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 | |
|---|---|---|---|---|---|---|
2276
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $1.55M | ﹤0.01% |
39,000
+10,400
| +36% | +$417K |
|
|
OTLY
2277
CALL
Oatly Group
OTLY
$417M
| $1.55M | ﹤0.01% |
157,400
+154,385
| +5,121% | +$1.67M |
|
2278
CALL
Compass
COMP
$8.27B
| $1.55M | ﹤0.01% |
177,100
-41,500
| -19% | -$329K |
|
2279
CALL
Teradata
TDC
$2.68B
| $1.54M | ﹤0.01% |
68,700
+64,700
| +1,618% | +$1.75M |
|
2280
PUT
Targa Resources
TRGP
$60.4B
| $1.54M | ﹤0.01% |
7,700
-6,800
| -47% | -$1.35M |
|
2281
CALL
Cipher Digital
CIFR
$9.47B
| $1.54M | ﹤0.01% |
670,400
-304,900
| -31% | -$1.39M |
|
|
LAC
2282
CALL
Lithium Americas
LAC
$986M
| $1.54M | ﹤0.01% |
568,600
-12,700
| -2% | -$38.3K |
|
2283
PUT
AeroVironment
AVAV
$7.57B
| $1.54M | ﹤0.01% |
12,900
-9,200
| -42% | -$1.41M |
|
2284
PUT
Saia
SAIA
$11.3B
| $1.54M | ﹤0.01% |
4,400
+1,200
| +38% | +$522K |
|
|
WAY
2285
CALL
Waystar Holding Corp
WAY
$4.32B
| $1.53M | ﹤0.01% |
41,000
+17,300
| +73% | +$685K |
|
2286
iShares 3-7 Year Treasury Bond ETF
IEI
$18.1B
| $1.53M | ﹤0.01% |
12,958
+1,487
| +13% | +$173K |
|
2287
PUT
Mohawk Industries
MHK
$6.9B
| $1.53M | ﹤0.01% |
13,400
+10,200
| +319% | +$1.22M |
|
|
PPLI
2288
CALL
People Inc
PPLI
$3.1B
| $1.52M | ﹤0.01% |
40,471
+26,209
| +184% | +$956K |
|
2289
UGI
UGI
$8B
| $1.52M | ﹤0.01% |
46,042
+17,563
| +62% | +$556K |
|
2290
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $1.52M | ﹤0.01% |
27,700
-2,900
| -9% | -$187K |
|
2291
PUT
Amkor Technology
AMKR
$16.1B
| $1.52M | ﹤0.01% |
84,000
-9,100
| -10% | -$206K |
|
2292
Diageo
DEO
$46.2B
| $1.52M | ﹤0.01% |
14,478
+184
| +1% | +$20.8K |
|
2293
iShares US Aerospace & Defense ETF
ITA
$14.2B
| $1.52M | ﹤0.01% |
9,903
-21,402
| -68% | -$3.27M |
|
2294
CALL
Trane Technologies
TT
$106B
| $1.52M | ﹤0.01% |
4,500
-22,900
| -84% | -$8.28M |
|
2295
PUT
Rocket Companies
RKT
$36.9B
| $1.51M | ﹤0.01% |
125,600
+34,600
| +38% | +$446K |
|
2296
CALL
Cracker Barrel
CBRL
$1.2B
| $1.51M | ﹤0.01% |
39,000
-8,800
| -18% | -$443K |
|
2297
CALL
Idexx Laboratories
IDXX
$42.9B
| $1.51M | ﹤0.01% |
3,600
-1,200
| -25% | -$521K |
|
2298
Marqeta
MQ
$1.8B
| $1.51M | ﹤0.01% |
91,686
+76,403
| +500% | +$1.2M |
|
2299
PUT
Hormel Foods
HRL
$13.9B
| $1.51M | ﹤0.01% |
48,800
-22,600
| -32% | -$671K |
|
2300
CALL
InterDigital
IDCC
$6.68B
| $1.51M | ﹤0.01% |
7,300
+1,400
| +24% | +$282K |
|
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.