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 | |
|---|---|---|---|---|---|---|
4876
Vanguard Morningstar Mid-Cap ETF
VO
$106B
| $124K | ﹤0.01% |
2,400
-1,500
| -38% | -$82.3K |
|
4877
CALL
Applied Industrial Technologies
AIT
$12.6B
| $123K | ﹤0.01% |
800
-7,300
| -90% | -$1.09M |
|
|
ASRT
4878
PUT
DELISTED
Assertio
ASRT
| $123K | ﹤0.01% |
3,207
+2,354
| +276% | +$137K |
|
4879
CALL
B2Gold
BTG
$5.13B
| $123K | ﹤0.01% |
42,700
-22,600
| -35% | -$73.5K |
|
4880
CALL
Capricor Therapeutics
CAPR
$243M
| $123K | ﹤0.01% |
36,000
+500
| +1% | +$2.81K |
|
4881
PUT
Digimarc Corp
DMRC
$146M
| $123K | ﹤0.01% |
3,800
-100
| -3% | -$3.2K |
|
4882
CALL
Kymera Therapeutics
KYMR
$8.8B
| $123K | ﹤0.01% |
8,900
-6,700
| -43% | -$135K |
|
|
RDUS
4883
DELISTED
Radius Recycling
RDUS
| $123K | ﹤0.01% |
4,436
+4,312
| +3,477% | +$133K |
|
4884
CALL
ProShares UltraShort Industrials
SIJ
$5.97M
| $123K | ﹤0.01% |
775
-3,325
| -81% | -$174K |
|
|
THS
4885
DELISTED
Treehouse Foods
THS
| $123K | ﹤0.01% |
2,831
-6,046
| -68% | -$289K |
|
|
ABK
4886
CALL
DELISTED
Ambac Financial Group
ABK
| $123K | ﹤0.01% |
10,200
-9,400
| -48% | -$113K |
|
4887
CALL
Bionano Genomics
BNGO
$12.2M
| $122K | ﹤0.01% |
672
+533
| +383% | +$140K |
|
4888
Compass
COMP
$8.56B
| $122K | ﹤0.01% |
+42,336
| New | +$150K |
|
4889
PUT
Camden Property Trust
CPT
$11.2B
| $122K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$128K |
|
4890
PUT
Harrow
HROW
$1.45B
| $122K | ﹤0.01% |
8,500
-7,400
| -47% | -$129K |
|
4891
CALL
ONE Gas
OGS
$4.9B
| $122K | ﹤0.01% |
1,800
+1,200
| +200% | +$90.7K |
|
4892
State Street SPDR S&P Dividend ETF
SDY
$21.8B
| $122K | ﹤0.01% |
1,069
+361
| +51% | +$44.1K |
|
4893
CALL
Arvinas
ARVN
$536M
| $121K | ﹤0.01% |
6,200
-600
| -9% | -$14.7K |
|
|
CMPS
4894
PUT
Compass Pathways
CMPS
$1.56B
| $121K | ﹤0.01% |
16,400
+6,300
| +62% | +$55.8K |
|
4895
CALL
eHealth
EHTH
$43.8M
| $121K | ﹤0.01% |
16,400
+2,300
| +16% | +$18.1K |
|
4896
CALL
LoveSac
LOVE
$236M
| $121K | ﹤0.01% |
6,100
+2,100
| +53% | +$51.8K |
|
4897
PUT
Main Street Capital
MAIN
$5.06B
| $121K | ﹤0.01% |
3,000
-5,000
| -63% | -$204K |
|
4898
PUT
Omnicell
OMCL
$1.69B
| $121K | ﹤0.01% |
2,700
+1,300
| +93% | +$78.8K |
|
4899
PUT
TH International
THCH
$57.7M
| $121K | ﹤0.01% |
13,380
-43,300
| -76% | -$524K |
|
|
EVBG
4900
PUT
DELISTED
Everbridge, Inc. Common Stock
EVBG
| $121K | ﹤0.01% |
5,400
+4,400
| +440% | +$113K |
|
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.