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 | |
|---|---|---|---|---|---|---|
2876
CALL
Rapid7
RPD
$634M
| $904K | ﹤0.01% |
39,100
+30,300
| +344% | +$718K |
|
2877
Corebridge Financial
CRBG
$14.1B
| $901K | ﹤0.01% |
25,386
-17,090
| -40% | -$531K |
|
2878
CALL
Corteva
CTVA
$59.7B
| $901K | ﹤0.01% |
12,100
-16,500
| -58% | -$1.1M |
|
2879
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $900K | ﹤0.01% |
1,590
+888
| +126% | +$477K |
|
2880
HEICO Corp
HEI
$48.9B
| $899K | ﹤0.01% |
+2,741
| New | +$758K |
|
2881
PUT
LPL Financial
LPLA
$26.3B
| $899K | ﹤0.01% |
2,400
-15,500
| -87% | -$5.43M |
|
2882
CALL
Penumbra
PEN
$12.5B
| $898K | ﹤0.01% |
3,500
+2,400
| +218% | +$653K |
|
|
BTC
2883
CALL
Grayscale Bitcoin Mini Trust ETF
BTC
$3.4B
| $897K | ﹤0.01% |
18,800
-2,600
| -12% | -$114K |
|
2884
PUT
Fox Class B
FOX
$20.7B
| $896K | ﹤0.01% |
16,000
-97,700
| -86% | -$4.76M |
|
2885
uniQure
QURE
$2.68B
| $895K | ﹤0.01% |
64,259
+16,735
| +35% | +$225K |
|
2886
CALL
Brookfield Infrastructure Partners
BIP
$18.8B
| $894K | ﹤0.01% |
26,700
-16,000
| -37% | -$502K |
|
2887
FTAI Infrastructure
FIP
$500M
| $894K | ﹤0.01% |
+144,919
| New | +$734K |
|
2888
CALL
Delek Logistics
DKL
$3.04B
| $893K | ﹤0.01% |
20,800
-5,100
| -20% | -$207K |
|
2889
Sturm, Ruger & Co
RGR
$610M
| $893K | ﹤0.01% |
24,875
+9,686
| +64% | +$360K |
|
2890
PUT
Global E Online
GLBE
$6.08B
| $892K | ﹤0.01% |
26,600
-3,500
| -12% | -$118K |
|
2891
CALL
Melco Resorts & Entertainment
MLCO
$2.1B
| $892K | ﹤0.01% |
123,500
-149,700
| -55% | -$870K |
|
2892
CALL
Evercore
EVR
$13.1B
| $891K | ﹤0.01% |
3,300
+400
| +14% | +$88K |
|
2893
CALL
Rollins
ROL
$18.6B
| $891K | ﹤0.01% |
15,800
-4,900
| -24% | -$275K |
|
2894
CALL
Brookfield Renewable
BEP
$10B
| $890K | ﹤0.01% |
34,900
-11,900
| -25% | -$280K |
|
2895
Annaly Capital Management
NLY
$16.9B
| $890K | ﹤0.01% |
+47,304
| New | +$899K |
|
|
SMST
2896
PUT
Defiance Daily Target 2x Short MSTR ETF
SMST
$33.7M
| $890K | ﹤0.01% |
+37,200
| New | +$1.35M |
|
|
KALV
2897
CALL
DELISTED
KalVista Pharmaceuticals
KALV
| $889K | ﹤0.01% |
78,700
-40,400
| -34% | -$494K |
|
2898
PUT
Apple Hospitality REIT
APLE
$3.96B
| $888K | ﹤0.01% |
76,100
+39,900
| +110% | +$468K |
|
2899
PUT
Replimune Group
REPL
$814M
| $886K | ﹤0.01% |
95,400
+40,500
| +74% | +$353K |
|
2900
Vermilion Energy
VET
$1.73B
| $886K | ﹤0.01% |
121,745
+41,567
| +52% | +$284K |
|
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.