Leon O. Moulder Jr.

CEO · Zenas BioPharma, Inc.

Rank #1,522 SEC EDGAR (United States) ↗ Files from United States

Details

Officer and board memberPharmaceuticals & BiotechnologyZBIOSEC CIK 0001228865

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

Disclosed holdings
$70.7M
1-day change
▼ 0.12%
Positions on file
2
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$34.6M – $91.3M2026-09-04

Insider activity Jun 18, 2024 – Mar 31, 2026

Leon O. Moulder Jr. is recorded in filings to the U.S. SEC via EDGAR as officer and board member, and reported 22 transactions between Jun 18, 2024 and Mar 31, 2026. 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)
$5.85M
16 purchases on file priced rows only
Open-market sales (code S)
None
0 sales on file
All reported transactions
22
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 Zenas BioPharma, Inc. (ZBIO) shares worth $6,658,538 between Mar 30, 2026 and Apr 29, 2026

Cluster buying

3 different insiders made 7 open-market purchases of this company’s shares within a short window. Each row below is one reported trade.

3 insiders bought Zenas BioPharma, Inc. (ZBIO) shares worth $6,658,538 between Mar 30, 2026 and Apr 29, 2026
Date Insider Transaction Shares Price Value Filing
Mar 30, 2026 Leon O. Moulder Jr. P Open-market purchase 20,000 held after: 1,692,039 $18.23 $364,600 SEC filing ↗
Mar 31, 2026 Leon O. Moulder Jr. P Open-market purchase 34,000 held after: 1,726,039 $19.31 $656,540 SEC filing ↗
Mar 31, 2026 Hongbo Lu P Open-market purchase 75,000 held after: 422,968 $20.00 $1,500,000 SEC filing ↗
Mar 31, 2026 Tomas Kiselak P Open-market purchase 150,000 held after: 2,359,025 $20.00 $3,000,000 SEC filing ↗
Mar 31, 2026 Hongbo Lu P Open-market purchase 3,768 held after: 426,736 $18.63 $70,198 SEC filing ↗
Apr 28, 2026 Leon O. Moulder Jr. P Open-market purchase 25,000 held after: 1,751,039 $18.02 $450,500 SEC filing ↗
Apr 29, 2026 Leon O. Moulder Jr. P Open-market purchase 35,000 held after: 1,786,039 $17.62 $616,700 SEC filing ↗

Total of the rows above: $6,658,538, 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 25 most recent rows are grouped into 21 lines by date, company and transaction type — open a line to see every lot with its own source link. We hold 26 on file in total. See the full history on EDGAR ↗

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. Zai Lab Ltd ZLAB A Grant or awardnot a buy/sell decisionreported at zero 22,371 shares $0 at $0.00 SEC filing ↗
  2. Zenas BioPharma, Inc. ZBIO P Open-market purchase 60,000 shares $1.01M at $16.88 SEC filing ↗
  3. Zenas BioPharma, Inc. ZBIO P Open-market purchase 35,000 shares $616.7K at $17.62 SEC filing ↗
  4. Zenas BioPharma, Inc. ZBIO P Open-market purchase 25,000 shares $450.5K at $18.02 SEC filing ↗
  5. Zenas BioPharma, Inc. ZBIO P Open-market purchase 34,000 shares $656.5K at $19.31 SEC filing ↗
  6. Zenas BioPharma, Inc. ZBIO P Open-market purchase 20,000 shares $364.6K at $18.23 SEC filing ↗
  7. Zenas BioPharma, Inc. ZBIO P Open-market purchase 57,000 shares $1.02M at $17.96 SEC filing ↗
  8. Zenas BioPharma, Inc. ZBIO P Open-market purchase 20,000 shares $331.0K at $16.55 SEC filing ↗
  9. Zenas BioPharma, Inc. ZBIO P Open-market purchase 30,000 shares $489.0K at $16.30 SEC filing ↗
  10. Zenas BioPharma, Inc. ZBIO P Open-market purchase 50,000 shares $819.0K at $16.38 SEC filing ↗
  11. Zenas BioPharma, Inc. ZBIO P Open-market purchase 36,928 shares $769.9K at $20.85 SEC filing ↗
  12. Zai Lab Ltd ZLAB A Grant or awardnot a buy/sell decisionreported at zero 10,831 shares $0 at $0.00 SEC filing ↗
  13. Zenas BioPharma, Inc. ZBIO P Open-market purchase 25,000 shares $166.8K at $6.67 SEC filing ↗
  14. Zenas BioPharma, Inc. ZBIO P Open-market purchase 45,000 shares $449.1K at $9.98 SEC filing ↗
  15. Zenas BioPharma, Inc. ZBIO P Open-market purchase 25,000 shares $269.0K at $10.76 SEC filing ↗
  16. Zenas BioPharma, Inc. ZBIO P Open-market purchase 2,500 shares $36.4K at $14.57 SEC filing ↗
  17. Zenas BioPharma, Inc. ZBIO P Open-market purchase 7,500 shares $112.5K at $15.00 SEC filing ↗
  18. Zenas BioPharma, Inc. ZBIO P Open-market purchase × 2 5,000 shares $92.3K
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    2,367 $17.88 $42.3K SEC filing ↗
    2,633 $18.97 $49.9K SEC filing ↗
  19. Zenas BioPharma, Inc. ZBIO P Open-market purchase 5,000 shares $89.5K at $17.89 SEC filing ↗
  20. Zenas BioPharma, Inc. ZBIO P Open-market purchase 10,000 shares $179.1K at $17.91 SEC filing ↗
  21. Zenas BioPharma, Inc. ZBIO C Conversion of derivative × 4not a buy/sell decisionreported at zero 693,175 shares $0
    The 4 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    372,017 $0.00reported at zero $0 SEC filing ↗
    164,523 $0.00reported at zero $0 SEC filing ↗
    108,381 $0.00reported at zero $0 SEC filing ↗
    48,254 $0.00reported at zero $0 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
Zenas BioPharma, Inc. ZBIO Common Stock (indirect) 2,149,194 $32.88 $70.7M 4 EDGAR ↗
Zai Lab Ltd — American Depositary Shares 72,602 — — 4 EDGAR ↗

Other insiders at the same companies

People who also file with the SEC at a company where Leon O. Moulder Jr. 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.