm Life Science Ventures Vi Gmbh & Co Kg 10 Percent Owner	10% Owner	1 277 663 Value: $0
Oct 27, 2014 Buy	Common Stock X-InTheMoney	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	121 760 Value: $560.4K
Oct 27, 2014 Sell	Common Stock S-Sale	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	56 038 Value: $560.4K
Oct 27, 2014 Buy	Common Stock C-Conversion	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	1 167 208 Value: $0
Oct 27, 2014 Buy	Common Stock P-Purchase	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	200 000 Value: $2.00M
Oct 27, 2014 Sell	Series A-1 Convertible Preferred Stock C-Conversion	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	2 341 664 Value: $0
Oct 27, 2014 Sell	Warrants (Right to Buy) X-InTheMoney	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	121 760 Value: $560.4K
Oct 27, 2014 Sell	Option (Right to Purchase) J-Other	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	1 389 064 Value: $0
Oct 27, 2014 Sell	Series B Convertible Preferred Stock C-Conversion	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	2 173 913 Value: $0
Oct 27, 2014 Sell	Series C Convertible Preferred Stock C-Conversion	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	2 436 437 Value: $0
Oct 27, 2014 Sell	Series D Convertible Preferred Stock C-Conversion	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	3 932 747 Value: $0
Oct 27, 2014 Sell	Series A Convertible Preferred Stock C-Conversion	Skyline Venture Partners Qualified Purchaser Fund Iv L P 10 Percent Owner	10% Owner	5 000 000 Value: $0
Oct 27, 2014 Buy	Common Stock C-Conversion	Haines Timothy	Director	1 067 872 Value: $0
Oct 27, 2014 Buy	Common Stock P-Purchase	Haines Timothy	Director	950 000 Value: $9.50M
Oct 27, 2014 Sell	Series D Convertible Preferred Stock C-Conversion	Haines Timothy	Director	16 044 081 Value: $0
Oct 27, 2014 Sell	Option (Right to Purchase) J-Other	Haines Timothy	Director	12 835 264 Value: $0
Oct 27, 2014 Buy	Common Stock C-Conversion	Kobyzev Dmitry	Director	565 344 Value: $0
Oct 27, 2014 Buy	Common Stock P-Purchase	Kobyzev Dmitry	Director	600 000 Value: $6.00M
Oct 27, 2014 Sell	Series D Convertible Preferred Stock C-Conversion	Kobyzev Dmitry	Director	8 493 925 Value: $0
Oct 27, 2014 Sell	Option (Right to Purchase) J-Other	Kobyzev Dmitry	Director	6 795 140 Value: $0
Oct 27, 2014 Buy	Common Stock P-Purchase	Flynn James E Possible Member Of 10% Group	10% Owner	469 495 Value: $4.69M
Oct 27, 2014 Buy	Common Stock C-Conversion	Flynn James E Possible Member Of 10% Group	10% Owner	406 896 Value: $0
Oct 27, 2014 Buy	Common Stock P-Purchase	Flynn James E Possible Member Of 10% Group	10% Owner	55 Value: $550
Oct 27, 2014 Buy	Common Stock P-Purchase	Flynn James E Possible Member Of 10% Group	10% Owner	328 Value: $3K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT PROTEON THERAPEUTICS INC.

Proteon Therapeutics, Inc., a late-stage biopharmaceutical company, focuses on the development of pharmaceuticals to address the needs of patients with renal and vascular diseases. It develops vonapanitase, a recombinant human elastase, which is in two Phase III clinical trials in patients with chronic kidney disease undergoing surgical creation of a radiocephalic arteriovenous fistula for hemodialysis; has completed a Phase I/II clinical trials ...

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