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 | |
|---|---|---|---|---|---|---|
|
UROY
4051
Uranium Royalty Corp
UROY
$408M
| $304K | ﹤0.01% |
121,732
+95,956
| +372% | +$194K |
|
|
LINE
4052
PUT
Lineage Inc
LINE
$9.7B
| $304K | ﹤0.01% |
7,000
+3,900
| +126% | +$188K |
|
4053
Cerence
CRNC
$368M
| $303K | ﹤0.01% |
29,715
+15,966
| +116% | +$141K |
|
4054
PUT
Invesco DB Commodity Index Tracking Fund
DBC
$1.65B
| $303K | ﹤0.01% |
13,900
+13,600
| +4,533% | +$291K |
|
4055
PUT
Ero Copper
ERO
$2.67B
| $303K | ﹤0.01% |
18,000
+13,900
| +339% | +$188K |
|
4056
CALL
Eagle Materials
EXP
$6.86B
| $303K | ﹤0.01% |
1,500
-400
| -21% | -$86.2K |
|
4057
PUT
Getty Images
GETY
$171M
| $303K | ﹤0.01% |
183,100
-67,100
| -27% | -$118K |
|
4058
PUT
Black Hills Corp
BKH
$5.69B
| $302K | ﹤0.01% |
5,400
+2,200
| +69% | +$129K |
|
|
PPLI
4059
PUT
People Inc
PPLI
$3.13B
| $302K | ﹤0.01% |
8,100
-86,373
| -91% | -$3.12M |
|
4060
CALL
NCR Atleos
NATL
$3.47B
| $302K | ﹤0.01% |
10,600
+1,200
| +13% | +$32.4K |
|
|
RDUS
4061
DELISTED
Radius Recycling
RDUS
| $302K | ﹤0.01% |
10,182
+9,210
| +948% | +$270K |
|
4062
CALL
Gates Industrial Corporation Ltd.
GTES
$6.69B
| $301K | ﹤0.01% |
13,100
-21,000
| -62% | -$423K |
|
4063
PUT
Invitation Homes
INVH
$17.9B
| $301K | ﹤0.01% |
9,200
-1,500
| -14% | -$50.4K |
|
4064
Kinsale Capital Group
KNSL
$8.43B
| $301K | ﹤0.01% |
624
+227
| +57% | +$106K |
|
4065
CALL
Tecnoglass
TGLS
$2.09B
| $301K | ﹤0.01% |
3,900
-1,700
| -30% | -$132K |
|
4066
Editas Medicine
EDIT
$402M
| $300K | ﹤0.01% |
136,457
+2,290
| +2% | +$3.75K |
|
4067
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.43B
| $300K | ﹤0.01% |
23,600
+14,000
| +146% | +$169K |
|
4068
Wave Life Sciences
WVE
$1.13B
| $300K | ﹤0.01% |
46,230
+34,716
| +302% | +$229K |
|
4069
Direxion Daily FTSE China Bull 3X ETF
YINN
$729M
| $300K | ﹤0.01% |
+7,323
| New | +$262K |
|
|
ETNB
4070
CALL
DELISTED
89bio
ETNB
| $299K | ﹤0.01% |
30,500
-18,600
| -38% | -$154K |
|
4071
CALL
Health Catalyst
HCAT
$158M
| $299K | ﹤0.01% |
+79,400
| New | +$312K |
|
|
HTT
4072
CALL
High Templar Tech Ltd
HTT
$377M
| $299K | ﹤0.01% |
95,500
-7,900
| -8% | -$21.9K |
|
4073
Exelon
EXC
$48.4B
| $298K | ﹤0.01% |
+6,867
| New | +$306K |
|
4074
PUT
NewAmsterdam Pharma
NAMS
$3.27B
| $298K | ﹤0.01% |
16,500
-300
| -2% | -$5.47K |
|
4075
PUT
Vermilion Energy
VET
$1.59B
| $298K | ﹤0.01% |
41,000
-26,500
| -39% | -$181K |
|
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.