Insider · CIK 0001573160
James Huang
Files at ATRA (Atara Biotherapeutics, Inc.), CNTB (Connect Biopharma Holdings Ltd). First filing Jul 21, 2025, latest Jun 2, 2026.
In brief
James Huang files SEC Form 4 as director and 10% owner at ATRA (Atara Biotherapeutics, Inc.), and also at CNTB (Connect Biopharma Holdings Ltd). Since Jul 21, 2025, James Huang has reported 4 open-market buys worth $5.2M and 2 open-market sells worth $3.7M, the latest filed on Jun 2, 2026.
A track record needs three past buys with six months of prices behind them; James Huang has 0, so none is measured yet.
The newest scored trade: bought $372k of CNTB on May 29, 2026, filed Jun 2, 2026, scored 35 (weak). In the last 12 months: 2 buys worth $4.4M and 2 sells worth $3.7M.
Where the trades landed
Last year at the 2 companies this insider has traded most, with each buy and sell on the bar it happened.
ATRA: Atara Biotherapeutics, Inc.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
CNTB: Connect Biopharma Holdings Ltd
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 35Weak | CNTBbuy Connect Biopharma Holdings Ltd | $372k 150,000 shares | +1% | - | |
| 60Notable | Atara Biotherapeutics, Inc. | $3.2M 313,446 shares | -24% | +138% from low-45% from high | |
| 43Moderate | CNTBbuy Connect Biopharma Holdings Ltd | $4.0M 1,160,000 shares | +10% | - | |
| 33Weak | ATRAsell Atara Biotherapeutics, Inc. | $489k 80,554 shares | -6% | +11% from low-68% from high | |
| 48Moderate | ATRAbuy Atara Biotherapeutics, Inc. | $670k 55,000 shares | +4% | +132% from low-32% from high | |
| 35Weak | ATRAbuy Atara Biotherapeutics, Inc. | $186k 19,335 shares | +1% | +83% from low-46% from high |
Transactions
Every row this insider has filed, 12 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| May 29, 2026 | CNTB Connect Biopharma Holdings Ltd | POpen-market purchase Ordinary Sharesindirect: See Footnote | +150,000 | $2.48 | $372k | 13,310,000 | Jun 2, 2026 |
| May 7, 2026 | ATRA Atara Biotherapeutics, Inc. | SOpen-market sale Common Stockindirect: See Footnote | -313,446 | $10.10 | $3.2M | 1,011,000 | May 11, 2026 |
| Mar 31, 2026 | CNTB Connect Biopharma Holdings Ltd | POpen-market purchase Ordinary Sharesindirect: See Footnote | +1,160,000 | $3.45 | $4.0M | 13,160,000 | Apr 1, 2026 |
| Mar 17, 2026 | ATRA Atara Biotherapeutics, Inc. | MOption exercise Common Stockindirect: See Footnotes | +259,163 | $0.00 | $26 | 307,899 | Mar 19, 2026 |
| Mar 17, 2026 | ATRA Atara Biotherapeutics, Inc. | FTax withholding Common Stockindirect: See Footnotes | -5 | $5.23 | $26 | 307,894 | Mar 19, 2026 |
| Mar 17, 2026 | ATRA Atara Biotherapeutics, Inc. | MOption exercise Warrantsderivativeindirect: See Footnotes | -259,163 | $6.61 | $1.7M | 0 | Mar 19, 2026 |
| Jan 12, 2026 | ATRA Atara Biotherapeutics, Inc. | SOpen-market sale Common Stockindirect: See Footnotes | -80,554 | $6.07 | $489k | 1,324,446 | Jan 14, 2026 |
| Nov 28, 2025 | ATRA Atara Biotherapeutics, Inc. | MOption exercise Common Stockindirect: See Footnotes | +48,737 | $0.00 | $5 | 48,737 | Dec 1, 2025 |
| Nov 28, 2025 | ATRA Atara Biotherapeutics, Inc. | FTax withholding Common Stockindirect: See Footnotes | -1 | $14.03 | $14 | 48,736 | Dec 1, 2025 |
| Nov 28, 2025 | ATRA Atara Biotherapeutics, Inc. | MOption exercise Warrantsderivativeindirect: See Footnotes | -48,737 | $6.61 | $322k | 259,163 | Dec 1, 2025 |
| Aug 15, 2025 | ATRA Atara Biotherapeutics, Inc. | POpen-market purchase Common Stockindirect: See Footnotes | +55,000 | $12.19 | $670k | 1,405,000 | Aug 19, 2025 |
| Jul 17, 2025 | ATRA Atara Biotherapeutics, Inc. | POpen-market purchase Common Stockindirect: See Footnotes | +19,335 | $9.64 | $186k | 1,350,000 | Jul 21, 2025 |
Questions about James Huang
Answered from the filings on this page, as of the latest one.
Is James Huang buying or selling?
In the last 12 months James Huang reported 2 open-market buys worth $4.4M and 2 open-market sells worth $3.7M on SEC Form 4; the latest was bought $372k of CNTB on May 29, 2026. Grants, option exercises and tax withholding are not counted.
How did James Huang's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and James Huang has 0.
Where does James Huang file Form 4?
James Huang has filed Form 4 at ATRA (Atara Biotherapeutics, Inc.); CNTB (Connect Biopharma Holdings Ltd). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.