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 | |
|---|---|---|---|---|---|---|
426
PUT
Cigna
CI
$75.4B
| $29.4M | 0.02% |
88,800
-24,300
| -21% | -$7.83M |
|
427
CALL
PG&E
PCG
$39.9B
| $29.2M | 0.02% |
2,095,700
+434,700
| +26% | +$7.07M |
|
428
PUT
Sea Limited
SE
$64.2B
| $29.1M | 0.02% |
181,900
-200,200
| -52% | -$29M |
|
429
CALL
CAVA Group
CAVA
$7.26B
| $29.1M | 0.02% |
345,300
+128,000
| +59% | +$10.9M |
|
430
PUT
Interactive Brokers
IBKR
$41.7B
| $29M | 0.02% |
522,600
+121,000
| +30% | +$5.74M |
|
431
PUT
Proshares UltraShort Technology
REW
$3.3M
| $28.9M | 0.02% |
352,275
-111,800
| -24% | -$4.52M |
|
432
CALL
NuScale Power
SMR
$3B
| $28.9M | 0.02% |
729,800
+121,700
| +20% | +$3.05M |
|
433
PUT
DexCom
DXCM
$27.6B
| $28.8M | 0.02% |
330,200
+117,300
| +55% | +$9.19M |
|
434
CALL
Dick's Sporting Goods
DKS
$18.8B
| $28.8M | 0.02% |
145,700
+102,500
| +237% | +$19M |
|
435
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $28.7M | 0.02% |
633,900
+315,300
| +99% | +$36.6M |
|
436
CALL
Capital One
COF
$124B
| $28.7M | 0.02% |
134,900
-166,100
| -55% | -$31M |
|
437
CALL
CleanSpark
CLSK
$3.93B
| $28.3M | 0.02% |
2,564,400
-660,000
| -20% | -$5.88M |
|
438
Robinhood
HOOD
$93.8B
| $28.2M | 0.02% |
301,109
+201,736
| +203% | +$11.9M |
|
439
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $28.1M | 0.02% |
433,600
+342,700
| +377% | +$15.4M |
|
440
PUT
Thermo Fisher Scientific
TMO
$196B
| $28M | 0.02% |
69,100
+21,400
| +45% | +$8.95M |
|
441
CALL
Howmet Aerospace
HWM
$112B
| $28M | 0.02% |
150,400
+16,600
| +12% | +$2.55M |
|
442
CALL
Deckers Outdoor
DECK
$14.2B
| $28M | 0.02% |
271,500
-110,600
| -29% | -$12.2M |
|
443
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $27.9M | 0.02% |
616,300
+325,600
| +112% | +$6.8M |
|
444
PUT
Marriott International
MAR
$97.5B
| $27.9M | 0.02% |
102,000
+46,700
| +84% | +$11.7M |
|
445
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$108M
| $27.8M | 0.02% |
1,010,300
-329,300
| -25% | -$8.51M |
|
446
PUT
3M
MMM
$89.1B
| $27.8M | 0.02% |
244,800
+16,000
| +7% | +$2.29M |
|
447
PUT
Deere & Co
DE
$164B
| $27.8M | 0.02% |
54,600
-30,500
| -36% | -$14.9M |
|
448
PUT
Enphase Energy
ENPH
$5.22B
| $27.7M | 0.02% |
698,600
+332,600
| +91% | +$15.4M |
|
449
iShares MSCI Brazil ETF
EWZ
$9.27B
| $27.6M | 0.02% |
955,457
+869,110
| +1,007% | +$23.5M |
|
450
PUT
Lowe's Companies
LOW
$115B
| $27.5M | 0.02% |
172,000
+25,000
| +17% | +$5.58M |
|
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.