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
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3576
PUT
Shutterstock
SSTK
$220M
| $426K | ﹤0.01% |
11,200
-9,500
| -46% | -$426K |
|
|
TUP
3577
CALL
DELISTED
Tupperware Brands Corporation
TUP
| $425K | ﹤0.01% |
303,600
+273,800
| +919% | +$614K |
|
3578
CALL
Eversource Energy
ES
$28.4B
| $424K | ﹤0.01% |
7,300
-3,400
| -32% | -$227K |
|
3579
PUT
StealthGas
GASS
$330M
| $424K | ﹤0.01% |
84,400
+79,300
| +1,555% | +$385K |
|
3580
Peloton Interactive
PTON
$2.83B
| $424K | ﹤0.01% |
84,048
-52,579
| -38% | -$374K |
|
3581
CALL
Vicor
VICR
$8.76B
| $424K | ﹤0.01% |
7,200
+6,000
| +500% | +$398K |
|
3582
CALL
Kornit Digital
KRNT
$708M
| $423K | ﹤0.01% |
22,400
-9,200
| -29% | -$227K |
|
3583
CALL
Trustmark
TRMK
$2.75B
| $423K | ﹤0.01% |
+19,500
| New | +$453K |
|
3584
PUT
MBIA
MBI
$278M
| $421K | ﹤0.01% |
58,500
+22,800
| +64% | +$190K |
|
|
BDN
3585
CALL
Brandywine Realty Trust
BDN
$521M
| $419K | ﹤0.01% |
92,500
+45,200
| +96% | +$215K |
|
3586
FirstEnergy
FE
$28.7B
| $419K | ﹤0.01% |
+12,275
| New | +$457K |
|
|
NEWR
3587
CALL
DELISTED
New Relic, Inc.
NEWR
| $419K | ﹤0.01% |
4,900
-8,800
| -64% | -$709K |
|
|
RAD
3588
PUT
DELISTED
Rite Aid Corporation
RAD
| $419K | ﹤0.01% |
476,900
+419,400
| +729% | +$562K |
|
3589
CALL
National Grid
NGG
$81.3B
| $418K | ﹤0.01% |
7,322
-13,371
| -65% | -$808K |
|
3590
PUT
Schrodinger
SDGR
$1.14B
| $418K | ﹤0.01% |
14,800
+1,700
| +13% | +$68.5K |
|
|
HA
3591
PUT
DELISTED
Hawaiian Holdings, Inc.
HA
| $418K | ﹤0.01% |
66,100
+62,900
| +1,966% | +$597K |
|
3592
CALL
EnerSys
ENS
$6.69B
| $416K | ﹤0.01% |
4,400
+1,500
| +52% | +$154K |
|
3593
PUT
Lear
LEA
$7.44B
| $416K | ﹤0.01% |
3,100
-14,100
| -82% | -$2.04M |
|
3594
PUT
MACOM Technology Solutions
MTSI
$19B
| $416K | ﹤0.01% |
5,100
+3,700
| +264% | +$274K |
|
3595
CALL
Belden
BDC
$4.09B
| $415K | ﹤0.01% |
+4,300
| New | +$402K |
|
3596
PUT
MKS Inc
MKSI
$19.3B
| $415K | ﹤0.01% |
4,800
+3,300
| +220% | +$322K |
|
3597
CALL
RenaissanceRe
RNR
$13.9B
| $415K | ﹤0.01% |
2,100
-13,100
| -86% | -$2.52M |
|
3598
CALL
Liberty Energy
LBRT
$2.89B
| $414K | ﹤0.01% |
22,400
+14,500
| +184% | +$239K |
|
3599
CALL
Sun Communities
SUI
$15.3B
| $414K | ﹤0.01% |
3,500
+2,200
| +169% | +$279K |
|
3600
CALL
Yext
YEXT
$564M
| $414K | ﹤0.01% |
65,500
-96,700
| -60% | -$827K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.