Transaction · 0001213900-26-062322

Yang Alex Keun Mo

Yang Alex Keun Mo, CEO, reported an open-market or private purchase at Polaryx Therapeutics, Inc. involving 88453.000000 shares for an estimated $360003.71. Reported holdings after the transaction were 24233249.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market buySEC transaction code PCEO
PLYXPolaryx Therapeutics, Inc.
Trade date
May 27, 2026
Filing date
May 29, 2026
View on SEC Insider profile
Disclosed value$360kShares × reported price
Shares traded88.4k$4.07 per share
Holdings after24.2MIndirect · By Mstone Partners Healthcare Limited
% of reported position traded0.37%This security and ownership context
How reported position traded is calculated

Shares purchased ÷ (holdings after − shares purchased). Estimated position before: 24,144,796 shares.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

PLYX price since this filing

Daily closing prices, with the filing date and available return windows
PLYX · Daily closing priceLoading daily prices…
Filing dateReturn windows appear as prices become available.
Pre-filing1mo ago +55.0%1w ago +3.4%1d ago -21.1%
Returns since7d -28.7%30d -26.6%90d -35.5%180d1y

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Buy
Code P
Identifier
0001213900-26-062322
Common Stock
Transaction date
May 27, 2026
Filed May 29, 2026, 12:00 AM · 2d delay
Shares
88,453 sh
$4.07 per share
Estimated value
$360k
Computed from shares × price
Holdings after
24,233,249 sh
Indirect · By Mstone Partners Healthcare Limited

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
CEO Buy Cluster Buy Director Buy 10% Owner Buy
Filing-only score

+42 points

Compact filing score computed from stored Form 4 facts. Version v1.

Strong filing signal

This filing has a high positive filing-only score. It may deserve closer research, but it is not an investment recommendation.

How this score is calculated
  • open_market_purchase+12 points

    transaction_code = P

    Code P is a discretionary open-market purchase.
  • ceo_buy+12 points

    is_officer + officer_title/role mentions CEO

    CEO open-market purchase.
  • cluster_buy+14 points

    cluster-buy signal matched

    Multiple insiders bought within the configured window.
  • timely_filing+4 points

    reporting_delay_days = 2

    Filing reported within two business days of the transaction.
Read the scoring methodology

Signed filing-only points, not a probability or expected return. Version v1.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chief Executive Officer

Officer YesDirector Yes10% YesOther No
Footnotes & amended
  1. F1

    As disclosed in the Issuer's Form 8-K filed with the Securities and Exchange Commission on May 28, 2026, MStone Partners Healthcare Limited ("Mstone") purchased 88,453 shares of common stock in a priv…

  2. F2

    Alex Keun Mo Yang is the founder and Chief Executive Officer of Mstone. Mr. Yang disclaims beneficial ownership over any of the reported securities, except to the extent of his pecuniary interest ther…

Original filing · 0001213900-26-062322
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