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 | |
|---|---|---|---|---|---|---|
|
SKX
1701
PUT
DELISTED
Skechers
SKX
| $3.24M | ﹤0.01% |
51,300
-17,200
| -25% | -$988K |
|
1702
PUT
Guardant Health
GH
$19.5B
| $3.24M | ﹤0.01% |
62,200
-17,700
| -22% | -$791K |
|
1703
Teva Pharmaceuticals
TEVA
$35.9B
| $3.23M | ﹤0.01% |
192,990
-223,773
| -54% | -$3.61M |
|
1704
PUT
Republic Services
RSG
$66.7B
| $3.23M | ﹤0.01% |
13,100
+11,100
| +555% | +$2.74M |
|
1705
CALL
Allstate
ALL
$66.9B
| $3.22M | ﹤0.01% |
16,000
-13,500
| -46% | -$2.69M |
|
1706
CALL
Altimmune
ALT
$539M
| $3.22M | ﹤0.01% |
832,100
+478,900
| +136% | +$2.59M |
|
1707
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $3.22M | ﹤0.01% |
29,600
+18,700
| +172% | +$1.96M |
|
1708
PUT
GFL Environmental
GFL
$14.3B
| $3.21M | ﹤0.01% |
63,700
+37,400
| +142% | +$1.84M |
|
1709
CALL
BioMarin Pharmaceuticals
BMRN
$11.5B
| $3.2M | ﹤0.01% |
58,300
+13,400
| +30% | +$789K |
|
1710
CALL
M&T Bank
MTB
$36.2B
| $3.18M | ﹤0.01% |
16,400
-9,500
| -37% | -$1.68M |
|
1711
NuScale Power
SMR
$2.8B
| $3.18M | ﹤0.01% |
80,374
-175,874
| -69% | -$4.41M |
|
1712
PUT
Cummins
CMI
$91.7B
| $3.18M | ﹤0.01% |
9,700
-2,000
| -17% | -$619K |
|
|
MRSH
1713
CALL
Marsh
MRSH
$86.3B
| $3.17M | ﹤0.01% |
14,500
+2,600
| +22% | +$587K |
|
1714
Campbell Soup
CPB
$6.51B
| $3.16M | ﹤0.01% |
103,255
+102,280
| +10,490% | +$3.6M |
|
1715
GXO Logistics
GXO
$6.06B
| $3.16M | ﹤0.01% |
64,894
+2,626
| +4% | +$105K |
|
1716
CALL
Skyworks Solutions
SWKS
$9.06B
| $3.16M | ﹤0.01% |
42,400
-109,500
| -72% | -$7.31M |
|
1717
CALL
Zoetis
ZTS
$31.6B
| $3.15M | ﹤0.01% |
20,200
-26,100
| -56% | -$4.14M |
|
|
EXAS
1718
PUT
DELISTED
Exact Sciences
EXAS
| $3.14M | ﹤0.01% |
59,100
+24,700
| +72% | +$1.25M |
|
|
FISV
1719
Fiserv Inc
FISV
$27.2B
| $3.14M | ﹤0.01% |
18,199
+526
| +3% | +$95.4K |
|
|
NVMI
1720
PUT
Nova
NVMI
$13.9B
| $3.14M | ﹤0.01% |
11,400
-9,900
| -46% | -$2.01M |
|
1721
CALL
Lumentum
LITE
$59.4B
| $3.14M | ﹤0.01% |
33,000
-1,100
| -3% | -$78.1K |
|
1722
Zscaler
ZS
$23B
| $3.13M | ﹤0.01% |
9,988
-21,259
| -68% | -$5.3M |
|
1723
PUT
Imperial Oil
IMO
$62.1B
| $3.13M | ﹤0.01% |
39,400
-3,500
| -8% | -$250K |
|
1724
CALL
Wingstop
WING
$3.68B
| $3.13M | ﹤0.01% |
9,300
-1,400
| -13% | -$414K |
|
|
LAZR
1725
CALL
DELISTED
Luminar Technologies
LAZR
| $3.13M | ﹤0.01% |
1,090,000
-118,200
| -10% | -$449K |
|
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.