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 | |
|---|---|---|---|---|---|---|
1351
PUT
Howmet Aerospace
HWM
$115B
| $4.67M | ﹤0.01% |
36,000
-14,100
| -28% | -$1.79M |
|
1352
PUT
Ross Stores
ROST
$74.5B
| $4.66M | ﹤0.01% |
36,500
-107,500
| -75% | -$15M |
|
1353
T-Mobile US
TMUS
$183B
| $4.66M | ﹤0.01% |
17,470
-23,235
| -57% | -$5.73M |
|
1354
PUT
Applied Digital
APLD
$8.54B
| $4.65M | ﹤0.01% |
828,000
+304,300
| +58% | +$2.39M |
|
1355
CALL
Magna International
MGA
$17.9B
| $4.65M | ﹤0.01% |
136,900
-16,000
| -10% | -$615K |
|
1356
PUT
Nextpower Inc
NXT
$15.8B
| $4.65M | ﹤0.01% |
110,400
-45,000
| -29% | -$2M |
|
1357
CALL
PTC
PTC
$13.1B
| $4.65M | ﹤0.01% |
30,000
-3,400
| -10% | -$585K |
|
1358
PUT
Builders FirstSource
BLDR
$7.59B
| $4.65M | ﹤0.01% |
37,200
-33,800
| -48% | -$4.92M |
|
1359
PUT
Sweetgreen
SG
$718M
| $4.64M | ﹤0.01% |
185,300
-140,100
| -43% | -$3.87M |
|
1360
PUT
BJs Wholesale Club
BJ
$11.7B
| $4.63M | ﹤0.01% |
40,600
-59,700
| -60% | -$6.15M |
|
1361
CALL
FIVE9
FIVN
$1.67B
| $4.63M | ﹤0.01% |
170,600
+35,000
| +26% | +$1.28M |
|
1362
CALL
M&T Bank
MTB
$35.6B
| $4.63M | ﹤0.01% |
25,900
+5,400
| +26% | +$1.02M |
|
1363
PUT
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45.8M
| $4.61M | ﹤0.01% |
268,700
+26,300
| +11% | +$533K |
|
|
1364
CALL
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45.8M
| $4.61M | ﹤0.01% |
263,000
+112,500
| +75% | +$2.28M |
|
|
WCN
1365
PUT
Waste Connections
WCN
$42.3B
| $4.59M | ﹤0.01% |
23,500
-19,700
| -46% | -$3.65M |
|
1366
PUT
Qorvo
QRVO
$7.65B
| $4.57M | ﹤0.01% |
63,100
+12,700
| +25% | +$967K |
|
1367
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$11.4M
| $4.56M | ﹤0.01% |
88,500
+57,300
| +184% | +$2.18M |
|
1368
PUT
Plains GP Holdings
PAGP
$5.25B
| $4.55M | ﹤0.01% |
213,000
+187,100
| +722% | +$3.94M |
|
1369
Autodesk
ADSK
$43.3B
| $4.55M | ﹤0.01% |
+17,371
| New | +$4.94M |
|
1370
PUT
NiSource
NI
$22.4B
| $4.55M | ﹤0.01% |
113,400
+112,400
| +11,240% | +$4.33M |
|
1371
PUT
Hertz
HTZ
$603M
| $4.53M | ﹤0.01% |
1,149,500
+414,500
| +56% | +$1.66M |
|
1372
CALL
Exelixis
EXEL
$14B
| $4.53M | ﹤0.01% |
122,600
-46,600
| -28% | -$1.66M |
|
1373
PUT
STMicroelectronics
STM
$47.7B
| $4.52M | ﹤0.01% |
206,000
-26,600
| -11% | -$654K |
|
1374
PUT
PPG Industries
PPG
$25.4B
| $4.52M | ﹤0.01% |
41,300
+3,400
| +9% | +$392K |
|
1375
Nu Holdings
NU
$68.5B
| $4.5M | ﹤0.01% |
439,923
+394,149
| +861% | +$4.66M |
|
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.