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 | |
|---|---|---|---|---|---|---|
4876
PUT
Amprius Technologies
AMPX
$1.34B
| $119K | ﹤0.01% |
44,600
-4,700
| -10% | -$13.9K |
|
|
CRDL
4877
CALL
Cardiol Therapeutics
CRDL
$139M
| $119K | ﹤0.01% |
122,800
-19,900
| -14% | -$24.4K |
|
4878
Lithia Motors
LAD
$8.9B
| $119K | ﹤0.01% |
406
-4
| -1% | -$1.36K |
|
|
LAND
4879
PUT
Gladstone Land Corp
LAND
$357M
| $119K | ﹤0.01% |
11,400
-8,700
| -43% | -$95.3K |
|
|
THS
4880
PUT
DELISTED
Treehouse Foods
THS
| $119K | ﹤0.01% |
4,400
-35,200
| -89% | -$1.12M |
|
4881
PUT
Tennant Co
TNC
$1.41B
| $119K | ﹤0.01% |
1,500
-3,500
| -70% | -$296K |
|
|
LB
4882
LandBridge Co
LB
$2.13B
| $119K | ﹤0.01% |
+1,661
| New | +$118K |
|
4883
ARK Space & Defense Innovation ETF
ARKX
$786M
| $118K | ﹤0.01% |
+6,686
| New | +$132K |
|
4884
CALL
Ashland
ASH
$3.33B
| $118K | ﹤0.01% |
2,000
+500
| +33% | +$31.9K |
|
4885
BJ's Restaurants
BJRI
$1.56B
| $118K | ﹤0.01% |
3,452
-6,078
| -64% | -$216K |
|
|
OCFT
4886
CALL
DELISTED
OneConnect Financial Technology
OCFT
| $118K | ﹤0.01% |
+17,700
| New | +$78.4K |
|
4887
Paysafe
PSFE
$434M
| $118K | ﹤0.01% |
7,530
-4,433
| -37% | -$80.5K |
|
4888
CALL
Reinsurance Group of America
RGA
$15.6B
| $118K | ﹤0.01% |
600
-900
| -60% | -$187K |
|
4889
CALL
Sprout Social
SPT
$509M
| $118K | ﹤0.01% |
5,400
+1,400
| +35% | +$40.7K |
|
4890
Strategic Education
STRA
$1.92B
| $118K | ﹤0.01% |
+1,412
| New | +$130K |
|
4891
Astronics
ATRO
$3.38B
| $117K | ﹤0.01% |
+5,813
| New | +$97.7K |
|
|
DRD
4892
PUT
DRDGold
DRD
$1.81B
| $117K | ﹤0.01% |
7,600
-23,000
| -75% | -$264K |
|
4893
PUT
Globant
GLOB
$1.57B
| $117K | ﹤0.01% |
+1,000
| New | +$179K |
|
4894
Information Services Group
III
$197M
| $117K | ﹤0.01% |
30,019
+357
| +1% | +$1.17K |
|
4895
PUT
Intrepid Potash
IPI
$474M
| $117K | ﹤0.01% |
4,000
+1,600
| +67% | +$42.2K |
|
4896
Direxion Daily Junior Gold Miners Index Bear 2X ETF
JDST
$29.5M
| $117K | ﹤0.01% |
365
+139
| +62% | +$61.2K |
|
4897
CALL
loanDepot
LDI
$542M
| $117K | ﹤0.01% |
98,900
-71,300
| -42% | -$116K |
|
4898
CALL
abrdn Physical Palladium Shares ETF
PALL
$635M
| $117K | ﹤0.01% |
+6,500
| New | +$114K |
|
4899
PUT
PubMatic
PUBM
$592M
| $117K | ﹤0.01% |
12,900
+3,300
| +34% | +$43.5K |
|
4900
CALL
Twist Bioscience
TWST
$5.69B
| $117K | ﹤0.01% |
3,000
-2,300
| -43% | -$104K |
|
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.