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 | |
|---|---|---|---|---|---|---|
|
GLDD
2851
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
| $932K | ﹤0.01% |
+76,500
| New | +$795K |
|
2852
Stride
LRN
$3.69B
| $932K | ﹤0.01% |
6,424
-400
| -6% | -$57.9K |
|
|
UNIT
2853
Uniti Group
UNIT
$2.63B
| $931K | ﹤0.01% |
215,674
+151,106
| +234% | +$679K |
|
2854
PUT
Corpay
CPAY
$24.2B
| $929K | ﹤0.01% |
+2,800
| New | +$913K |
|
2855
American Eagle Outfitters
AEO
$2.85B
| $927K | ﹤0.01% |
96,397
+76,367
| +381% | +$820K |
|
2856
PUT
Aon
AON
$77.3B
| $927K | ﹤0.01% |
2,600
-12,600
| -83% | -$4.57M |
|
2857
Yum China
YUMC
$14.9B
| $927K | ﹤0.01% |
+20,751
| New | +$928K |
|
2858
Bank of America
BAC
$435B
| $926K | ﹤0.01% |
+19,583
| New | +$824K |
|
2859
PUT
Blue Bird Corp
BLBD
$2.41B
| $923K | ﹤0.01% |
21,400
-13,800
| -39% | -$525K |
|
2860
Church & Dwight Co
CHD
$23.1B
| $923K | ﹤0.01% |
9,608
+8,878
| +1,216% | +$876K |
|
2861
PUT
Copa Holdings
CPA
$5.56B
| $923K | ﹤0.01% |
8,400
-5,100
| -38% | -$503K |
|
2862
PUT
MSCI
MSCI
$40B
| $922K | ﹤0.01% |
1,600
-200
| -11% | -$111K |
|
2863
PUT
TC Energy
TRP
$73.5B
| $922K | ﹤0.01% |
18,900
+9,700
| +105% | +$476K |
|
2864
Union Pacific
UNP
$183B
| $922K | ﹤0.01% |
4,010
+1,547
| +63% | +$343K |
|
2865
Upwork
UPWK
$1.09B
| $921K | ﹤0.01% |
68,599
+11,880
| +21% | +$171K |
|
2866
CALL
Globe Life
GL
$13.5B
| $919K | ﹤0.01% |
7,400
-8,000
| -52% | -$971K |
|
2867
PUT
Flex
FLEX
$43.4B
| $918K | ﹤0.01% |
18,800
+9,900
| +111% | +$386K |
|
|
ETH
2868
Grayscale Ethereum Staking Mini ETF Shares
ETH
$1.7B
| $918K | ﹤0.01% |
+38,733
| New | +$801K |
|
2869
PUT
First Interstate BancSystem
FIBK
$3.7B
| $913K | ﹤0.01% |
+31,700
| New | +$854K |
|
2870
PUT
FreightCar America
RAIL
$275M
| $912K | ﹤0.01% |
105,900
+105,700
| +52,850% | +$736K |
|
|
VERV
2871
DELISTED
Verve Therapeutics
VERV
| $911K | ﹤0.01% |
81,129
+68,549
| +545% | +$391K |
|
2872
PUT
Corteva
CTVA
$59.7B
| $909K | ﹤0.01% |
12,200
+4,800
| +65% | +$320K |
|
2873
CALL
Trinity Capital
TRIN
$1.55B
| $906K | ﹤0.01% |
64,400
+22,600
| +54% | +$326K |
|
2874
Arrowhead Research
ARWR
$12.1B
| $905K | ﹤0.01% |
57,307
+215
| +0.4% | +$3.08K |
|
2875
CALL
Cognex
CGNX
$10.3B
| $904K | ﹤0.01% |
28,500
-5,200
| -15% | -$149K |
|
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.