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 | |
|---|---|---|---|---|---|---|
3901
CALL
Aldeyra Therapeutics
ALDX
$95.3M
| $311K | ﹤0.01% |
46,700
+9,100
| +24% | +$67.5K |
|
3902
Cognex
CGNX
$10B
| $311K | ﹤0.01% |
+7,334
| New | +$361K |
|
3903
PUT
Kayne Anderson Energy Infrastructure Fund
KYN
$2.43B
| $311K | ﹤0.01% |
37,000
-10,500
| -22% | -$90.5K |
|
3904
PUT
BBVA Argentina
BBAR
$3.85B
| $310K | ﹤0.01% |
74,800
+5,500
| +8% | +$29.5K |
|
3905
Cellebrite
CLBT
$3.7B
| $310K | ﹤0.01% |
40,542
+19,582
| +93% | +$147K |
|
3906
PUT
Klaviyo
KVYO
$5.65B
| $310K | ﹤0.01% |
+9,000
| New | +$309K |
|
3907
CALL
Star Bulk Carriers
SBLK
$3.12B
| $310K | ﹤0.01% |
16,100
-63,500
| -80% | -$1.13M |
|
3908
CALL
SSR Mining
SSRM
$5.27B
| $310K | ﹤0.01% |
23,400
+8,600
| +58% | +$125K |
|
3909
Winnebago Industries
WGO
$908M
| $310K | ﹤0.01% |
+5,225
| New | +$339K |
|
|
OKLO
3910
CALL
Oklo
OKLO
$6.89B
| $310K | ﹤0.01% |
+30,000
| New | +$311K |
|
3911
Carpenter Technology
CRS
$27.8B
| $309K | ﹤0.01% |
+4,602
| New | +$279K |
|
3912
PUT
Fidelity National Financial
FNF
$14.6B
| $309K | ﹤0.01% |
7,500
-29,500
| -80% | -$1.18M |
|
3913
PUT
JFrog
FROG
$9.26B
| $309K | ﹤0.01% |
12,200
+5,500
| +82% | +$153K |
|
|
ODP
3914
CALL
DELISTED
ODP
ODP
| $309K | ﹤0.01% |
6,700
+4,600
| +219% | +$221K |
|
3915
CALL
Xometry
XMTR
$4.58B
| $309K | ﹤0.01% |
18,200
+15,500
| +574% | +$293K |
|
3916
Pinnacle Financial Partners Inc
PNFP
$15.9B
| $308K | ﹤0.01% |
+4,597
| New | +$310K |
|
3917
PUT
PubMatic
PUBM
$605M
| $308K | ﹤0.01% |
25,500
-8,700
| -25% | -$132K |
|
3918
PUT
Aecom
ACM
$9.57B
| $307K | ﹤0.01% |
3,700
+3,400
| +1,133% | +$293K |
|
|
ARR
3919
CALL
Armour Residential REIT
ARR
$2.32B
| $307K | ﹤0.01% |
14,460
-7,300
| -34% | -$180K |
|
3920
Emergent Biosolutions
EBS
$377M
| $307K | ﹤0.01% |
90,409
+32,894
| +57% | +$182K |
|
|
TGR
3921
CALL
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $307K | ﹤0.01% |
16,000
+14,800
| +1,233% | +$284K |
|
3922
JPMorgan Equity Premium Income ETF
JEPI
$45.9B
| $306K | ﹤0.01% |
+5,726
| New | +$316K |
|
3923
PUT
BCE
BCE
$20.3B
| $305K | ﹤0.01% |
8,000
-2,900
| -27% | -$122K |
|
|
NSTG
3924
CALL
DELISTED
NanoString Technologies, Inc.
NSTG
| $305K | ﹤0.01% |
177,600
+10,700
| +6% | +$32.6K |
|
3925
CALL
BigBear.ai
BBAI
$1.32B
| $304K | ﹤0.01% |
201,400
-19,100
| -9% | -$33.2K |
|
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.