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 | |
|---|---|---|---|---|---|---|
3401
CALL
Rush Enterprises Class A
RUSHA
$5.98B
| $502K | ﹤0.01% |
9,400
-2,600
| -22% | -$149K |
|
3402
IQVIA
IQV
$35.6B
| $501K | ﹤0.01% |
+2,847
| New | +$552K |
|
3403
CALL
Rush Street Interactive
RSI
$3.26B
| $501K | ﹤0.01% |
46,800
+3,700
| +9% | +$48.6K |
|
3404
CALL
Caleres
CAL
$420M
| $499K | ﹤0.01% |
29,000
-35,400
| -55% | -$636K |
|
3405
Clover Health Investments
CLOV
$2.25B
| $499K | ﹤0.01% |
139,001
-163,668
| -54% | -$657K |
|
3406
PUT
Ezcorp Inc
EZPW
$1.87B
| $499K | ﹤0.01% |
33,900
-32,000
| -49% | -$422K |
|
3407
CALL
Fiverr
FVRR
$398M
| $499K | ﹤0.01% |
21,100
-138,300
| -87% | -$4.02M |
|
3408
PUT
Idacorp
IDA
$8.2B
| $499K | ﹤0.01% |
4,300
| – | – |
|
3409
Mama's Creations
MAMA
$825M
| $499K | ﹤0.01% |
76,700
+66,708
| +668% | +$460K |
|
3410
CALL
Ascendis Pharma A/S
ASND
$16.6B
| $498K | ﹤0.01% |
3,200
+300
| +10% | +$42.9K |
|
3411
Companhia Siderúrgica Nacional
SID
$1.49B
| $498K | ﹤0.01% |
298,671
+235,862
| +376% | +$363K |
|
3412
Invesco CurrencyShares Japanese Yen Trust
FXY
$426M
| $497K | ﹤0.01% |
8,089
+762
| +10% | +$46.2K |
|
3413
PUT
MarketAxess Holdings
MKTX
$4.19B
| $497K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$462K |
|
3414
CALL
Navitas Semiconductor
NVTS
$2.78B
| $497K | ﹤0.01% |
242,500
-46,100
| -16% | -$132K |
|
3415
Symbotic
SYM
$5.28B
| $497K | ﹤0.01% |
+24,628
| New | +$629K |
|
3416
CALL
Capricor Therapeutics
CAPR
$405M
| $496K | ﹤0.01% |
52,300
-241,600
| -82% | -$3.35M |
|
3417
CALL
Alkermes
ALKS
$8.79B
| $495K | ﹤0.01% |
15,000
-12,500
| -45% | -$408K |
|
3418
PUT
Dave Inc
DAVE
$5.16B
| $495K | ﹤0.01% |
6,000
+4,600
| +329% | +$431K |
|
3419
PUT
IMAX
IMAX
$2.47B
| $495K | ﹤0.01% |
18,800
+17,600
| +1,467% | +$439K |
|
3420
PUT
Anterix
ATEX
$1.83B
| $494K | ﹤0.01% |
13,500
+13,300
| +6,650% | +$457K |
|
3421
Liberty Global Class A
LBTYA
$3.35B
| $494K | ﹤0.01% |
42,922
-80,217
| -65% | -$933K |
|
3422
PUT
United Therapeutics
UTHR
$26.3B
| $493K | ﹤0.01% |
1,600
+100
| +7% | +$34.3K |
|
3423
CALL
Universal Technical Institute
UTI
$2.12B
| $493K | ﹤0.01% |
19,200
-1,400
| -7% | -$37.8K |
|
3424
BigBear.ai
BBAI
$1.36B
| $492K | ﹤0.01% |
+172,253
| New | +$820K |
|
3425
CALL
California Resources
CRC
$4.51B
| $492K | ﹤0.01% |
11,200
-14,800
| -57% | -$702K |
|
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.