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 | |
|---|---|---|---|---|---|---|---|
4651
Supernus Pharmaceuticals
SUPN
$2.5B
| $147K | ﹤0.01% |
+2,850
| New | +$145K |
2026 Q1
0 quarters
|
|
4652
Nuvation Bio
NUVB
$1.89B
| $147K | ﹤0.01% |
+34,338
| New | +$191K |
2026 Q1
0 quarters
|
|
4653
Alector
ALEC
$217M
| $147K | ﹤0.01% |
68,477
-13,540
| -17% | -$27.2K |
2025 Q3
2 quarters
|
|
4654
Anavex Life Sciences
AVXL
$164M
| $147K | ﹤0.01% |
+47,867
| New | +$207K |
2026 Q1
0 quarters
|
|
4655
CALL
Palladyne AI
PDYN
$269M
| $147K | ﹤0.01% |
24,200
+2,000
| +9% | +$13.5K |
2025 Q1
4 quarters
|
|
4656
CALL
NCR Voyix
VYX
$944M
| $147K | ﹤0.01% |
23,200
+16,700
| +257% | +$147K |
2014 Q4
45 quarters
|
|
4657
CALL
ONE Gas
OGS
$4.58B
| $146K | ﹤0.01% |
1,700
-100
| -6% | -$8.29K |
2025 Q3
2 quarters
|
|
4658
CALL
Nabors Industries
NBR
$1.19B
| $146K | ﹤0.01% |
1,700
-1,100
| -39% | -$79.8K |
2020 Q2
23 quarters
|
|
4659
ProShares Short VIX Short-Term Futures ETF
SVXY
$260M
| $146K | ﹤0.01% |
3,194
-15,847
| -83% | -$821K |
2025 Q2
3 quarters
|
|
4660
PUT
Hamilton Insurance Group
HG
$3.33B
| $146K | ﹤0.01% |
+4,900
| New | +$141K |
2026 Q1
0 quarters
|
|
|
JBGS
4661
PUT
JBG SMITH
JBGS
$622M
| $146K | ﹤0.01% |
+10,000
| New | +$159K |
2026 Q1
0 quarters
|
|
|
PENG
4662
CALL
Penguin Solutions Inc
PENG
$3.11B
| $146K | ﹤0.01% |
8,300
-29,600
| -78% | -$563K |
2021 Q2
19 quarters
|
|
4663
CALL
GSI Technology
GSIT
$220M
| $146K | ﹤0.01% |
28,400
-600
| -2% | -$4.35K |
2025 Q4
1 quarter
|
|
4664
Cirrus Logic
CRUS
$6.05B
| $146K | ﹤0.01% |
1,007
+797
| +380% | +$107K |
2025 Q3
2 quarters
|
|
4665
PUT
Watsco Inc
WSO
$12.5B
| $146K | ﹤0.01% |
400
-300
| -43% | -$116K |
2025 Q4
1 quarter
|
|
4666
PUT
Allegion
ALLE
$13.2B
| $145K | ﹤0.01% |
+1,000
| New | +$159K |
2026 Q1
0 quarters
|
|
4667
Fomento Económico Mexicano
FMX
$39.1B
| $145K | ﹤0.01% |
+1,306
| New | +$141K |
2026 Q1
0 quarters
|
|
4668
UroGen Pharma
URGN
$1.99B
| $145K | ﹤0.01% |
8,066
-14,043
| -64% | -$282K |
2025 Q4
1 quarter
|
|
4669
CALL
Algonquin Power & Utilities
AQN
$3.96B
| $145K | ﹤0.01% |
23,600
+23,400
| +11,700% | +$152K |
2021 Q1
20 quarters
|
|
|
AIRL
4670
CALL
DELISTED
Themes Airlines ETF
AIRL
| $145K | ﹤0.01% |
13,500
-4,800
| -26% | -$51.5K |
2025 Q2
3 quarters
|
|
4671
YieldMax MSTR Option Income Strategy ETF
MSTY
$1.1B
| $145K | ﹤0.01% |
6,796
-18,957
| -74% | -$486K |
2024 Q2
7 quarters
|
|
4672
PUT
Candel Therapeutics
CADL
$785M
| $145K | ﹤0.01% |
29,500
+22,100
| +299% | +$120K |
2024 Q2
7 quarters
|
|
4673
Innoviz Technologies
INVZ
$108M
| $144K | ﹤0.01% |
228,130
+93,356
| +69% | +$85.3K |
2021 Q2
19 quarters
|
|
4674
CALL
Landstar System
LSTR
$5.88B
| $144K | ﹤0.01% |
+900
| New | +$138K |
2026 Q1
0 quarters
|
|
4675
Pacific Biosciences
PACB
$802M
| $144K | ﹤0.01% |
+109,016
| New | +$195K |
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.