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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4776
CALL
Rigel Pharmaceuticals
RIGL
$723M
| $138K | ﹤0.01% |
10,480
-1,420
| -12% | -$22.6K |
|
4777
ProShares Ultra Technology
ROM
$1.01B
| $138K | ﹤0.01% |
+3,975
| New | +$113K |
|
4778
Sea Limited
SE
$66.4B
| $138K | ﹤0.01% |
1,600
-58,193
| -97% | -$3.97M |
|
|
VRNA
4779
PUT
DELISTED
Verona Pharma
VRNA
| $138K | ﹤0.01% |
6,900
-17,400
| -72% | -$376K |
|
4780
CALL
Wintrust Financial
WTFC
$10.7B
| $138K | ﹤0.01% |
1,900
+1,600
| +533% | +$137K |
|
|
TWOU
4781
CALL
DELISTED
2U Inc
TWOU
| $138K | ﹤0.01% |
673
-1,540
| -70% | -$385K |
|
4782
Celestica
CLS
$37.8B
| $137K | ﹤0.01% |
10,655
+7,302
| +218% | +$93.4K |
|
4783
PUT
Sprinklr
CXM
$1.51B
| $137K | ﹤0.01% |
10,600
+5,300
| +100% | +$53.7K |
|
|
SA
4784
CALL
Seabridge Gold
SA
$2.72B
| $137K | ﹤0.01% |
10,600
-9,000
| -46% | -$111K |
|
4785
PUT
Tanger
SKT
$4.78B
| $137K | ﹤0.01% |
7,000
-99,700
| -93% | -$1.85M |
|
|
INVX
4786
CALL
Innovex International
INVX
$1.8B
| $137K | ﹤0.01% |
4,800
+4,600
| +2,300% | +$136K |
|
|
PRFT
4787
CALL
DELISTED
Perficient Inc
PRFT
| $137K | ﹤0.01% |
1,900
-2,500
| -57% | -$183K |
|
4788
PUT
Fate Therapeutics
FATE
$275M
| $136K | ﹤0.01% |
23,900
+20,100
| +529% | +$121K |
|
4789
PUT
Forestar Group
FOR
$1.48B
| $136K | ﹤0.01% |
8,800
+8,700
| +8,700% | +$130K |
|
4790
CALL
Fortive
FTV
$18B
| $136K | ﹤0.01% |
2,654
-4,512
| -63% | -$227K |
|
4791
PUT
Gildan
GIL
$9.49B
| $136K | ﹤0.01% |
4,100
+4,000
| +4,000% | +$123K |
|
|
LGO
4792
CALL
Largo
LGO
$59.1M
| $136K | ﹤0.01% |
26,400
+16,900
| +178% | +$100K |
|
4793
PUT
SkyWater Technology
SKYT
$1.5B
| $136K | ﹤0.01% |
12,000
-8,800
| -42% | -$98.6K |
|
4794
CALL
Alaunos Therapeutics
TCRT
$4.64M
| $136K | ﹤0.01% |
1,449
-214
| -13% | -$20.4K |
|
|
APPH
4795
PUT
DELISTED
AppHarvest, Inc. Common Stock
APPH
| $136K | ﹤0.01% |
222,500
+80,700
| +57% | +$96.7K |
|
|
CTIC
4796
PUT
DELISTED
CTI BioPharma Corp. (DE) Common Stock
CTIC
| $136K | ﹤0.01% |
32,400
+22,600
| +231% | +$117K |
|
4797
BioXcel Therapeutics
BTAI
$24.8M
| $135K | ﹤0.01% |
455
+297
| +188% | +$127K |
|
4798
PUT
Dynagas LNG Partners
DLNG
$130M
| $135K | ﹤0.01% |
47,800
+40,400
| +546% | +$119K |
|
4799
CALL
Denali Therapeutics
DNLI
$3.79B
| $135K | ﹤0.01% |
5,900
-5,800
| -50% | -$160K |
|
4800
Funko
FNKO
$346M
| $135K | ﹤0.01% |
14,420
-8,930
| -38% | -$92.6K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.