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 | |
|---|---|---|---|---|---|---|
|
WW
3151
CALL
DELISTED
WW International
WW
| $556K | ﹤0.01% |
135,000
+94,300
| +232% | +$412K |
|
|
SLGC
3152
PUT
DELISTED
SomaLogic, Inc. Class A Common Stock
SLGC
| $556K | ﹤0.01% |
218,300
+87,800
| +67% | +$252K |
|
3153
PUT
CNX Resources
CNX
$4.81B
| $555K | ﹤0.01% |
34,700
-11,700
| -25% | -$186K |
|
3154
Lindblad Expeditions
LIND
$1.8B
| $555K | ﹤0.01% |
58,072
+50,937
| +714% | +$512K |
|
3155
Equifax
EFX
$21.1B
| $554K | ﹤0.01% |
2,734
+1,790
| +190% | +$373K |
|
|
PMT
3156
CALL
PennyMac Mortgage Investment
PMT
$846M
| $554K | ﹤0.01% |
45,000
-4,400
| -9% | -$59.2K |
|
3157
PUT
Varonis Systems
VRNS
$5.33B
| $554K | ﹤0.01% |
21,300
+10,200
| +92% | +$266K |
|
3158
Open Text
OTEX
$5.76B
| $553K | ﹤0.01% |
14,350
+2,830
| +25% | +$97.8K |
|
3159
Cemex
CX
$17.5B
| $551K | ﹤0.01% |
+99,668
| New | +$507K |
|
3160
PUT
Lemonade
LMND
$4.8B
| $551K | ﹤0.01% |
38,700
-103,000
| -73% | -$1.57M |
|
3161
CALL
Oceaneering
OII
$5.15B
| $551K | ﹤0.01% |
31,300
+27,300
| +683% | +$526K |
|
3162
PUT
Par Pacific Holdings
PARR
$3.9B
| $551K | ﹤0.01% |
18,900
+17,800
| +1,618% | +$476K |
|
3163
CALL
Texas Roadhouse
TXRH
$13.2B
| $551K | ﹤0.01% |
5,100
-13,200
| -72% | -$1.35M |
|
|
BCYC
3164
Bicycle Therapeutics
BCYC
$280M
| $550K | ﹤0.01% |
25,888
+11,554
| +81% | +$290K |
|
3165
Banco Bradesco
BBD
$38.4B
| $549K | ﹤0.01% |
209,691
+70,394
| +51% | +$187K |
|
3166
PUT
WillScot Mobile Mini Holdings
WSC
$4.8B
| $548K | ﹤0.01% |
11,700
-85,900
| -88% | -$4.13M |
|
|
BIOR
3167
CALL
DELISTED
Biora Therapeutics, Inc. Common Stock
BIOR
| $548K | ﹤0.01% |
19,790
+18,326
| +1,252% | +$621K |
|
3168
CALL
Danaos Corp
DAC
$2.53B
| $546K | ﹤0.01% |
10,000
-9,100
| -48% | -$516K |
|
3169
Alaska Air
ALK
$5.24B
| $545K | ﹤0.01% |
+13,008
| New | +$610K |
|
3170
Amplify Cybersecurity ETF
HACK
$2.65B
| $545K | ﹤0.01% |
11,417
+9,003
| +373% | +$412K |
|
|
SPR
3171
PUT
DELISTED
Spirit AeroSystems
SPR
| $545K | ﹤0.01% |
15,800
-123,000
| -89% | -$4.13M |
|
3172
Global X Lithium & Battery Tech ETF
LIT
$1.49B
| $544K | ﹤0.01% |
8,574
-27,886
| -76% | -$1.8M |
|
3173
CALL
Pembina Pipeline
PBA
$29.1B
| $544K | ﹤0.01% |
16,800
-5,000
| -23% | -$169K |
|
3174
PUT
Rayonier Advanced Materials
RYAM
$556M
| $543K | ﹤0.01% |
86,700
+84,100
| +3,235% | +$587K |
|
|
DNB
3175
CALL
DELISTED
Dun & Bradstreet
DNB
| $542K | ﹤0.01% |
46,200
| – | – |
|
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.