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 | |
|---|---|---|---|---|---|---|
2901
Andersons Inc
ANDE
$2.39B
| $692K | ﹤0.01% |
9,638
+9,408
| +4,090% | +$604K |
|
2902
Harrow
HROW
$1.44B
| $691K | ﹤0.01% |
+19,608
| New | +$862K |
|
2903
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.14B
| $691K | ﹤0.01% |
5,600
+300
| +6% | +$20.2K |
|
2904
PUT
EPAM Systems
EPAM
$5.58B
| $691K | ﹤0.01% |
5,100
-600
| -11% | -$103K |
|
2905
CALL
ARK 21Shares Bitcoin ETF
ARKB
$2.42B
| $690K | ﹤0.01% |
30,700
+17,400
| +131% | +$441K |
|
2906
CALL
Gladstone Investment Corp
GAIN
$642M
| $690K | ﹤0.01% |
48,600
+35,600
| +274% | +$496K |
|
2907
PUT
Fidelity National Information Services
FIS
$24.2B
| $690K | ﹤0.01% |
+14,700
| New | +$791K |
|
2908
CALL
Vanguard Total Bond Market
BND
$158B
| $689K | ﹤0.01% |
9,500
+900
| +10% | +$66.8K |
|
2909
CALL
Rambus
RMBS
$8.98B
| $688K | ﹤0.01% |
8,000
-24,200
| -75% | -$2.41M |
|
2910
CALL
Inter&Co
INTR
$2.39B
| $685K | ﹤0.01% |
86,100
-28,800
| -25% | -$250K |
|
2911
PUT
Mercury Systems
MRCY
$5.41B
| $685K | ﹤0.01% |
9,400
+9,000
| +2,250% | +$784K |
|
2912
Zillow
Z
$7.78B
| $685K | ﹤0.01% |
16,542
-25,613
| -61% | -$1.36M |
|
2913
PUT
AbCellera Biologics
ABCL
$1.65B
| $684K | ﹤0.01% |
196,100
+102,900
| +110% | +$370K |
|
2914
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$7.78B
| $684K | ﹤0.01% |
6,000
+200
| +3% | +$7.58K |
|
2915
PUT
Northern Trust
NTRS
$21.8B
| $684K | ﹤0.01% |
4,900
-4,200
| -46% | -$604K |
|
2916
CALL
Acadia Pharmaceuticals
ACAD
$4.51B
| $683K | ﹤0.01% |
30,700
+26,800
| +687% | +$640K |
|
2917
CALL
Smart Sand
SND
$179M
| $682K | ﹤0.01% |
133,300
+112,800
| +550% | +$508K |
|
2918
CALL
TTM Technologies
TTMI
$10.6B
| $682K | ﹤0.01% |
7,000
-5,400
| -44% | -$514K |
|
|
XIFR
2919
PUT
XPLR Infrastructure LP
XIFR
$1.04B
| $682K | ﹤0.01% |
64,200
-14,500
| -18% | -$149K |
|
2920
Absci
ABSI
$1.17B
| $681K | ﹤0.01% |
+227,044
| New | +$657K |
|
2921
CALL
ArriVent BioPharma
AVBP
$1.4B
| $681K | ﹤0.01% |
+29,500
| New | +$666K |
|
|
FLY
2922
PUT
Firefly Aerospace
FLY
$2.93B
| $680K | ﹤0.01% |
23,900
-17,900
| -43% | -$436K |
|
2923
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.81B
| $680K | ﹤0.01% |
+18,500
| New | +$658K |
|
2924
PUT
MediWound
MDWD
$184M
| $680K | ﹤0.01% |
42,200
+41,000
| +3,417% | +$713K |
|
|
VNET
2925
CALL
VNET Group
VNET
$1.79B
| $679K | ﹤0.01% |
80,900
-53,100
| -40% | -$563K |
|
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.