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 | |
|---|---|---|---|---|---|---|
6826
PUT
Toro Company
TTC
$8.79B
| $22K | ﹤0.01% |
+200
| New | +$22.3K |
|
|
UROY
6827
CALL
Uranium Royalty Corp
UROY
$478M
| $22K | ﹤0.01% |
11,000
+1,700
| +18% | +$4.06K |
|
6828
US Treasury 10 Year Note ETF
UTEN
$287M
| $22K | ﹤0.01% |
480
+180
| +60% | +$8.31K |
|
6829
CALL
Werner Enterprises
WERN
$2.2B
| $22K | ﹤0.01% |
500
-2,600
| -84% | -$118K |
|
|
IRD
6830
CALL
Opus Genetics
IRD
$287M
| $22K | ﹤0.01% |
6,000
+3,400
| +131% | +$12.2K |
|
|
NPKI
6831
CALL
NPK International
NPKI
$1.02B
| $22K | ﹤0.01% |
5,900
+5,400
| +1,080% | +$23.6K |
|
|
ATSG
6832
CALL
DELISTED
Air Transport Services Group
ATSG
| $22K | ﹤0.01% |
1,100
-3,400
| -76% | -$82.1K |
|
|
SIEN
6833
DELISTED
Sientra, Inc.
SIEN
| $22K | ﹤0.01% |
+14,607
| New | +$25.9K |
|
|
APRN
6834
DELISTED
Blue Apron Holdings, Inc. Class A Common Stock
APRN
| $22K | ﹤0.01% |
+2,725
| New | +$29.9K |
|
|
IDEX
6835
CALL
DELISTED
Ideanomics, Inc. Common Stock
IDEX
| $22K | ﹤0.01% |
1,701
-1,836
| -52% | -$34.9K |
|
6836
CALL
Adicet Bio
ACET
$77.6M
| $21K | ﹤0.01% |
231
+218
| +1,677% | +$27.4K |
|
6837
CALL
Aemetis
AMTX
$99.2M
| $21K | ﹤0.01% |
9,100
-92,800
| -91% | -$346K |
|
6838
CALL
Apogee Enterprises
APOG
$833M
| $21K | ﹤0.01% |
500
-2,900
| -85% | -$130K |
|
6839
PUT
AXIS Capital
AXS
$7.73B
| $21K | ﹤0.01% |
400
+300
| +300% | +$17.4K |
|
6840
CALL
Boston Omaha
BOC
$436M
| $21K | ﹤0.01% |
900
-200
| -18% | -$4.98K |
|
6841
PUT
Cabaletta Bio
CABA
$427M
| $21K | ﹤0.01% |
2,600
+200
| +8% | +$1.87K |
|
6842
Credit Acceptance
CACC
$5.82B
| $21K | ﹤0.01% |
50
-850
| -94% | -$374K |
|
6843
CALL
Celestica
CLS
$37.8B
| $21K | ﹤0.01% |
1,700
+1,500
| +750% | +$19.2K |
|
6844
CALL
Custom Truck One Source
CTOS
$2.21B
| $21K | ﹤0.01% |
3,100
-6,200
| -67% | -$43K |
|
6845
PUT
DocGo
DCGO
$64.2M
| $21K | ﹤0.01% |
2,500
+2,300
| +1,150% | +$20.3K |
|
6846
PUT
CapForce IBD 50 ETF
FFTY
$78.8M
| $21K | ﹤0.01% |
+900
| New | +$20.7K |
|
6847
CALL
Glacier Bancorp
GBCI
$6.36B
| $21K | ﹤0.01% |
500
-1,300
| -72% | -$59.5K |
|
|
TDAY
6848
USA Today Co
TDAY
$1.29B
| $21K | ﹤0.01% |
11,625
-13,285
| -53% | -$31.1K |
|
6849
PUT
Green Brick Partners
GRBK
$3.09B
| $21K | ﹤0.01% |
600
-6,000
| -91% | -$185K |
|
6850
PUT
Hayward Holdings
HAYW
$3.23B
| $21K | ﹤0.01% |
1,800
+500
| +38% | +$6.12K |
|
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.