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 | |
|---|---|---|---|---|---|---|
4526
CALL
VSE Corp
VSEC
$5.19B
| $167K | ﹤0.01% |
1,400
| – | – |
|
|
KNGS
4527
PUT
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $167K | ﹤0.01% |
5,000
-4,200
| -46% | -$140K |
|
4528
Cognex
CGNX
$9.62B
| $165K | ﹤0.01% |
5,562
+3,334
| +150% | +$117K |
|
4529
Playtika
PLTK
$1.53B
| $165K | ﹤0.01% |
31,943
+25,841
| +423% | +$162K |
|
4530
PUT
Insight Enterprises
NSIT
$3.85B
| $164K | ﹤0.01% |
1,100
| – | – |
|
4531
GraniteShares 2x Short NVDA Daily ETF
NVD
$66.1M
| $164K | ﹤0.01% |
4,758
+2,538
| +114% | +$73.8K |
|
4532
Option Care Health
OPCH
$3.58B
| $164K | ﹤0.01% |
4,699
-10,421
| -69% | -$327K |
|
4533
CALL
Sasol
SSL
$7.4B
| $164K | ﹤0.01% |
39,000
+36,100
| +1,245% | +$164K |
|
4534
CALL
A.O. Smith
AOS
$8.55B
| $163K | ﹤0.01% |
2,500
-3,500
| -58% | -$237K |
|
|
OPTU
4535
CALL
Optimum Communications Inc
OPTU
$298M
| $163K | ﹤0.01% |
61,600
-355,200
| -85% | -$960K |
|
4536
PUT
Bit Digital
BTBT
$428M
| $163K | ﹤0.01% |
80,700
-100,900
| -56% | -$291K |
|
4537
PUT
Carter's
CRI
$1.43B
| $163K | ﹤0.01% |
4,000
+2,300
| +135% | +$111K |
|
4538
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$7.78B
| $163K | ﹤0.01% |
3,600
-700
| -16% | -$23K |
|
4539
CALL
Intapp
INTA
$2.44B
| $163K | ﹤0.01% |
2,800
+2,000
| +250% | +$132K |
|
4540
CALL
RPC Inc
RES
$1.13B
| $163K | ﹤0.01% |
29,800
+29,400
| +7,350% | +$175K |
|
4541
Conduent
CNDT
$253M
| $162K | ﹤0.01% |
+60,301
| New | +$220K |
|
4542
PUT
Comstock
LODE
$206M
| $162K | ﹤0.01% |
66,500
+62,620
| +1,614% | +$208K |
|
4543
O-I Glass
OI
$1.18B
| $162K | ﹤0.01% |
14,182
-19,526
| -58% | -$222K |
|
4544
PUT
Omeros
OMER
$845M
| $162K | ﹤0.01% |
19,800
-42,700
| -68% | -$377K |
|
4545
PUT
Prospect Capital
PSEC
$1.08B
| $162K | ﹤0.01% |
39,600
-170,100
| -81% | -$732K |
|
4546
Clearway Energy Class C
CWEN
$4.79B
| $161K | ﹤0.01% |
5,338
-243
| -4% | -$6.61K |
|
|
DENN
4547
DELISTED
Denny's
DENN
| $161K | ﹤0.01% |
44,006
+43,320
| +6,315% | +$228K |
|
4548
CALL
Power Integrations
POWI
$3.15B
| $161K | ﹤0.01% |
3,200
-200
| -6% | -$12K |
|
4549
CALL
Carlyle Secured Lending
CGBD
$708M
| $160K | ﹤0.01% |
9,900
+1,900
| +24% | +$33.6K |
|
4550
PUT
Gladstone Investment Corp
GAIN
$642M
| $160K | ﹤0.01% |
12,000
-1,000
| -8% | -$13.4K |
|
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.