Among active 13F managers last quarter, 11 opened and 19 added, while 10 reduced; the largest holder to move was Atlas Venture Life Science Advisors, LLC (−15%). Over the last 180 days, 6 insiders sold and 1 insider bought, a net -$4.9M in open-market trades.
The legs disagree, or only one of them leans.
91 tracked 13F filers disclose a position in KRRO as of the latest SEC 13F filings, a combined $164.0M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Lynx1 Capital Management LP | 1.5M | $20.3M | —Held | Q2 2026 | |
| 2 | NEA Management Company, LLC | 1.3M | $17.1M | —Held | Q2 2026 | |
| 3 | Balyasny Asset Management L.P. | 1.0M | $11.8M | ▲New +1.0M sh | Q1 2026 | |
| 4 | Venrock Adviser, LLC | 1.0M | $13.3M | —Held | Q2 2026 | |
| 5 | Atlas Venture Life Science Advisors, LLC | 963K | $12.7M | ▼−15% Reduced · −174K sh | Q2 2026 | |
| 6 | BlackRock, Inc. | 818K | $10.8M | ▲+78% Added · +358K sh | Q2 2026 | |
| 7 | Affinity Asset Advisors, LLC | 707K | $8.0M | ▲New +707K sh | Q1 2026 | |
| 8 | Nantahala Capital Management, LLC | 660K | $8.7M | —Held | Q2 2026 | |
| 9 | ADAR1 Capital Management, LLC | 540K | $6.1M | ▲New +540K sh | Q1 2026 | |
| 10 | Vanguard Capital Management LLC | 455K | $6.0M | ▲+46% Added · +144K sh | Q2 2026 | |
| 11 | TCG Crossover Management, LLC | 416K | $5.5M | —Held | Q2 2026 | |
| 12 | Kalehua Capital Management LLC | 405K | $5.3M | ▲+270% Added · +296K sh | Q2 2026 | |
| 13 | Siren, L.L.C. | 348K | $4.6M | —Held | Q2 2026 | |
| 14 | Geode Capital Management, LLC | 297K | $3.9M | ▲+71% Added · +123K sh | Q2 2026 | |
| 15 | AQR Capital Management LLC | 268K | $3.0M | ▲+559% Added · +227K sh | Q1 2026 | |
| 16 | State Street Corp | 233K | $3.1M | ▲+66% Added · +92K sh | Q2 2026 | |
| 17 | Adage Capital Partners GP, L.L.C. | 228K | $2.6M | ▲New +228K sh | Q1 2026 | |
| 18 | Vanguard Portfolio Management LLC | 224K | $2.9M | ▲+50% Added · +75K sh | Q2 2026 | |
| 19 | Two Sigma Investments, LP | 165K | $1.9M | ▲+110% Added · +86K sh | Q1 2026 | |
| 20 | Renaissance Technologies LLC | 136K | $1.5M | ▲+82% Added · +61K sh | Q1 2026 | |
| 21 | Jane Street Group, LLC | 116K | $1.3M | ▼−60% Reduced · −173K sh | Q1 2026 | |
| 22 | Vanguard Fiduciary Trust Co | 75K | $987K | ▲+80% Added · +33K sh | Q2 2026 | |
| 23 | JPMorgan Chase & Co | 69K | $704K | ▲24× Added · +66K sh | Q1 2026 | |
| 24 | Millennium Management LLC | 64K | $720K | ▼−61% Reduced · −97K sh | Q1 2026 | |
| 25 | Emerald Mutual Fund Advisers Trust | 64K | $838K | ▲+1.1% Added · +707 sh | Q2 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 11 funds opened a new position in KRRO and 19 added to an existing one, while 10 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Their position there |
|---|---|---|
| Cogent Biosciences IncCOGT | 41 funds | $862.8M |
| Alphabet Inc-CL AGOOGL | 40 funds | $63.1B |
| Amazon.com IncAMZN | 40 funds | $59.5B |
| Broadcom IncAVGO | 40 funds | $54.7B |
| Eli Lilly & CoLLY | 40 funds | $29.5B |
| Tesla IncTSLA | 40 funds | $25.9B |
| Intuitive Surgical IncISRG | 40 funds | $8.5B |
| Capital One Financial CorpCOF | 40 funds | $5.1B |
| Nvidia CorpNVDA | 39 funds | $143.2B |
| Apple IncAAPL | 39 funds | $101.6B |
| Microsoft CorpMSFT | 39 funds | $75.7B |
| Meta Platforms Inc-Class AMETA | 39 funds | $34.6B |
Ranked by how many of KRRO's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in KRRO.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Sep 11, 2026 | Dolan Oliver | Senior Vice President, Finance | Sell (S) | 5 | $69 |
| Sep 9, 2026 | Dolan Oliver | Senior Vice President, Finance | Sell (S) | 6 | $82 |
| Sep 8, 2026 | Dolan Oliver | Senior Vice President, Finance | Sell (S) | 7K | $99K |
| Aug 26, 2026 | Formela Jean Francois | Director | Sell (S) 2 lots, same day | 300 | $4K |
| Aug 19, 2026 | Formela Jean Francois | Director | Sell (S) 2 lots, same day | 28K | $399K |
| Aug 11, 2026 | Formela Jean Francois | Director | Sell (S) 2 lots, same day | 2K | $30K |
| Aug 10, 2026 | Lynx1 Capital Management LP | 10% Owner | Buy (P) | 1K | $19K |
| Aug 6, 2026 | Lynx1 Capital Management LP | 10% Owner | Buy (P) | 5K | $60K |
| Aug 4, 2026 | Aiyar Ram | President and CEO, Director | Sell (S) | 6K | $63K |
| Jul 6, 2026 | Formela Jean Francois | Director | Sell (S) 2 lots, same day | 9K | $130K |
| Jul 2, 2026 | Formela Jean Francois | Director | Sell (S) 2 lots, same day | 101K | $1.4M |
| Jun 24, 2026 | Formela Jean Francois | Director | Sell (S) 4 lots, same day | 48K | $707K |
One row per insider, day and transaction code; shares and value are summed across the lots. Every lot is on the full insider page and in the filing.
Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.
Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive
| Source | Buying | Selling | Net |
|---|---|---|---|
13F funds Top 100 holders by value, passive included; the hero counts active managers only | 40 | 21 | – |
Insiders Form 4 open-market | 1 | 6 | -$4.9M |
US House STOCK Act trades | 0 | 0 | $0 |
Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.
Connected entities for KRRO
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/KRRO/capital-change-brief"
Use Arkolith's capital_change_brief for KRRO. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for KRRO. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.