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 | |
|---|---|---|---|---|---|---|
1276
PUT
Clorox
CLX
$11.3B
| $5.23M | ﹤0.01% |
35,500
-45,100
| -56% | -$6.89M |
|
|
VRNA
1277
PUT
DELISTED
Verona Pharma
VRNA
| $5.21M | ﹤0.01% |
82,000
+65,400
| +394% | +$3.91M |
|
1278
CALL
ICICI Bank
IBN
$105B
| $5.19M | ﹤0.01% |
164,800
+69,100
| +72% | +$2.01M |
|
1279
PUT
Trimble
TRMB
$11.7B
| $5.19M | ﹤0.01% |
79,100
+75,100
| +1,878% | +$5.4M |
|
1280
PUT
Ollie's Bargain Outlet
OLLI
$3.94B
| $5.19M | ﹤0.01% |
44,600
-35,300
| -44% | -$3.73M |
|
|
P
1281
PUT
Everpure Inc
P
$25B
| $5.17M | ﹤0.01% |
116,900
-52,900
| -31% | -$3.19M |
|
|
BNY
1282
PUT
Bank of New York Mellon
BNY
$109B
| $5.17M | ﹤0.01% |
61,700
-134,900
| -69% | -$11.3M |
|
1283
PUT
Toyota
TM
$209B
| $5.17M | ﹤0.01% |
29,300
+8,700
| +42% | +$1.62M |
|
1284
CALL
Madrigal Pharmaceuticals
MDGL
$12.5B
| $5.17M | ﹤0.01% |
15,600
-18,500
| -54% | -$6.08M |
|
1285
Walmart Inc
WMT
$863B
| $5.16M | ﹤0.01% |
58,815
+32,629
| +125% | +$3.06M |
|
1286
CALL
O'Reilly Automotive
ORLY
$71.4B
| $5.16M | ﹤0.01% |
54,000
+12,000
| +29% | +$1.04M |
|
1287
PUT
Alpha Metallurgical Resources
AMR
$1.82B
| $5.15M | ﹤0.01% |
41,100
+14,500
| +55% | +$2.36M |
|
1288
CALL
Peloton Interactive
PTON
$2.61B
| $5.14M | ﹤0.01% |
813,000
-769,200
| -49% | -$6.04M |
|
1289
CALL
Duolingo
DUOL
$5.62B
| $5.12M | ﹤0.01% |
16,500
-10,200
| -38% | -$3.49M |
|
1290
CALL
Dynatrace
DT
$11.8B
| $5.11M | ﹤0.01% |
108,400
-152,100
| -58% | -$8.32M |
|
1291
CALL
MarketAxess Holdings
MKTX
$4.06B
| $5.11M | ﹤0.01% |
23,600
+14,800
| +168% | +$3.11M |
|
1292
CALL
Starwood Property Trust
STWD
$6.05B
| $5.1M | ﹤0.01% |
258,200
-389,500
| -60% | -$7.65M |
|
1293
PUT
Synopsys
SNPS
$71.5B
| $5.1M | ﹤0.01% |
11,900
-62,300
| -84% | -$30.3M |
|
1294
PUT
C3.ai
AI
$1.27B
| $5.1M | ﹤0.01% |
242,400
-520,800
| -68% | -$14.8M |
|
|
TYNS
1295
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $5.09M | ﹤0.01% |
34,300
-59,400
| -63% | -$8.82M |
|
1296
CALL
Copart
CPRT
$25.2B
| $5.09M | ﹤0.01% |
90,000
-46,800
| -34% | -$2.63M |
|
1297
ZIM Integrated Shipping Services
ZIM
$3.08B
| $5.06M | ﹤0.01% |
346,780
+270,812
| +356% | +$5.09M |
|
1298
American Airlines Group
AAL
$8.97B
| $5.04M | ﹤0.01% |
478,235
+226,224
| +90% | +$3.41M |
|
|
GRMN
1299
CALL
Garmin
GRMN
$46.3B
| $5.04M | ﹤0.01% |
23,200
-24,800
| -52% | -$5.36M |
|
1300
AGNC Investment
AGNC
$12.3B
| $5.02M | ﹤0.01% |
524,407
+421,009
| +407% | +$4.2M |
|
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.