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 | |
|---|---|---|---|---|---|---|
1326
PUT
UBS Group
UBS
$169B
| $4.87M | ﹤0.01% |
158,900
+49,700
| +46% | +$1.66M |
|
1327
Range Resources
RRC
$9.08B
| $4.86M | ﹤0.01% |
121,615
+66,616
| +121% | +$2.56M |
|
1328
CALL
Fastenal
FAST
$53B
| $4.85M | ﹤0.01% |
125,200
-190,800
| -60% | -$7.15M |
|
|
JWN
1329
CALL
DELISTED
Nordstrom
JWN
| $4.84M | ﹤0.01% |
197,900
+5,400
| +3% | +$131K |
|
1330
Tyson Foods
TSN
$20B
| $4.84M | ﹤0.01% |
75,819
+6,409
| +9% | +$376K |
|
1331
CALL
Logitech
LOGI
$14.8B
| $4.83M | ﹤0.01% |
57,200
+300
| +0.5% | +$28.2K |
|
1332
CALL
Commercial Metals
CMC
$7.53B
| $4.83M | ﹤0.01% |
104,900
+87,500
| +503% | +$4.26M |
|
1333
PUT
Kimberly-Clark
KMB
$35.6B
| $4.79M | ﹤0.01% |
33,700
-12,900
| -28% | -$1.74M |
|
1334
PUT
Emerson Electric
EMR
$81.2B
| $4.79M | ﹤0.01% |
43,700
-55,700
| -56% | -$6.72M |
|
1335
CALL
Frontline
FRO
$8.65B
| $4.78M | ﹤0.01% |
322,100
+256,400
| +390% | +$4.24M |
|
1336
CALL
Guardant Health
GH
$19.9B
| $4.76M | ﹤0.01% |
111,800
+15,800
| +16% | +$682K |
|
1337
PUT
Jabil
JBL
$33.7B
| $4.76M | ﹤0.01% |
35,000
-67,000
| -66% | -$10.3M |
|
1338
CALL
FMC
FMC
$1.46B
| $4.76M | ﹤0.01% |
112,800
+28,600
| +34% | +$1.27M |
|
1339
PUT
BigBear.ai
BBAI
$1.37B
| $4.75M | ﹤0.01% |
1,659,300
+1,003,600
| +153% | +$4.78M |
|
1340
Global Payments
GPN
$21.3B
| $4.74M | ﹤0.01% |
48,430
-22,961
| -32% | -$2.4M |
|
1341
PUT
Blackstone Mortgage Trust
BXMT
$2.78B
| $4.74M | ﹤0.01% |
236,800
-48,200
| -17% | -$932K |
|
1342
CALL
GDS Holdings
GDS
$6.52B
| $4.74M | ﹤0.01% |
187,000
+33,500
| +22% | +$1.02M |
|
1343
Wynn Resorts
WYNN
$10B
| $4.73M | ﹤0.01% |
56,630
+20,183
| +55% | +$1.72M |
|
1344
CALL
Exelon
EXC
$48.4B
| $4.72M | ﹤0.01% |
102,400
-35,800
| -26% | -$1.5M |
|
1345
PUT
Diageo
DEO
$45.7B
| $4.71M | ﹤0.01% |
45,000
+22,800
| +103% | +$2.58M |
|
1346
CALL
Braze
BRZE
$2.39B
| $4.71M | ﹤0.01% |
130,500
+103,000
| +375% | +$4.14M |
|
1347
CALL
Crown Holdings
CCK
$12.5B
| $4.7M | ﹤0.01% |
52,700
-1,400
| -3% | -$122K |
|
1348
PUT
Aptiv
APTV
$11.9B
| $4.68M | ﹤0.01% |
78,600
-64,200
| -45% | -$4.07M |
|
1349
CALL
Cummins
CMI
$91.8B
| $4.67M | ﹤0.01% |
14,900
-11,100
| -43% | -$3.91M |
|
|
1350
PUT
FMC
FMC
$1.46B
| $4.67M | ﹤0.01% |
110,700
+16,500
| +18% | +$733K |
|
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.