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 | |
|---|---|---|---|---|---|---|
1076
CALL
CarMax
KMX
$8.29B
| $7.41M | ﹤0.01% |
110,200
-23,300
| -17% | -$1.57M |
|
1077
CALL
ZIM Integrated Shipping Services
ZIM
$3.08B
| $7.4M | ﹤0.01% |
459,800
-229,100
| -33% | -$3.61M |
|
1078
PUT
Southern Company
SO
$109B
| $7.38M | ﹤0.01% |
80,400
-42,600
| -35% | -$3.83M |
|
1079
PUT
Fluor
FLR
$7.44B
| $7.36M | ﹤0.01% |
143,600
+78,400
| +120% | +$3.13M |
|
1080
CALL
Paychex
PAYX
$39.4B
| $7.36M | ﹤0.01% |
50,600
-11,900
| -19% | -$1.79M |
|
1081
CALL
VF Corp
VFC
$6.49B
| $7.35M | ﹤0.01% |
625,600
+311,100
| +99% | +$3.86M |
|
1082
CALL
Canadian National Railway
CNI
$79.2B
| $7.33M | ﹤0.01% |
70,500
+34,400
| +95% | +$3.5M |
|
1083
PUT
Lamb Weston
LW
$6.79B
| $7.32M | ﹤0.01% |
141,100
-62,100
| -31% | -$3.33M |
|
1084
PUT
Hershey
HSY
$34.9B
| $7.29M | ﹤0.01% |
43,900
-58,000
| -57% | -$9.56M |
|
1085
CALL
International Paper
IP
$20.1B
| $7.28M | ﹤0.01% |
155,500
-131,700
| -46% | -$6.23M |
|
1086
PUT
Alnylam Pharmaceuticals
ALNY
$35.9B
| $7.27M | ﹤0.01% |
22,300
-27,600
| -55% | -$7.64M |
|
1087
CALL
Sanmina
SANM
$11.7B
| $7.27M | ﹤0.01% |
+74,300
| New | +$6.14M |
|
1088
PUT
Rocket Companies
RKT
$36.2B
| $7.27M | ﹤0.01% |
512,500
+386,900
| +308% | +$5.02M |
|
1089
PUT
NXP Semiconductors
NXPI
$70B
| $7.25M | ﹤0.01% |
33,200
-26,300
| -44% | -$5.14M |
|
1090
PUT
SiriusXM
SIRI
$10.1B
| $7.22M | ﹤0.01% |
314,400
+189,800
| +152% | +$4.08M |
|
1091
PUT
Darling Ingredients
DAR
$10.1B
| $7.21M | ﹤0.01% |
190,000
+30,700
| +19% | +$1.01M |
|
1092
Vertiv
VRT
$117B
| $7.2M | ﹤0.01% |
+56,103
| New | +$5.46M |
|
1093
ARK 21Shares Bitcoin ETF
ARKB
$2.47B
| $7.19M | ﹤0.01% |
200,964
+18,444
| +10% | +$605K |
|
|
BPMC
1094
DELISTED
Blueprint Medicines
BPMC
| $7.18M | ﹤0.01% |
55,989
+51,285
| +1,090% | +$5.33M |
|
1095
PUT
Boston Properties
BXP
$10.8B
| $7.17M | ﹤0.01% |
106,200
+46,500
| +78% | +$3.1M |
|
1096
CALL
Alexandria Real Estate Equities
ARE
$8.73B
| $7.16M | ﹤0.01% |
98,600
+68,700
| +230% | +$5.1M |
|
1097
CALL
Nextpower Inc
NXT
$15.8B
| $7.14M | ﹤0.01% |
131,400
+60,200
| +85% | +$3.02M |
|
1098
PUT
Noble Corp
NE
$6.88B
| $7.11M | ﹤0.01% |
267,900
+183,400
| +217% | +$4.4M |
|
1099
PUT
Saia
SAIA
$11.3B
| $7.1M | ﹤0.01% |
25,900
+21,500
| +489% | +$6.13M |
|
|
FL
1100
PUT
DELISTED
Foot Locker
FL
| $7.09M | ﹤0.01% |
289,400
-26,700
| -8% | -$485K |
|
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.