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 | |
|---|---|---|---|---|---|---|
951
PUT
FirstEnergy
FE
$28.6B
| $8.8M | 0.01% |
217,700
+132,000
| +154% | +$5.26M |
|
952
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $8.77M | 0.01% |
414,400
+39,800
| +11% | +$1.16M |
|
953
CALL
Dick's Sporting Goods
DKS
$18.3B
| $8.71M | 0.01% |
43,200
-84,100
| -66% | -$18.8M |
|
954
CALL
LKQ Corp
LKQ
$6.33B
| $8.7M | 0.01% |
204,500
+94,700
| +86% | +$3.76M |
|
|
OKLO
955
PUT
Oklo
OKLO
$7.66B
| $8.68M | 0.01% |
401,300
+95,000
| +31% | +$3.21M |
|
956
PUT
Generac Holdings
GNRC
$12.4B
| $8.68M | 0.01% |
68,500
-13,900
| -17% | -$1.99M |
|
957
CALL
Global E Online
GLBE
$5.8B
| $8.65M | 0.01% |
242,600
+75,700
| +45% | +$3.72M |
|
958
PUT
Arbor Realty Trust
ABR
$968M
| $8.64M | 0.01% |
735,800
-241,200
| -25% | -$3.12M |
|
959
PUT
Waste Management
WM
$95.2B
| $8.63M | 0.01% |
37,300
-4,400
| -11% | -$974K |
|
960
CALL
HubSpot
HUBS
$9.72B
| $8.63M | 0.01% |
15,100
-50,400
| -77% | -$35.4M |
|
961
CALL
NuScale Power
SMR
$3.05B
| $8.61M | 0.01% |
608,100
+152,600
| +34% | +$3.08M |
|
962
CALL
Sprott Junior Uranium Miners ETF
URNJ
$322M
| $8.6M | 0.01% |
271,300
+219,100
| +420% | +$3.88M |
|
963
CALL
Arthur J. Gallagher & Co
AJG
$62.2B
| $8.6M | 0.01% |
24,900
+3,200
| +15% | +$1.01M |
|
964
PUT
Celestica
CLS
$38.5B
| $8.59M | 0.01% |
109,000
+1,900
| +2% | +$202K |
|
|
MPT
965
CALL
Medical Properties Trust
MPT
$2.88B
| $8.58M | 0.01% |
1,423,700
-2,450,400
| -63% | -$12.4M |
|
966
PUT
Commault Systems
CVLT
$5.84B
| $8.58M | 0.01% |
54,400
+30,000
| +123% | +$4.94M |
|
967
CALL
SentinelOne
S
$5.95B
| $8.57M | 0.01% |
471,500
-224,600
| -32% | -$4.87M |
|
968
Fidelity Wise Origin Bitcoin Fund
FBTC
$12B
| $8.57M | 0.01% |
119,045
-44,699
| -27% | -$3.64M |
|
|
UCD
969
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $8.57M | 0.01% |
194,000
-13,500
| -7% | -$596K |
|
970
CALL
Marathon Petroleum
MPC
$91.1B
| $8.57M | 0.01% |
58,800
-92,800
| -61% | -$13.7M |
|
971
CALL
Alnylam Pharmaceuticals
ALNY
$35.9B
| $8.56M | 0.01% |
31,700
+4,200
| +15% | +$1.08M |
|
972
CALL
Iron Mountain
IRM
$37.1B
| $8.54M | 0.01% |
99,300
-7,500
| -7% | -$723K |
|
973
PUT
Enterprise Products Partners
EPD
$84B
| $8.54M | 0.01% |
250,100
+126,900
| +103% | +$4.23M |
|
974
CALL
Cenovus Energy
CVE
$55.4B
| $8.5M | 0.01% |
611,200
+201,600
| +49% | +$2.9M |
|
975
CALL
Novartis
NVS
$297B
| $8.46M | 0.01% |
75,900
+5,600
| +8% | +$596K |
|
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.