Onto Innovation Inc.
US ˙ NYSE ˙ US6833441057

SecurityONTO / Onto Innovation Inc.
InstitutionFirst Manhattan Co
Latest Disclosed Ownership20,751 shares
Latest Disclosed Value $ 4,255,408
First Manhattan Co reports 9.85% decrease in ownership of ONTO / Onto Innovation Inc.

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 20,751 shares of Onto Innovation Inc. (US:ONTO) valued at $4,255,408 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 23,018 shares of Onto Innovation Inc.. This represents a change in shares of -9.85% during the quarter. The current value of the position is $5,809,865 USD.

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)
2026-05-15 2026-03-31 13F ONTO INNOVATION COM 683344105 20,751 -2,267 -9.85 4,255 17.12 0.0118
2026-02-17 2025-12-31 13F ONTO INNOVATION COM 683344105 23,018 -835 -3.50 3,634 17.88 0.0095
2025-11-14 2025-09-30 13F ONTO INNOVATION COM 683344105 23,853 -700 -2.85 3,082 24.37 0.0081
2025-08-14 2025-06-30 13F ONTO INNOVATION COM 683344105 24,553 -1,946 -7.34 2,478 -22.92 0.0070
2025-05-15 2025-03-31 13F ONTO INNOVATION COM 683344105 26,499 -4,203 -13.69 3,215 -37.17 0.0094
2025-02-14 2024-12-31 13F ONTO INNOVATION COM 683344105 30,702 -136 -0.44 5,117 -20.05 0.0150
2024-11-14 2024-09-30 13F ONTO INNOVATION COM 683344105 30,838 -255 -0.82 6,401 -6.24 0.0190
2024-08-15 2024-06-30 13F/A-1 ONTO INNOVATION COM 683344105 31,093 -744 -2.34 6,827 18.40 0.0219
2024-08-14 2024-06-30 13F ONTO INNOVATION COM 683344105 31,093 -744 6,827 0.0219
2024-05-15 2024-03-31 13F ONTO INNOVATION COM 683344105 31,837 -5,070 -13.74 5,765 2.16 0.0187
2024-02-13 2023-12-31 13F ONTO INNOVATION COM 683344105 36,907 7 0.02 5,643 19.94 0.0196
2023-11-14 2023-09-30 13F ONTO INNOVATION COM 683344105 36,900 -950 -2.51 4,705 6.74 0.0174
2023-08-14 2023-06-30 13F ONTO INNOVATION COM 683344105 37,850 -26,425 -41.11 4,408 -21.95 0.0161
2023-05-15 2023-03-31 13F ONTO INNOVATION COM 683344105 64,275 -1,500 -2.28 5,648 26.13 0.0217
2023-02-14 2022-12-31 13F ONTO INNOVATION COM 683344105 65,775 -275 -0.42 4,479 5.86 0.0164
2022-11-14 2022-09-30 13F ONTO INNOVATION COM 683344105 66,050 -5,200 -7.30 4,230 -14.86 0.0179
2022-08-15 2022-06-30 13F ONTO INNOVATION COM 683344105 71,250 -130 -0.18 4,968 -19.90 0.0200
2022-05-16 2022-03-31 13F ONTO INNOVATION COM 683344105 71,380 0 0.00 6,202 -14.16 0.0203
2022-02-14 2021-12-31 13F ONTO INNOVATION COM 683344105 71,380 -138 -0.19 7,225 39.83 0.0238
2021-11-15 2021-09-30 13F ONTO INNOVATION COM 683344105 71,518 -182 -0.25 5,167 -1.32 0.0190
2021-08-16 2021-06-30 13F ONTO INNOVATION COM 683344105 71,700 0 0.00 5,236 11.14 0.0191
2021-05-14 2021-03-31 13F ONTO INNOVATION COM 683344105 71,700 -200 -0.28 4,711 37.83 0.0203
2021-02-16 2020-12-31 13F ONTO INNOVATION COM 683344105 71,900 0 0.00 3,418 59.65 0.0164
2020-11-12 2020-09-30 13F ONTO INNOVATION COM USD0.001 683344105 71,900 0 0.00 2,141 -12.51 0.0110
2020-08-14 2020-06-30 13F ONTO INNOVATION COM USD0.001 683344105 71,900 -200 -0.28 2,447 14.40 0.0141
2020-05-06 2020-03-31 13F ONTO INNOVATION COM USD0.001 683344105 72,100 0 0.00 2,139 -18.79 0.0139
2020-02-13 2019-12-31 13F ONTO INNOVATION COM USD0.001 683344105 72,100 -3,100 -4.12 2,634 7.38 0.0132
2019-11-13 2019-09-30 13F NANOMETRICS COMMON 630077105 75,200 -450 -0.59 2,453 -6.55 0.0135
2019-08-16 2019-06-30 13F NANOMETRICS COMMON 630077105 75,650 -2,300 -2.95 2,625 9.06 0.0146
2019-04-12 2019-03-31 13F NANOMETRICS COMMON 630077105 77,950 0 0.00 2,407 13.00 0.0139
2019-01-30 2018-12-31 13F NANOMETRICS COMMON 630077105 77,950 -100 -0.13 2,130 -27.25 0.0133
2018-10-15 2018-09-30 13F NANOMETRICS COMMON 630077105 78,050 -600 -0.76 2,928 5.17 0.0156
2018-08-01 2018-06-30 13F NANOMETRICS COMMON 630077105 78,650 0 0.00 2,784 31.63 0.0161
2018-04-20 2018-03-31 13F NANOMETRICS COMMON 630077105 78,650 0 0.00 2,115 7.96 0.0120
2018-01-22 2017-12-31 13F NANOMETRICS COMMON 630077105 78,650 -600 -0.76 1,959 -14.15 0.0107
2017-10-25 2017-09-30 13F NANOMETRICS COMMON 630077105 79,250 -150 -0.19 2,282 13.65 0.0131
2017-08-10 2017-06-30 13F/A-2 NANOMETRICS COMMON 630077105 79,400 0 0.00 2,008 -16.96 0.0117
2017-08-01 2017-06-30 13F/A-1 NANOMETRICS COMMON 630077105 79,400 0 2,008 0.0117
2017-07-28 2017-06-30 13F NANOMETRICS COMMON 630077105 79,400 0 2,008
2017-04-25 2017-03-31 13F/A-1 NANOMETRICS COMMON 630077105 79,400 0 0.00 2,418 21.57 0.0144
2017-04-24 2017-03-31 13F NANOMETRICS COMMON 630077105 80,400 1,796
2017-01-25 2016-12-31 13F NANOMETRICS COMMON 630077105 79,400 -1,000 -1.24 1,989 10.75 0.0121
2016-10-20 2016-09-30 13F NANOMETRICS COMMON 630077105 80,400 -300 -0.37 1,796 7.10 0.0110
2016-07-14 2016-06-30 13F NANOMETRICS COMMON 630077105 80,700 -2,500 -3.00 1,677 27.33 0.0103
2016-04-22 2016-03-31 13F NANOMETRICS COMMON 630077105 83,200 -1,200 -1.42 1,317 3.13 0.0081
2016-01-20 2015-12-31 13F NANOMETRICS COMMON 630077105 84,400 0 0.00 1,277 24.71 0.0078
2015-10-26 2015-09-30 13F NANOMETRICS COMMON 630077105 84,400 -600 -0.71 1,024 -25.26 0.0066
2015-07-17 2015-06-30 13F NANOMETRICS COMMON 630077105 85,000 -2,000 -2.30 1,370 -6.36 0.0081
2015-04-30 2015-03-31 13F NANOMETRICS COMMON 630077105 87,000 -3,500 -3.87 1,463 -3.88 0.0084
2015-01-20 2014-12-31 13F NANOMETRICS COMMON 630077105 90,500 0 0.00 1,522 11.42 0.0086
2014-10-23 2014-09-30 13F NANOMETRICS COMMON 630077105 90,500 0 0.00 1,366 -17.26 0.0079
2014-08-14 2014-06-30 13F/A-1 NANOMETRICS COMMON 630077105 90,500 0 0.00 1,651 1.54 0.0105
2014-05-16 2014-03-31 13F NANOMETRICS COMMON 630077105 90,500 -5,500 -5.73 1,626 -11.05 0.0107
2014-02-04 2013-12-31 13F NANOMETRICS COMMON 630077105 96,000 -400 -0.41 1,828 17.71 0.0121
2013-10-29 2013-09-30 13F NANOMETRICS COMMON 630077105 96,400 5,300 5.82 1,553 11.25 0.0108
2013-08-13 2013-06-30 13F NANOMETRICS COMMON 630077105 91,100 91,100 1,396 0.0096
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.