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 | |
|---|---|---|---|---|---|---|
4501
Direxion Daily CSI China Internet Index Bull 2X ETF
CWEB
$242M
| $171K | ﹤0.01% |
3,370
-547
| -14% | -$30.4K |
|
4502
PUT
Viant Technology
DSP
$229M
| $171K | ﹤0.01% |
39,400
-12,800
| -25% | -$55.3K |
|
4503
PUT
Halozyme
HALO
$9.88B
| $171K | ﹤0.01% |
4,500
-59,100
| -93% | -$2.77M |
|
4504
PUT
Pricesmart
PSMT
$5.94B
| $171K | ﹤0.01% |
2,400
| – | – |
|
4505
Rocket Lab Corp
RKLB
$36.6B
| $171K | ﹤0.01% |
42,508
+40,908
| +2,557% | +$184K |
|
4506
PUT
Tenable Holdings
TENB
$3.47B
| $171K | ﹤0.01% |
3,600
+3,000
| +500% | +$127K |
|
|
JMIA
4507
CALL
Jumia Technologies
JMIA
$708M
| $170K | ﹤0.01% |
51,700
-109,500
| -68% | -$394K |
|
4508
CALL
Mitek Systems
MITK
$756M
| $170K | ﹤0.01% |
17,800
+2,100
| +13% | +$20.1K |
|
4509
PUT
NiSource
NI
$21.5B
| $170K | ﹤0.01% |
6,100
+5,400
| +771% | +$148K |
|
|
PFSW
4510
DELISTED
PFSweb, Inc.
PFSW
| $170K | ﹤0.01% |
40,241
+12,020
| +43% | +$74.3K |
|
4511
Arcos Dorados Holdings
ARCO
$1.74B
| $169K | ﹤0.01% |
22,032
-5,047
| -19% | -$41.5K |
|
4512
Nautilus Biotechnolgy
NAUT
$132M
| $169K | ﹤0.01% |
61,113
+58,950
| +2,725% | +$124K |
|
|
LUCK
4513
PUT
Lucky Strike Entertainment
LUCK
$959M
| $169K | ﹤0.01% |
10,000
+7,800
| +355% | +$116K |
|
|
GMDA
4514
CALL
DELISTED
Gamida Cell Ltd. Ordinary Shares
GMDA
| $169K | ﹤0.01% |
209,800
+182,000
| +655% | +$266K |
|
|
PGTI
4515
DELISTED
PGT, Inc.
PGTI
| $169K | ﹤0.01% |
6,762
+4,342
| +179% | +$92.1K |
|
4516
PUT
Aecom
ACM
$9.46B
| $168K | ﹤0.01% |
2,000
-2,500
| -56% | -$216K |
|
4517
CALL
Arqit Quantum
ARQQ
$270M
| $168K | ﹤0.01% |
4,804
+1,868
| +64% | +$88.4K |
|
|
HEES
4518
PUT
DELISTED
H&E Equipment Services
HEES
| $168K | ﹤0.01% |
3,800
+600
| +19% | +$29.3K |
|
4519
PUT
Invesco
IVZ
$12.4B
| $168K | ﹤0.01% |
10,300
-60,000
| -85% | -$1.07M |
|
4520
Monolithic Power Systems
MPWR
$61.4B
| $168K | ﹤0.01% |
+336
| New | +$154K |
|
4521
PUT
nCino
NCNO
$2.06B
| $168K | ﹤0.01% |
6,800
+4,500
| +196% | +$119K |
|
4522
CALL
LiveRamp
RAMP
$2.29B
| $168K | ﹤0.01% |
7,700
-25,800
| -77% | -$615K |
|
4523
PUT
Sonic Automotive
SAH
$3.56B
| $168K | ﹤0.01% |
3,100
+2,900
| +1,450% | +$156K |
|
4524
CALL
Surgery Partners
SGRY
$2.15B
| $168K | ﹤0.01% |
4,900
-31,200
| -86% | -$1.01M |
|
|
XXII
4525
CALL
22nd Century Group
XXII
$1.28M
| – | – |
0
| – | – |
|
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.