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 | |
|---|---|---|---|---|---|---|
|
PR
2551
Permian Resources
PR
$17.9B
| $1.25M | ﹤0.01% |
91,499
-16,116
| -15% | -$207K |
|
2552
PUT
Allot
ALLT
$374M
| $1.24M | ﹤0.01% |
145,300
-6,200
| -4% | -$44.6K |
|
|
CNH
2553
CALL
CNH Industrial
CNH
$13.8B
| $1.24M | ﹤0.01% |
95,900
-33,500
| -26% | -$414K |
|
2554
CALL
EPR Properties
EPR
$4.86B
| $1.24M | ﹤0.01% |
21,300
-1,900
| -8% | -$100K |
|
2555
PUT
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.9B
| $1.24M | ﹤0.01% |
46,200
-31,900
| -41% | -$827K |
|
2556
PUT
Ormat Technologies
ORA
$6.11B
| $1.24M | ﹤0.01% |
+14,800
| New | +$1.11M |
|
2557
CALL
Arch Capital
ACGL
$36.1B
| $1.24M | ﹤0.01% |
13,600
+2,700
| +25% | +$249K |
|
2558
PUT
Alamos Gold
AGI
$12.4B
| $1.24M | ﹤0.01% |
46,600
-6,100
| -12% | -$163K |
|
2559
CALL
Northern Oil and Gas
NOG
$2.3B
| $1.24M | ﹤0.01% |
43,600
-21,300
| -33% | -$573K |
|
2560
CALL
Watsco Inc
WSO
$14.9B
| $1.24M | ﹤0.01% |
2,800
+2,400
| +600% | +$1.11M |
|
2561
CALL
Targa Resources
TRGP
$60.4B
| $1.24M | ﹤0.01% |
7,100
-26,700
| -79% | -$4.48M |
|
|
TWO
2562
CALL
Two Harbors Investment
TWO
$1.27B
| $1.24M | ﹤0.01% |
114,700
+79,800
| +229% | +$899K |
|
2563
Abercrombie & Fitch
ANF
$4.17B
| $1.23M | ﹤0.01% |
14,904
-2,919
| -16% | -$221K |
|
2564
PUT
Sturm, Ruger & Co
RGR
$610M
| $1.23M | ﹤0.01% |
34,400
-3,100
| -8% | -$115K |
|
2565
CALL
Lightbridge
LTBR
$246M
| $1.23M | ﹤0.01% |
92,100
+20,200
| +28% | +$223K |
|
2566
PUT
NOV
NOV
$7.45B
| $1.23M | ﹤0.01% |
99,100
-11,300
| -10% | -$142K |
|
2567
CALL
Tidewater
TDW
$3.91B
| $1.23M | ﹤0.01% |
26,700
-30,100
| -53% | -$1.22M |
|
2568
PUT
AdaptHealth
AHCO
$1.46B
| $1.23M | ﹤0.01% |
130,300
-167,100
| -56% | -$1.47M |
|
2569
PUT
Sinclair Inc
SBGI
$974M
| $1.23M | ﹤0.01% |
88,900
+84,100
| +1,752% | +$1.2M |
|
2570
PUT
Atlanta Braves Holdings Series B
BATRK
$3.23B
| $1.23M | ﹤0.01% |
26,200
+25,500
| +3,643% | +$1.04M |
|
2571
PUT
Ventas
VTR
$48.9B
| $1.23M | ﹤0.01% |
19,400
-75,800
| -80% | -$4.95M |
|
2572
PUT
New Oriental
EDU
$7.84B
| $1.22M | ﹤0.01% |
22,700
-5,600
| -20% | -$266K |
|
2573
CALL
Canadian Solar
CSIQ
$906M
| $1.22M | ﹤0.01% |
110,800
-3,900
| -3% | -$37.7K |
|
2574
CALL
Huntsman Corp
HUN
$2.24B
| $1.22M | ﹤0.01% |
117,400
+15,800
| +16% | +$193K |
|
2575
PUT
ODDITY Tech
ODD
$708M
| $1.22M | ﹤0.01% |
16,200
+14,100
| +671% | +$860K |
|
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.