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 | |
|---|---|---|---|---|---|---|
3626
CALL
Microvision
MVIS
$86.6M
| $402K | ﹤0.01% |
183,800
-42,000
| -19% | -$128K |
|
3627
PUT
Full Truck Alliance
YMM
$9.64B
| $402K | ﹤0.01% |
57,200
+200
| +0.4% | +$1.38K |
|
3628
CALL
Cemex
CX
$17.3B
| $401K | ﹤0.01% |
61,700
-80,800
| -57% | -$600K |
|
3629
Henry Schein
HSIC
$9.76B
| $401K | ﹤0.01% |
+5,402
| New | +$416K |
|
3630
Dorian LPG
LPG
$1.9B
| $401K | ﹤0.01% |
+13,973
| New | +$376K |
|
3631
Olin
OLN
$2.44B
| $401K | ﹤0.01% |
8,028
+4,136
| +106% | +$223K |
|
3632
PUT
QuidelOrtho
QDEL
$1.14B
| $401K | ﹤0.01% |
5,500
-1,600
| -23% | -$128K |
|
3633
PUT
SSR Mining
SSRM
$5.27B
| $401K | ﹤0.01% |
30,200
-32,800
| -52% | -$475K |
|
3634
Vanguard Dividend Appreciation ETF
VIG
$113B
| $401K | ﹤0.01% |
+2,582
| New | +$419K |
|
3635
PUT
Buckle
BKE
$2.35B
| $400K | ﹤0.01% |
12,000
-4,100
| -25% | -$144K |
|
3636
PUT
Viking Therapeutics
VKTX
$3.93B
| $400K | ﹤0.01% |
36,200
-153,400
| -81% | -$2.19M |
|
3637
PUT
W.P. Carey
WPC
$16.8B
| $400K | ﹤0.01% |
7,555
-47,273
| -86% | -$3.03M |
|
3638
PUT
Xylem
XYL
$29.7B
| $400K | ﹤0.01% |
4,400
-10,400
| -70% | -$1.07M |
|
3639
PUT
FerroAtlántica
GSM
$628M
| $399K | ﹤0.01% |
76,800
-24,500
| -24% | -$127K |
|
3640
Oshkosh
OSK
$9.51B
| $399K | ﹤0.01% |
4,187
+69
| +2% | +$6.69K |
|
3641
PUT
SFL Corp
SFL
$1.61B
| $399K | ﹤0.01% |
35,800
-4,600
| -11% | -$47.6K |
|
3642
AdaptHealth
AHCO
$1.53B
| $398K | ﹤0.01% |
43,829
-46,356
| -51% | -$556K |
|
3643
PUT
Fulcrum Therapeutics
FULC
$248M
| $398K | ﹤0.01% |
89,700
+76,500
| +580% | +$334K |
|
|
SNBR
3644
CALL
DELISTED
Sleep Number
SNBR
| $398K | ﹤0.01% |
16,200
+12,600
| +350% | +$353K |
|
3645
CALL
Tenable Holdings
TENB
$3.46B
| $398K | ﹤0.01% |
8,900
+8,600
| +2,867% | +$386K |
|
|
ONIT
3646
PUT
Onity Group
ONIT
$341M
| $398K | ﹤0.01% |
+15,400
| New | +$462K |
|
3647
PUT
Cipher Digital
CIFR
$8.35B
| $397K | ﹤0.01% |
170,500
-80,900
| -32% | -$273K |
|
3648
Installed Building Products
IBP
$6.47B
| $397K | ﹤0.01% |
+3,186
| New | +$450K |
|
3649
PUT
TE Connectivity
TEL
$62.1B
| $395K | ﹤0.01% |
3,200
+2,500
| +357% | +$334K |
|
3650
Zai Lab
ZLAB
$2.1B
| $395K | ﹤0.01% |
16,276
+1,694
| +12% | +$45.1K |
|
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.