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 | |
|---|---|---|---|---|---|---|
4026
CALL
Amplify Energy
AMPY
$156M
| $268K | ﹤0.01% |
71,700
-158,700
| -69% | -$791K |
|
4027
Alpha Metallurgical Resources
AMR
$1.76B
| $268K | ﹤0.01% |
2,145
-501
| -19% | -$81.5K |
|
4028
PUT
Box
BOX
$4.47B
| $268K | ﹤0.01% |
8,700
-164,600
| -95% | -$5.33M |
|
4029
Coty
COTY
$2.33B
| $268K | ﹤0.01% |
+49,116
| New | +$307K |
|
4030
Camping World
CWH
$382M
| $268K | ﹤0.01% |
16,600
-33,776
| -67% | -$690K |
|
4031
CALL
International Seaways
INSW
$4.62B
| $268K | ﹤0.01% |
8,100
+1,300
| +19% | +$47.6K |
|
4032
Lumen
LUMN
$6.32B
| $268K | ﹤0.01% |
68,473
-715,663
| -91% | -$3.57M |
|
4033
CALL
Revolution Medicines
RVMD
$38.5B
| $268K | ﹤0.01% |
7,600
-22,800
| -75% | -$925K |
|
4034
PUT
Bio-Rad Laboratories Class A
BIO
$8.82B
| $267K | ﹤0.01% |
1,100
+600
| +120% | +$181K |
|
4035
CALL
Hamilton Lane
HLNE
$3.86B
| $267K | ﹤0.01% |
1,800
+1,600
| +800% | +$244K |
|
4036
PUT
MannKind Corp
MNKD
$1.21B
| $267K | ﹤0.01% |
53,100
-234,000
| -82% | -$1.31M |
|
4037
PUT
Viant Technology
DSP
$227M
| $266K | ﹤0.01% |
+21,500
| New | +$394K |
|
4038
Tradr 1.25X NVDA Bear Daily ETF
NVDS
$17.1M
| $266K | ﹤0.01% |
3,024
-11,135
| -79% | -$845K |
|
4039
Vanguard S&P 500 Growth ETF
VOOG
$24.9B
| $266K | ﹤0.01% |
4,782
-4,818
| -50% | -$292K |
|
4040
Akebia Therapeutics
AKBA
$335M
| $265K | ﹤0.01% |
138,470
+9,488
| +7% | +$19.4K |
|
4041
Capital Southwest
CSWC
$1.48B
| $265K | ﹤0.01% |
+11,898
| New | +$269K |
|
4042
Neurocrine Biosciences
NBIX
$18.3B
| $265K | ﹤0.01% |
+2,400
| New | +$304K |
|
4043
CALL
Candel Therapeutics
CADL
$682M
| $264K | ﹤0.01% |
46,800
-14,000
| -23% | -$114K |
|
4044
PUT
Cheniere Energy
CQP
$31.9B
| $264K | ﹤0.01% |
4,000
+1,300
| +48% | +$80.7K |
|
4045
Consolidated Edison
ED
$41.3B
| $264K | ﹤0.01% |
+2,393
| New | +$235K |
|
4046
CALL
Macerich
MAC
$7.45B
| $264K | ﹤0.01% |
15,400
-25,600
| -62% | -$490K |
|
|
NAK
4047
Northern Dynasty Minerals
NAK
$773M
| $264K | ﹤0.01% |
+229,879
| New | +$167K |
|
|
SII
4048
CALL
Sprott
SII
$2.68B
| $264K | ﹤0.01% |
5,900
-6,400
| -52% | -$276K |
|
4049
CALL
ProShares UltraShort Industrials
SIJ
$6.02M
| $264K | ﹤0.01% |
1,525
-1,400
| -48% | -$45K |
|
4050
Silicon Motion
SIMO
$7.19B
| $264K | ﹤0.01% |
5,234
-2,038
| -28% | -$110K |
|
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.