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 | |
|---|---|---|---|---|---|---|
|
API
5951
CALL
Agora
API
$337M
| $41K | ﹤0.01% |
10,300
-5,000
| -33% | -$26.1K |
|
|
API
5952
PUT
Agora
API
$337M
| $41K | ﹤0.01% |
10,300
+9,300
| +930% | +$48.5K |
|
5953
Global X MSCI Argentina ETF
ARGT
$866M
| $41K | ﹤0.01% |
514
-1,810
| -78% | -$154K |
|
5954
PUT
Archrock
AROC
$6.21B
| $41K | ﹤0.01% |
1,600
-700
| -30% | -$18.9K |
|
5955
PUT
Astronics
ATRO
$3.38B
| $41K | ﹤0.01% |
+2,040
| New | +$34.3K |
|
5956
AudioCodes
AUDC
$235M
| $41K | ﹤0.01% |
4,378
+4,173
| +2,036% | +$44.5K |
|
5957
A2Z Smart Technologies
AZ
$250M
| $41K | ﹤0.01% |
+5,937
| New | +$41.2K |
|
5958
Brown & Brown
BRO
$23.7B
| $41K | ﹤0.01% |
+333
| New | +$37.2K |
|
5959
CALL
Cars.com
CARS
$664M
| $41K | ﹤0.01% |
+3,700
| New | +$56.2K |
|
5960
ClearPoint Neuro
CLPT
$437M
| $41K | ﹤0.01% |
3,480
+463
| +15% | +$7.2K |
|
|
DEA
5961
Easterly Government Properties
DEA
$1.15B
| $41K | ﹤0.01% |
+1,553
| New | +$42.7K |
|
5962
Dole
DOLE
$1.36B
| $41K | ﹤0.01% |
2,855
+2,280
| +397% | +$31.5K |
|
5963
Douglas Elliman
DOUG
$155M
| $41K | ﹤0.01% |
+24,202
| New | +$43.8K |
|
|
DRD
5964
DRDGold
DRD
$1.81B
| $41K | ﹤0.01% |
2,691
-19,306
| -88% | -$222K |
|
5965
PUT
Erie Indemnity
ERIE
$12.2B
| $41K | ﹤0.01% |
100
-900
| -90% | -$367K |
|
5966
PUT
Graphic Packaging
GPK
$3.24B
| $41K | ﹤0.01% |
1,600
+1,200
| +300% | +$32.1K |
|
5967
Harmonic Inc
HLIT
$1.22B
| $41K | ﹤0.01% |
4,304
+823
| +24% | +$9.07K |
|
5968
PUT
Holley
HLLY
$326M
| $41K | ﹤0.01% |
16,000
+1,900
| +13% | +$5.33K |
|
5969
CALL
Jasper Therapeutics
JSPR
$20.7M
| $41K | ﹤0.01% |
9,600
-15,000
| -61% | -$99.8K |
|
5970
PUT
Ramaco Resources Class A
METC
$639M
| $41K | ﹤0.01% |
5,147
-15,013
| -74% | -$140K |
|
5971
PUT
Natural Resource Partners
NRP
$1.31B
| $41K | ﹤0.01% |
400
-400
| -50% | -$41.9K |
|
5972
CALL
NRX Pharmaceuticals
NRXP
$134M
| $41K | ﹤0.01% |
+20,200
| New | +$56.9K |
|
5973
CALL
Paymentus
PAY
$4.39B
| $41K | ﹤0.01% |
1,600
+1,000
| +167% | +$29.6K |
|
5974
CALL
Palomar
PLMR
$3.61B
| $41K | ﹤0.01% |
300
-100
| -25% | -$11.8K |
|
5975
CarParts.com
PRTS
$42.4M
| $41K | ﹤0.01% |
4,164
-2,271
| -35% | -$24.9K |
|
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.