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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5726
Monro
MNRO
$383M
| $52K | ﹤0.01% |
3,614
+3,117
| +627% | +$59.6K |
|
|
MREO
5727
PUT
Mereo BioPharma
MREO
$54.7M
| $52K | ﹤0.01% |
23,200
-9,800
| -30% | -$27.7K |
|
5728
Magnachip Semiconductor
MX
$119M
| $52K | ﹤0.01% |
+15,371
| New | +$64.7K |
|
5729
NeoGenomics
NEO
$1.96B
| $52K | ﹤0.01% |
+5,552
| New | +$69.3K |
|
|
NOTV
5730
DELISTED
Inotiv
NOTV
| $52K | ﹤0.01% |
23,766
+11,520
| +94% | +$42.3K |
|
5731
Penske Automotive Group
PAG
$14.3B
| $52K | ﹤0.01% |
367
-32
| -8% | -$5.13K |
|
5732
PUT
Red Rock Resorts
RRR
$3.77B
| $52K | ﹤0.01% |
1,200
-200
| -14% | -$9.46K |
|
|
SEMR
5733
DELISTED
Semrush
SEMR
| $52K | ﹤0.01% |
5,672
+5,662
| +56,620% | +$77.2K |
|
|
SLI
5734
CALL
Standard Lithium
SLI
$502M
| $52K | ﹤0.01% |
41,300
+18,000
| +77% | +$26.1K |
|
5735
CALL
Smart Sand
SND
$185M
| $52K | ﹤0.01% |
20,200
+17,200
| +573% | +$40.4K |
|
5736
Veru
VERU
$36M
| $52K | ﹤0.01% |
10,760
+5,721
| +114% | +$35.5K |
|
5737
PUT
Vestis
VSTS
$1.91B
| $52K | ﹤0.01% |
5,300
+4,900
| +1,225% | +$65K |
|
|
CON
5738
Concentra Group Holdings
CON
$4.05B
| $52K | ﹤0.01% |
2,430
-1,700
| -41% | -$37.4K |
|
5739
CALL
Andersons Inc
ANDE
$2.41B
| $51K | ﹤0.01% |
1,200
-300
| -20% | -$12.7K |
|
5740
CALL
Certara
CERT
$1.26B
| $51K | ﹤0.01% |
5,200
+1,800
| +53% | +$21.9K |
|
|
5741
PUT
Certara
CERT
$1.26B
| $51K | ﹤0.01% |
5,200
+4,500
| +643% | +$54.7K |
|
5742
PUT
CG Oncology
CGON
$6.28B
| $51K | ﹤0.01% |
2,100
+700
| +50% | +$19.7K |
|
5743
PUT
Clarivate
CLVT
$1.27B
| $51K | ﹤0.01% |
13,100
+10,400
| +385% | +$49.3K |
|
5744
PUT
Costamare
CMRE
$1.88B
| $51K | ﹤0.01% |
5,200
-18,000
| -78% | -$199K |
|
|
DDL
5745
PUT
Dingdong
DDL
$562M
| $51K | ﹤0.01% |
18,900
+400
| +2% | +$1.3K |
|
5746
Energizer
ENR
$1.44B
| $51K | ﹤0.01% |
+1,736
| New | +$55.6K |
|
5747
EverQuote
EVER
$892M
| $51K | ﹤0.01% |
+1,965
| New | +$45K |
|
5748
KB Financial Group
KB
$41.4B
| $51K | ﹤0.01% |
+951
| New | +$54.9K |
|
|
LNW
5749
PUT
DELISTED
Light & Wonder
LNW
| $51K | ﹤0.01% |
600
+100
| +20% | +$9.63K |
|
5750
CALL
Lantern Pharma
LTRN
$33.6M
| $51K | ﹤0.01% |
+14,600
| New | +$60.6K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.