Data I/o Corp: which funds bought and sold
Institutions that bought and sold Data I/o shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 18 institutions that filed 13F reports for both quarters added to or opened positions in Data I/o, and 8 cut or closed them. Together they added a net 238K shares, +8.3% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 56K shares (+10.6%); index fund managers were net buyers of 74K shares (+15.4%). 9 opened a new position and 2 sold out entirely.
Bought, Q2 2026 18 institutions, 9 of them new holders Sold, Q2 2026 8 institutions, 2 of them sold out
Net change, all compared +238K shares (+8.3%)
Net change, active managers +56K shares (+10.6%), 1 bought, 2 sold
Buyers versus sellers
18 bought 11 8 sold
Active managers and hedge funds 1 bought · 2 sold · +56K
Index fund managers 4 bought · 0 sold · +74K
Other institutions 13 bought · 6 sold · +108K
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Citadel Advisors LLC Hedge fund | +87K New position | 87K | $342,264 |
| Geode Capital Management, LLC Index funds | +28K +32.5% | 115K | $453,420 |
| Vanguard Capital Management LLC Index funds | +24K +8.1% | 324K | $1.3M |
| Thompson Davis & Co., Inc. | +24K New position | 24K | $92,720 |
| Susquehanna International Group, LLP | +22K +80.9% | 49K | $191,279 |
| Jane Street Group, LLC | +18K New position | 18K | $69,844 |
| Kovack Advisors, Inc. | +18K +6.5% | 285K | $1.1M |
| Xtx Topco Ltd | +15K New position | 15K | $60,219 |
| Vanguard Fiduciary Trust Co Index funds | +13K +27.9% | 59K | $231,053 |
| HRT Financial LP | +11K New position | 11K | $44,000 |
| Northern Trust Corp Index funds | +8,351 +62.0% | 22K | $85,998 |
| Citigroup Inc | +7,176 New position | 7,176 | $28,273 |
| Group One Trading LLC | +6,350 +6350.0% | 6,450 | $25,413 |
| UBS Group AG | +3,281 +348.7% | 4,222 | $16,635 |
| Simplex Trading, LLC | +1,520 +55.1% | 4,279 | $16,859 |
| Point Nemo Capital, LLC | +500 New position | 500 | $1,970 |
| Barclays PLC | +50 New position | 50 | $197 |
| Caitong International Asset Management Co., Ltd | +4 New position | 4 | $16 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Citadel Advisors LLC Hedge fund | +87K New position | 87K | $342,264 |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Acadian Asset Management LLC Active manager | −16K −12.5% | 109K | $427,000 |
| Renaissance Technologies LLC Hedge fund | −15K −3.7% | 392K | $1.5M |
| Goldman Sachs Group Inc | −14K Sold out | 0 | — |
| LPL Financial LLC | −1,545 −6.9% | 21K | $82,740 |
| Tower Research Capital LLC (TRC) | −1,367 −81.3% | 314 | $1,237 |
| Penbrook Management LLC | −1,000 −0.3% | 356K | $1.4M |
| Bard Associates Inc | −100 Sold out | 0 | — |
| Essex Investment Management Co LLC | −83 −0.1% | 75K | $293,759 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Acadian Asset Management LLC Active manager | −16K −12.5% | 109K | $427,000 |
| Renaissance Technologies LLC Hedge fund | −15K −3.7% | 392K | $1.5M |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Citadel Advisors LLCHedge fund | 87K | $342,264 |
| Thompson Davis & Co., Inc. | 24K | $92,720 |
| Jane Street Group, LLC | 18K | $69,844 |
| Xtx Topco Ltd | 15K | $60,219 |
| HRT Financial LP | 11K | $44,000 |
| Citigroup Inc | 7,176 | $28,273 |
| Point Nemo Capital, LLC | 500 | $1,970 |
| Barclays PLC | 50 | $197 |
| Caitong International Asset Management Co., Ltd | 4 | $16 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Goldman Sachs Group Inc | 14K | $34,884 |
| Bard Associates Inc | 100 | $253 |
Who holds the shares
- Institutions reporting
- 35
- Ten largest holders
- 87.6% of 13F-reported shares
- Index fund managers
- 17.8% of 13F-reported shares
- Active managers and hedge funds
- 18.9% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 1 | 2 | 1 | 0 | +56K | +10.6% |
| Index fund managers | 4 | 0 | 0 | 0 | +74K | +15.4% |
| Other institutions | 13 | 6 | 8 | 2 | +108K | +5.8% |