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 | |
|---|---|---|---|---|---|---|
2926
CALL
Syndax Pharmaceuticals
SNDX
$1.84B
| $798K | ﹤0.01% |
65,000
+3,500
| +6% | +$49.4K |
|
2927
PUT
Atkore
ATKR
$2.59B
| $797K | ﹤0.01% |
13,300
+7,900
| +146% | +$564K |
|
2928
CALL
Essex Property Trust
ESS
$18.9B
| $797K | ﹤0.01% |
2,600
+400
| +18% | +$117K |
|
2929
PUT
OSI Systems
OSIS
$3.57B
| $796K | ﹤0.01% |
+4,100
| New | +$781K |
|
|
NUVL
2930
CALL
DELISTED
Nuvalent
NUVL
| $794K | ﹤0.01% |
11,200
+7,300
| +187% | +$571K |
|
2931
CALL
Performance Food Group
PFGC
$17.5B
| $794K | ﹤0.01% |
10,100
-16,900
| -63% | -$1.41M |
|
2932
CALL
FLEX LNG
FLNG
$1.67B
| $793K | ﹤0.01% |
34,500
-10,100
| -23% | -$241K |
|
2933
PUT
Cooper Companies
COO
$13.7B
| $792K | ﹤0.01% |
9,400
+5,400
| +135% | +$484K |
|
2934
Genpact
G
$5.3B
| $790K | ﹤0.01% |
15,698
+9,423
| +150% | +$467K |
|
2935
LegalZoom.com
LZ
$1.23B
| $790K | ﹤0.01% |
91,805
-80,639
| -47% | -$722K |
|
2936
Texas Roadhouse
TXRH
$12.7B
| $790K | ﹤0.01% |
4,746
-5,261
| -53% | -$931K |
|
2937
CALL
Haemonetics
HAE
$3.58B
| $788K | ﹤0.01% |
12,400
+9,500
| +328% | +$646K |
|
|
GPGI
2938
PUT
GPGI Inc
GPGI
$4.06B
| $786K | ﹤0.01% |
72,400
+68,306
| +1,668% | +$838K |
|
2939
PUT
CenterPoint Energy
CNP
$29.1B
| $786K | ﹤0.01% |
21,700
+14,100
| +186% | +$473K |
|
|
AVDX
2940
DELISTED
AvidXchange
AVDX
| $784K | ﹤0.01% |
+92,530
| New | +$855K |
|
2941
PUT
Bank of Montreal
BMO
$125B
| $783K | ﹤0.01% |
8,200
-6,900
| -46% | -$682K |
|
2942
Elevance Health
ELV
$81.9B
| $782K | ﹤0.01% |
1,799
-671
| -27% | -$269K |
|
2943
PUT
Morgan Stanley Direct Lending Fund
MSDL
$1.29B
| $782K | ﹤0.01% |
39,200
+13,300
| +51% | +$275K |
|
2944
CALL
Casey's General Stores
CASY
$31.9B
| $781K | ﹤0.01% |
1,800
+700
| +64% | +$287K |
|
2945
CALL
Sprinklr
CXM
$1.33B
| $781K | ﹤0.01% |
93,600
-1,200
| -1% | -$10.5K |
|
|
BTC
2946
CALL
Grayscale Bitcoin Mini Trust ETF
BTC
$3.4B
| $780K | ﹤0.01% |
21,400
+12,200
| +133% | +$503K |
|
2947
CALL
Bumble
BMBL
$367M
| $779K | ﹤0.01% |
179,500
-16,700
| -9% | -$109K |
|
2948
CALL
indie Semiconductor
INDI
$733M
| $779K | ﹤0.01% |
383,200
-88,300
| -19% | -$307K |
|
2949
PUT
Atour Lifestyle Holdings
ATAT
$4.35B
| $776K | ﹤0.01% |
27,400
-29,600
| -52% | -$845K |
|
2950
PUT
iHeartMedia
IHRT
$535M
| $775K | ﹤0.01% |
469,900
-2,100
| -0.4% | -$4.23K |
|
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.