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 | |
|---|---|---|---|---|---|---|
26
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $823M | 0.53% |
1,959,600
+930,800
| +90% | +$403M |
|
|
27
CALL
Alibaba
BABA
$283B
| $815M | 0.52% |
6,161,700
-3,757,300
| -38% | -$433M |
|
28
PUT
Booking.com
BKNG
$139B
| $803M | 0.51% |
4,355,000
+1,292,500
| +42% | +$247M |
|
|
29
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $715M | 0.46% |
4,607,600
-433,800
| -9% | -$78.7M |
|
30
PUT
Netflix
NFLX
$286B
| $649M | 0.42% |
6,961,000
-2,228,000
| -24% | -$212M |
|
|
31
CALL
Advanced Micro Devices
AMD
$888B
| $597M | 0.38% |
6,403,400
+410,600
| +7% | +$45.7M |
|
32
PUT
Broadcom
AVGO
$1.84T
| $566M | 0.36% |
3,379,300
-652,100
| -16% | -$138M |
|
33
PUT
iShares Morningstar Value ETF
ILCV
$1.3B
| $506M | 0.32% |
6,189,300
+2,054,700
| +50% | +$170M |
|
34
CALL
Palantir
PLTR
$318B
| $500M | 0.32% |
5,929,800
-1,798,400
| -23% | -$158M |
|
35
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $491M | 0.31% |
5,113,300
-2,304,500
| -31% | -$93.2M |
|
36
CALL
iShares Silver Trust
SLV
$28.4B
| $489M | 0.31% |
15,779,000
-2,174,300
| -12% | -$63.2M |
|
|
37
PUT
Advanced Micro Devices
AMD
$888B
| $484M | 0.31% |
4,710,200
+56,900
| +1% | +$6.33M |
|
|
38
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $478M | 0.31% |
5,726,300
+1,448,000
| +34% | +$58.6M |
|
|
39
CALL
Netflix
NFLX
$286B
| $472M | 0.3% |
5,060,000
-651,000
| -11% | -$61.9M |
|
|
40
PUT
TSMC
TSM
$2.2T
| $467M | 0.3% |
2,811,700
+2,000
| +0.1% | +$389K |
|
41
CALL
iShares Bitcoin Trust
IBIT
$48.9B
| $443M | 0.28% |
9,458,400
-201,100
| -2% | -$10.6M |
|
|
42
PUT
Palantir
PLTR
$318B
| $427M | 0.27% |
5,378,000
-2,116,400
| -28% | -$186M |
|
|
43
CALL
Broadcom
AVGO
$1.84T
| $421M | 0.27% |
2,695,100
-950,500
| -26% | -$201M |
|
44
CALL
Micron Technology
MU
$1.1T
| $392M | 0.25% |
4,511,500
+1,902,400
| +73% | +$183M |
|
|
45
PUT
Alibaba
BABA
$283B
| $387M | 0.25% |
2,998,100
-156,500
| -5% | -$18M |
|
46
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $348M | 0.22% |
5,873,800
-358,500
| -6% | -$74.6M |
|
|
47
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $346M | 0.22% |
5,503,800
+986,800
| +22% | +$205M |
|
|
48
CALL
Booking.com
BKNG
$139B
| $311M | 0.2% |
1,930,000
-1,682,500
| -47% | -$322M |
|
49
CALL
UnitedHealth
UNH
$396B
| $309M | 0.2% |
616,300
+104,100
| +20% | +$53.2M |
|
|
50
CALL
TSMC
TSM
$2.2T
| $306M | 0.2% |
1,844,600
-50,900
| -3% | -$9.89M |
|
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.