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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
226
CALL
United Airlines
UAL
$38.5B
| $69.3M | 0.04% |
870,900
-46,600
| -5% | -$3.43M |
|
227
CALL
Lam Research
LRCX
$400B
| $68.4M | 0.04% |
702,300
-159,400
| -18% | -$12.6M |
|
228
CALL
lululemon athletica
LULU
$12.9B
| $68.3M | 0.04% |
287,500
+94,700
| +49% | +$26.1M |
|
229
CALL
GE Aerospace
GE
$357B
| $67.6M | 0.04% |
265,800
+18,300
| +7% | +$4.02M |
|
230
CALL
Datadog
DDOG
$88.3B
| $67.4M | 0.04% |
501,500
-248,500
| -33% | -$27.5M |
|
231
PUT
Marathon Digital Holdings
MARA
$4.78B
| $67.1M | 0.04% |
4,276,800
+1,303,000
| +44% | +$18.7M |
|
232
PUT
Carnival Corporation Ltd
CCL
$36B
| $66.8M | 0.04% |
2,375,900
-555,800
| -19% | -$11.9M |
|
233
PUT
MongoDB
MDB
$24.6B
| $66.1M | 0.04% |
314,800
+25,900
| +9% | +$4.79M |
|
234
CALL
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
| $66.1M | 0.04% |
1,123,800
+127,000
| +13% | +$2.66M |
|
235
CALL
Baidu
BIDU
$36.6B
| $65.8M | 0.04% |
767,100
-258,400
| -25% | -$22.3M |
|
236
CALL
Newmont
NEM
$103B
| $65.8M | 0.04% |
1,128,700
-86,900
| -7% | -$4.64M |
|
237
CALL
Shopify
SHOP
$152B
| $65.4M | 0.04% |
566,800
-222,300
| -28% | -$22.2M |
|
238
PUT
Target
TGT
$62.8B
| $65M | 0.04% |
658,700
+14,300
| +2% | +$1.37M |
|
239
CALL
Comcast
CMCSA
$85.2B
| $64.5M | 0.04% |
1,806,700
+142,000
| +9% | +$4.91M |
|
240
CALL
Coca-Cola
KO
$355B
| $64.2M | 0.04% |
907,100
-1,059,400
| -54% | -$75.5M |
|
|
NVO
241
CALL
Novo Nordisk
NVO
$215B
| $63.5M | 0.04% |
920,500
-221,500
| -19% | -$15.1M |
|
242
Alphabet (Google) Class C
GOOG
$4.23T
| $63.5M | 0.04% |
357,870
+283,043
| +378% | +$46.8M |
|
243
CALL
Trade Desk
TTD
$8.39B
| $63.4M | 0.04% |
880,100
-553,200
| -39% | -$35.3M |
|
244
PUT
Occidental Petroleum
OXY
$57B
| $63.2M | 0.04% |
1,504,000
+850,500
| +130% | +$35.5M |
|
|
245
TSMC
TSM
$2.19T
| $63.2M | 0.04% |
278,926
-201,596
| -42% | -$37.3M |
|
246
CALL
Dell
DELL
$288B
| $62.8M | 0.04% |
512,300
-134,400
| -21% | -$13.7M |
|
247
CALL
Lockheed Martin
LMT
$119B
| $62.7M | 0.04% |
135,400
-34,000
| -20% | -$15.9M |
|
248
CALL
RTX Corp
RTX
$263B
| $62.6M | 0.04% |
428,900
+177,300
| +70% | +$23.6M |
|
|
249
State Street SPDR S&P 500 ETF Trust
SPY
$789B
| $61.9M | 0.04% |
+100,129
| New | +$57.2M |
|
250
PUT
Reddit
RDDT
$32.5B
| $60.9M | 0.03% |
404,300
+21,700
| +6% | +$2.46M |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.