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 | |
|---|---|---|---|---|---|---|
976
CALL
BILL Holdings
BILL
$4.11B
| $8.7M | 0.01% |
188,000
+12,100
| +7% | +$535K |
|
977
CALL
Kinross Gold
KGC
$28.3B
| $8.69M | 0.01% |
556,300
+134,600
| +32% | +$1.96M |
|
978
PUT
GeneDx Holdings
WGS
$1.88B
| $8.68M | 0.01% |
94,000
+88,900
| +1,743% | +$6.98M |
|
979
CALL
Fidelity National Information Services
FIS
$20.7B
| $8.67M | 0.01% |
106,500
+28,900
| +37% | +$2.25M |
|
980
CALL
UiPath
PATH
$5.28B
| $8.65M | 0.01% |
675,800
-267,800
| -28% | -$3.21M |
|
981
CALL
Leidos
LDOS
$13.9B
| $8.64M | 0.01% |
54,800
+10,900
| +25% | +$1.61M |
|
982
PUT
CarMax
KMX
$8.29B
| $8.64M | ﹤0.01% |
128,500
+20,400
| +19% | +$1.37M |
|
983
PUT
Pan American Silver
PAAS
$18.6B
| $8.62M | ﹤0.01% |
303,500
+5,700
| +2% | +$148K |
|
984
PUT
Paychex
PAYX
$39.4B
| $8.6M | ﹤0.01% |
59,100
-21,600
| -27% | -$3.25M |
|
985
PUT
Corning
GLW
$134B
| $8.59M | ﹤0.01% |
163,400
-89,400
| -35% | -$4.19M |
|
986
CALL
NextNav
NN
$1.73B
| $8.59M | ﹤0.01% |
593,100
-10,900
| -2% | -$140K |
|
987
CALL
Edwards Lifesciences
EW
$48.3B
| $8.59M | ﹤0.01% |
109,800
-169,500
| -61% | -$12.6M |
|
988
CALL
Novartis
NVS
$297B
| $8.58M | ﹤0.01% |
70,900
-5,000
| -7% | -$564K |
|
989
CALL
Genuine Parts
GPC
$16.6B
| $8.58M | ﹤0.01% |
70,700
+24,000
| +51% | +$2.89M |
|
|
DOCU
990
CALL
DocuSign
DOCU
$8.98B
| $8.57M | ﹤0.01% |
110,000
-27,900
| -20% | -$2.26M |
|
991
PUT
Akamai
AKAM
$17.1B
| $8.57M | ﹤0.01% |
107,400
-131,000
| -55% | -$10.2M |
|
|
992
Amazon
AMZN
$2.51T
| $8.55M | ﹤0.01% |
38,978
-242,180
| -86% | -$47.9M |
|
993
PUT
VF Corp
VFC
$6.49B
| $8.54M | ﹤0.01% |
726,700
+440,600
| +154% | +$5.46M |
|
994
PUT
KLA
KLAC
$286B
| $8.51M | ﹤0.01% |
95,000
+11,000
| +13% | +$828K |
|
995
CALL
Citizens Financial Group
CFG
$30.3B
| $8.51M | ﹤0.01% |
190,100
+97,000
| +104% | +$3.82M |
|
996
PUT
Cadence Design Systems
CDNS
$91.1B
| $8.5M | ﹤0.01% |
27,600
-38,100
| -58% | -$11.1M |
|
997
PUT
General Dynamics
GD
$103B
| $8.49M | ﹤0.01% |
29,100
-5,200
| -15% | -$1.43M |
|
998
PUT
Jabil
JBL
$33.7B
| $8.46M | ﹤0.01% |
38,800
+3,800
| +11% | +$616K |
|
999
CALL
KE Holdings
BEKE
$17.8B
| $8.46M | ﹤0.01% |
476,700
-168,200
| -26% | -$3.24M |
|
1000
PUT
United Rentals
URI
$71.4B
| $8.44M | ﹤0.01% |
11,200
-14,700
| -57% | -$9.83M |
|
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.