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 | |
|---|---|---|---|---|---|---|
2226
Darden Restaurants
DRI
$22.5B
| $1.46M | ﹤0.01% |
9,390
+4,292
| +84% | +$635K |
|
|
TE
2227
T1 Energy
TE
$1.4B
| $1.45M | ﹤0.01% |
+163,609
| New | +$1.42M |
|
2228
CALL
New Fortress Energy
NFE
$101M
| $1.45M | ﹤0.01% |
49,400
+17,700
| +56% | +$624K |
|
2229
PUT
Medifast
MED
$108M
| $1.45M | ﹤0.01% |
14,000
+12,300
| +724% | +$1.36M |
|
2230
CALL
Nexstar Media Group
NXST
$5.6B
| $1.45M | ﹤0.01% |
8,400
+8,100
| +2,700% | +$1.49M |
|
2231
Protagonist Therapeutics
PTGX
$8.75B
| $1.45M | ﹤0.01% |
+63,059
| New | +$1.06M |
|
2232
Five Below
FIVE
$11.2B
| $1.45M | ﹤0.01% |
7,037
-9,491
| -57% | -$1.87M |
|
|
TRTN
2233
CALL
DELISTED
Triton International Limited
TRTN
| $1.45M | ﹤0.01% |
22,900
+4,800
| +27% | +$326K |
|
2234
CALL
Fomento Económico Mexicano
FMX
$43.3B
| $1.45M | ﹤0.01% |
15,200
-4,600
| -23% | -$402K |
|
2235
CALL
Legend Biotech
LEGN
$4.3B
| $1.45M | ﹤0.01% |
30,000
-8,900
| -23% | -$435K |
|
2236
PUT
Amylyx Pharmaceuticals
AMLX
$2.05B
| $1.44M | ﹤0.01% |
49,200
-8,600
| -15% | -$299K |
|
|
CTRA
2237
PUT
DELISTED
Coterra Energy
CTRA
| $1.44M | ﹤0.01% |
58,800
-27,500
| -32% | -$676K |
|
2238
PUT
Reliance Steel & Aluminium
RS
$20.8B
| $1.44M | ﹤0.01% |
5,600
+5,300
| +1,767% | +$1.25M |
|
|
SILK
2239
CALL
DELISTED
Silk Road Medical, Inc. Common Stock
SILK
| $1.44M | ﹤0.01% |
36,700
+36,100
| +6,017% | +$1.77M |
|
2240
CALL
Everest Group
EG
$15.2B
| $1.43M | ﹤0.01% |
4,000
+1,000
| +33% | +$359K |
|
2241
PUT
Dave & Buster's
PLAY
$343M
| $1.43M | ﹤0.01% |
38,900
-24,100
| -38% | -$961K |
|
2242
PUT
Autoliv
ALV
$8.6B
| $1.43M | ﹤0.01% |
15,300
+12,100
| +378% | +$1.07M |
|
2243
United Therapeutics
UTHR
$26.3B
| $1.43M | ﹤0.01% |
+6,374
| New | +$1.57M |
|
2244
CALL
World Acceptance Corp
WRLD
$950M
| $1.42M | ﹤0.01% |
17,100
+7,900
| +86% | +$689K |
|
2245
PUT
Transmedics
TMDX
$2.5B
| $1.42M | ﹤0.01% |
18,800
+10,800
| +135% | +$747K |
|
2246
iShares MSCI South Korea ETF
EWY
$21.7B
| $1.42M | ﹤0.01% |
23,235
+16,340
| +237% | +$994K |
|
2247
PUT
Shoals Technologies Group
SHLS
$1.58B
| $1.42M | ﹤0.01% |
62,400
+25,300
| +68% | +$624K |
|
2248
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $1.42M | ﹤0.01% |
18,700
+300
| +2% | +$26.5K |
|
2249
CALL
SEI Investments
SEIC
$11.9B
| $1.42M | ﹤0.01% |
24,700
+10,900
| +79% | +$654K |
|
2250
PUT
American Eagle Outfitters
AEO
$2.85B
| $1.42M | ﹤0.01% |
105,700
-107,300
| -50% | -$1.57M |
|
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.