Five9, Inc.
MX ˙ BMV ˙ US3383071012
SecurityMX:FIVN / Five9, Inc.
InstitutionGagnon Securities Llc
Latest Disclosed Ownership622,064 shares
Latest Disclosed Value $ 9,436,711
Gagnon Securities Llc reports 0.59% decrease in ownership of FIVN / Five9, Inc.

On April 21, 2026 - Gagnon Securities Llc filed a 13F-HR form disclosing ownership of 622,064 shares of Five9, Inc. (MX:FIVN) valued at $9,436,711 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 625,726 shares of Five9, Inc.. This represents a change in shares of -0.59% 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)
2026-04-21 2026-03-31 13F FIVE9 COM 338307101 622,064 -3,662 -0.59 9,437 -24.78 2.1783
2026-02-12 2025-12-31 13F FIVE9 COM 338307101 625,726 326,323 108.99 12,546 73.15 2.5547
2025-11-03 2025-09-30 13F FIVE9 COM 338307101 299,403 -108,049 -26.52 7,246 -32.85 1.4535
2025-07-23 2025-06-30 13F FIVE9 COM 338307101 407,452 28,393 7.49 10,789 4.84 2.1914
2025-05-09 2025-03-31 13F FIVE9 COM 338307101 379,059 12,963 3.54 10,291 -30.83 2.2642
2025-01-24 2024-12-31 13F FIVE9 COM 338307101 366,096 34,597 10.44 14,878 56.23 2.9978
2024-11-12 2024-09-30 13F FIVE9 COM 338307101 331,499 77,967 30.75 9,524 -14.82 1.8884
2024-08-14 2024-06-30 13F FIVE9 COM 338307101 253,532 27,159 12.00 11,181 -20.48 2.5183
2024-05-13 2024-03-31 13F FIVE9 COM 338307101 226,373 22,640 11.11 14,060 -12.29 3.3275
2024-02-14 2023-12-31 13F FIVE9 COM 338307101 203,733 -2,052 -1.00 16,032 21.16 3.8484
2023-11-14 2023-09-30 13F FIVE9 COM 338307101 205,785 353 0.17 13,232 -21.88 3.3158
2023-08-08 2023-06-30 13F FIVE9 COM 338307101 205,432 3,009 1.49 16,938 15.75 3.5218
2023-04-10 2023-03-31 13F FIVE9 COM 338307101 202,423 1,885 0.94 14,633 7.53 3.0755
2023-02-07 2022-12-31 13F FIVE9 COM 338307101 200,538 45,742 29.55 13,609 17.24 3.0045
2022-11-14 2022-09-30 13F Five9 COM 338307101 154,796 -1,426 -0.91 11,607 -18.48 2.5520
2022-08-01 2022-06-30 13F Five9 COM 338307101 156,222 3,102 2.03 14,238 -15.77 2.9844
2022-05-09 2022-03-31 13F Five9 COM 338307101 153,120 13,135 9.38 16,904 -12.06 2.7568
2022-02-08 2021-12-31 13F FIVE9 COM 338307101 139,985 7,833 5.93 19,223 -8.94 2.8829
2021-11-12 2021-09-30 13F Five9 COM 338307101 132,152 4,007 3.13 21,110 -10.17 3.1362
2021-07-28 2021-06-30 13F Five9 INC. COM COM 338307101 128,145 -143 -0.11 23,501 17.18 3.3367
2021-05-14 2021-03-31 13F Five9 COM 338307101 128,288 -1,957 -1.50 20,055 -11.71 3.0539
2021-02-12 2020-12-31 13F FIVE9 COM 338307101 130,245 -6,590 -4.82 22,715 28.01 3.6163
2020-11-12 2020-09-30 13F FIVE9 COM 338307101 136,835 -2,076 -1.49 17,745 15.43 3.7838
2020-08-13 2020-06-30 13F FIVE9 COM 338307101 138,911 -9,297 -6.27 15,373 35.66 3.7226
2020-05-11 2020-03-31 13F FIVE9 COM 338307101 148,208 -122,439 -45.24 11,332 -36.15 3.8501
2020-02-14 2019-12-31 13F FIVE9 CL A 338307101 270,647 -12,473 -4.41 17,749 16.65 3.8849
2019-11-08 2019-09-30 13F FIVE9 COM 338307101 283,120 -10,570 -3.60 15,215 1.01 3.6003
2019-08-12 2019-06-30 13F FIVE9 COM 338307101 293,690 -1,928 -0.65 15,063 -3.55 3.2479
2019-05-13 2019-03-31 13F FIVE9 COM 338307101 295,618 12,627 4.46 15,617 26.23 3.4048
2019-01-18 2018-12-31 13F FIVE9 COM 338307101 282,991 -1,567 -0.55 12,372 -0.48 3.2904
2018-11-13 2018-09-30 13F FIVE9 CL A 338307101 284,558 -3,027 -1.05 12,432 25.05 2.8571
2018-08-09 2018-06-30 13F FIVE9 CL A 338307101 287,585 -12,007 -4.01 9,942 11.39 2.8676
2018-05-09 2018-03-31 13F FIVE9 CL A 338307101 299,592 -183,689 -38.01 8,925 -25.77 3.1771
2018-02-13 2017-12-31 13F FIVE9 CL A 338307101 483,281 -38,734 -7.42 12,024 -3.62 4.2668
2017-11-14 2017-09-30 13F/A-1 FIVE9 CL A 338307101 522,015 -19,030 -3.52 12,476 7.15 4.6378
2017-11-14 2017-09-30 13F FIVE9 CL A 338307101 522,015 12,476
2017-07-20 2017-06-30 13F FIVE9 CL A 338307101 541,045 -10,268 -1.86 11,643 28.30 3.2299
2017-05-11 2017-03-31 13F FIVE9 CL A 338307101 551,313 -10,287 -1.83 9,075 13.88 3.9255
2017-02-14 2016-12-31 13F FIVE9 CL A 338307101 561,600 -3,636 -0.64 7,969 -10.09 3.4180
2016-11-14 2016-09-30 13F FIVE9 CL A 338307101 565,236 141,592 33.42 8,863 75.82 3.7715
2016-08-24 2016-06-30 13F/A-1 FIVE9 COM 338307101 423,644 131,959 45.24 5,041 94.41 2.3517
2016-08-10 2016-06-30 13F FIVE9 INC COM COM 338307101 423,644 5,041
2016-05-03 2016-03-31 13F FIVE9 INC COM COM 338307101 291,685 291,685 2,593 1.2414
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.