Onto Innovation Inc.
US ˙ NYSE ˙ US6833441057

SecurityONTO / Onto Innovation Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership27,110 shares
Latest Disclosed Value $ 5,559,448
Citigroup Inc ownership in ONTO / Onto Innovation Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 27,110 shares of Onto Innovation Inc. (US:ONTO) valued at $5,559,448 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 32,165 shares of Onto Innovation Inc.. This represents a change in shares of -15.72% during the quarter. The current value of the position is $7,590,258 USD.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (ONTO) in the form of stock options. The firm currently holds call options representing 19,400 of underlying shares valued at $3,978,358 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

ONTO / Onto Innovation Inc. Historical Put/Call Ratio
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)
2026-05-11 2026-03-31 13F ONTO INNOVATION COM 683344105 27,110 -5,055 -15.72 5,559 9.49 0.0024
2026-02-13 2025-12-31 13F ONTO INNOVATION COM 683344105 32,165 10,009 45.18 5,078 77.39 0.0022
2025-11-10 2025-09-30 13F ONTO INNOVATION COM 683344105 22,156 -264,517 -92.27 2,863 -90.11 0.0013
2025-08-11 2025-06-30 13F ONTO INNOVATION COM 683344105 286,673 52,272 22.30 28,934 1.73 0.0142
2025-05-12 2025-03-31 13F ONTO INNOVATION COM 683344105 234,401 -100,463 -30.00 28,442 -49.04 0.0145
2025-02-12 2024-12-31 13F ONTO INNOVATION COM 683344105 334,864 15,748 4.93 55,812 -15.74 0.0331
2024-11-12 2024-09-30 13F ONTO INNOVATION COM 683344105 319,116 284,115 811.73 66,236 761.99 0.0384
2024-08-12 2024-06-30 13F ONTO INNOVATION COM 683344105 35,001 17,775 103.19 7,685 146.36 0.0049
2024-05-10 2024-03-31 13F ONTO INNOVATION COM 683344105 17,226 -3,969 -18.73 3,119 -3.73 0.0020
2024-02-09 2023-12-31 13F ONTO INNOVATION COM 683344105 21,195 -11,526 -35.23 3,241 -22.34 0.0023
2023-12-06 2023-09-30 13F/A-1 ONTO INNOVATION COM 683344105 32,721 -10,591 -24.45 4,173 -17.29 0.0031
2023-11-09 2023-09-30 13F ONTO INNOVATION COM 683344105 32,721 -10,591 4,173 0.0012
2023-08-10 2023-06-30 13F ONTO INNOVATION COM 683344105 43,312 16,748 63.05 5,045 116.11 0.0033
2023-05-11 2023-03-31 13F ONTO INNOVATION COM 683344105 26,564 -6,265 -19.08 2,334 4.43 0.0016
2023-02-09 2022-12-31 13F ONTO INNOVATION COM 683344105 32,829 -4,616 -12.33 2,235 -6.80 0.0018
2022-11-10 2022-09-30 13F ONTO INNOVATION COM 683344105 37,445 8,983 31.56 2,398 20.81 0.0017
2022-08-10 2022-06-30 13F ONTO INNOVATION COM 683344105 28,462 -23,815 -45.56 1,985 -56.31 0.0015
2022-05-12 2022-03-31 13F ONTO INNOVATION COM 683344105 52,277 2,697 5.44 4,543 -9.48 0.0028
2022-02-10 2021-12-31 13F ONTO INNOVATION COM 683344105 49,580 14,856 42.78 5,019 100.04 0.0027
2021-11-10 2021-09-30 13F ONTO INNOVATION COM 683344105 34,724 512 1.50 2,509 0.40 0.0015
2021-08-10 2021-06-30 13F ONTO INNOVATION COM 683344105 34,212 22,028 180.79 2,499 211.99 0.0015
2021-05-13 2021-03-31 13F ONTO INNOVATION COM 683344105 12,184 -6,374 -34.35 801 -9.18 0.0005
2021-02-11 2020-12-31 13F ONTO INNOVATION COM 683344105 18,558 9,562 106.29 882 229.10 0.0005
2020-11-12 2020-09-30 13F ONTO INNOVATION COM 683344105 8,996 -33,413 -78.79 268 -81.44 0.0002
2020-08-12 2020-06-30 13F ONTO INNOVATION COM 683344105 42,409 20,647 94.88 1,444 123.53 0.0011
2020-05-12 2020-03-31 13F ONTO INNOVATION COM 683344105 21,762 -64,923 -74.90 646 -79.61 0.0006
2020-02-12 2019-12-31 13F ONTO INNOVATION COM 683344105 86,685 76,481 749.52 3,168 851.35 0.0023
2019-11-08 2019-09-30 13F NANOMETRICS COM 630077105 10,204 -4,257 -29.44 333 -33.67 0.0003
2019-08-12 2019-06-30 13F NANOMETRICS COM 630077105 14,461 -4,159 -22.34 502 -12.70 0.0004
2019-05-13 2019-03-31 13F NANOMETRICS COM 630077105 18,620 1,283 7.40 575 21.56 0.0006
2019-02-12 2018-12-31 13F NANOMETRICS COM 630077105 17,337 11,233 184.03 473 106.55 0.0005
2018-11-13 2018-09-30 13F NANOMETRICS COM 630077105 6,104 2,882 89.45 229 100.88 0.0002
2018-08-10 2018-06-30 13F NANOMETRICS COM 630077105 3,222 2,973 1,193.98 114 1,528.57 0.0001
2018-05-11 2018-03-31 13F NANOMETRICS COM 630077105 249 -70 -21.94 7 -12.50 0.0000
2018-02-12 2017-12-31 13F NANOMETRICS COM 630077105 319 -26,977 -98.83 8 -98.98 0.0000
2017-11-13 2017-09-30 13F NANOMETRICS COM 630077105 27,296 -26 -0.10 786 13.75 0.0006
2017-08-11 2017-06-30 13F NANOMETRICS COM 630077105 27,322 4,865 21.66 691 1.02 0.0006
2017-05-12 2017-03-31 13F NANOMETRICS COM 630077105 22,457 -37,011 -62.24 684 -54.09 0.0006
2017-02-10 2016-12-31 13F NANOMETRICS COM 630077105 59,468 36,511 159.04 1,490 190.45 0.0013
2016-11-10 2016-09-30 13F NANOMETRICS COM 630077105 22,957 9,236 67.31 513 80.00 0.0005
2016-08-12 2016-06-30 13F NANOMETRICS COM 630077105 13,721 -8,075 -37.05 285 -17.39 0.0003
2016-05-13 2016-03-31 13F NANOMETRICS COM 630077105 21,796 11,256 106.79 345 115.63 0.0004
2016-02-12 2015-12-31 13F NANOMETRICS COM 630077105 10,540 5,641 115.15 160 166.67 0.0002
2015-11-13 2015-09-30 13F NANOMETRICS COM 630077105 4,899 -55 -1.11 60 -25.00 0.0001
2015-08-13 2015-06-30 13F NANOMETRICS COM 630077105 4,954 -1,533 -23.63 80 -26.61 0.0001
2015-05-14 2015-03-31 13F NANOMETRICS COM 630077105 6,487 -7,836 -54.71 109 -54.77 0.0001
2015-02-17 2014-12-31 13F NANOMETRICS COM 630077105 14,323 10,316 257.45 241 301.67 0.0002
2014-11-14 2014-09-30 13F NANOMETRICS COM 630077105 4,007 655 19.54 60 -1.64 0.0001
2014-08-14 2014-06-30 13F NANOMETRICS COM 630077105 3,352 -3,361 -50.07 61 -49.59 0.0001
2014-05-15 2014-03-31 13F NANOMETRICS COM 630077105 6,713 -3,064 -31.34 121 -34.95 0.0001
2014-02-14 2013-12-31 13F NANOMETRICS COM 630077105 9,777 5,028 105.87 186 141.56 0.0002
2013-11-14 2013-09-30 13F NANOMETRICS COM 630077105 4,749 -2,172 -31.38 77 -23.76 0.0001
2013-08-14 2013-06-30 13F NANOMETRICS COM 630077105 6,921 6,921 101 0.0001
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-11 2026-03-31 13F ONTO INNOVATION COM Call 19,400 3,978 n/a n/a n/a
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.