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 | |
|---|---|---|---|---|---|---|
301
Advanced Micro Devices
AMD
$908B
| $48.5M | 0.03% |
+342,008
| New | +$37.2M |
|
302
CALL
Apollo Global Management
APO
$68.5B
| $47.6M | 0.03% |
335,300
-108,900
| -25% | -$14.4M |
|
303
CALL
MongoDB
MDB
$24.5B
| $47.3M | 0.03% |
225,400
-211,900
| -48% | -$39.2M |
|
304
PUT
Capital One
COF
$124B
| $47.3M | 0.03% |
222,200
-176,600
| -44% | -$33M |
|
305
CALL
Affirm
AFRM
$24.9B
| $46.9M | 0.03% |
679,000
-246,900
| -27% | -$12.8M |
|
306
CALL
Texas Instruments
TXN
$267B
| $46.4M | 0.03% |
223,700
-66,700
| -23% | -$11.8M |
|
307
PUT
Boston Scientific
BSX
$63.7B
| $46M | 0.03% |
428,400
-19,000
| -4% | -$1.92M |
|
308
CALL
Zscaler
ZS
$23B
| $45.6M | 0.03% |
145,100
-83,000
| -36% | -$20.7M |
|
309
PUT
Procter & Gamble
PG
$348B
| $45.4M | 0.03% |
284,900
-121,800
| -30% | -$19.9M |
|
310
CALL
Royal Caribbean
RCL
$76.5B
| $45.2M | 0.03% |
144,500
-19,700
| -12% | -$4.69M |
|
311
PUT
FedEx
FDX
$76.5B
| $45.2M | 0.03% |
199,000
+37,600
| +23% | +$8.23M |
|
312
State Street Health Care Select Sector SPDR ETF
XLV
$41.3B
| $45M | 0.03% |
333,580
+306,130
| +1,115% | +$41.3M |
|
313
CALL
American Express
AXP
$238B
| $44.9M | 0.03% |
140,900
-32,500
| -19% | -$9.15M |
|
314
PUT
Moderna
MRNA
$23.1B
| $44.9M | 0.03% |
1,626,800
+496,400
| +44% | +$13.1M |
|
|
OKLO
315
CALL
Oklo
OKLO
$7.74B
| $44.6M | 0.03% |
796,700
+144,200
| +22% | +$5.56M |
|
316
CALL
Shell
SHEL
$244B
| $44.3M | 0.03% |
629,800
+236,300
| +60% | +$15.8M |
|
|
B
317
CALL
Barrick Mining
B
$62.4B
| $44.2M | 0.03% |
2,120,800
-139,100
| -6% | -$2.72M |
|
318
CALL
BP
BP
$112B
| $43.7M | 0.03% |
1,460,600
-94,900
| -6% | -$2.78M |
|
319
CALL
Spotify
SPOT
$98.5B
| $43.4M | 0.02% |
81,900
-23,100
| -22% | -$14.8M |
|
320
CALL
Cheniere Energy
LNG
$55.7B
| $43.2M | 0.02% |
177,600
-25,300
| -12% | -$5.86M |
|
321
CALL
Honeywell
HON
$73.6B
| $43.2M | 0.02% |
196,709
-273,951
| -58% | -$55.5M |
|
|
322
PUT
Texas Instruments
TXN
$267B
| $42.8M | 0.02% |
206,300
-18,300
| -8% | -$3.25M |
|
323
PUT
NextEra Energy
NEE
$187B
| $42.7M | 0.02% |
614,400
+125,900
| +26% | +$8.75M |
|
324
PUT
Intuit
INTU
$78.1B
| $42.5M | 0.02% |
54,000
| – | – |
|
325
CALL
Medtronic
MDT
$104B
| $42.3M | 0.02% |
485,100
+171,100
| +54% | +$14.5M |
|
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.