Five9, Inc.
MX ˙ BMV ˙ US3383071012
SecurityMX:FIVN / Five9, Inc.
InstitutionTwo Sigma Advisers, Lp
Latest Disclosed Ownership248,100 shares
Latest Disclosed Value $ 4,974,405
Two Sigma Advisers, Lp reports 265.93% increase in ownership of FIVN / Five9, Inc.

On February 17, 2026 - Two Sigma Advisers, Lp filed a 13F-HR form disclosing ownership of 248,100 shares of Five9, Inc. (MX:FIVN) valued at $4,974,405 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 67,800 shares of Five9, Inc.. This represents a change in shares of 265.93% during the quarter.

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)
2026-02-17 2025-12-31 13F FIVE9 COM 338307101 248,100 180,300 265.93 4,974 203.29 0.0097
2025-11-14 2025-09-30 13F FIVE9 COM 338307101 67,800 67,800 1,641 0.0033
2025-08-14 2025-06-30 13F FIVE9 COM 338307101 0 -111,745 -100.00 0 -100.00
2025-05-15 2025-03-31 13F FIVE9 COM 338307101 111,745 -5,355 -4.57 3,034 -36.25 0.0068
2025-02-14 2024-12-31 13F FIVE9 COM 338307101 117,100 46,500 65.86 4,759 134.62 0.0110
2024-11-14 2024-09-30 13F FIVE9 COM 338307101 70,600 70,600 2,028 0.0048
2022-02-14 2021-12-31 13F FIVE9 COM 338307101 0 -34,200 -100.00 0 -100.00
2021-11-15 2021-09-30 13F FIVE9 COM 338307101 34,200 34,200 5,463 0.0142
2021-08-16 2021-06-30 13F FIVE9 COM 338307101 0 -1,500 -100.00 0 -100.00
2021-05-17 2021-03-31 13F FIVE9 COM 338307101 1,500 1,500 234 0.0006
2021-02-16 2020-12-31 13F FIVE9 COM 338307101 0 -2,200 -100.00 0 -100.00
2020-11-16 2020-09-30 13F FIVE9 COM 338307101 2,200 2,200 285 0.0008
2020-09-15 2020-06-30 13F/A-1 FIVE9 COM 338307101 0 -18,300 -100.00 0 -100.00
2020-05-15 2020-03-31 13F FIVE9 COM 338307101 18,300 -24,968 -57.71 1,399 -50.70 0.0054
2020-02-14 2019-12-31 13F FIVE9 COM 338307101 43,268 -24,400 -36.06 2,838 -21.95 0.0066
2019-11-14 2019-09-30 13F FIVE9 COM 338307101 67,668 -169,722 -71.50 3,636 -70.14 0.0089
2019-08-14 2019-06-30 13F FIVE9 COM 338307101 237,390 -74,557 -23.90 12,176 -26.12 0.0303
2019-05-15 2019-03-31 13F FIVE9 COM 338307101 311,947 -92,900 -22.95 16,480 -6.89 0.0416
2019-02-14 2018-12-31 13F FIVE9 COM 338307101 404,847 -90,300 -18.24 17,700 -18.18 0.0483
2018-11-14 2018-09-30 13F FIVE9 COM 338307101 495,147 37,300 8.15 21,633 36.68 0.0528
2018-08-14 2018-06-30 13F FIVE9 COM 338307101 457,847 -44,100 -8.79 15,828 5.85 0.0426
2018-05-15 2018-03-31 13F FIVE9 COM 338307101 501,947 39,675 8.58 14,953 30.01 0.0405
2018-02-14 2017-12-31 13F FIVE9 COM 338307101 462,272 -19,813 -4.11 11,501 -0.18 0.0310
2017-11-14 2017-09-30 13F FIVE9 COM 338307101 482,085 1,638 0.34 11,522 11.44 0.0327
2017-08-14 2017-06-30 13F FIVE9 COM 338307101 480,447 21,000 4.57 10,339 36.72 0.0341
2017-05-15 2017-03-31 13F FIVE9 COM 338307101 459,447 125,758 37.69 7,562 59.70 0.0248
2017-02-14 2016-12-31 13F FIVE9 COM 338307101 333,689 -51,611 -13.40 4,735 -21.63 0.0181
2016-11-14 2016-09-30 13F FIVE9 COM 338307101 385,300 342,000 789.84 6,042 1,073.20 0.0257
2016-08-15 2016-06-30 13F FIVE9 COM 338307101 43,300 4,800 12.47 515 50.58 0.0026
2016-05-16 2016-03-31 13F FIVE9 COM 338307101 38,500 13,200 52.17 342 55.45 0.0019
2016-02-16 2015-12-31 13F FIVE9 COM 338307101 25,300 25,300 0.00 220 0.0013
2015-11-16 2015-09-30 13F FIVE9 COMMON STOCK 338307101 0 -24,901 -100.00 0 -100.00
2016-02-09 2015-06-30 13F/A-1 FIVE9 COMMON STOCK 338307101 24,901 -4,599 -15.59 130 -20.73 0.0010
2015-08-14 2015-06-30 13F FIVE9 COMMON STOCK 338307101 24,401 129
2016-02-09 2015-03-31 13F/A-1 FIVE9 COM 338307101 29,500 29,500 164 0.0013
2015-05-15 2015-03-31 13F FIVE9 COM 338307101 27,600 154 0.0012
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.