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 | |
|---|---|---|---|---|---|---|
51
PUT
Costco
COST
$412B
| $305M | 0.2% |
322,700
-143,100
| -31% | -$140M |
|
52
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $283M | 0.18% |
531,900
+129,700
| +32% | +$63.1M |
|
|
53
iShares 20+ Year Treasury Bond ETF
TLT
$42.3B
| $278M | 0.18% |
+3,057,978
| New | +$272M |
|
54
CALL
JPMorgan Chase
JPM
$918B
| $277M | 0.18% |
1,127,900
-170,300
| -13% | -$43.4M |
|
55
CALL
Walmart Inc
WMT
$878B
| $275M | 0.18% |
3,134,000
-601,400
| -16% | -$56.4M |
|
|
56
PUT
JPMorgan Chase
JPM
$918B
| $273M | 0.17% |
1,113,200
-244,600
| -18% | -$62.4M |
|
|
57
CALL
Costco
COST
$412B
| $255M | 0.16% |
269,100
-210,300
| -44% | -$205M |
|
58
CALL
Boeing
BA
$161B
| $252M | 0.16% |
1,477,800
-1,013,600
| -41% | -$175M |
|
|
59
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $242M | 0.15% |
453,500
-373,100
| -45% | -$181M |
|
60
CALL
Intel
INTC
$530B
| $241M | 0.15% |
10,625,100
-715,700
| -6% | -$15.7M |
|
61
CALL
Pinduoduo
PDD
$121B
| $241M | 0.15% |
2,034,500
-336,100
| -14% | -$38.6M |
|
62
CALL
Citigroup
C
$223B
| $236M | 0.15% |
3,325,400
-204,000
| -6% | -$15.6M |
|
63
PUT
Super Micro Computer
SMCI
$16.5B
| $235M | 0.15% |
7,122,200
-2,760,900
| -28% | -$105M |
|
64
CALL
Salesforce
CRM
$139B
| $229M | 0.15% |
853,900
+49,200
| +6% | +$15.3M |
|
|
65
PUT
Boeing
BA
$161B
| $229M | 0.15% |
1,339,800
-745,200
| -36% | -$129M |
|
|
KFYP
66
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $228M | 0.15% |
6,540,900
-3,327,000
| -34% | -$116M |
|
67
PUT
Goldman Sachs
GS
$320B
| $227M | 0.15% |
414,700
-125,900
| -23% | -$75.8M |
|
|
68
PUT
Citigroup
C
$223B
| $225M | 0.14% |
3,166,500
+266,600
| +9% | +$20.3M |
|
69
PUT
Micron Technology
MU
$1.1T
| $222M | 0.14% |
2,559,900
+249,700
| +11% | +$24M |
|
70
CALL
ExxonMobil
XOM
$629B
| $217M | 0.14% |
1,823,800
-198,100
| -10% | -$21.9M |
|
71
PUT
Eli Lilly
LLY
$1.05T
| $206M | 0.13% |
268,200
-130,800
| -33% | -$109M |
|
72
CALL
Nike
NKE
$63.7B
| $204M | 0.13% |
3,219,100
+1,596,100
| +98% | +$117M |
|
|
73
PUT
Walmart Inc
WMT
$878B
| $202M | 0.13% |
2,651,300
-1,416,500
| -35% | -$133M |
|
74
CALL
Applovin
APP
$144B
| $193M | 0.12% |
729,100
+89,500
| +14% | +$30.8M |
|
|
75
PUT
Pinduoduo
PDD
$121B
| $190M | 0.12% |
1,603,200
+118,100
| +8% | +$13.6M |
|
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.