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 | |
|---|---|---|---|---|---|---|
6001
Ardagh Metal Packaging
AMBP
$2.96B
| $46K | ﹤0.01% |
10,795
-16,944
| -61% | -$61.4K |
|
6002
PUT
Arhaus
ARHS
$1.07B
| $46K | ﹤0.01% |
5,400
+4,300
| +391% | +$35.9K |
|
6003
CALL
DMC Global
BOOM
$111M
| $46K | ﹤0.01% |
5,800
-1,700
| -23% | -$12K |
|
6004
CALL
Establishment Labs
ESTA
$2.71B
| $46K | ﹤0.01% |
1,100
-48,700
| -98% | -$1.7M |
|
6005
PUT
Goldgroup Mining Inc.
GORO
$155M
| $46K | ﹤0.01% |
76,600
+56,400
| +279% | +$30.7K |
|
6006
Helix Energy Solutions
HLX
$1.34B
| $46K | ﹤0.01% |
7,479
-44,615
| -86% | -$295K |
|
6007
PUT
Horizon Technology Finance
HRZN
$294M
| $46K | ﹤0.01% |
6,400
+1,500
| +31% | +$11.7K |
|
6008
International Seaways
INSW
$4.68B
| $46K | ﹤0.01% |
1,286
-1,289
| -50% | -$46.2K |
|
6009
CALL
Liberty Latin America Class C
LILAK
$1.69B
| $46K | ﹤0.01% |
8,360
-1,100
| -12% | -$5.39K |
|
6010
CALL
Palomar
PLMR
$3.79B
| $46K | ﹤0.01% |
300
| – | – |
|
6011
Sky Harbour Group
SKYH
$363M
| $46K | ﹤0.01% |
4,714
+1,696
| +56% | +$18.3K |
|
|
TRTX
6012
CALL
TPG RE Finance Trust
TRTX
$630M
| $46K | ﹤0.01% |
6,000
+2,100
| +54% | +$16K |
|
6013
CALL
Village Farms International
VFF
$240M
| $46K | ﹤0.01% |
+42,600
| New | +$37.7K |
|
|
ATYR
6014
aTyr Pharma
ATYR
$47.4M
| $46K | ﹤0.01% |
9,203
-87,649
| -90% | -$345K |
|
6015
PUT
A.O. Smith
AOS
$8.55B
| $45K | ﹤0.01% |
700
-5,100
| -88% | -$334K |
|
6016
Aviat Networks
AVNW
$253M
| $45K | ﹤0.01% |
1,874
-9,920
| -84% | -$200K |
|
6017
Black Stone Minerals
BSM
$3.14B
| $45K | ﹤0.01% |
+3,513
| New | +$48.6K |
|
6018
CALL
BuzzFeed
BZFD
$99M
| $45K | ﹤0.01% |
22,900
+13,000
| +131% | +$25.7K |
|
6019
PUT
Cardlytics
CDLX
$22.2M
| $45K | ﹤0.01% |
2,790
+2,510
| +896% | +$43.3K |
|
6020
CALL
Golub Capital BDC
GBDC
$3.33B
| $45K | ﹤0.01% |
3,100
-3,500
| -53% | -$51K |
|
6021
CALL
Gevo
GEVO
$353M
| $45K | ﹤0.01% |
34,500
-237,200
| -87% | -$278K |
|
6022
PUT
Gossamer Bio
GOSS
$101M
| $45K | ﹤0.01% |
36,600
+100
| +0.3% | +$109 |
|
6023
CALL
Intellicheck
IDN
$75.1M
| $45K | ﹤0.01% |
8,400
-500
| -6% | -$1.91K |
|
6024
PUT
Kennametal
KMT
$2.56B
| $45K | ﹤0.01% |
+2,000
| New | +$41.6K |
|
6025
CALL
Lyell Immunopharma
LYEL
$318M
| $45K | ﹤0.01% |
+5,200
| New | +$47.4K |
|
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.