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 | |
|---|---|---|---|---|---|---|
701
CALL
APA Corp
APA
$12.8B
| $13.6M | 0.01% |
743,200
+39,200
| +6% | +$680K |
|
702
PUT
Las Vegas Sands
LVS
$30B
| $13.6M | 0.01% |
312,000
-54,500
| -15% | -$2.12M |
|
703
PUT
HCA Healthcare
HCA
$82.5B
| $13.6M | 0.01% |
35,400
-18,500
| -34% | -$6.67M |
|
704
CALL
American International
AIG
$41.5B
| $13.5M | 0.01% |
158,100
-30,700
| -16% | -$2.56M |
|
705
PUT
Zoetis
ZTS
$31.1B
| $13.5M | 0.01% |
86,600
+37,800
| +77% | +$5.99M |
|
706
PUT
D.R. Horton
DHI
$40B
| $13.4M | 0.01% |
104,000
+7,900
| +8% | +$973K |
|
707
PUT
Toast
TOST
$16.9B
| $13.4M | 0.01% |
301,700
+181,100
| +150% | +$7.12M |
|
708
CALL
Realty Income
O
$60.6B
| $13.3M | 0.01% |
231,200
-27,600
| -11% | -$1.56M |
|
709
PUT
Pultegroup
PHM
$24.1B
| $13.3M | 0.01% |
126,200
-10,800
| -8% | -$1.09M |
|
710
CALL
Linde
LIN
$235B
| $13.3M | 0.01% |
28,300
-14,300
| -34% | -$6.53M |
|
711
PUT
Unity
U
$12.8B
| $13.3M | 0.01% |
548,400
-237,900
| -30% | -$5.23M |
|
712
PUT
Ferrari
RACE
$65.4B
| $13.2M | 0.01% |
27,000
-20,600
| -43% | -$9.57M |
|
|
TIGR
713
PUT
UP Fintech Holding
TIGR
$897M
| $13.2M | 0.01% |
1,366,700
-484,500
| -26% | -$4.05M |
|
714
CALL
Caesars Entertainment
CZR
$6.1B
| $13.1M | 0.01% |
462,700
-92,000
| -17% | -$2.5M |
|
715
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $13.1M | 0.01% |
29,500
-34,400
| -54% | -$15.9M |
|
716
iShares Gold Trust
IAU
$64.2B
| $13.1M | 0.01% |
210,513
+52,081
| +33% | +$3.23M |
|
|
METD
717
CALL
Direxion Daily META Bear 1X ETF
METD
$8.11M
| $13.1M | 0.01% |
340,900
+107,200
| +46% | +$1.93M |
|
718
PUT
Fortinet
FTNT
$114B
| $13.1M | 0.01% |
124,000
-123,900
| -50% | -$12.5M |
|
719
PUT
American Tower
AMT
$77.4B
| $13.1M | 0.01% |
59,300
+15,300
| +35% | +$3.3M |
|
720
PUT
Twilio
TWLO
$27.8B
| $13.1M | 0.01% |
105,300
-107,700
| -51% | -$11.5M |
|
721
CALL
ProShares Ether Strategy ETF
EETH
$56.1M
| $13.1M | 0.01% |
440,200
+115,300
| +35% | +$4.69M |
|
722
CALL
MPLX
MPLX
$57.4B
| $13M | 0.01% |
253,200
-45,000
| -15% | -$2.29M |
|
723
SoundHound AI
SOUN
$2.81B
| $13M | 0.01% |
1,215,270
+873,282
| +255% | +$8.23M |
|
724
CALL
StoneCo
STNE
$2.76B
| $13M | 0.01% |
811,000
-154,800
| -16% | -$2.07M |
|
725
CALL
Marriott International
MAR
$97.5B
| $13M | 0.01% |
47,600
-7,700
| -14% | -$1.93M |
|
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.