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 | |
|---|---|---|---|---|---|---|
5901
Global X FinTech ETF
FINX
$170M
| $45K | ﹤0.01% |
+2,254
| New | +$50K |
|
5902
CALL
inTEST
INTT
$155M
| $45K | ﹤0.01% |
3,000
-18,600
| -86% | -$344K |
|
5903
PUT
Lakeland Industries
LAKE
$113M
| $45K | ﹤0.01% |
+3,000
| New | +$44.5K |
|
5904
PUT
NewMarket
NEU
$7.82B
| $45K | ﹤0.01% |
+100
| New | +$45.1K |
|
5905
CALL
Patrick Industries
PATK
$2.74B
| $45K | ﹤0.01% |
900
-29,100
| -97% | -$1.57M |
|
|
PINC
5906
PUT
DELISTED
Premier
PINC
| $45K | ﹤0.01% |
+2,100
| New | +$52.4K |
|
|
PSTL
5907
CALL
Postal Realty Trust
PSTL
$694M
| $45K | ﹤0.01% |
3,400
-24,200
| -88% | -$351K |
|
5908
CALL
VistaGen Therapeutics
VTGN
$9.89M
| $45K | ﹤0.01% |
8,600
+6,300
| +274% | +$28K |
|
5909
CALL
Westlake Chemical Partners
WLKP
$763M
| $45K | ﹤0.01% |
2,100
-5,600
| -73% | -$125K |
|
|
VBIV
5910
CALL
DELISTED
VBI Vaccines, Inc. New Common Stock (Canada)
VBIV
| $45K | ﹤0.01% |
68,600
+11,600
| +20% | +$14.2K |
|
5911
CALL
ABM Industries
ABM
$2.81B
| $44K | ﹤0.01% |
1,100
-4,400
| -80% | -$191K |
|
5912
Assured Guaranty
AGO
$3.66B
| $44K | ﹤0.01% |
+738
| New | +$43.8K |
|
|
BASE
5913
PUT
DELISTED
Couchbase
BASE
| $44K | ﹤0.01% |
2,600
+2,200
| +550% | +$36K |
|
5914
PUT
First Watch Restaurant Group
FWRG
$792M
| $44K | ﹤0.01% |
2,600
+800
| +44% | +$14.8K |
|
5915
PUT
Gogo Inc
GOGO
$565M
| $44K | ﹤0.01% |
3,700
-10,600
| -74% | -$146K |
|
5916
Global X Hydrogen ETF
HYDR
$83.9M
| $44K | ﹤0.01% |
1,209
+971
| +408% | +$43.5K |
|
5917
CALL
KRONOS Worldwide
KRO
$693M
| $44K | ﹤0.01% |
5,700
+200
| +4% | +$1.74K |
|
5918
MediaAlpha
MAX
$758M
| $44K | ﹤0.01% |
5,410
-5,598
| -51% | -$50K |
|
5919
PUT
Everspin Technologies
MRAM
$341M
| $44K | ﹤0.01% |
4,500
+1,000
| +29% | +$9.67K |
|
5920
PUT
NerdWallet
NRDS
$592M
| $44K | ﹤0.01% |
5,000
+4,800
| +2,400% | +$44.9K |
|
5921
CALL
CarParts.com
PRTS
$43.7M
| $44K | ﹤0.01% |
1,070
+560
| +110% | +$24.8K |
|
5922
PUT
Richardson Electronics
RELL
$267M
| $44K | ﹤0.01% |
+4,100
| New | +$52.8K |
|
5923
CALL
Senseonics Holdings Inc
SENS
$263M
| $44K | ﹤0.01% |
3,690
+280
| +8% | +$3.86K |
|
5924
Silgan Holdings
SLGN
$4.23B
| $44K | ﹤0.01% |
1,027
+707
| +221% | +$31.7K |
|
5925
PUT
STAG Industrial
STAG
$7.38B
| $44K | ﹤0.01% |
1,300
-7,200
| -85% | -$261K |
|
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.