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 | |
|---|---|---|---|---|---|---|
7726
Omeros
OMER
$821M
| $8K | ﹤0.01% |
1,732
-38,416
| -96% | -$139K |
|
7727
PUT
Onto Innovation
ONTO
$13B
| $8K | ﹤0.01% |
100
-400
| -80% | -$32.4K |
|
7728
CALL
Offerpad Solutions
OPAD
$20.1M
| $8K | ﹤0.01% |
103
-424
| -80% | -$42.1K |
|
|
7729
PUT
Offerpad Solutions
OPAD
$20.1M
| $8K | ﹤0.01% |
113
-56
| -33% | -$5.57K |
|
7730
PUT
OptimizeRx
OPRX
$120M
| $8K | ﹤0.01% |
600
-1,600
| -73% | -$26.8K |
|
7731
PUT
Pangaea Logistics
PANL
$488M
| $8K | ﹤0.01% |
1,500
-7,000
| -82% | -$42K |
|
7732
CALL
Park Aerospace
PKE
$785M
| $8K | ﹤0.01% |
600
-300
| -33% | -$4.23K |
|
|
PTN
7733
PUT
Palatin Technologies
PTN
$13.9M
| $8K | ﹤0.01% |
60
-6
| -9% | -$997 |
|
7734
RF Industries
RFIL
$132M
| $8K | ﹤0.01% |
1,904
+1,804
| +1,804% | +$9.05K |
|
|
SAFE
7735
CALL
Safehold
SAFE
$1.19B
| $8K | ﹤0.01% |
3,200
-624
| -16% | -$31.3K |
|
7736
ProShares UltraShort SmallCap600
SDD
$1.29M
| $8K | ﹤0.01% |
340
+274
| +415% | +$6.32K |
|
7737
CALL
Seanergy Maritime Holdings
SHIP
$350M
| $8K | ﹤0.01% |
+1,700
| New | +$9.86K |
|
7738
Virgin Galactic
SPCE
$325M
| $8K | ﹤0.01% |
100
-22
| -18% | -$2.19K |
|
7739
PUT
Alaunos Therapeutics
TCRT
$4.71M
| $8K | ﹤0.01% |
91
-288
| -76% | -$27.4K |
|
7740
PUT
TELA Bio
TELA
$29.1M
| $8K | ﹤0.01% |
+800
| New | +$8.83K |
|
7741
PUT
TriNet
TNET
$2.94B
| $8K | ﹤0.01% |
100
-100
| -50% | -$7.83K |
|
7742
Taysha Gene Therapies
TSHA
$1.59B
| $8K | ﹤0.01% |
+10,767
| New | +$13.9K |
|
7743
PUT
Titan International
TWI
$519M
| $8K | ﹤0.01% |
800
-600
| -43% | -$8.5K |
|
7744
CALL
Wheels Up
UP
$219M
| $8K | ﹤0.01% |
67
-771
| -92% | -$171K |
|
|
VMEO
7745
PUT
DELISTED
Vimeo
VMEO
| $8K | ﹤0.01% |
2,300
+1,200
| +109% | +$4.71K |
|
|
VXRT
7746
CALL
DELISTED
Vaxart
VXRT
| $8K | ﹤0.01% |
10,700
-34,000
| -76% | -$31.6K |
|
7747
PUT
Wrap Technologies
WRAP
$99.8M
| $8K | ﹤0.01% |
4,900
-300
| -6% | -$621 |
|
7748
PUT
Xencor
XNCR
$1.47B
| $8K | ﹤0.01% |
+300
| New | +$9.25K |
|
7749
Zymeworks
ZYME
$1.69B
| $8K | ﹤0.01% |
894
-47,298
| -98% | -$412K |
|
|
PRSU
7750
Pursuit Attractions and Hospitality Inc
PRSU
$1.46B
| $8K | ﹤0.01% |
+400
| New | +$9.96K |
|
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.