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 | |
|---|---|---|---|---|---|---|
2976
PUT
iHeartMedia
IHRT
$535M
| $826K | ﹤0.01% |
469,700
-200
| -0% | -$266 |
|
2977
PUT
Western Union
WU
$2.57B
| $825K | ﹤0.01% |
98,000
+43,500
| +80% | +$413K |
|
2978
PENN Entertainment
PENN
$2.74B
| $824K | ﹤0.01% |
46,127
-254,431
| -85% | -$3.99M |
|
2979
Arcus Biosciences
RCUS
$3.57B
| $823K | ﹤0.01% |
101,200
+95,436
| +1,656% | +$815K |
|
2980
CALL
Verra Mobility
VRRM
$615M
| $822K | ﹤0.01% |
32,400
-8,100
| -20% | -$189K |
|
2981
PUT
GlobalFoundries
GFS
$29.4B
| $821K | ﹤0.01% |
21,500
-36,200
| -63% | -$1.31M |
|
2982
PUT
Navios Maritime Partners
NMM
$2.25B
| $821K | ﹤0.01% |
21,800
+12,600
| +137% | +$465K |
|
2983
CALL
Brookfield Renewable
BEPC
$6.12B
| $819K | ﹤0.01% |
25,000
-12,700
| -34% | -$371K |
|
2984
LegalZoom.com
LZ
$1.23B
| $819K | ﹤0.01% |
91,938
+133
| +0.1% | +$1.11K |
|
2985
CALL
Banco Santander
SAN
$194B
| $819K | ﹤0.01% |
98,700
+71,700
| +266% | +$533K |
|
2986
CALL
Sphere Entertainment
SPHR
$4.88B
| $819K | ﹤0.01% |
19,600
-154,100
| -89% | -$5.22M |
|
2987
PUT
Chemours
CC
$2.59B
| $817K | ﹤0.01% |
71,400
+8,600
| +14% | +$96.9K |
|
2988
PUT
Casey's General Stores
CASY
$31.9B
| $816K | ﹤0.01% |
1,600
-2,700
| -63% | -$1.24M |
|
2989
CALL
MSC Industrial Direct
MSM
$7.02B
| $816K | ﹤0.01% |
9,600
-6,100
| -39% | -$482K |
|
2990
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $816K | ﹤0.01% |
6,500
+2,800
| +76% | +$321K |
|
2991
CALL
Apogee Therapeutics
APGE
$10.2B
| $812K | ﹤0.01% |
18,700
+12,200
| +188% | +$464K |
|
2992
Host Hotels & Resorts
HST
$16.8B
| $812K | ﹤0.01% |
52,903
+42,638
| +415% | +$632K |
|
|
CALY
2993
CALL
Callaway Golf Company
CALY
$3.26B
| $811K | ﹤0.01% |
100,800
+42,400
| +73% | +$292K |
|
2994
CALL
Solventum
SOLV
$13.5B
| $811K | ﹤0.01% |
10,700
-36,500
| -77% | -$2.58M |
|
2995
BioNTech
BNTX
$22.6B
| $809K | ﹤0.01% |
+7,606
| New | +$768K |
|
2996
CALL
Douglas Emmett
DEI
$2.06B
| $809K | ﹤0.01% |
53,800
-87,200
| -62% | -$1.26M |
|
2997
Enphase Energy
ENPH
$4.84B
| $809K | ﹤0.01% |
20,413
-99,548
| -83% | -$4.6M |
|
2998
James Hardie Industries
JHX
$15.4B
| $809K | ﹤0.01% |
30,096
+24,632
| +451% | +$595K |
|
2999
CALL
Manhattan Associates
MANH
$8.97B
| $809K | ﹤0.01% |
4,100
-1,200
| -23% | -$218K |
|
3000
PUT
Paycom
PAYC
$6.78B
| $809K | ﹤0.01% |
3,500
-1,400
| -29% | -$332K |
|
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.