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 | |
|---|---|---|---|---|---|---|
551
CALL
Interactive Brokers
IBKR
$41.7B
| $18.9M | 0.01% |
456,400
-65,200
| -13% | -$3.23M |
|
552
UnitedHealth
UNH
$392B
| $18.9M | 0.01% |
36,061
+5,973
| +20% | +$3.05M |
|
553
CALL
AB InBev
BUD
$161B
| $18.9M | 0.01% |
306,600
-80,200
| -21% | -$4.39M |
|
554
CALL
CBRE Group
CBRE
$40.1B
| $18.8M | 0.01% |
143,800
+33,200
| +30% | +$4.51M |
|
555
CALL
CAVA Group
CAVA
$7.26B
| $18.8M | 0.01% |
217,300
-9,000
| -4% | -$976K |
|
556
PUT
Simon Property Group
SPG
$73.4B
| $18.8M | 0.01% |
112,900
-33,600
| -23% | -$5.87M |
|
557
CALL
Truist Financial
TFC
$63.2B
| $18.7M | 0.01% |
455,500
+47,700
| +12% | +$2.13M |
|
558
PUT
PNC Financial Services
PNC
$101B
| $18.7M | 0.01% |
106,200
+20,700
| +24% | +$3.91M |
|
559
PUT
Williams Companies
WMB
$91.1B
| $18.6M | 0.01% |
311,900
+115,100
| +58% | +$6.59M |
|
560
PUT
HCA Healthcare
HCA
$82.5B
| $18.6M | 0.01% |
53,900
-26,500
| -33% | -$8.52M |
|
561
CALL
The GEO Group
GEO
$4.19B
| $18.6M | 0.01% |
635,200
-158,000
| -20% | -$4.53M |
|
562
PUT
Blackrock
BLK
$164B
| $18.6M | 0.01% |
19,600
-21,700
| -53% | -$21.3M |
|
563
PUT
Zoom
ZM
$25.2B
| $18.5M | 0.01% |
251,200
-114,000
| -31% | -$9.09M |
|
564
CALL
Roku
ROKU
$21.2B
| $18.4M | 0.01% |
261,800
-119,000
| -31% | -$9.52M |
|
565
CALL
Mondelez International
MDLZ
$78.1B
| $18.4M | 0.01% |
271,400
-6,500
| -2% | -$401K |
|
566
PUT
Eaton
ETN
$158B
| $18.4M | 0.01% |
67,700
+1,600
| +2% | +$498K |
|
567
CALL
Ross Stores
ROST
$76.4B
| $18.4M | 0.01% |
144,000
-59,700
| -29% | -$8.36M |
|
568
CALL
Atlassian
TEAM
$21.7B
| $18.4M | 0.01% |
86,600
-35,200
| -29% | -$9.29M |
|
569
PUT
Affirm
AFRM
$24.8B
| $18.4M | 0.01% |
406,200
-345,600
| -46% | -$20.5M |
|
570
CALL
Archer Daniels Midland
ADM
$42.1B
| $18.3M | 0.01% |
381,600
-272,300
| -42% | -$13.2M |
|
571
CALL
MSCI
MSCI
$41.6B
| $18.3M | 0.01% |
32,300
+15,400
| +91% | +$8.95M |
|
572
PUT
Phillips 66
PSX
$84.8B
| $18.2M | 0.01% |
147,400
+45,200
| +44% | +$5.57M |
|
573
PUT
Northrop Grumman
NOC
$74.6B
| $18.2M | 0.01% |
35,500
-6,500
| -15% | -$3.1M |
|
574
PUT
Comcast
CMCSA
$84B
| $18.1M | 0.01% |
491,600
-217,500
| -31% | -$7.85M |
|
575
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$156M
| $18.1M | 0.01% |
352,300
-99,600
| -22% | -$4.61M |
|
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.