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 | |
|---|---|---|---|---|---|---|---|
|
PONY
4251
Pony AI Inc
PONY
$2.71B
| $208K | ﹤0.01% |
22,049
-63,959
| -74% | -$881K |
2025 Q4
1 quarter
|
|
4252
PUT
Larimar Therapeutics
LRMR
$318M
| $208K | ﹤0.01% |
46,200
+44,600
| +2,788% | +$178K |
2024 Q1
8 quarters
|
|
4253
Compass Diversified
CODI
$828M
| $207K | ﹤0.01% |
+26,375
| New | +$168K |
2026 Q1
0 quarters
|
|
4254
PUT
Shoals Technologies Group
SHLS
$1.37B
| $207K | ﹤0.01% |
+31,500
| New | +$258K |
2026 Q1
0 quarters
|
|
4255
PUT
SiTime
SITM
$20.4B
| $207K | ﹤0.01% |
600
+400
| +200% | +$147K |
2021 Q4
17 quarters
|
|
|
PSIX
4256
PUT
Power Solutions International
PSIX
$1.05B
| $207K | ﹤0.01% |
3,400
-4,700
| -58% | -$335K |
2025 Q3
2 quarters
|
|
4257
YieldMax COIN Option Income Strategy ETF
CONY
$379M
| $207K | ﹤0.01% |
7,858
+6,984
| +799% | +$222K |
2025 Q2
3 quarters
|
|
4258
Broadridge
BR
$18.2B
| $207K | ﹤0.01% |
+1,273
| New | +$242K |
2026 Q1
0 quarters
|
|
4259
Compañía de Minas Buenaventura
BVN
$8B
| $207K | ﹤0.01% |
+5,739
| New | +$207K |
2026 Q1
0 quarters
|
|
|
OS
4260
CALL
DELISTED
OneStream Inc
OS
| $206K | ﹤0.01% |
8,600
-25,400
| -75% | -$596K |
2024 Q3
6 quarters
|
|
4261
AAR Corp
AIR
$4.02B
| $206K | ﹤0.01% |
1,885
+635
| +51% | +$68.3K |
2025 Q2
3 quarters
|
|
4262
CALL
Green Brick Partners
GRBK
$2.86B
| $206K | ﹤0.01% |
3,200
-2,900
| -48% | -$204K |
2020 Q2
23 quarters
|
|
4263
CALL
Lexicon Pharmaceuticals
LXRX
$810M
| $206K | ﹤0.01% |
132,200
+47,300
| +56% | +$68.8K |
2021 Q2
19 quarters
|
|
4264
CALL
Apple Hospitality REIT
APLE
$3.86B
| $206K | ﹤0.01% |
17,900
+3,800
| +27% | +$45.9K |
2018 Q2
31 quarters
|
|
4265
CALL
CrossAmerica Partners
CAPL
$821M
| $206K | ﹤0.01% |
9,900
+700
| +8% | +$15.2K |
2019 Q4
25 quarters
|
|
4266
PUT
Sonoco
SON
$4.8B
| $206K | ﹤0.01% |
3,800
-1,700
| -31% | -$87.6K |
2019 Q3
26 quarters
|
|
4267
CALL
Impinj
PI
$5.62B
| $205K | ﹤0.01% |
2,000
+1,500
| +300% | +$200K |
2016 Q4
37 quarters
|
|
4268
Tractor Supply
TSCO
$16.5B
| $205K | ﹤0.01% |
+4,529
| New | +$231K |
2026 Q1
0 quarters
|
|
4269
Roundhill Generative AI & Technology ETF
CHAT
$1.92B
| $205K | ﹤0.01% |
3,312
-74,390
| -96% | -$4.66M |
2025 Q3
2 quarters
|
|
4270
CALL
Evergy
EVRG
$18.2B
| $205K | ﹤0.01% |
2,500
-6,800
| -73% | -$537K |
2019 Q1
28 quarters
|
|
4271
Thryv Holdings
THRY
$69.8M
| $205K | ﹤0.01% |
74,645
-1,851
| -2% | -$7.27K |
2024 Q2
7 quarters
|
|
4272
PUT
Copa Holdings
CPA
$5.41B
| $204K | ﹤0.01% |
1,800
-19,300
| -91% | -$2.53M |
2023 Q1
12 quarters
|
|
4273
PUT
Curtiss-Wright
CW
$20.1B
| $204K | ﹤0.01% |
300
-300
| -50% | -$200K |
2025 Q4
1 quarter
|
|
4274
Paylocity
PCTY
$7.78B
| $204K | ﹤0.01% |
1,891
+1,580
| +508% | +$194K |
2025 Q4
1 quarter
|
|
4275
HUB Group
HUBG
$1.84B
| $204K | ﹤0.01% |
5,667
+5,009
| +761% | +$212K |
2025 Q2
3 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.