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 | |
|---|---|---|---|---|---|---|
3851
PUT
Agree Realty
ADC
$9.74B
| $295K | ﹤0.01% |
4,300
-700
| -14% | -$50K |
|
|
SOHU
3852
Sohu.com
SOHU
$346M
| $294K | ﹤0.01% |
19,965
+991
| +5% | +$14.9K |
|
|
TPIC
3853
PUT
DELISTED
TPI Composites
TPIC
| $294K | ﹤0.01% |
22,600
+20,000
| +769% | +$255K |
|
3854
CALL
Avnet
AVT
$7.07B
| $293K | ﹤0.01% |
6,500
-36,900
| -85% | -$1.64M |
|
3855
CALL
Eagle Materials
EXP
$6.86B
| $293K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$269K |
|
|
LKFT
3856
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.84B
| $293K | ﹤0.01% |
+7,604
| New | +$313K |
|
3857
CALL
Trimble
TRMB
$13.6B
| $293K | ﹤0.01% |
5,600
-1,400
| -20% | -$74.7K |
|
|
JOAN
3858
PUT
DELISTED
JOANN, Inc. Common Stock
JOAN
| $293K | ﹤0.01% |
184,600
-13,500
| -7% | -$43.4K |
|
3859
CALL
Carlyle Secured Lending
CGBD
$719M
| $292K | ﹤0.01% |
21,500
+4,400
| +26% | +$64.8K |
|
|
DX
3860
CALL
Dynex Capital
DX
$3.07B
| $292K | ﹤0.01% |
24,100
+8,900
| +59% | +$119K |
|
3861
CALL
Essent Group
ESNT
$6.21B
| $292K | ﹤0.01% |
7,300
-5,100
| -41% | -$210K |
|
3862
CALL
Cedar Fair
FUN
$1.91B
| $292K | ﹤0.01% |
6,400
+5,100
| +392% | +$224K |
|
3863
CALL
MKS Inc
MKSI
$19.3B
| $292K | ﹤0.01% |
3,300
-6,200
| -65% | -$592K |
|
3864
PUT
Veru
VERU
$35.8M
| $292K | ﹤0.01% |
25,220
+15,150
| +150% | +$613K |
|
3865
CALL
American Financial Group
AFG
$12B
| $291K | ﹤0.01% |
2,400
+1,300
| +118% | +$171K |
|
|
AKRO
3866
DELISTED
Akero Therapeutics
AKRO
| $291K | ﹤0.01% |
7,614
-18,672
| -71% | -$832K |
|
3867
CALL
Eldorado Gold
EGO
$8.4B
| $291K | ﹤0.01% |
28,100
-220,500
| -89% | -$2.05M |
|
3868
CALL
The Joint Corp
JYNT
$123M
| $291K | ﹤0.01% |
17,300
+4,100
| +31% | +$67.8K |
|
3869
Children's Place
PLCE
$55.8M
| $291K | ﹤0.01% |
7,246
+4,440
| +158% | +$183K |
|
|
SOND
3870
PUT
DELISTED
Sonder
SOND
| $291K | ﹤0.01% |
19,220
-4,220
| -18% | -$97.9K |
|
3871
CALL
FIGS
FIGS
$1.73B
| $290K | ﹤0.01% |
46,900
+18,400
| +65% | +$142K |
|
3872
CALL
Inspired Entertainment
INSE
$188M
| $290K | ﹤0.01% |
+22,700
| New | +$327K |
|
|
MRUS
3873
DELISTED
Merus
MRUS
| $290K | ﹤0.01% |
+15,777
| New | +$275K |
|
|
SEMR
3874
CALL
DELISTED
Semrush
SEMR
| $290K | ﹤0.01% |
28,900
+28,700
| +14,350% | +$253K |
|
3875
CALL
The Greenbrier Companies
GBX
$1.6B
| $289K | ﹤0.01% |
9,000
-9,600
| -52% | -$290K |
|
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.