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 | Miscellaneous | 98.27% |
| 2 | Technology | 0.74% |
| 3 | Communication Services | 0.19% |
| 4 | Consumer Discretionary | 0.18% |
| 5 | Healthcare | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
551
PUT
Archer Aviation
ACHR
$4.4B
| $20.7M | 0.01% |
1,907,700
+812,900
| +74% | +$7.61M |
|
552
PUT
Sunrun
RUN
$2.14B
| $20.7M | 0.01% |
2,529,100
+1,764,000
| +231% | +$13.9M |
|
553
CALL
Duke Energy
DUK
$93.7B
| $20.7M | 0.01% |
175,100
-148,400
| -46% | -$17.5M |
|
554
PUT
Return Stacked Bonds & Managed Futures ETF
RSBT
$153M
| $20.6M | 0.01% |
770,000
+546,500
| +245% | +$8.68M |
|
555
CALL
Humana
HUM
$48.2B
| $20.6M | 0.01% |
84,200
-128,400
| -60% | -$32M |
|
556
PUT
Estee Lauder
EL
$37.6B
| $20.5M | 0.01% |
253,900
-214,100
| -46% | -$13.8M |
|
557
PUT
Union Pacific
UNP
$172B
| $20.5M | 0.01% |
89,100
+6,600
| +8% | +$1.47M |
|
558
CALL
AutoZone
AZO
$48.7B
| $20.4M | 0.01% |
5,500
+3,700
| +206% | +$13.6M |
|
559
CALL
Thermo Fisher Scientific
TMO
$227B
| $20.4M | 0.01% |
50,200
+2,600
| +5% | +$1.09M |
|
560
CALL
Teva Pharmaceuticals
TEVA
$42.4B
| $20.3M | 0.01% |
1,213,900
-547,900
| -31% | -$8.84M |
|
561
PUT
SoundHound AI
SOUN
$2.99B
| $20.2M | 0.01% |
1,879,100
+87,700
| +5% | +$826K |
|
562
Iris Energy
IREN
$17.6B
| $20.1M | 0.01% |
1,382,126
+94,371
| +7% | +$766K |
|
563
CALL
Enphase Energy
ENPH
$4.81B
| $20M | 0.01% |
505,600
+293,700
| +139% | +$13.6M |
|
564
CALL
CME Group
CME
$101B
| $20M | 0.01% |
72,600
-11,900
| -14% | -$3.24M |
|
|
EA
565
PUT
DELISTED
Electronic Arts
EA
| $20M | 0.01% |
125,000
-50,800
| -29% | -$7.51M |
|
|
566
PUT
Duke Energy
DUK
$93.7B
| $20M | 0.01% |
169,100
+48,800
| +41% | +$5.76M |
|
567
CALL
Interactive Brokers
IBKR
$42B
| $19.9M | 0.01% |
359,000
-97,400
| -21% | -$4.62M |
|
568
PUT
Phillips 66
PSX
$102B
| $19.8M | 0.01% |
166,100
+18,700
| +13% | +$2.09M |
|
569
PUT
Shell
SHEL
$266B
| $19.8M | 0.01% |
281,400
+12,000
| +4% | +$804K |
|
570
Walmart Inc
WMT
$850B
| $19.8M | 0.01% |
202,277
+143,462
| +244% | +$13.7M |
|
571
CALL
General Dynamics
GD
$97.2B
| $19.5M | 0.01% |
66,900
-51,400
| -43% | -$14.1M |
|
|
WBA
572
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $19.5M | 0.01% |
1,694,900
-1,620,000
| -49% | -$18M |
|
573
CALL
Ulta Beauty
ULTA
$24.1B
| $19.4M | 0.01% |
41,500
-41,100
| -50% | -$17M |
|
574
CALL
Truist Financial
TFC
$63.1B
| $19.4M | 0.01% |
451,000
-4,500
| -1% | -$176K |
|
575
CALL
Las Vegas Sands
LVS
$28.7B
| $19.4M | 0.01% |
445,500
+61,200
| +16% | +$2.38M |
|
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's Q2 2025 filing shows 1,524 new, 3,308 increased, 3,590 reduced and 1,431 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $140M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Communication Services.
- 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 1,524 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.