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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1576
Grab
GRAB
$12.8B
| $2.67M | ﹤0.01% |
730,250
+146,474
| +25% | +$621K |
|
1577
CALL
Itron
ITRI
$3.83B
| $2.67M | ﹤0.01% |
29,800
+28,200
| +1,763% | +$2.71M |
|
1578
PUT
Starwood Property Trust
STWD
$5.32B
| $2.67M | ﹤0.01% |
155,000
-137,500
| -47% | -$2.47M |
|
1579
PUT
Avis
CAR
$3.77B
| $2.67M | ﹤0.01% |
18,300
-297,700
| -94% | -$33.9M |
|
1580
CALL
Critical Metals Corp
CRML
$1.08B
| $2.67M | ﹤0.01% |
335,800
+218,100
| +185% | +$2.51M |
|
1581
McCormick & Company Non-Voting
MKC
$13B
| $2.66M | ﹤0.01% |
52,781
+40,415
| +327% | +$2.57M |
|
|
DQ
1582
CALL
Daqo New Energy
DQ
$767M
| $2.66M | ﹤0.01% |
125,000
+44,600
| +55% | +$1.09M |
|
1583
CleanSpark
CLSK
$3.42B
| $2.66M | ﹤0.01% |
312,267
+86,741
| +38% | +$928K |
|
|
PSKY
1584
PUT
Paramount Skydance Corp
PSKY
$11.2B
| $2.66M | ﹤0.01% |
294,600
-180,600
| -38% | -$1.98M |
|
1585
CALL
Veeva Systems
VEEV
$45.1B
| $2.65M | ﹤0.01% |
15,100
-13,800
| -48% | -$2.71M |
|
1586
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.9B
| $2.65M | ﹤0.01% |
91,600
+88,400
| +2,763% | +$2.24M |
|
1587
CALL
C3.ai
AI
$1.66B
| $2.65M | ﹤0.01% |
314,400
-503,800
| -62% | -$5.4M |
|
|
AMTM
1588
CALL
Amentum Holdings
AMTM
$4.44B
| $2.65M | ﹤0.01% |
101,500
-46,200
| -31% | -$1.45M |
|
|
PDS
1589
Precision Drilling
PDS
$997M
| $2.64M | ﹤0.01% |
+26,861
| New | +$2.3M |
|
1590
PUT
Ero Copper
ERO
$3.87B
| $2.64M | ﹤0.01% |
99,100
+49,900
| +101% | +$1.5M |
|
1591
CALL
Brighthouse Financial
BHF
$2.99B
| $2.64M | ﹤0.01% |
44,100
-119,900
| -73% | -$7.48M |
|
1592
PUT
Blackstone Secured Lending
BXSL
$5.74B
| $2.64M | ﹤0.01% |
111,300
+83,900
| +306% | +$2.09M |
|
1593
CALL
Macy's
M
$6.08B
| $2.64M | ﹤0.01% |
145,700
-97,000
| -40% | -$1.96M |
|
1594
NuScale Power
SMR
$3.18B
| $2.63M | ﹤0.01% |
243,026
+41,671
| +21% | +$634K |
|
1595
CALL
Sociedad Química y Minera de Chile
SQM
$18.9B
| $2.63M | ﹤0.01% |
+32,500
| New | +$2.47M |
|
|
1596
CALL
Blackstone Secured Lending
BXSL
$5.74B
| $2.62M | ﹤0.01% |
110,800
-20,200
| -15% | -$503K |
|
|
KEEL
1597
CALL
Keel Infrastructure Corp
KEEL
$2.21B
| $2.62M | ﹤0.01% |
1,345,200
-828,400
| -38% | -$1.95M |
|
1598
PUT
Argan
AGX
$5.31B
| $2.61M | ﹤0.01% |
4,800
-2,900
| -38% | -$1.18M |
|
|
AEXA
1599
CALL
American Exceptionalism Acquisition Corp
AEXA
$551M
| $2.61M | ﹤0.01% |
+241,000
| New | +$2.73M |
|
1600
PUT
Symbotic
SYM
$5.39B
| $2.61M | ﹤0.01% |
49,000
-84,800
| -63% | -$4.85M |
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.