Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
5001
Rezolute
RZLT
$388M
| $107K | ﹤0.01% |
+35,127
| New | +$105K |
2026 Q1
0 quarters
|
|
5002
CALL
Sundial Growers
SNDL
$305M
| $107K | ﹤0.01% |
81,100
-43,600
| -35% | -$66.6K |
2019 Q4
25 quarters
|
|
5003
PUT
Dyne Therapeutics
DYN
$2.84B
| $107K | ﹤0.01% |
5,900
-3,000
| -34% | -$51.7K |
2025 Q2
3 quarters
|
|
|
IMSR
5004
PUT
Terrestrial Energy
IMSR
$400M
| $107K | ﹤0.01% |
17,800
+9,500
| +114% | +$75.3K |
2025 Q3
2 quarters
|
|
5005
CALL
KNOT Offshore Partners
KNOP
$366M
| $107K | ﹤0.01% |
10,600
-1,300
| -11% | -$13.5K |
2024 Q1
8 quarters
|
|
5006
CALL
East-West Bancorp
EWBC
$17.3B
| $107K | ﹤0.01% |
1,000
-700
| -41% | -$79K |
2017 Q3
34 quarters
|
|
5007
PUT
Ecolab
ECL
$76.7B
| $106K | ﹤0.01% |
400
| – | – |
2018 Q1
32 quarters
|
|
5008
PUT
LXP Industrial Trust
LXP
$3.59B
| $106K | ﹤0.01% |
2,300
-2,900
| -56% | -$142K |
2025 Q3
2 quarters
|
|
5009
Repligen
RGEN
$10.3B
| $106K | ﹤0.01% |
+903
| New | +$126K |
2026 Q1
0 quarters
|
|
|
PRA
5010
PUT
DELISTED
ProAssurance
PRA
| $106K | ﹤0.01% |
4,300
+400
| +10% | +$9.76K |
2025 Q1
4 quarters
|
|
|
IVES
5011
Dan IVES Wedbush AI Revolution ETF
IVES
$1.12B
| $106K | ﹤0.01% |
3,745
-9,917
| -73% | -$306K |
2025 Q3
2 quarters
|
|
5012
CALL
Lazard
LAZ
$3.52B
| $106K | ﹤0.01% |
2,500
-700
| -22% | -$34.2K |
2015 Q1
44 quarters
|
|
|
5013
CALL
Repligen
RGEN
$10.3B
| $106K | ﹤0.01% |
900
| – | – |
2021 Q2
19 quarters
|
|
|
IRD
5014
CALL
Opus Genetics
IRD
$381M
| $106K | ﹤0.01% |
23,300
+17,800
| +324% | +$61.6K |
2025 Q4
1 quarter
|
|
|
AIOT
5015
PUT
PowerFleet Inc
AIOT
$377M
| $106K | ﹤0.01% |
+34,400
| New | +$144K |
2026 Q1
0 quarters
|
|
5016
PUT
StoneCo
STNE
$2.2B
| $106K | ﹤0.01% |
7,500
-124,900
| -94% | -$1.92M |
2019 Q1
28 quarters
|
|
|
TGEN
5017
Tecogen Inc
TGEN
$80M
| $106K | ﹤0.01% |
41,332
-5,199
| -11% | -$19.1K |
2025 Q3
2 quarters
|
|
|
DLLL
5018
GraniteShares 2x Long DELL Daily ETF
DLLL
$230M
| $106K | ﹤0.01% |
+24,112
| New | +$75.1K |
2026 Q1
0 quarters
|
|
|
MNVT
5019
PUT
Moonvest ETF
MNVT
$70.3M
| $106K | ﹤0.01% |
+2,900
| New | +$69.9K |
2026 Q1
0 quarters
|
|
5020
CALL
Peapack-Gladstone Financial
PGC
$790M
| $106K | ﹤0.01% |
3,000
-4,800
| -62% | -$156K |
2025 Q3
2 quarters
|
|
5021
CALL
Tronox
TROX
$628M
| $106K | ﹤0.01% |
10,800
-22,000
| -67% | -$153K |
2021 Q2
19 quarters
|
|
|
FLNA
5022
CALL
Filana Therapeutics
FLNA
$45M
| $105K | ﹤0.01% |
62,400
-40,100
| -39% | -$82.6K |
2021 Q1
20 quarters
|
|
|
IAUI
5023
NEOS Gold High Income ETF
IAUI
$568M
| $105K | ﹤0.01% |
1,851
+188
| +11% | +$11.3K |
2025 Q3
2 quarters
|
|
5024
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.35B
| $105K | ﹤0.01% |
2,400
+700
| +41% | +$38.8K |
2020 Q3
22 quarters
|
|
|
JFIN
5025
CALL
Jiayin Group
JFIN
$68.6M
| $105K | ﹤0.01% |
25,100
+22,400
| +830% | +$141K |
2023 Q2
11 quarters
|
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.