Data I/O Corporation
US ˙ NasdaqCM ˙ US2376901029

SecurityDAIO / Data I/O Corporation
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership437,637 shares
Ownership 4.66%
Renaissance Technologies Llc ownership in DAIO / Data I/O Corporation

2026-02-12 - Renaissance Technologies Llc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 437,637 shares of Data I/O Corporation (US:DAIO). This represents 4.66 percent ownership of the company. In their previous filing dated 2024-02-13 , Renaissance Technologies Llc had reported owning 542,643 shares, indicating a decrease of -19.35 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-02-12 2026-02-12 13G/A 542,643 437,637 -19.35 4.66 -22.59
2024-02-13 2024-02-13 13G/A 544,643 542,643 -0.37 6.02 -2.59
2023-02-13 2023-02-13 13G/A 646,243 544,643 -15.72 6.18 -17.60
2022-02-11 2022-02-11 13G/A 701,443 646,243 -7.87 7.50 -9.96
2021-02-11 2021-02-11 13G/A 665,108 701,443 5.46 8.33 2.84
2020-02-13 2020-02-13 13G/A 666,588 665,108 -0.22 8.10 2.53
2019-02-13 2019-02-13 13G/A 658,400 666,588 1.24 7.90 -1.13
2018-02-14 2018-02-14 13G 658,400 7.99

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F DATA I O COM 237690102 407,643 -29,994 -6.85 1,031 -25.67 0.0016
2026-02-12 2025-12-31 13F DATA I O COM 237690102 437,637 -39,197 -8.22 1,387 -12.88 0.0022
2025-11-13 2025-09-30 13F DATA I O COM 237690102 476,834 491 0.10 1,593 7.86 0.0021
2025-08-13 2025-06-30 13F DATA I O COM 237690102 476,343 -3,272 -0.68 1,477 25.62 0.0020
2025-05-14 2025-03-31 13F DATA I O COM 237690102 479,615 -24,028 -4.77 1,175 -15.77 0.0018
2025-02-13 2024-12-31 13F DATA I O COM 237690102 503,643 3,654 0.73 1,395 8.64 0.0021
2024-11-13 2024-09-30 13F DATA I O COM 237690102 499,989 -17,554 -3.39 1,285 -10.08 0.0019
2024-08-09 2024-06-30 13F DATA I O COM 237690102 517,543 -10,055 -1.91 1,428 142,700.00 0.0024
2024-05-13 2024-03-31 13F DATA I O COM 237690102 527,598 -15,045 -2.77 2 0.00 0.0029
2024-02-13 2023-12-31 13F DATA I O COM 237690102 542,643 11,188 2.11 2 -50.00 0.0025
2023-11-14 2023-09-30 13F DATA I O COM 237690102 531,455 6,912 1.32 2 0.00 0.0035
2023-08-11 2023-06-30 13F DATA I O COM 237690102 524,543 500 0.10 2 0.00 0.0032
2023-05-12 2023-03-31 13F DATA I O COM 237690102 524,043 -20,600 -3.78 3 0.00 0.0035
2023-02-13 2022-12-31 13F DATA I O COM 237690102 544,643 -10,800 -1.94 2 -99.87 0.0030
2022-11-14 2022-09-30 13F DATA I O COM 237690102 555,443 -27,900 -4.78 1,550 -13.46 0.0022
2022-08-12 2022-06-30 13F DATA I O COM 237690102 583,343 1,815 0.31 1,791 -27.52 0.0021
2022-05-13 2022-03-31 13F DATA I O COM 237690102 581,528 -64,715 -10.01 2,471 -17.05 0.0029
2022-02-11 2021-12-31 13F DATA I O COM 237690102 646,243 -53,300 -7.62 2,979 -34.79 0.0037
2021-11-12 2021-09-30 13F DATA I O COM 237690102 699,543 36,900 5.57 4,568 1.22 0.0059
2021-08-13 2021-06-30 13F DATA I O COM 237690102 662,643 10,600 1.63 4,513 27.70 0.0056
2021-05-13 2021-03-31 13F DATA I O COM 237690102 652,043 -49,400 -7.04 3,534 22.28 0.0044
2021-02-10 2020-12-31 13F DATA I O COM 237690102 701,443 27,372 4.06 2,890 34.79 0.0031
2020-11-13 2020-09-30 13F DATA I O COM 237690102 674,071 14,808 2.25 2,144 -3.77 0.0021
2020-08-13 2020-06-30 13F DATA I O COM 237690102 659,263 27,394 4.34 2,228 25.45 0.0019
2020-05-14 2020-03-31 13F DATA I O COM 237690102 631,869 -33,239 -5.00 1,776 -37.13 0.0017
2020-02-13 2019-12-31 13F DATA I O COM 237690102 665,108 6,194 0.94 2,825 10.09 0.0022
2019-11-13 2019-09-30 13F DATA I O COM 237690102 658,914 -13,128 -1.95 2,566 -15.15 0.0022
2019-08-12 2019-06-30 13F DATA I O COM 237690102 672,042 -13,846 -2.02 3,024 -20.57 0.0027
2019-05-14 2019-03-31 13F DATA I O COM 237690102 685,888 19,300 2.90 3,807 14.22 0.0035
2019-02-12 2018-12-31 13F DATA I O COM 237690102 666,588 -62,287 -8.55 3,333 -12.57 0.0036
2018-11-13 2018-09-30 13F DATA I O COM 237690102 728,875 59,275 8.85 3,812 -10.35 0.0039
2018-08-13 2018-06-30 13F/A-1 DATA I O COM 237690102 669,600 5,700 0.86 4,252 -13.91 0.0046
2018-08-13 2018-06-30 13F DATA I O COM 237690102 663,900 4,939
2018-05-14 2018-03-31 13F DATA I O COM 237690102 663,900 5,500 0.84 4,939 -37.69 0.0054
2018-02-13 2017-12-31 13F DATA I O COM 237690102 658,400 33,200 5.31 7,927 27.30 0.0087
2017-11-13 2017-09-30 13F DATA I O COM 237690102 625,200 -8,600 -1.36 6,227 23.58 0.0073
2017-08-11 2017-06-30 13F DATA I O COM 237690102 633,800 169,500 36.51 5,039 117.48 0.0064
2017-05-12 2017-03-31 13F DATA I O COM 237690102 464,300 102,700 28.40 2,317 53.34 0.0032
2017-02-13 2016-12-31 13F DATA I O COM 237690102 361,600 32,600 9.91 1,511 30.48 0.0024
2016-11-14 2016-09-30 13F DATA I O COM 237690102 329,000 21,800 7.10 1,158 60.39 0.0020
2016-08-12 2016-06-30 13F DATA I O COM 237690102 307,200 5,300 1.76 722 -8.72 0.0014
2016-05-13 2016-03-31 13F DATA I O COM 237690102 301,900 3,700 1.24 791 5.33 0.0015
2016-02-11 2015-12-31 13F DATA I O COM 237690102 298,200 3,200 1.08 751 9.32 0.0016
2015-11-12 2015-09-30 13F DATA I O COM 237690102 295,000 3,000 1.03 687 -31.23 0.0016
2015-08-14 2015-06-30 13F DATA I O COM 237690102 292,000 7,300 2.56 999 -5.13 0.0023
2015-05-13 2015-03-31 13F DATA I O COM 237690102 284,700 12,100 4.44 1,053 14.33 0.0022
2015-02-13 2014-12-31 13F DATA I O COM 237690102 272,600 9,900 3.77 921 6.60 0.0022
2014-11-12 2014-09-30 13F DATA I O COM 237690102 262,700 7,700 3.02 864 12.50 0.0024
2014-08-13 2014-06-30 13F DATA I O COM 237690102 255,000 9,900 4.04 768 30.61 0.0018
2014-05-14 2014-03-31 13F DATA I O COM 237690102 245,100 7,500 3.16 588 -3.76 0.0014
2014-02-14 2013-12-31 13F DATA I O COM 237690102 237,600 5,600 2.41 611 -13.70 0.0015
2013-11-13 2013-09-30 13F DATA I O COM 237690102 232,000 4,800 2.11 708 39.10 0.0017
2013-08-12 2013-06-30 13F DATA I O COM 237690102 227,200 227,200 509 0.0013
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.