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 | |
|---|---|---|---|---|---|---|
526
PUT
Chubb
CB
$133B
| $20M | 0.01% |
66,100
-10,200
| -13% | -$2.83M |
|
527
PUT
Digital Realty Trust
DLR
$66B
| $19.9M | 0.01% |
138,900
-14,800
| -10% | -$2.41M |
|
528
PUT
Cencora
COR
$58.5B
| $19.9M | 0.01% |
71,500
+24,600
| +52% | +$6.18M |
|
529
CALL
Linde
LIN
$235B
| $19.8M | 0.01% |
42,600
-16,500
| -28% | -$7.43M |
|
530
CALL
Workday
WDAY
$32.7B
| $19.8M | 0.01% |
84,900
-173,800
| -67% | -$44.4M |
|
531
PUT
MetLife
MET
$60B
| $19.8M | 0.01% |
246,800
+68,100
| +38% | +$5.66M |
|
532
PUT
Warner Bros
WBD
$64.8B
| $19.8M | 0.01% |
1,843,500
-123,100
| -6% | -$1.29M |
|
533
PUT
Shell
SHEL
$243B
| $19.7M | 0.01% |
269,400
-117,000
| -30% | -$7.88M |
|
534
Energy Transfer Partners
ET
$70.1B
| $19.6M | 0.01% |
1,055,768
-122,901
| -10% | -$2.39M |
|
535
CALL
EQT Corp
EQT
$33.8B
| $19.6M | 0.01% |
366,900
-293,900
| -44% | -$15M |
|
536
CALL
Teck Resources
TECK
$28B
| $19.6M | 0.01% |
537,800
-57,400
| -10% | -$2.38M |
|
537
PUT
Microchip Technology
MCHP
$46.2B
| $19.6M | 0.01% |
404,300
-26,900
| -6% | -$1.5M |
|
538
CALL
Rio Tinto
RIO
$150B
| $19.6M | 0.01% |
325,700
-82,200
| -20% | -$5.06M |
|
539
State Street SPDR S&P Biotech ETF
XBI
$10.2B
| $19.5M | 0.01% |
241,039
-61,655
| -20% | -$5.51M |
|
540
PUT
KE Holdings
BEKE
$17.8B
| $19.5M | 0.01% |
973,000
+230,700
| +31% | +$4.57M |
|
541
PUT
Pinterest
PINS
$12.6B
| $19.5M | 0.01% |
630,000
-491,000
| -44% | -$16.6M |
|
542
PUT
Union Pacific
UNP
$174B
| $19.5M | 0.01% |
82,500
-86,500
| -51% | -$20.8M |
|
543
PUT
GameStop
GME
$9.69B
| $19.5M | 0.01% |
872,400
+184,800
| +27% | +$4.84M |
|
544
CALL
Futu Holdings
FUTU
$14.9B
| $19.3M | 0.01% |
188,700
-46,100
| -20% | -$4.72M |
|
545
CALL
United Rentals
URI
$64.8B
| $19.3M | 0.01% |
30,800
-2,600
| -8% | -$1.79M |
|
546
PUT
Valero Energy
VLO
$92.3B
| $19.2M | 0.01% |
145,500
-48,200
| -25% | -$6.4M |
|
547
PUT
Akamai
AKAM
$18.1B
| $19.2M | 0.01% |
238,400
-42,300
| -15% | -$3.8M |
|
548
CALL
Nutanix
NTNX
$14.4B
| $19.1M | 0.01% |
272,900
+2,300
| +0.8% | +$159K |
|
549
CALL
British American Tobacco
BTI
$134B
| $19M | 0.01% |
458,200
+95,400
| +26% | +$3.75M |
|
550
PUT
IonQ
IONQ
$12.9B
| $18.9M | 0.01% |
857,900
-358,700
| -29% | -$11.6M |
|
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.