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 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CPRX
3576
CALL
DELISTED
Catalyst Pharmaceutical
CPRX
| $381K | ﹤0.01% |
+15,400
| New | +$367K |
|
3577
PUT
BCE
BCE
$20.2B
| $381K | ﹤0.01% |
15,100
-4,900
| -25% | -$124K |
|
3578
CALL
Cerence
CRNC
$385M
| $381K | ﹤0.01% |
60,400
-3,000
| -5% | -$27K |
|
3579
Huntsman Corp
HUN
$1.71B
| $380K | ﹤0.01% |
28,522
-49,101
| -63% | -$595K |
|
3580
Pool Corp
POOL
$6.75B
| $379K | ﹤0.01% |
+1,875
| New | +$442K |
|
3581
QuantumScape Corp
QS
$3.21B
| $378K | ﹤0.01% |
+59,228
| New | +$492K |
|
|
NNDM
3582
Nano Dimension
NNDM
$316M
| $378K | ﹤0.01% |
222,218
-681,682
| -75% | -$1.24M |
|
3583
Arbor Realty Trust
ABR
$964M
| $377K | ﹤0.01% |
+48,923
| New | +$381K |
|
3584
Thomson Reuters
TRI
$42.8B
| $377K | ﹤0.01% |
4,127
+3,837
| +1,323% | +$405K |
|
|
YSS
3585
CALL
York Space Systems
YSS
$1.94B
| $377K | ﹤0.01% |
+17,000
| New | +$412K |
|
3586
PUT
Glaukos
GKOS
$9.83B
| $377K | ﹤0.01% |
3,500
-1,100
| -24% | -$124K |
|
3587
Natera
NTRA
$38.3B
| $377K | ﹤0.01% |
1,884
-1,387
| -42% | -$298K |
|
3588
CALL
PAR Technology
PAR
$699M
| $376K | ﹤0.01% |
28,200
+6,600
| +31% | +$155K |
|
3589
PUT
Rackspace Technology
RXT
$1.05B
| $376K | ﹤0.01% |
383,300
+361,800
| +1,683% | +$440K |
|
|
IRD
3590
Opus Genetics
IRD
$306M
| $375K | ﹤0.01% |
82,480
+73,417
| +810% | +$254K |
|
|
SAFE
3591
CALL
Safehold
SAFE
$1.16B
| $375K | ﹤0.01% |
27,700
-23,000
| -45% | -$341K |
|
3592
CALL
Arcutis Biotherapeutics
ARQT
$3.36B
| $375K | ﹤0.01% |
15,900
-14,600
| -48% | -$373K |
|
3593
PUT
Regal Rexnord
RRX
$13.7B
| $375K | ﹤0.01% |
+2,000
| New | +$372K |
|
3594
PUT
CPI Aerostructures
CVU
$66.2M
| $374K | ﹤0.01% |
95,500
+14,900
| +18% | +$61.8K |
|
3595
International Flavors & Fragrances
IFF
$20.2B
| $374K | ﹤0.01% |
+5,154
| New | +$378K |
|
3596
CALL
Scholar Rock
SRRK
$5.67B
| $374K | ﹤0.01% |
7,600
+2,000
| +36% | +$89.6K |
|
3597
MannKind Corp
MNKD
$1.21B
| $374K | ﹤0.01% |
152,471
+37,280
| +32% | +$166K |
|
3598
Arch Capital
ACGL
$34.3B
| $373K | ﹤0.01% |
3,890
-4,098
| -51% | -$392K |
|
3599
PUT
iQIYI
IQ
$1.23B
| $373K | ﹤0.01% |
276,100
-278,100
| -50% | -$480K |
|
3600
PUT
PACS Group
PACS
$7.28B
| $373K | ﹤0.01% |
11,600
-10,700
| -48% | -$393K |
|
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 withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- 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 2,156 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.