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 | |
|---|---|---|---|---|---|---|
5901
PUT
StoneX
SNEX
$9.26B
| $51K | ﹤0.01% |
2,531
| – | – |
|
5902
PUT
System1
SST
$14.3M
| $51K | ﹤0.01% |
1,190
-5,850
| -83% | -$259K |
|
|
TEF
5903
PUT
DELISTED
Telefonica
TEF
| $51K | ﹤0.01% |
+12,000
| New | +$47.6K |
|
|
IRD
5904
Opus Genetics
IRD
$306M
| $51K | ﹤0.01% |
13,776
+2,140
| +18% | +$7.68K |
|
|
ABCM
5905
PUT
DELISTED
Abcam PLC
ABCM
| $51K | ﹤0.01% |
+3,800
| New | +$56.7K |
|
|
VCSA
5906
DELISTED
Vacasa, Inc. Class A Common Stock
VCSA
| $51K | ﹤0.01% |
2,674
+796
| +42% | +$22.3K |
|
|
GLOP
5907
DELISTED
GASLOG PARTNERS LP
GLOP
| $51K | ﹤0.01% |
6,060
-140,592
| -96% | -$1.13M |
|
5908
CALL
ProFrac Holding
ACDC
$731M
| $50K | ﹤0.01% |
4,000
+3,500
| +700% | +$68.1K |
|
5909
Arqit Quantum
ARQQ
$298M
| $50K | ﹤0.01% |
1,454
+1,011
| +228% | +$47.8K |
|
5910
Buckle
BKE
$2.25B
| $50K | ﹤0.01% |
+1,408
| New | +$57.7K |
|
5911
CALL
Beazer Homes USA
BZH
$877M
| $50K | ﹤0.01% |
3,200
-10,100
| -76% | -$150K |
|
5912
CALL
Curis
CRIS
$9.78M
| $50K | ﹤0.01% |
210
+34
| +19% | +$8.96K |
|
5913
CALL
Carter's
CRI
$1.42B
| $50K | ﹤0.01% |
700
-1,400
| -67% | -$107K |
|
5914
GrafTech
EAF
$175M
| $50K | ﹤0.01% |
1,032
+845
| +452% | +$45.7K |
|
5915
CALL
Excelerate Energy
EE
$1.25B
| $50K | ﹤0.01% |
2,300
+300
| +15% | +$6.67K |
|
5916
PUT
Evolus
EOLS
$385M
| $50K | ﹤0.01% |
6,000
+5,300
| +757% | +$47.9K |
|
5917
PUT
HighPeak Energy
HPK
$903M
| $50K | ﹤0.01% |
2,200
-14,600
| -87% | -$372K |
|
5918
PUT
International Seaways
INSW
$4.76B
| $50K | ﹤0.01% |
1,200
-7,200
| -86% | -$305K |
|
5919
LSI Industries
LYTS
$859M
| $50K | ﹤0.01% |
3,606
+729
| +25% | +$10.1K |
|
5920
Maximus
MMS
$3.17B
| $50K | ﹤0.01% |
+636
| New | +$49K |
|
5921
PUT
Nexa Resources
NEXA
$1.7B
| $50K | ﹤0.01% |
8,100
+7,900
| +3,950% | +$51.1K |
|
|
NOVA
5922
DELISTED
Sunnova Energy
NOVA
| $50K | ﹤0.01% |
+3,260
| New | +$56.9K |
|
5923
CALL
Option Care Health
OPCH
$3.45B
| $50K | ﹤0.01% |
1,600
-8,200
| -84% | -$246K |
|
5924
CALL
PJT Partners
PJT
$4.3B
| $50K | ﹤0.01% |
+700
| New | +$53.7K |
|
5925
Invesco Energy Exploration & Production ETF
PXE
$89.6M
| $50K | ﹤0.01% |
1,884
+1,394
| +284% | +$39.8K |
|
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.