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 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1651
PUT
Roivant Sciences
ROIV
$25.2B
| $3.05M | ﹤0.01% |
302,000
+122,900
| +69% | +$1.33M |
|
1652
PUT
Hyatt Hotels
H
$17.6B
| $3.04M | ﹤0.01% |
24,800
+1,700
| +7% | +$245K |
|
1653
Elbit Systems
ESLT
$38.4B
| $3.04M | ﹤0.01% |
7,918
+6,862
| +650% | +$2.22M |
|
1654
Freeport-McMoran
FCX
$90B
| $3.02M | ﹤0.01% |
79,758
-180,775
| -69% | -$6.92M |
|
1655
PUT
Amplify Online Retail ETF
IBUY
$106M
| $3.02M | ﹤0.01% |
191,400
+70,400
| +58% | +$4.65M |
|
1656
Roku
ROKU
$21.1B
| $3.02M | ﹤0.01% |
42,853
-79,206
| -65% | -$6.34M |
|
1657
CALL
Mistras Group
MG
$492M
| $3.01M | ﹤0.01% |
+284,500
| New | +$2.81M |
|
1658
PUT
J.M. Smucker
SJM
$12.6B
| $3.01M | ﹤0.01% |
25,400
+15,300
| +151% | +$1.65M |
|
1659
PUT
Transmedics
TMDX
$2.5B
| $3.01M | ﹤0.01% |
44,700
-17,900
| -29% | -$1.23M |
|
1660
CALL
FuboTV Inc
FUBO
$245M
| $3M | ﹤0.01% |
85,708
+45,625
| +114% | +$1.99M |
|
1661
Gartner
IT
$9.41B
| $3M | ﹤0.01% |
7,154
+6,856
| +2,301% | +$3.38M |
|
1662
CALL
Nextpower Inc
NXT
$15.2B
| $3M | ﹤0.01% |
71,200
+31,000
| +77% | +$1.38M |
|
1663
CALL
Insulet
PODD
$11.3B
| $2.99M | ﹤0.01% |
11,400
+900
| +9% | +$244K |
|
1664
PUT
ProShares UltraShort Health Care
RXD
$3.25M
| $2.99M | ﹤0.01% |
44,550
-94,900
| -68% | -$2.04M |
|
1665
CALL
Edgewise Therapeutics
EWTX
$4.39B
| $2.99M | ﹤0.01% |
135,900
+123,900
| +1,033% | +$3.25M |
|
1666
PUT
Madrigal Pharmaceuticals
MDGL
$12.6B
| $2.98M | ﹤0.01% |
9,000
+1,300
| +17% | +$427K |
|
1667
CALL
Trimble
TRMB
$12.3B
| $2.97M | ﹤0.01% |
45,300
+25,400
| +128% | +$1.83M |
|
|
LX
1668
PUT
LexinFintech Holdings
LX
$244M
| $2.97M | ﹤0.01% |
294,600
+125,400
| +74% | +$1.05M |
|
1669
CALL
McEwen Inc
MUX
$1.03B
| $2.97M | ﹤0.01% |
393,600
+377,200
| +2,300% | +$2.94M |
|
1670
Burlington
BURL
$22B
| $2.96M | ﹤0.01% |
12,438
+7,076
| +132% | +$1.83M |
|
1671
Viking Therapeutics
VKTX
$4.04B
| $2.96M | ﹤0.01% |
122,755
+90,614
| +282% | +$2.86M |
|
1672
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$249M
| $2.96M | ﹤0.01% |
90,900
-73,100
| -45% | -$3.43M |
|
1673
CALL
iShares Core MSCI Emerging Markets ETF
IEMG
$149B
| $2.96M | ﹤0.01% |
59,600
-326,500
| -85% | -$17.6M |
|
1674
PUT
Frontline
FRO
$8.75B
| $2.96M | ﹤0.01% |
199,200
+9,100
| +5% | +$150K |
|
1675
PUT
Franklin Resources
BEN
$16.9B
| $2.95M | ﹤0.01% |
153,400
-169,900
| -53% | -$3.4M |
|
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 withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- 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.