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 | |
|---|---|---|---|---|---|---|
676
PUT
BigBear.ai
BBAI
$1.38B
| $14.7M | 0.01% |
2,159,800
+500,500
| +30% | +$1.81M |
|
677
CALL
HP
HPQ
$23B
| $14.6M | 0.01% |
597,800
-5,200
| -0.9% | -$133K |
|
678
PUT
RH
RH
$3.31B
| $14.6M | 0.01% |
77,100
+16,400
| +27% | +$3.05M |
|
679
PUT
Williams Companies
WMB
$91.1B
| $14.5M | 0.01% |
231,600
-80,300
| -26% | -$4.74M |
|
680
CALL
DexCom
DXCM
$27.6B
| $14.5M | 0.01% |
165,900
+14,400
| +10% | +$1.13M |
|
681
PUT
Shake Shack
SHAK
$2.26B
| $14.5M | 0.01% |
103,000
+76,100
| +283% | +$8.29M |
|
682
CALL
Applied Digital
APLD
$8.6B
| $14.5M | 0.01% |
1,437,400
+362,400
| +34% | +$2.67M |
|
683
US Bancorp
USB
$100B
| $14.5M | 0.01% |
+319,512
| New | +$13.4M |
|
684
PUT
XPeng
XPEV
$12.3B
| $14.5M | 0.01% |
808,600
-490,300
| -38% | -$9.57M |
|
685
CALL
Eos Energy Enterprises
EOSE
$1.41B
| $14.4M | 0.01% |
2,813,500
+814,900
| +41% | +$3.99M |
|
686
State Street Industrial Select Sector SPDR ETF
XLI
$33.2B
| $14.4M | 0.01% |
+97,333
| New | +$13.3M |
|
|
687
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $14.3M | 0.01% |
315,400
-177,600
| -36% | -$3.71M |
|
688
CALL
Cardinal Health
CAH
$51.7B
| $14.2M | 0.01% |
84,800
-14,500
| -15% | -$2.15M |
|
689
CALL
Centrus Energy
LEU
$3.43B
| $14.2M | 0.01% |
77,600
+48,400
| +166% | +$5.17M |
|
|
FISV
690
PUT
Fiserv Inc
FISV
$26.8B
| $14.1M | 0.01% |
81,800
+9,800
| +14% | +$1.78M |
|
691
CALL
Sunrun
RUN
$2.61B
| $14.1M | 0.01% |
1,721,800
+888,500
| +107% | +$6.99M |
|
692
CALL
EQT Corp
EQT
$33.8B
| $14M | 0.01% |
240,200
-126,700
| -35% | -$6.84M |
|
|
693
PUT
Applied Digital
APLD
$8.6B
| $14M | 0.01% |
1,388,600
+560,600
| +68% | +$4.14M |
|
694
CALL
Akamai
AKAM
$18.1B
| $13.9M | 0.01% |
174,500
-94,900
| -35% | -$7.37M |
|
695
PUT
CSX Corp
CSX
$92.8B
| $13.9M | 0.01% |
425,000
+359,100
| +545% | +$10.8M |
|
696
CALL
Lyft
LYFT
$5.57B
| $13.9M | 0.01% |
879,200
-446,100
| -34% | -$6.25M |
|
697
PUT
Simon Property Group
SPG
$73.4B
| $13.8M | 0.01% |
86,000
-26,900
| -24% | -$4.25M |
|
698
CALL
Regeneron Pharmaceuticals
REGN
$68.3B
| $13.7M | 0.01% |
26,000
+4,600
| +21% | +$2.57M |
|
699
CALL
Global Payments
GPN
$21.6B
| $13.6M | 0.01% |
170,300
+44,100
| +35% | +$3.49M |
|
700
CALL
Wynn Resorts
WYNN
$9.79B
| $13.6M | 0.01% |
145,500
-1,000
| -0.7% | -$84.9K |
|
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.