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 | |
|---|---|---|---|---|---|---|
|
SAIL
6951
PUT
SailPoint Inc
SAIL
$8.63B
| $15.9K | ﹤0.01% |
1,200
-1,200
| -50% | -$18.7K |
|
6952
PUT
Coherus Oncology
CHRS
$219M
| $15.9K | ﹤0.01% |
9,400
+2,500
| +36% | +$4.44K |
|
6953
iShares Global Infrastructure ETF
IGF
$10.8B
| $15.9K | ﹤0.01% |
+237
| New | +$15.6K |
|
6954
CALL
Gates Industrial Corporation Ltd.
GTES
$6.87B
| $15.8K | ﹤0.01% |
700
-10,400
| -94% | -$253K |
|
|
SEZL
6955
Sezzle
SEZL
$5.78B
| $15.8K | ﹤0.01% |
+250
| New | +$17K |
|
6956
iShares MSCI EAFE Growth ETF
EFG
$16.6B
| $15.8K | ﹤0.01% |
+142
| New | +$16.7K |
|
|
AIRJ
6957
Montana Technologies Corp
AIRJ
$273M
| $15.8K | ﹤0.01% |
6,299
-34,920
| -85% | -$118K |
|
6958
Flotek Industries
FTK
$927M
| $15.7K | ﹤0.01% |
924
-815
| -47% | -$14K |
|
6959
American Public Education
APEI
$904M
| $15.6K | ﹤0.01% |
+275
| New | +$12.6K |
|
6960
Cars.com
CARS
$669M
| $15.6K | ﹤0.01% |
1,926
-3,688
| -66% | -$37.7K |
|
6961
PUT
Middlesex Water
MSEX
$1.06B
| $15.6K | ﹤0.01% |
+300
| New | +$15.8K |
|
6962
Veritone
VERI
$104M
| $15.6K | ﹤0.01% |
7,923
-25,641
| -76% | -$86.7K |
|
6963
CALL
MacroGenics
MGNX
$275M
| $15.6K | ﹤0.01% |
5,400
+5,300
| +5,300% | +$11.3K |
|
|
OTLY
6964
Oatly Group
OTLY
$309M
| $15.6K | ﹤0.01% |
1,539
-3,468
| -69% | -$38.5K |
|
6965
CALL
Open Text
OTEX
$5.66B
| $15.6K | ﹤0.01% |
700
-3,200
| -82% | -$83.1K |
|
6966
Quince Therapeutics
QNCX
$18.4M
| $15.6K | ﹤0.01% |
770
-66
| -8% | -$13.2K |
|
6967
Fidus Investment
FDUS
$746M
| $15.6K | ﹤0.01% |
893
-4,385
| -83% | -$81.9K |
|
|
ZEPP
6968
CALL
Zepp Health
ZEPP
$77.6M
| $15.5K | ﹤0.01% |
1,300
-1,000
| -43% | -$20.5K |
|
6969
PUT
Silgan Holdings
SLGN
$4.82B
| $15.5K | ﹤0.01% |
400
-300
| -43% | -$13.2K |
|
|
NBP
6970
CALL
NovaBridge Biosciences American Depositary Shares
NBP
$207M
| $15.5K | ﹤0.01% |
6,300
-20,800
| -77% | -$69.6K |
|
|
EFOR
6971
PUT
Everforth Inc
EFOR
$751M
| $15.5K | ﹤0.01% |
+400
| New | +$17.8K |
|
6972
Amplify Travel Tech ETF
AWAY
$24.5M
| $15.5K | ﹤0.01% |
962
+938
| +3,908% | +$17K |
|
6973
CALL
RF Industries
RFIL
$141M
| $15.5K | ﹤0.01% |
1,500
+900
| +150% | +$9.13K |
|
|
NVX
6974
CALL
NOVONIX
NVX
$100M
| $15.5K | ﹤0.01% |
22,400
+4,100
| +22% | +$3.98K |
|
6975
Westrock Coffee
WEST
$711M
| $15.4K | ﹤0.01% |
3,631
-1,699
| -32% | -$7.58K |
|
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.