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 | |
|---|---|---|---|---|---|---|
|
RXDX
5401
DELISTED
Prometheus Biosciences, Inc. Common Stock
RXDX
| $81K | ﹤0.01% |
+758
| New | +$87.2K |
|
5402
Atomera
ATOM
$197M
| $80K | ﹤0.01% |
12,627
-25,259
| -67% | -$171K |
|
5403
CALL
BlackSky Technology
BKSY
$934M
| $80K | ﹤0.01% |
6,688
-4,350
| -39% | -$58.7K |
|
5404
PUT
Cellebrite
CLBT
$3.61B
| $80K | ﹤0.01% |
13,200
-55,800
| -81% | -$302K |
|
|
ITOS
5405
PUT
DELISTED
iTeos Therapeutics
ITOS
| $80K | ﹤0.01% |
5,900
+5,700
| +2,850% | +$102K |
|
5406
CALL
Ocugen
OCGN
$416M
| $80K | ﹤0.01% |
94,600
-216,600
| -70% | -$236K |
|
|
ODP
5407
CALL
DELISTED
ODP
ODP
| $80K | ﹤0.01% |
1,800
-12,000
| -87% | -$586K |
|
5408
PUT
Puma Biotechnology
PBYI
$396M
| $80K | ﹤0.01% |
26,100
+15,900
| +156% | +$59.9K |
|
5409
CALL
Zentalis Pharmaceuticals
ZNTL
$347M
| $80K | ﹤0.01% |
4,700
-3,600
| -43% | -$72.9K |
|
|
GTHX
5410
CALL
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $80K | ﹤0.01% |
30,100
+24,400
| +428% | +$117K |
|
|
SUMO
5411
DELISTED
Sumo Logic, Inc. Common Stock
SUMO
| $80K | ﹤0.01% |
6,745
+4,849
| +256% | +$53.1K |
|
|
VZIO
5412
PUT
DELISTED
VIZIO Holding Corp.
VZIO
| $80K | ﹤0.01% |
8,800
+8,000
| +1,000% | +$72.2K |
|
5413
CALL
Allogene Therapeutics
ALLO
$659M
| $79K | ﹤0.01% |
16,100
-23,700
| -60% | -$152K |
|
5414
CALL
Cricut
CRCT
$974M
| $79K | ﹤0.01% |
7,800
-20,900
| -73% | -$202K |
|
5415
PUT
Energizer
ENR
$1.44B
| $79K | ﹤0.01% |
2,300
+700
| +44% | +$24.8K |
|
5416
CALL
Enova International
ENVA
$6.32B
| $79K | ﹤0.01% |
1,800
+900
| +100% | +$40.8K |
|
5417
Jefferies Financial Group
JEF
$12.7B
| $79K | ﹤0.01% |
+2,512
| New | +$90.8K |
|
|
OPLN
5418
CALL
Openlane
OPLN
$4.19B
| $79K | ﹤0.01% |
5,800
+2,300
| +66% | +$31.9K |
|
5419
Leslie's
LESL
$8.34M
| $79K | ﹤0.01% |
359
+159
| +80% | +$41.3K |
|
|
LNW
5420
DELISTED
Light & Wonder
LNW
| $79K | ﹤0.01% |
+1,320
| New | +$81.4K |
|
5421
PUT
Energy Vault
NRGV
$509M
| $79K | ﹤0.01% |
37,200
-6,400
| -15% | -$21.8K |
|
5422
PUT
Omeros
OMER
$839M
| $79K | ﹤0.01% |
17,200
+3,400
| +25% | +$12.3K |
|
5423
CALL
Rekor Systems
REKR
$85.5M
| $79K | ﹤0.01% |
63,600
-77,400
| -55% | -$123K |
|
|
RENT
5424
CALL
Rent the Runway
RENT
$118M
| $79K | ﹤0.01% |
1,395
-3,140
| -69% | -$220K |
|
5425
CALL
Simply Good Foods
SMPL
$916M
| $79K | ﹤0.01% |
2,000
-5,300
| -73% | -$196K |
|
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.