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 | |
|---|---|---|---|---|---|---|
801
CALL
Booz Allen Hamilton
BAH
$8.09B
| $11.6M | 0.01% |
111,700
+78,100
| +232% | +$8.75M |
|
802
PUT
Coupang
CPNG
$27.8B
| $11.6M | 0.01% |
388,000
+141,700
| +58% | +$3.63M |
|
803
CALL
Stanley Black & Decker
SWK
$13.7B
| $11.6M | 0.01% |
170,900
+99,200
| +138% | +$6.4M |
|
804
PUT
Coherent
COHR
$62.8B
| $11.6M | 0.01% |
129,500
+40,500
| +46% | +$2.91M |
|
805
PUT
Marathon Petroleum
MPC
$93.5B
| $11.5M | 0.01% |
69,100
-89,500
| -56% | -$13.4M |
|
806
CALL
Aflac
AFL
$62.9B
| $11.5M | 0.01% |
108,700
+5,400
| +5% | +$567K |
|
807
Newmont
NEM
$101B
| $11.4M | 0.01% |
196,522
-131,879
| -40% | -$7.04M |
|
808
CALL
Intercontinental Exchange
ICE
$81B
| $11.4M | 0.01% |
62,400
-12,600
| -17% | -$2.17M |
|
809
PUT
Darden Restaurants
DRI
$22.1B
| $11.4M | 0.01% |
52,500
-1,200
| -2% | -$249K |
|
810
CALL
Cenovus Energy
CVE
$55.8B
| $11.4M | 0.01% |
841,200
+230,000
| +38% | +$2.99M |
|
|
FLG
811
CALL
Flagstar Bank National Association
FLG
$6.07B
| $11.4M | 0.01% |
1,076,700
-36,400
| -3% | -$416K |
|
812
PUT
Antero Resources
AR
$11.2B
| $11.4M | 0.01% |
283,000
+78,900
| +39% | +$2.99M |
|
|
TIGR
813
CALL
UP Fintech Holding
TIGR
$870M
| $11.4M | 0.01% |
1,179,200
-108,800
| -8% | -$909K |
|
814
PUT
Elevance Health
ELV
$82.5B
| $11.3M | 0.01% |
29,000
-39,100
| -57% | -$15.7M |
|
815
CALL
ProShares Ultra S&P500
SSO
$7.83B
| $11.2M | 0.01% |
207,400
+22,400
| +12% | +$946K |
|
816
PUT
Toll Brothers
TOL
$13.6B
| $11.2M | 0.01% |
98,500
+71,100
| +259% | +$7.38M |
|
817
PUT
Matador Resources
MTDR
$6.69B
| $11.2M | 0.01% |
235,500
+109,700
| +87% | +$4.84M |
|
818
PUT
Danaher
DHR
$130B
| $11.2M | 0.01% |
56,700
-66,600
| -54% | -$12.9M |
|
819
PG&E
PCG
$39.2B
| $11.2M | 0.01% |
+799,868
| New | +$13M |
|
820
CALL
Royal Bank of Canada
RY
$289B
| $11.1M | 0.01% |
84,300
+20,300
| +32% | +$2.48M |
|
821
PUT
Teva Pharmaceuticals
TEVA
$35.5B
| $11.1M | 0.01% |
661,100
-68,200
| -9% | -$1.1M |
|
822
CALL
United Rentals
URI
$72.6B
| $11.1M | 0.01% |
14,700
-16,100
| -52% | -$10.8M |
|
823
CALL
BCE
BCE
$19.8B
| $11.1M | 0.01% |
499,400
-23,800
| -5% | -$521K |
|
824
PUT
Hertz
HTZ
$632M
| $11.1M | 0.01% |
1,620,600
+471,100
| +41% | +$2.94M |
|
825
CALL
Cintas
CTAS
$81.2B
| $11.1M | 0.01% |
49,600
+30,500
| +160% | +$6.57M |
|
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.