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 | |
|---|---|---|---|---|---|---|
901
CALL
Centene
CNC
$31.5B
| $9.85M | 0.01% |
162,300
-43,700
| -21% | -$2.64M |
|
902
PUT
MGM Resorts International
MGM
$11.5B
| $9.84M | 0.01% |
332,000
+13,700
| +4% | +$460K |
|
903
CALL
Hess Midstream
HESM
$5.22B
| $9.83M | 0.01% |
232,400
+222,600
| +2,271% | +$9.08M |
|
904
CALL
Skyworks Solutions
SWKS
$9B
| $9.82M | 0.01% |
151,900
-89,900
| -37% | -$6.84M |
|
905
CALL
Amplify Online Retail ETF
IBUY
$106M
| $9.79M | 0.01% |
735,500
-26,600
| -3% | -$1.76M |
|
906
CALL
Williams-Sonoma
WSM
$25.6B
| $9.75M | 0.01% |
61,700
-4,100
| -6% | -$792K |
|
907
PUT
Realty Income
O
$60.4B
| $9.75M | 0.01% |
168,100
-91,400
| -35% | -$5.06M |
|
908
CALL
Trip.com Group
TCOM
$27B
| $9.73M | 0.01% |
153,100
-126,200
| -45% | -$8.26M |
|
909
CALL
UiPath
PATH
$5.34B
| $9.72M | 0.01% |
943,600
-104,200
| -10% | -$1.34M |
|
910
PUT
AstraZeneca
AZN
$261B
| $9.7M | 0.01% |
66,000
-57,650
| -47% | -$8.34M |
|
911
CALL
Simon Property Group
SPG
$73.1B
| $9.7M | 0.01% |
58,400
+17,800
| +44% | +$3.11M |
|
912
CALL
Chubb
CB
$136B
| $9.69M | 0.01% |
32,100
-4,900
| -13% | -$1.36M |
|
913
CALL
Semtech
SMTC
$12.7B
| $9.67M | 0.01% |
281,000
+245,300
| +687% | +$12.1M |
|
914
CALL
Paychex
PAYX
$39.1B
| $9.64M | 0.01% |
62,500
-6,800
| -10% | -$1M |
|
|
FLG
915
PUT
Flagstar Bank National Association
FLG
$6.07B
| $9.62M | 0.01% |
828,200
-657,600
| -44% | -$7.4M |
|
916
PUT
Rubrik
RBRK
$14.9B
| $9.62M | 0.01% |
157,800
+73,700
| +88% | +$5.03M |
|
917
CALL
Ally Financial
ALLY
$13.3B
| $9.59M | 0.01% |
263,000
+24,200
| +10% | +$891K |
|
918
CALL
2x Long VIX Futures ETF
UVIX
$302M
| $9.59M | 0.01% |
16,745
+13,916
| +492% | +$9.12M |
|
919
CALL
Mobileye
MBLY
$6.26B
| $9.57M | 0.01% |
665,200
-464,200
| -41% | -$7.58M |
|
920
PUT
American Tower
AMT
$76.5B
| $9.57M | 0.01% |
44,000
-17,600
| -29% | -$3.45M |
|
921
CALL
Fidelity Wise Origin Bitcoin Fund
FBTC
$12B
| $9.57M | 0.01% |
133,000
+87,100
| +190% | +$7.08M |
|
922
CALL
Sony
SONY
$121B
| $9.56M | 0.01% |
376,600
-220,900
| -37% | -$5.1M |
|
923
PUT
Zillow
Z
$6.74B
| $9.56M | 0.01% |
185,800
-105,700
| -36% | -$8.08M |
|
|
WBA
924
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $9.54M | 0.01% |
854,400
-1,635,800
| -66% | -$17.8M |
|
925
CALL
Ferrari
RACE
$63.1B
| $9.54M | 0.01% |
22,300
-5,700
| -20% | -$2.56M |
|
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.