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 | |
|---|---|---|---|---|---|---|
2726
PUT
Arthur J. Gallagher & Co
AJG
$63.7B
| $860K | ﹤0.01% |
4,500
+500
| +13% | +$94.9K |
|
2727
PUT
American Vanguard Corp
AVD
$73.5M
| $859K | ﹤0.01% |
39,300
+13,900
| +55% | +$300K |
|
2728
PUT
Tilray
TLRY
$479M
| $858K | ﹤0.01% |
33,940
-9,260
| -21% | -$264K |
|
2729
PUT
AvalonBay Communities
AVB
$27.1B
| $857K | ﹤0.01% |
5,100
+4,000
| +364% | +$682K |
|
|
SBDS
2730
PUT
DELISTED
Solo Brands Inc
SBDS
| $856K | ﹤0.01% |
2,983
+2,958
| +11,832% | +$569K |
|
2731
PUT
Gerdau
GGB
$9.44B
| $855K | ﹤0.01% |
208,200
+52,716
| +34% | +$236K |
|
|
PPLI
2732
People Inc
PPLI
$3.1B
| $855K | ﹤0.01% |
20,199
+18,347
| +991% | +$786K |
|
2733
CALL
Stride
LRN
$3.69B
| $855K | ﹤0.01% |
21,800
-28,000
| -56% | -$1.1M |
|
2734
Lightspeed Commerce
LSPD
$1.3B
| $855K | ﹤0.01% |
56,358
-20,591
| -27% | -$326K |
|
2735
CALL
AbCellera Biologics
ABCL
$1.62B
| $852K | ﹤0.01% |
113,000
-24,200
| -18% | -$220K |
|
|
NARI
2736
PUT
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $852K | ﹤0.01% |
13,800
+11,500
| +500% | +$690K |
|
2737
CALL
MasTec
MTZ
$26.7B
| $849K | ﹤0.01% |
9,000
-2,300
| -20% | -$219K |
|
|
TE
2738
CALL
T1 Energy
TE
$1.4B
| $848K | ﹤0.01% |
95,500
-96,400
| -50% | -$838K |
|
2739
PUT
ATI
ATI
$27B
| $844K | ﹤0.01% |
21,400
-17,800
| -45% | -$672K |
|
2740
CALL
OGE Energy
OGE
$10.3B
| $843K | ﹤0.01% |
22,400
+10,100
| +82% | +$380K |
|
|
DO
2741
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $843K | ﹤0.01% |
70,056
-338,840
| -83% | -$3.9M |
|
2742
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $842K | ﹤0.01% |
+75,743
| New | +$801K |
|
2743
Teekay Tankers
TNK
$2.63B
| $842K | ﹤0.01% |
19,624
+15,296
| +353% | +$567K |
|
2744
PUT
UMB Financial
UMBF
$10.7B
| $842K | ﹤0.01% |
+14,600
| New | +$1.19M |
|
2745
Western Union
WU
$2.57B
| $842K | ﹤0.01% |
+75,534
| New | +$983K |
|
2746
CALL
Harmony Gold Mining
HMY
$9.92B
| $841K | ﹤0.01% |
205,200
-216,800
| -51% | -$772K |
|
2747
CALL
Helmerich & Payne
HP
$3.53B
| $840K | ﹤0.01% |
23,500
-26,400
| -53% | -$1.14M |
|
2748
CALL
Dorchester Minerals
DMLP
$1.34B
| $839K | ﹤0.01% |
27,700
+1,300
| +5% | +$38.5K |
|
2749
Direxion Daily Regional Banks Bull 3X ETF
DPST
$451M
| $839K | ﹤0.01% |
10,887
+10,535
| +2,993% | +$2.15M |
|
2750
iShares MSCI Taiwan ETF
EWT
$10B
| $838K | ﹤0.01% |
+18,496
| New | +$818K |
|
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.