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 | |
|---|---|---|---|---|---|---|
4326
PUT
China Yuchai International
CYD
$1.69B
| $200K | ﹤0.01% |
11,800
+7,600
| +181% | +$117K |
|
4327
PUT
ICL Group
ICL
$6.58B
| $200K | ﹤0.01% |
35,200
-69,500
| -66% | -$409K |
|
|
MESO
4328
Mesoblast
MESO
$1.83B
| $200K | ﹤0.01% |
16,066
+1,817
| +13% | +$29.9K |
|
4329
nCino
NCNO
$2.06B
| $200K | ﹤0.01% |
+7,313
| New | +$231K |
|
4330
CALL
Pinnacle West Capital
PNW
$12.4B
| $200K | ﹤0.01% |
2,100
-5,600
| -73% | -$500K |
|
4331
PUT
Solid Biosciences
SLDB
$792M
| $200K | ﹤0.01% |
+54,200
| New | +$232K |
|
4332
Blink Charging
BLNK
$67.5M
| $199K | ﹤0.01% |
+216,830
| New | +$251K |
|
4333
CALL
INmune Bio
INMB
$44.9M
| $199K | ﹤0.01% |
25,600
-57,600
| -69% | -$457K |
|
4334
PUT
Lloyds Banking Group
LYG
$85.2B
| $199K | ﹤0.01% |
52,100
+800
| +2% | +$2.65K |
|
4335
PUT
TriMas Corp
TRS
$1.41B
| $199K | ﹤0.01% |
+8,500
| New | +$201K |
|
4336
CALL
Wabtec
WAB
$49.3B
| $199K | ﹤0.01% |
1,100
-16,600
| -94% | -$3.18M |
|
|
TTAN
4337
CALL
ServiceTitan Inc
TTAN
$8.03B
| $199K | ﹤0.01% |
2,100
-7,300
| -78% | -$708K |
|
4338
CALL
Jones Lang LaSalle
JLL
$15.8B
| $198K | ﹤0.01% |
800
-7,500
| -90% | -$1.97M |
|
4339
Neonode
NEON
$12.6M
| $198K | ﹤0.01% |
24,384
-3,627
| -13% | -$31.2K |
|
4340
iShares Mortgage Real Estate ETF
REM
$549M
| $198K | ﹤0.01% |
8,826
-13,445
| -60% | -$303K |
|
4341
Uranium Energy
UEC
$4.47B
| $198K | ﹤0.01% |
+41,480
| New | +$260K |
|
4342
CALL
AnaptysBio
ANAB
$1.54B
| $197K | ﹤0.01% |
10,600
-59,100
| -85% | -$986K |
|
4343
CALL
Fabrinet
FN
$14.9B
| $197K | ﹤0.01% |
1,000
| – | – |
|
|
SVM
4344
Silvercorp Metals
SVM
$2.02B
| $197K | ﹤0.01% |
50,980
+6,246
| +14% | +$21.9K |
|
4345
Applied Industrial Technologies
AIT
$12.4B
| $196K | ﹤0.01% |
+870
| New | +$214K |
|
4346
PUT
DigitalBridge
DBRG
$2.92B
| $196K | ﹤0.01% |
22,300
+400
| +2% | +$4.2K |
|
4347
Medpace
MEDP
$16.3B
| $196K | ﹤0.01% |
644
-834
| -56% | -$281K |
|
|
VSXY
4348
Victoria's Secret
VSXY
$7.09B
| $196K | ﹤0.01% |
10,575
-23,388
| -69% | -$688K |
|
|
VRN
4349
CALL
DELISTED
Veren
VRN
| $195K | ﹤0.01% |
29,500
-22,000
| -43% | -$122K |
|
|
AEVA
4350
Aeva Technologies
AEVA
$956M
| $194K | ﹤0.01% |
27,739
+18,031
| +186% | +$74.3K |
|
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.