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 | |
|---|---|---|---|---|---|---|
5851
PUT
Stereotaxis
STXS
$126M
| $53K | ﹤0.01% |
+26,100
| New | +$58.7K |
|
5852
Kartoon Studios
TOON
$35.2M
| $53K | ﹤0.01% |
19,654
-8,032
| -29% | -$36.5K |
|
5853
PUT
Trinity Industries
TRN
$2.49B
| $53K | ﹤0.01% |
2,200
-2,200
| -50% | -$58.5K |
|
5854
Valmont Industries
VMI
$9.3B
| $53K | ﹤0.01% |
169
-13,565
| -99% | -$4.33M |
|
5855
PUT
Vroom Inc
VRM
$39M
| $53K | ﹤0.01% |
750
+32
| +4% | +$2.59K |
|
|
PDCO
5856
DELISTED
Patterson Companies, Inc.
PDCO
| $53K | ﹤0.01% |
+1,986
| New | +$55.8K |
|
|
AMAM
5857
CALL
DELISTED
Ambrx Biopharma Inc
AMAM
| $53K | ﹤0.01% |
+6,000
| New | +$30.2K |
|
|
NEX
5858
PUT
DELISTED
NexTier Oilfield Solutions Inc.
NEX
| $53K | ﹤0.01% |
6,700
+3,600
| +116% | +$32.2K |
|
|
AAWW
5859
CALL
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $53K | ﹤0.01% |
11,800
+3,800
| +48% | +$386K |
|
5860
CALL
Acacia Research
ACTG
$428M
| $52K | ﹤0.01% |
13,500
+12,300
| +1,025% | +$52K |
|
5861
CALL
Amphastar Pharmaceuticals
AMPH
$879M
| $52K | ﹤0.01% |
1,400
-100
| -7% | -$3.28K |
|
5862
Axalta
AXTA
$7.66B
| $52K | ﹤0.01% |
1,738
+152
| +10% | +$4.37K |
|
5863
Kanzhun
BZ
$7.27B
| $52K | ﹤0.01% |
+2,745
| New | +$59.9K |
|
5864
PUT
Cerus
CERS
$433M
| $52K | ﹤0.01% |
17,800
-21,700
| -55% | -$65.3K |
|
5865
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$89.3M
| $52K | ﹤0.01% |
2,388
-5,763
| -71% | -$132K |
|
5866
PUT
Clarus
CLAR
$123M
| $52K | ﹤0.01% |
5,600
+3,900
| +229% | +$36.6K |
|
5867
PUT
Cue Biopharma
CUE
$113M
| $52K | ﹤0.01% |
487
+74
| +18% | +$7.06K |
|
5868
PUT
Denali Therapeutics
DNLI
$3.65B
| $52K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$60.5K |
|
5869
PUT
8x8 Inc
EGHT
$269M
| $52K | ﹤0.01% |
12,600
-2,000
| -14% | -$10K |
|
5870
PUT
F&G Annuities & Life
FG
$3.79B
| $52K | ﹤0.01% |
+2,900
| New | +$58.1K |
|
|
NXDR
5871
CALL
Nextdoor Holdings
NXDR
$847M
| $52K | ﹤0.01% |
24,500
-38,400
| -61% | -$82K |
|
5872
Truth Social America First ETF
MAGA
$31.1M
| $52K | ﹤0.01% |
+1,400
| New | +$54.2K |
|
5873
CALL
Onto Innovation
ONTO
$12.9B
| $52K | ﹤0.01% |
600
+500
| +500% | +$40.6K |
|
5874
Pegasystems
PEGA
$5.02B
| $52K | ﹤0.01% |
+2,184
| New | +$46K |
|
5875
CALL
SITE Centers
SITC
$225M
| $52K | ﹤0.01% |
5,512
+257
| +5% | +$2.61K |
|
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.