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 | |
|---|---|---|---|---|---|---|
|
ORC
8726
Orchid Island Capital
ORC
$1.31B
| $1K | ﹤0.01% |
+130
| New | +$1.47K |
|
8727
Ovid Therapeutics
OVID
$435M
| $1K | ﹤0.01% |
+422
| New | +$1K |
|
8728
CALL
Owlet
OWLT
$153M
| $1K | ﹤0.01% |
357
-379
| -51% | -$2.25K |
|
8729
CALL
Ranpak Holdings
PACK
$553M
| $1K | ﹤0.01% |
+300
| New | +$1.91K |
|
8730
PUT
Paysign
PAYS
$486M
| $1K | ﹤0.01% |
500
-11,100
| -96% | -$37.9K |
|
|
PBPB
8731
CALL
DELISTED
Potbelly
PBPB
| $1K | ﹤0.01% |
200
-3,100
| -94% | -$23.3K |
|
8732
PCB Bancorp
PCB
$400M
| $1K | ﹤0.01% |
84
-16
| -16% | -$276 |
|
8733
POET Technologies
POET
$1.19B
| $1K | ﹤0.01% |
+388
| New | +$1.68K |
|
8734
PUT
Porch Group
PRCH
$1.3B
| $1K | ﹤0.01% |
1,300
-15,400
| -92% | -$36.5K |
|
8735
Perimeter Solutions
PRM
$5.5B
| $1K | ﹤0.01% |
203
-1,451
| -88% | -$12.5K |
|
|
ALP
8736
Alpha Compute
ALP
$5.08M
| $1K | ﹤0.01% |
+16
| New | +$1.36K |
|
|
ALP
8737
PUT
Alpha Compute
ALP
$5.08M
| $1K | ﹤0.01% |
20
| – | – |
|
8738
Pricesmart
PSMT
$5.75B
| $1K | ﹤0.01% |
17
-312
| -95% | -$21.9K |
|
8739
PUT
D-Wave Quantum
QBTS
$6B
| $1K | ﹤0.01% |
1,700
-1,100
| -39% | -$1.04K |
|
8740
Rani Therapeutics
RANI
$95.6M
| $1K | ﹤0.01% |
345
+45
| +15% | +$271 |
|
8741
Reading International Class A
RDI
$32.9M
| $1K | ﹤0.01% |
476
+76
| +19% | +$259 |
|
8742
Red Violet
RDVT
$859M
| $1K | ﹤0.01% |
85
-1,220
| -93% | -$26.2K |
|
8743
CALL
Replimune Group
REPL
$814M
| $1K | ﹤0.01% |
100
-2,700
| -96% | -$64.2K |
|
8744
PUT
Rigel Pharmaceuticals
RIGL
$680M
| $1K | ﹤0.01% |
130
+20
| +18% | +$318 |
|
8745
PUT
Rush Street Interactive
RSI
$3.24B
| $1K | ﹤0.01% |
+400
| New | +$1.54K |
|
8746
CALL
Retractable Technologies
RVP
$20.4M
| $1K | ﹤0.01% |
800
-1,800
| -69% | -$3.4K |
|
8747
PUT
Satellogic
SATL
$532M
| $1K | ﹤0.01% |
500
+100
| +25% | +$309 |
|
|
ECHO
8748
EchoStar
ECHO
$25.5B
| $1K | ﹤0.01% |
+94
| New | +$1.72K |
|
8749
CALL
Stellus Capital Investment Corp
SCM
$203M
| $1K | ﹤0.01% |
100
-600
| -86% | -$8.66K |
|
8750
ProShares UltraPro Short Dow 30
SDOW
$171M
| $1K | ﹤0.01% |
15
-6,133
| -100% | -$657K |
|
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.