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 | |
|---|---|---|---|---|---|---|
|
MRSH
2576
PUT
Marsh
MRSH
$86.3B
| $1.01M | ﹤0.01% |
6,100
+4,400
| +259% | +$733K |
|
2577
FirstEnergy
FE
$28.9B
| $1.01M | ﹤0.01% |
25,301
+17,849
| +240% | +$721K |
|
2578
CALL
Constellation Energy
CEG
$98B
| $1.01M | ﹤0.01% |
12,900
-19,200
| -60% | -$1.55M |
|
2579
CALL
G-III Apparel Group
GIII
$1.47B
| $1.01M | ﹤0.01% |
65,100
+46,800
| +256% | +$733K |
|
|
RXDX
2580
PUT
DELISTED
Prometheus Biosciences, Inc. Common Stock
RXDX
| $1.01M | ﹤0.01% |
9,400
-62,700
| -87% | -$7.22M |
|
|
RAM
2581
DELISTED
Aries I Acquisition Corporation Class A Ordinary Share
RAM
| $1.01M | ﹤0.01% |
96,296
-1,200
| -1% | -$12.5K |
|
|
GRMN
2582
Garmin
GRMN
$46.9B
| $1.01M | ﹤0.01% |
9,976
+3,875
| +64% | +$378K |
|
2583
CALL
AdaptHealth
AHCO
$1.46B
| $1M | ﹤0.01% |
80,800
+8,400
| +12% | +$155K |
|
2584
Direxion Daily FTSE China Bear 3X ETF
YANG
$86.8M
| $1M | ﹤0.01% |
+5,377
| New | +$1.02M |
|
2585
PUT
Tower Semiconductor
TSEM
$26.4B
| $1M | ﹤0.01% |
23,600
-8,300
| -26% | -$347K |
|
2586
Vanguard FTSE Emerging Markets ETF
VWO
$119B
| $1M | ﹤0.01% |
24,785
-26,064
| -51% | -$1.06M |
|
2587
CALL
Anavex Life Sciences
AVXL
$222M
| $999K | ﹤0.01% |
116,600
+35,400
| +44% | +$353K |
|
2588
CALL
BellRing Brands
BRBR
$1.51B
| $999K | ﹤0.01% |
29,400
+28,700
| +4,100% | +$848K |
|
2589
CALL
DigitalBridge
DBRG
$2.94B
| $999K | ﹤0.01% |
83,400
-209,000
| -71% | -$2.63M |
|
|
DFTX
2590
CALL
Definium Therapeutics
DFTX
$5.73B
| $996K | ﹤0.01% |
314,500
-355,800
| -53% | -$1.18M |
|
|
LSXMK
2591
DELISTED
Liberty Media Corporation Series C Liberty SiriusXM Common Stock
LSXMK
| $996K | ﹤0.01% |
+45,953
| New | +$1.21M |
|
2592
CALL
Masco
MAS
$16B
| $994K | ﹤0.01% |
20,000
-2,800
| -12% | -$144K |
|
|
QLTB
2593
CALL
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $993K | ﹤0.01% |
12,000
-15,300
| -56% | -$1.27M |
|
2594
Algoma Steel
ASTL
$455M
| $991K | ﹤0.01% |
122,717
+116,701
| +1,940% | +$892K |
|
|
VTYX
2595
CALL
DELISTED
Ventyx Biosciences
VTYX
| $988K | ﹤0.01% |
29,500
+6,400
| +28% | +$249K |
|
2596
BILL Holdings
BILL
$4.33B
| $986K | ﹤0.01% |
12,158
-12,843
| -51% | -$1.19M |
|
2597
CALL
Eve Holding
EVEX
$798M
| $986K | ﹤0.01% |
136,300
+121,600
| +827% | +$801K |
|
2598
CALL
Methanex
MEOH
$4.32B
| $986K | ﹤0.01% |
21,200
+3,300
| +18% | +$155K |
|
2599
CALL
Protalix BioTherapeutics
PLX
$191M
| $985K | ﹤0.01% |
469,500
+133,800
| +40% | +$235K |
|
2600
PUT
Cerence
CRNC
$382M
| $983K | ﹤0.01% |
35,000
+34,800
| +17,400% | +$893K |
|
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.