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 | |
|---|---|---|---|---|---|---|
|
PDCO
2351
CALL
DELISTED
Patterson Companies, Inc.
PDCO
| $1.44M | ﹤0.01% |
46,200
-2,300
| -5% | -$71.4K |
|
2352
Match Group
MTCH
$8.84B
| $1.44M | ﹤0.01% |
+46,194
| New | +$1.51M |
|
2353
CALL
Melco Resorts & Entertainment
MLCO
$2.1B
| $1.44M | ﹤0.01% |
273,200
+20,100
| +8% | +$113K |
|
2354
PUT
Regions Financial
RF
$26.3B
| $1.44M | ﹤0.01% |
66,100
-55,000
| -45% | -$1.28M |
|
2355
CALL
Coca-Cola Europacific Partners
CCEP
$46.5B
| $1.44M | ﹤0.01% |
16,500
-9,700
| -37% | -$791K |
|
2356
Life Time Group Holdings
LTH
$9.42B
| $1.43M | ﹤0.01% |
47,333
+44,946
| +1,883% | +$1.32M |
|
2357
PUT
Portillo's
PTLO
$315M
| $1.43M | ﹤0.01% |
120,100
+90,000
| +299% | +$1.17M |
|
2358
CALL
Service Corp International
SCI
$11.4B
| $1.43M | ﹤0.01% |
17,800
+17,200
| +2,867% | +$1.35M |
|
2359
Rapid7
RPD
$634M
| $1.42M | ﹤0.01% |
+53,718
| New | +$1.83M |
|
2360
PUT
Qfin Holdings
QFIN
$1.61B
| $1.42M | ﹤0.01% |
31,700
+24,600
| +346% | +$1.02M |
|
|
SAND
2361
CALL
DELISTED
Sandstorm Gold
SAND
| $1.42M | ﹤0.01% |
188,500
+125,100
| +197% | +$782K |
|
|
LX
2362
CALL
LexinFintech Holdings
LX
$244M
| $1.42M | ﹤0.01% |
140,900
+71,500
| +103% | +$599K |
|
2363
CALL
Lear
LEA
$7.19B
| $1.42M | ﹤0.01% |
16,100
-7,400
| -31% | -$702K |
|
2364
PUT
Arvinas
ARVN
$518M
| $1.42M | ﹤0.01% |
202,000
+179,900
| +814% | +$2.82M |
|
2365
CALL
Mettler-Toledo International
MTD
$26.8B
| $1.42M | ﹤0.01% |
1,200
-300
| -20% | -$383K |
|
|
2366
PUT
Mettler-Toledo International
MTD
$26.8B
| $1.42M | ﹤0.01% |
1,200
+300
| +33% | +$383K |
|
2367
CALL
Argan
AGX
$7.98B
| $1.42M | ﹤0.01% |
10,800
+5,200
| +93% | +$726K |
|
2368
CALL
Delek US
DK
$3.87B
| $1.41M | ﹤0.01% |
93,700
+44,600
| +91% | +$772K |
|
2369
CALL
Equifax
EFX
$20.3B
| $1.41M | ﹤0.01% |
5,800
+4,500
| +346% | +$1.13M |
|
2370
PUT
Joby Aviation
JOBY
$6.82B
| $1.41M | ﹤0.01% |
234,600
-108,000
| -32% | -$809K |
|
2371
Global E Online
GLBE
$6.08B
| $1.41M | ﹤0.01% |
39,594
+38,438
| +3,325% | +$1.89M |
|
2372
CALL
Halozyme
HALO
$9.72B
| $1.41M | ﹤0.01% |
22,100
-4,900
| -18% | -$285K |
|
2373
PUT
Alamos Gold
AGI
$12.4B
| $1.41M | ﹤0.01% |
52,700
+12,000
| +29% | +$271K |
|
|
PBT
2374
PUT
Permian Basin Royalty Trust
PBT
$1.36B
| $1.41M | ﹤0.01% |
142,200
+6,300
| +5% | +$68.3K |
|
2375
PUT
Viking Holdings
VIK
$44.9B
| $1.4M | ﹤0.01% |
35,300
+16,900
| +92% | +$779K |
|
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.