Thomas C. Chen

CEO · NEONC TECHNOLOGIES HOLDINGS, INC.

Rank #4,437 SEC EDGAR (United States) ↗ Files from United States

Details

Officer and board memberPharmaceuticals & BiotechnologyNTHISEC CIK 0001998682

Computed from SEC EDGAR filings and closing prices — not copied from any wealth ranking. Dataset . How we calculate this.

Disclosed holdings
$18.8M
1-day change
▲ 5.01%
Positions on file
1
issuers disclosed in Forms 3/4/5 and Schedules 13D/G

Disclosed holdings over time 53 weekly points

What the 1 currently disclosed position would have been worth at each week’s closing price. A rising line means the shares got more valuable, not that this person bought more.

How the line is built

Share counts are as last reported to the SEC and held constant; only prices move.

2025-09-05$12.8M – $44.8M2026-09-04

Insider activity Mar 26, 2025 – May 22, 2025

Thomas C. Chen is recorded in filings to the U.S. SEC via EDGAR as officer and board member, and reported 11 transactions between Mar 26, 2025 and May 22, 2025. The buy and sell totals below count only codes P, S.

Why the other codes are excluded

Share awards (A), shares withheld to pay tax (F), option exercises (M) and gifts (G) also appear in the table, but they are consequences of a pay package or a private transfer, not a decision to buy or sell on the open market. Counting them would turn this into a compensation ranking.

Open-market buys (code P)
$42.8K
3 purchases on file priced rows only
Open-market sales (code S)
$1.95M
4 sales on file priced rows only
All reported transactions
11
every code, including awards and exercises
Pattern
Net buyer in the final 12 months of the window
last 12 months of the window

Events from filings

Detected automatically in the filings linked below. Each headline is built from the numbers in those filings, not written by a model. Newest first; events older than 45 days stay listed and are marked as older.

3 insiders bought NEONC TECHNOLOGIES HOLDINGS, INC. (NTHI) shares worth $119,886 between May 16, 2025 and May 23, 2025

Cluster buying

3 different insiders made 6 open-market purchases of this company’s shares within a short window. Each row below is one reported trade. At least one price in this event could not be cross-checked against other trades in the same security, so read the total with extra care.

3 insiders bought NEONC TECHNOLOGIES HOLDINGS, INC. (NTHI) shares worth $119,886 between May 16, 2025 and May 23, 2025
Date Insider Transaction Shares Price Value Filing
May 16, 2025 Amir F Heshmatpour P Open-market purchase 3,510 held after: 1,760,000 $16.87 $59,214 SEC filing ↗
May 19, 2025 Keithly Garnett P Open-market purchase 135 held after: 240,225 $7.23 $976 SEC filing ↗
May 21, 2025 Thomas C. Chen P Open-market purchase 2,759 held after: 548,959 $7.25 $20,003 SEC filing ↗
May 22, 2025 Keithly Garnett P Open-market purchase 675 held after: 240,900 $7.29 $4,921 SEC filing ↗
May 22, 2025 Thomas C. Chen P Open-market purchase 2,709 held after: 551,668 $7.38 $19,992 SEC filing ↗
May 23, 2025 Amir F Heshmatpour P Open-market purchase 2,000 held after: 1,762,000 $7.39 $14,780 SEC filing ↗

Total of the rows above: $119,886, in the currency the filings report.

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

3 insiders bought NEONC TECHNOLOGIES HOLDINGS, INC. (NTHI) shares worth $52,343 between Apr 15, 2025 and May 15, 2025

Cluster buying

3 different insiders made 8 open-market purchases of this company’s shares within a short window. Each row below is one reported trade.

3 insiders bought NEONC TECHNOLOGIES HOLDINGS, INC. (NTHI) shares worth $52,343 between Apr 15, 2025 and May 15, 2025
Date Insider Transaction Shares Price Value Filing
Apr 15, 2025 Keithly Garnett P Open-market purchase 300 held after: 241,200 $5.38 $1,614 SEC filing ↗
May 11, 2025 Amir F Heshmatpour P Open-market purchase 1,600 held after: 1,751,600 $7.51 $12,016 SEC filing ↗
May 12, 2025 Amir F Heshmatpour P Open-market purchase 1,400 held after: 1,753,000 $7.23 $10,122 SEC filing ↗
May 12, 2025 Thomas C. Chen P Open-market purchase 400 held after: 546,200 $7.00 $2,800 SEC filing ↗
May 13, 2025 Amir F Heshmatpour P Open-market purchase 990 held after: 1,753,990 $7.01 $6,940 SEC filing ↗
May 13, 2025 Keithly Garnett P Open-market purchase 90 held after: 240,090 $7.01 $631 SEC filing ↗
May 14, 2025 Amir F Heshmatpour P Open-market purchase 1,000 held after: 1,754,990 $7.27 $7,270 SEC filing ↗
May 15, 2025 Amir F Heshmatpour P Open-market purchase 1,500 held after: 1,756,490 $7.30 $10,950 SEC filing ↗

Total of the rows above: $52,343, in the currency the filings report.

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

Reported transactions

Price 0.00 is a real reported figure on gifts (G) and share awards (A) — not a missing number. The 12 most recent rows are grouped into 11 lines by date, company and transaction type — open a line to see every lot with its own source link.

How to read this list

Every row is one line of one Form 4 or Form 5, with the filing it came from. Where the record carries no price at all we leave the cell empty instead of guessing one.

The shares and money on a grouped line add up only the lots listed inside that line, and only when every one of them carries the figure. Where a group mixes more than one reporting currency we leave the money blank rather than convert — no source publishes the rate that conversion would need.

  1. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 12,757 shares $70.0K at $5.49 SEC filing ↗
  2. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 2,472 shares $10.0K at $4.04 SEC filing ↗
  3. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 33,787 shares $130.1K at $3.85 SEC filing ↗
  4. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 10,000 shares $48.0K at $4.80 SEC filing ↗
  5. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 948 shares $4.9K at $5.17 SEC filing ↗
  6. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 2,709 shares $20.0K at $7.38 SEC filing ↗
  7. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 2,759 shares $20.0K at $7.25 SEC filing ↗
  8. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI P Open-market purchase 400 shares $2.8K at $7.00 SEC filing ↗
  9. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI S Open-market sale × 2 39,233 shares $975.1K
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    38,250 $25.00 $956.3K SEC filing ↗
    983 $19.13 $18.8K SEC filing ↗
  10. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI J Other acquisition or dispositionnot a buy/sell decisionreported at zero 4,076 shares $0 at $0.00 SEC filing ↗
  11. NEONC TECHNOLOGIES HOLDINGS, INC. NTHI X In-the-money option exercisenot a buy/sell decision 79,688 shares $956.3K at $12.00 SEC filing ↗

Disclosed holdings

Shares is the amount on the form; value is that amount times the closing price shown. Rows with no closing price are left blank, so they may add up to less than the headline figure.

What is not counted here

Each row is one filing you can open. Private companies, real estate, bonds and crypto are not in SEC insider filings and are therefore not counted here.

Equity positions disclosed to the SEC, with the source filing behind each row.
Issuer Ticker Security Shares Close Value Form Reported Filing
NEONC TECHNOLOGIES HOLDINGS, INC. NTHI Common Stock (indirect) 3,740,124 $5.03 $18.8M 4 EDGAR ↗

Other insiders at the same companies

People who also file with the SEC at a company where Thomas C. Chen reports shares.

Sharing a filing does not mean they work together day to day — it means both names appear on the same issuer’s insider record.

Sources

The filings linked in the tables above are the sources for every figure on this page.

Think a number here is wrong? Open the linked filing and compare — how to report it.

Profile record last refreshed Sep 8, 2026.