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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.56% |
| 2 | Technology | 0.41% |
| 3 | Consumer Discretionary | 0.22% |
| 4 | Healthcare | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1051
CALL
Keurig Dr Pepper
KDP
$44.3B
| $7.52M | ﹤0.01% |
219,900
-186,500
| -46% | -$6.06M |
|
1052
PUT
CoStar Group
CSGP
$12.5B
| $7.52M | ﹤0.01% |
94,900
+76,300
| +410% | +$5.8M |
|
1053
CALL
Vodafone
VOD
$39.1B
| $7.51M | ﹤0.01% |
801,200
+573,500
| +252% | +$5.04M |
|
1054
CALL
Public Service Enterprise Group
PEG
$36.7B
| $7.5M | ﹤0.01% |
91,100
-10,200
| -10% | -$851K |
|
1055
CALL
Nasdaq
NDAQ
$54.2B
| $7.48M | ﹤0.01% |
98,600
+30,800
| +45% | +$2.42M |
|
1056
Enphase Energy
ENPH
$4.81B
| $7.44M | ﹤0.01% |
+119,961
| New | +$7.59M |
|
1057
PUT
Mobileye
MBLY
$7.28B
| $7.43M | ﹤0.01% |
516,400
-606,600
| -54% | -$9.91M |
|
1058
CALL
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$4.26B
| $7.42M | ﹤0.01% |
161,700
+113,400
| +235% | +$5.92M |
|
1059
Mercado Libre
MELI
$100B
| $7.41M | ﹤0.01% |
3,796
+1,244
| +49% | +$2.47M |
|
1060
CALL
BHP
BHP
$230B
| $7.39M | ﹤0.01% |
251,700
-14,500
| -5% | -$722K |
|
|
EH
1061
PUT
EHang Holdings
EH
$356M
| $7.38M | ﹤0.01% |
353,500
-2,400
| -0.7% | -$48.7K |
|
1062
PUT
Natera
NTRA
$47.3B
| $7.38M | ﹤0.01% |
52,200
+28,900
| +124% | +$4.65M |
|
1063
CALL
Transocean
RIG
$6.53B
| $7.38M | ﹤0.01% |
2,327,900
-1,069,400
| -31% | -$3.75M |
|
1064
PUT
S&P Global
SPGI
$131B
| $7.37M | ﹤0.01% |
14,500
-104,600
| -88% | -$53.4M |
|
1065
CALL
Kimberly-Clark
KMB
$34.9B
| $7.34M | ﹤0.01% |
51,600
-2,900
| -5% | -$391K |
|
1066
CALL
CRISPR Therapeutics
CRSP
$5.39B
| $7.34M | ﹤0.01% |
215,600
+69,600
| +48% | +$2.95M |
|
1067
CALL
The Mosaic Company
MOS
$8.22B
| $7.33M | ﹤0.01% |
271,600
+36,100
| +15% | +$955K |
|
1068
PUT
Alaska Air
ALK
$4.69B
| $7.33M | ﹤0.01% |
148,900
+112,600
| +310% | +$7.39M |
|
1069
CALL
Whirlpool
WHR
$2.56B
| $7.31M | ﹤0.01% |
81,100
+10,800
| +15% | +$1.15M |
|
1070
CALL
ProShares Ultra S&P500
SSO
$9.11B
| $7.3M | ﹤0.01% |
185,000
+18,200
| +11% | +$840K |
|
1071
PUT
PennyMac Financial
PFSI
$3.81B
| $7.3M | ﹤0.01% |
72,900
-9,800
| -12% | -$1.01M |
|
1072
PUT
Texas Pacific Land
TPL
$25B
| $7.29M | ﹤0.01% |
16,500
+3,300
| +25% | +$1.47M |
|
|
METD
1073
PUT
Direxion Daily META Bear 1X ETF
METD
$8.53M
| $7.27M | ﹤0.01% |
189,200
+700
| +0.4% | +$12.6K |
|
1074
Dollar General
DG
$29.4B
| $7.24M | ﹤0.01% |
82,295
+45,501
| +124% | +$3.44M |
|
1075
CALL
NextNav
NN
$2.56B
| $7.23M | ﹤0.01% |
604,000
+361,900
| +149% | +$4.37M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.