BIOA · Insider trading · 13F holders · Congress trades
BioAmber Inc. (BIOA)
Who is buying and selling BIOA: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 22
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 1
BIOA at a glance
- No open-market insider purchases or sales of BIOA were filed in the last 90 days.
- 22 13F filers hold BIOA among their 50 largest positions, worth $438.7M combined, including Peter Kolchinsky. The biggest bets by portfolio weight are Pivotal bioVenture Partners Investment Advisor LLC (5.2%), Octagon Capital Advisors LP (3.9%) and Sands Capital Alternatives, LLC (3.1%). In their latest 13Fs, 4 managers opened a new position and 2 added to one.
- Members of Congress have disclosed 4 BIOA trades since 2014, 0 purchases and 1 sale in the past year; the latest was Suzan K. DelBene (D-WA), selling $1K–15K on Jun 9, 2016.
- BIOA last closed at $5.78 on Oct 30, 2026.
BIOA insider trading
No open-market insider purchases or sales of BIOA were filed in the last 90 days.
Who owns BIOA? Hedge funds and superinvestors
22 13F filers hold BIOA among their 50 largest positions, worth $438.7M combined, including Peter Kolchinsky. The biggest bets by portfolio weight are Pivotal bioVenture Partners Investment Advisor LLC (5.2%), Octagon Capital Advisors LP (3.9%) and Sands Capital Alternatives, LLC (3.1%). In their latest 13Fs, 4 managers opened a new position and 2 added to one.
Superinvestors holding BIOA: Peter Kolchinsky 0.4%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| a16z Capital Management, L.L.C.Hedge fund | 0.6% | $79.2M | 3,233,170 | +0.0% shares | Q2 2026 |
| Cormorant Asset Management, LPHedge fund | 3.0% | $58.6M | 2,390,605 | -17.3% shares | Q2 2026 |
| Sofinnova Investments, Inc.Hedge fund | 3.0% | $56.2M | 2,293,788 | +0.0% shares | Q2 2026 |
| Octagon Capital Advisors LPHedge fund | 3.9% | $42.8M | 1,748,000 | +0.0% shares | Q2 2026 |
| Peter KolchinskyHedge fund | 0.4% | $41.0M | 1,671,648 | +1.3% shares | Q2 2026 |
| Mpm Bioimpact LLCHedge fund | 2.5% | $40.9M | 1,667,661 | New | Q2 2026 |
| Braidwell LPHedge fund | 1.0% | $25.3M | 1,033,129 | — | Q2 2026 |
| Sands Capital Alternatives, LLCHedge fund | 3.1% | $19.3M | 786,353 | +0.0% shares | Q2 2026 |
| Pivotal bioVenture Partners Investment Advisor LLCVenture capital | 5.2% | $16.0M | 653,374 | +0.0% shares | Q2 2026 |
| Cosmic Management, LLCHedge fund | 3.2% | $12.3M | 501,833 | — | Q2 2026 |
| Stempoint Capital LPHedge fund | 2.0% | $11.4M | 464,171 | +37.1% shares | Q2 2026 |
| Comprehensive Financial Management LLCWealth manager | 0.2% | $6.7M | 271,842 | +0.0% shares | Q2 2026 |
| Sphera Funds Management Ltd.Hedge fund | 0.7% | $5.2M | 213,671 | — | Q2 2026 |
| Ikarian Capital, LLCHedge fund | 0.8% | $4.9M | 200,000 | — | Q2 2026 |
| Yiheng Capital Management, L.P.Hedge fund | 1.8% | $4.2M | 170,532 | New | Q2 2026 |
| Squadron Capital Management LLCHedge fund | 1.3% | $3.8M | 155,000 | New | Q2 2026 |
| Diadema Partners LPHedge fund | 1.4% | $3.6M | 146,334 | +143.9% shares | Q2 2026 |
| NEXTBio Capital Management LPHedge fund | 1.1% | $2.5M | 100,732 | New | Q2 2026 |
| Alessandra Capital Management, LLCWealth manager | 1.6% | $2.3M | 93,368 | -13.4% shares | Q2 2026 |
| Birchview Capital, LPWealth manager | 0.8% | $1.7M | 69,000 | — | Q2 2026 |
| Stonepine Capital Management, LLCHedge fund | 0.4% | $490K | 20,000 | -60.0% shares | Q2 2026 |
| Valor Management LLCHedge fund | 0.0% | $321K | 13,105 | +0.0% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 22). Screen BIOA in the grand portfolio →
BIOA stock trades by members of Congress
Members of Congress have disclosed 4 BIOA trades since 2014, 0 purchases and 1 sale in the past year; the latest was Suzan K. DelBene (D-WA), selling $1K–15K on Jun 9, 2016.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Jul 13, 2016 | Suzan K. DelBeneD-WA · House | Sale | $1K–15K | Jun 9, 2016 | — |
| Nov 20, 2014 | Suzan K. DelBeneD-WA · House | Buy | $1K–15K | Oct 10, 2014 | — |
| Nov 20, 2014 | Suzan K. DelBeneD-WA · House | Buy | $1K–15K | Oct 9, 2014 | — |
| Aug 17, 2014 | Suzan K. DelBeneD-WA · House | Buy | $15K–50K | Jul 24, 2014 | — |
BIOA questions and answers
Are insiders buying BIOA stock?
No open-market insider purchases or sales of BIOA were filed in the last 90 days.
Which hedge funds own BIOA?
22 13F filers hold BIOA among their 50 largest positions, worth $438.7M combined, including Peter Kolchinsky. The biggest bets by portfolio weight are Pivotal bioVenture Partners Investment Advisor LLC (5.2%), Octagon Capital Advisors LP (3.9%) and Sands Capital Alternatives, LLC (3.1%). In their latest 13Fs, 4 managers opened a new position and 2 added to one.
Has Congress traded BIOA?
Members of Congress have disclosed 4 BIOA trades since 2014, 0 purchases and 1 sale in the past year; the latest was Suzan K. DelBene (D-WA), selling $1K–15K on Jun 9, 2016.
Who is the largest holder of BIOA?
Among 13F filers, a16z Capital Management, L.L.C. reports the largest BIOA position, $79.2M (3,233,170 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Pivotal bioVenture Partners Investment Advisor LLC's: 5.2% of its portfolio.
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