CIK: 0001579984
Total reported value
$819.3M
Reporting period: 2017-09-30 · Number of holdings: 145
Ark Investment Management LLC disclosed 145 holdings in its latest 13F filing for the period ending 2017-09-30, with total reported value of $819.3M and a quarterly turnover rate of 0.0%.
Browse other institutions with $100M to $1B AUMBrowse other institutions starting with "A"
Ark Investment Management LLC's disclosed holdings carry a Herfindahl concentration index of 0.021 — mathematically equivalent to about 49 equally-sized positions, well below its 145 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 1.41), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 29% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
No holding changes this quarter
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | SSYS | Stratasys Ltd. | Stock-Other | 4.40% | — | — | — |
| 2 | AMZN | Amazon.com INC | Stock-Consumer Disc | 4.27% | — | — | — |
| 3 | ✓ | Athenahealth INC | Stock-Other | 3.70% | — | — | — |
| 4 | NVDA | Nvidia CORP | Stock-Tech | 3.53% | — | — | — |
| 5 | ✓ | Stock-Other | 3.39% | — | — | — | |
| 6 | TWTRUSD | Twitter INC | Stock-Other | 3.37% | — | — | — |
| 7 | ILMN | Illumina INC | Stock-Healthcare | 3.07% | — | — | — |
| 8 | BIDU | Baidu INC - Spon Adr | Stock-Comm Services | 2.89% | — | — | — |
| 9 | ✓ | Juno Therapeutics | Stock-Other | 2.85% | — | — | — |
| 10 | TSLA | Tesla INC | Stock-Consumer Disc | 2.64% | — | — | — |
| 11 | ✓ | Stock-Other | 2.26% | — | — | — | |
| 12 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 2.16% | — | — | — |
| 13 | NFLX | Netflix INC | Stock-Comm Services | 2.10% | — | — | — |
| 14 | SPLKCHF | Splunk INC | Stock-Other | 2.05% | — | — | — |
| 15 | EDIT | Editas Medicine INC | Stock-Other | 2.02% | — | — | — |
| 16 | ✓ | Stock-Other | 1.96% | — | — | — | |
| 17 | PRLB | Proto Labs INC | Stock-Other | 1.93% | — | — | — |
| 18 | XLNXEUR | Xilinx INC | Stock-Other | 1.85% | — | — | — |
| 19 | ✓ | Hortonworks, Inc. | Stock-Other | 1.85% | — | — | — |
| 20 | CRM | Salesforce INC | Stock-Tech | 1.82% | — | — | — |
| 21 | META | Meta Platforms Inc-class A | Stock-Comm Services | 1.81% | — | — | — |
| 22 | MCRB1EUR | Seres Therapeutics INC | Stock-Other | 1.75% | — | — | — |
| 23 | NVTA1EUR | Invitae CORP | Stock-Other | 1.67% | — | — | — |
| 24 | LCEUR | Happen INC | Stock-Other | 1.61% | — | — | — |
| 25 | TCEHY | Tencent Holdings Ltd-uns Adr | Stock-Other | 1.59% | — | — | — |
| 26 | IONS | Ionis Pharmaceuticals INC | Stock-Healthcare | 1.53% | — | — | — |
| 27 | ✓ | Foundation Medicine INC | Stock-Other | 1.53% | — | — | — |
| 28 | XONECHF | Exone Co/the | Stock-Other | 1.31% | — | — | — |
| 29 | BABA | Alibaba Group Holding-sp Adr | Stock-Consumer Disc | 1.30% | — | — | — |
| 30 | SFTBY | Softbank Group Corp-unsp Adr | Stock-Other | 1.26% | — | — | — |
| 31 | NTDOY | Nintendo Co Ltd-unspons Adr | Stock-Other | 1.18% | — | — | — |
| 32 | RHT1EUR | Red Hat INC | Stock-Other | 1.17% | — | — | — |
| 33 | XYZ | Block INC | Stock-Financials | 1.15% | — | — | — |
| 34 | TREE | Lendingtree INC | Stock-Other | 1.15% | — | — | — |
| 35 | NTLA | Intellia Therapeutics INC | Stock-Other | 1.13% | — | — | — |
| 36 | TER | Teradyne INC | Stock-Tech | 1.08% | — | — | — |
| 37 | AAPL | Apple INC | Stock-Tech | 1.07% | — | — | — |
| 38 | PYPL | Paypal Holdings INC | Stock-Financials | 1.06% | — | — | — |
| 39 | TWLO | Twilio INC - A | Stock-Tech | 1.05% | — | — | — |
| 40 | CTRPUSD | Ctrip.com International-adr | Stock-Other | 1.02% | — | — | — |
| 41 | MDSOEUR | Medidata Solutions INC | Stock-Other | 0.99% | — | — | — |
| 42 | AVAV | Aerovironment INC | Stock-Industrials | 0.92% | — | — | — |
| 43 | AKAM | Akamai Technologies INC | Stock-Tech | 0.92% | — | — | — |
| 44 | CERS | Cerus CORP | Stock-Other | 0.89% | — | — | — |
| 45 | MTLS | Materialise Nv-adr | Stock-Other | 0.87% | — | — | — |
| 46 | RDFN | Redfin CORP | Stock-Other | 0.82% | — | — | — |
| 47 | BB | Blackberry LTD | Stock-Other | 0.71% | — | — | — |
| 48 | ✓ | Organovo Hldgs INC | Stock-Other | 0.71% | — | — | — |
| 49 | MELI | Mercadolibre INC | Stock-Consumer Disc | 0.64% | — | — | — |
| 50 | NSTGEUR | Nanostring Technologies INC | Stock-Other | 0.56% | — | — | — |
Not enough priced holdings yet to compute performance
Not enough data yet to compute personality scores
Not enough sector-mapped data yet
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2017-09-30 | 2017-11-09 | 13F-HR | View on EDGAR |
Institutions with a similar AUM
CIK 0001512611
Total reported value
$819.2M
108 stks
2026-03-31
AUM within 0.0% of this institution
CIK 0001512601
Total reported value
$819.4M
312 stks
2026-03-31
AUM within 0.0% of this institution
CIK 0001961738
Total reported value
$819.1M
50 stks
2026-03-31
AUM within 0.0% of this institution
Institutions with overlapping top holdings
CIK 0000002230
Total reported value
$2.8B
99 stks
2026-03-31
2 of the top 5 holdings overlap, including Nvidia CORP
CIK 0000003520
Total reported value
$22.8B
525 stks
2026-03-31
2 of the top 5 holdings overlap, including Nvidia CORP
CIK 0000019617
Total reported value
$1.6T
33,063 stks
2026-03-31
2 of the top 5 holdings overlap, including Nvidia CORP