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 | |
|---|---|---|---|---|---|---|
5001
PUT
Yext
YEXT
$552M
| $115K | ﹤0.01% |
12,000
-1,400
| -10% | -$10.8K |
|
|
DNMR
5002
CALL
DELISTED
Danimer Scientific, Inc.
DNMR
| $115K | ﹤0.01% |
840
-2,070
| -71% | -$189K |
|
5003
PUT
Adient
ADNT
$1.72B
| $114K | ﹤0.01% |
2,800
-13,200
| -83% | -$551K |
|
5004
Arbe Robotics
ARBE
$73.6M
| $114K | ﹤0.01% |
36,032
+35,793
| +14,976% | +$144K |
|
5005
Stride
LRN
$3.53B
| $114K | ﹤0.01% |
2,928
-4,250
| -59% | -$167K |
|
5006
PUT
Patterson-UTI
PTEN
$3.74B
| $114K | ﹤0.01% |
9,800
+2,600
| +36% | +$38K |
|
|
TWNK
5007
PUT
DELISTED
Hostess Brands, Inc. Class A Common Stock
TWNK
| $114K | ﹤0.01% |
4,600
+4,200
| +1,050% | +$98.8K |
|
|
BCLI
5008
CALL
DELISTED
BRAINSTORM CELL THERAPUTC
BCLI
| $113K | ﹤0.01% |
2,300
-2,207
| -49% | -$64K |
|
5009
CALL
CNA Financial
CNA
$14.4B
| $113K | ﹤0.01% |
2,900
+1,900
| +190% | +$79.6K |
|
5010
Denison Mines
DNN
$2.64B
| $113K | ﹤0.01% |
103,897
-206,126
| -66% | -$255K |
|
5011
PUT
Patria Investments
PAX
$1.77B
| $113K | ﹤0.01% |
7,700
+5,200
| +208% | +$79.2K |
|
|
PLG
5012
CALL
Platinum Group Metals
PLG
$168M
| $113K | ﹤0.01% |
79,600
+10,500
| +15% | +$15.9K |
|
5013
CALL
Rocket Pharmaceuticals
RCKT
$351M
| $113K | ﹤0.01% |
6,600
-64,900
| -91% | -$1.27M |
|
5014
STAG Industrial
STAG
$7.43B
| $113K | ﹤0.01% |
+3,352
| New | +$114K |
|
5015
PUT
Sterling Infrastructure
STRL
$17.8B
| $113K | ﹤0.01% |
+3,000
| New | +$110K |
|
|
CHMI
5016
CALL
Cherry Hill Mortgage Investment Corp
CHMI
$82.7M
| $112K | ﹤0.01% |
20,300
-28,500
| -58% | -$181K |
|
|
FOLD
5017
PUT
DELISTED
Amicus Therapeutics
FOLD
| $112K | ﹤0.01% |
10,100
+6,700
| +197% | +$82.6K |
|
|
HDSN
5018
CALL
Hudson Technologies
HDSN
$244M
| $112K | ﹤0.01% |
12,900
-12,800
| -50% | -$124K |
|
5019
PUT
Huron Consulting
HURN
$2.61B
| $112K | ﹤0.01% |
+1,400
| New | +$102K |
|
5020
IHS Holding
IHS
$2.76B
| $112K | ﹤0.01% |
12,820
+2,419
| +23% | +$18.1K |
|
|
INN
5021
CALL
Summit Hotel Properties
INN
$748M
| $112K | ﹤0.01% |
16,000
+14,400
| +900% | +$109K |
|
5022
PUT
ProPetro Holding
PUMP
$1.33B
| $112K | ﹤0.01% |
15,700
-4,300
| -22% | -$39K |
|
5023
CALL
SelectQuote
SLQT
$128M
| $112K | ﹤0.01% |
51,700
+31,300
| +153% | +$50.5K |
|
5024
Taboola.com
TBLA
$1.39B
| $112K | ﹤0.01% |
41,344
-7,566
| -15% | -$25.5K |
|
5025
PUT
Viper Energy
VNOM
$8.48B
| $112K | ﹤0.01% |
4,000
-3,100
| -44% | -$93.1K |
|
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.