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 | |
|---|---|---|---|---|---|---|---|
5351
PUT
A2Z Smart Technologies
AZ
$273M
| $79.4K | ﹤0.01% |
+11,900
| New | +$75.9K |
2026 Q1
0 quarters
|
|
|
HIMZ
5352
Defiance Daily Target 2X Long HIMS ETF
HIMZ
$52.7M
| $79.4K | ﹤0.01% |
3,442
+3,224
| +1,479% | +$133K |
2025 Q4
1 quarter
|
|
5353
CALL
Teekay
TK
$1.3B
| $79.4K | ﹤0.01% |
6,500
+3,500
| +117% | +$38.6K |
2020 Q2
23 quarters
|
|
5354
Roundhill S&P 500 0DTE Covered Call Strategy ETF
XDTE
$336M
| $79.1K | ﹤0.01% |
2,155
+1,790
| +490% | +$69.9K |
2025 Q4
1 quarter
|
|
5355
PUT
Jack Henry & Associates
JKHY
$9.99B
| $79K | ﹤0.01% |
500
-6,600
| -93% | -$1.13M |
2025 Q3
2 quarters
|
|
|
BTGO
5356
PUT
BitGo Holdings
BTGO
$867M
| $79K | ﹤0.01% |
+9,600
| New | +$105K |
2026 Q1
0 quarters
|
|
5357
PUT
Alliant Energy
LNT
$16.7B
| $78.9K | ﹤0.01% |
1,100
-100
| -8% | -$6.9K |
2018 Q2
31 quarters
|
|
5358
CALL
GeoPark
GPRK
$704M
| $78.8K | ﹤0.01% |
+8,300
| New | +$69.9K |
2026 Q1
0 quarters
|
|
5359
KRONOS Worldwide
KRO
$895M
| $78.7K | ﹤0.01% |
11,973
+4,921
| +70% | +$27.9K |
2025 Q3
2 quarters
|
|
5360
CALL
Dorian LPG
LPG
$2.45B
| $78.7K | ﹤0.01% |
2,300
-10,600
| -82% | -$336K |
2020 Q2
23 quarters
|
|
|
MSB
5361
Mesabi Trust
MSB
$248M
| $78.2K | ﹤0.01% |
+2,483
| New | +$84.5K |
2026 Q1
0 quarters
|
|
5362
Cheesecake Factory
CAKE
$5.46B
| $78.1K | ﹤0.01% |
1,427
-13,833
| -91% | -$825K |
2025 Q3
2 quarters
|
|
5363
PUT
Turning Point Brands
TPB
$1.12B
| $78.1K | ﹤0.01% |
900
-200
| -18% | -$22.3K |
2024 Q2
7 quarters
|
|
5364
CALL
Vitesse Energy
VTS
$710M
| $78.1K | ﹤0.01% |
4,300
-2,900
| -40% | -$58.4K |
2023 Q2
11 quarters
|
|
|
OMDA
5365
PUT
Omada Health Inc
OMDA
$1.25B
| $77.9K | ﹤0.01% |
6,200
+5,500
| +786% | +$76K |
2025 Q4
1 quarter
|
|
|
CVSA
5366
Covista Inc
CVSA
$4.27B
| $77.9K | ﹤0.01% |
676
+595
| +735% | +$63.5K |
2025 Q2
3 quarters
|
|
5367
CALL
CBIZ
CBZ
$3B
| $77.9K | ﹤0.01% |
2,900
+2,000
| +222% | +$70.5K |
2025 Q3
2 quarters
|
|
|
FINV
5368
FinVolution Group
FINV
$685M
| $77.8K | ﹤0.01% |
+16,251
| New | +$86.2K |
2026 Q1
0 quarters
|
|
5369
CALL
Brixmor Property Group
BRX
$8.41B
| $77.8K | ﹤0.01% |
2,700
+2,300
| +575% | +$64.9K |
2018 Q2
31 quarters
|
|
5370
PUT
Spero Therapeutics
SPRO
$69.3M
| $77.7K | ﹤0.01% |
33,200
+14,800
| +80% | +$35.1K |
2025 Q1
4 quarters
|
|
|
UDMY
5371
DELISTED
Udemy
UDMY
| $77.6K | ﹤0.01% |
16,797
+1,428
| +9% | +$7.04K |
2025 Q4
1 quarter
|
|
5372
CALL
Xometry
XMTR
$5.88B
| $77.6K | ﹤0.01% |
1,900
+500
| +36% | +$26.6K |
2021 Q4
17 quarters
|
|
5373
CALL
C4 Therapeutics
CCCC
$363M
| $77.6K | ﹤0.01% |
29,500
+23,600
| +400% | +$55.6K |
2021 Q4
17 quarters
|
|
5374
CALL
Pinnacle Financial Partners Inc
PNFP
$14.5B
| $77.5K | ﹤0.01% |
+900
| New | +$83.7K |
2026 Q1
0 quarters
|
|
|
RGTZ
5375
Defiance Daily Target 2x Short RGTI ETF
RGTZ
$76.4M
| $77.5K | ﹤0.01% |
+572
| New | +$63.5K |
2026 Q1
0 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.