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 | |
|---|---|---|---|---|---|---|
626
PUT
Norwegian Cruise Line
NCLH
$8.87B
| $16.2M | 0.01% |
854,300
-741,400
| -46% | -$17.9M |
|
627
CALL
Cameco
CCJ
$39.4B
| $16M | 0.01% |
389,000
-52,400
| -12% | -$2.47M |
|
628
CALL
iShares Gold Trust
IAU
$64.2B
| $16M | 0.01% |
271,000
-137,600
| -34% | -$7.44M |
|
629
CALL
MPLX
MPLX
$57.4B
| $16M | 0.01% |
298,200
-140,000
| -32% | -$7.33M |
|
|
TIGR
630
PUT
UP Fintech Holding
TIGR
$897M
| $15.9M | 0.01% |
1,851,200
+695,600
| +60% | +$5.19M |
|
|
FISV
631
PUT
Fiserv Inc
FISV
$26.8B
| $15.9M | 0.01% |
72,000
-57,200
| -44% | -$12.5M |
|
632
Newmont
NEM
$102B
| $15.9M | 0.01% |
328,401
-350,811
| -52% | -$15.4M |
|
633
CALL
Li Auto
LI
$12B
| $15.8M | 0.01% |
627,600
-339,200
| -35% | -$8.73M |
|
634
PUT
EQT Corp
EQT
$33.8B
| $15.8M | 0.01% |
295,900
+6,800
| +2% | +$347K |
|
635
CALL
Iris Energy
IREN
$14.8B
| $15.7M | 0.01% |
2,586,000
+285,800
| +12% | +$2.78M |
|
636
CALL
Lyft
LYFT
$5.57B
| $15.7M | 0.01% |
1,325,300
-160,900
| -11% | -$2.09M |
|
637
PUT
Western Digital
WDC
$192B
| $15.7M | 0.01% |
650,700
-103,410
| -14% | -$4.91M |
|
638
PUT
Trip.com Group
TCOM
$26.8B
| $15.6M | 0.01% |
245,400
+36,600
| +18% | +$2.4M |
|
639
PUT
TKO Group
TKO
$13.6B
| $15.6M | 0.01% |
102,000
-140,100
| -58% | -$21.4M |
|
640
CALL
American Conservative Values ETF
ACVF
$150M
| $15.6M | 0.01% |
2,142,000
-1,096,900
| -34% | -$48.6M |
|
641
PUT
Seagate
STX
$205B
| $15.5M | 0.01% |
183,000
+21,100
| +13% | +$1.99M |
|
642
CALL
MGM Resorts International
MGM
$11.6B
| $15.5M | 0.01% |
524,000
-147,900
| -22% | -$4.97M |
|
643
PUT
Williams-Sonoma
WSM
$26.2B
| $15.5M | 0.01% |
98,200
-28,200
| -22% | -$5.45M |
|
644
PUT
Mondelez International
MDLZ
$78.1B
| $15.5M | 0.01% |
228,400
+66,400
| +41% | +$4.09M |
|
645
PUT
Kenvue
KVUE
$36.7B
| $15.5M | 0.01% |
646,000
+275,500
| +74% | +$6.1M |
|
646
PUT
Unity
U
$12.8B
| $15.4M | 0.01% |
786,300
+31,500
| +4% | +$711K |
|
647
PUT
FTAI Aviation
FTAI
$22.8B
| $15.4M | 0.01% |
138,400
+64,100
| +86% | +$7.57M |
|
648
CALL
International Paper
IP
$20.2B
| $15.3M | 0.01% |
287,200
-7,400
| -3% | -$405K |
|
649
PUT
Linde
LIN
$235B
| $15.3M | 0.01% |
32,900
-34,300
| -51% | -$15.4M |
|
650
CALL
Autodesk
ADSK
$43B
| $15.3M | 0.01% |
58,400
-48,300
| -45% | -$13.7M |
|
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.