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 | |
|---|---|---|---|---|---|---|
1551
PUT
Monster Beverage
MNST
$85.1B
| $3.46M | ﹤0.01% |
118,400
-395,200
| -77% | -$10.3M |
|
1552
CALL
Illumina
ILMN
$32.1B
| $3.46M | ﹤0.01% |
49,600
-23,300
| -32% | -$2.52M |
|
1553
CALL
Nokia
NOK
$58.5B
| $3.46M | ﹤0.01% |
656,900
-351,900
| -35% | -$1.72M |
|
1554
PUT
SS&C Technologies
SSNC
$19.1B
| $3.46M | ﹤0.01% |
41,400
+38,100
| +1,155% | +$3.15M |
|
1555
CALL
Natera
NTRA
$46.7B
| $3.45M | ﹤0.01% |
24,400
-2,800
| -10% | -$450K |
|
1556
CALL
Domino's
DPZ
$11.3B
| $3.44M | ﹤0.01% |
7,500
-23,100
| -75% | -$10.4M |
|
1557
Eos Energy Enterprises
EOSE
$1.62B
| $3.44M | ﹤0.01% |
910,716
+860,629
| +1,718% | +$4.19M |
|
1558
PUT
PTC
PTC
$14.7B
| $3.44M | ﹤0.01% |
22,200
+11,800
| +113% | +$2.03M |
|
1559
PUT
Life Time Group Holdings
LTH
$9.59B
| $3.42M | ﹤0.01% |
113,400
+40,200
| +55% | +$1.18M |
|
|
VSXY
1560
CALL
Victoria's Secret
VSXY
$6.17B
| $3.42M | ﹤0.01% |
184,000
+60,800
| +49% | +$1.79M |
|
1561
PUT
Fidelity National Information Services
FIS
$20.7B
| $3.41M | ﹤0.01% |
45,700
+22,100
| +94% | +$1.66M |
|
1562
PUT
Guardant Health
GH
$21.6B
| $3.4M | ﹤0.01% |
79,900
+39,400
| +97% | +$1.7M |
|
1563
CALL
Huntington Bancshares
HBAN
$34.1B
| $3.4M | ﹤0.01% |
226,700
-156,200
| -41% | -$2.52M |
|
1564
CALL
Sarepta Therapeutics
SRPT
$2.13B
| $3.4M | ﹤0.01% |
53,200
-23,500
| -31% | -$2.47M |
|
1565
PUT
Stryker
SYK
$109B
| $3.39M | ﹤0.01% |
9,100
-44,200
| -83% | -$16.8M |
|
|
GTM
1566
PUT
ZoomInfo Technologies
GTM
$1.13B
| $3.39M | ﹤0.01% |
338,600
-273,100
| -45% | -$2.86M |
|
1567
PUT
KeyCorp
KEY
$23.4B
| $3.38M | ﹤0.01% |
211,200
-55,400
| -21% | -$940K |
|
1568
PUT
Annaly Capital Management
NLY
$17.2B
| $3.38M | ﹤0.01% |
166,300
-14,500
| -8% | -$298K |
|
1569
PUT
Kohl's
KSS
$2.14B
| $3.37M | ﹤0.01% |
412,300
+117,600
| +40% | +$1.37M |
|
1570
CALL
Hilton Worldwide
HLT
$69.2B
| $3.37M | ﹤0.01% |
14,800
+1,200
| +9% | +$299K |
|
1571
PUT
Centrus Energy
LEU
$3.73B
| $3.37M | ﹤0.01% |
54,100
-8,800
| -14% | -$742K |
|
1572
PUT
iShares Convertible Bond ETF
ICVT
$7.94B
| $3.36M | ﹤0.01% |
94,300
+37,100
| +65% | +$3.2M |
|
1573
CALL
SL Green Realty
SLG
$3.84B
| $3.36M | ﹤0.01% |
58,200
+32,100
| +123% | +$2.02M |
|
1574
Philips
PHG
$24.9B
| $3.35M | ﹤0.01% |
142,807
+135,095
| +1,752% | +$3.31M |
|
1575
Salesforce
CRM
$204B
| $3.35M | ﹤0.01% |
12,498
-15,705
| -56% | -$4.88M |
|
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.