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 | |
|---|---|---|---|---|---|---|
6201
Invesco Aerospace & Defense ETF
PPA
$8.24B
| $32K | ﹤0.01% |
403
+139
| +53% | +$11.6K |
|
|
PPSI
6202
CALL
Pioneer Power Solutions
PPSI
$32.3M
| $32K | ﹤0.01% |
5,200
+4,400
| +550% | +$30.9K |
|
6203
PUT
Primoris Services
PRIM
$4.58B
| $32K | ﹤0.01% |
+1,000
| New | +$32.7K |
|
6204
Rexford Industrial Realty
REXR
$8.42B
| $32K | ﹤0.01% |
+667
| New | +$35.3K |
|
6205
CALL
Rayonier Advanced Materials
RYAM
$604M
| $32K | ﹤0.01% |
9,100
-1,400
| -13% | -$5.26K |
|
6206
SI-BONE Inc
SIBN
$788M
| $32K | ﹤0.01% |
1,533
-1,046
| -41% | -$24.2K |
|
6207
CALL
SPX Corp
SPXC
$11B
| $32K | ﹤0.01% |
400
| – | – |
|
|
ZIMV
6208
CALL
DELISTED
ZimVie
ZIMV
| $32K | ﹤0.01% |
3,500
+2,600
| +289% | +$30K |
|
|
CNH
6209
PUT
CNH Industrial
CNH
$12.7B
| $32K | ﹤0.01% |
2,700
-3,000
| -53% | -$41.5K |
|
|
CUTR
6210
PUT
DELISTED
Cutera, Inc.
CUTR
| $32K | ﹤0.01% |
5,400
-15,100
| -74% | -$191K |
|
6211
CALL
Actinium Pharmaceuticals
ATNM
$26.3M
| $31K | ﹤0.01% |
5,300
-9,100
| -63% | -$60.6K |
|
6212
PUT
Atossa Therapeutics
ATOS
$20.6M
| $31K | ﹤0.01% |
2,893
+73
| +3% | +$1.06K |
|
6213
PUT
Bally's
BALY
$682M
| $31K | ﹤0.01% |
2,400
-100
| -4% | -$1.53K |
|
6214
DMC Global
BOOM
$138M
| $31K | ﹤0.01% |
+1,267
| New | +$27.6K |
|
6215
CALL
CNA Financial
CNA
$14.2B
| $31K | ﹤0.01% |
800
+200
| +33% | +$7.9K |
|
6216
CALL
Citius Pharmaceuticals
CTXR
$15.6M
| $31K | ﹤0.01% |
1,840
-5,776
| -76% | -$137K |
|
6217
PUT
FIGS
FIGS
$1.79B
| $31K | ﹤0.01% |
5,300
-400
| -7% | -$2.66K |
|
|
CBIO
6218
CALL
Crescent Biopharma
CBIO
$535M
| $31K | ﹤0.01% |
212
+122
| +136% | +$19.2K |
|
6219
CALL
Acushnet Holdings
GOLF
$5.93B
| $31K | ﹤0.01% |
600
-800
| -57% | -$45K |
|
6220
CALL
Healthcare Services Group
HCSG
$1.6B
| $31K | ﹤0.01% |
3,000
+2,400
| +400% | +$29.9K |
|
6221
PUT
Hycroft Mining Holding Corp
HYMC
$1.82B
| $31K | ﹤0.01% |
10,450
-90
| -0.9% | -$333 |
|
6222
Interparfums
IPAR
$3.99B
| $31K | ﹤0.01% |
236
-1,062
| -82% | -$146K |
|
6223
PUT
MacroGenics
MGNX
$235M
| $31K | ﹤0.01% |
6,700
-20,000
| -75% | -$99.6K |
|
6224
CALL
NBT Bancorp
NBTB
$2.74B
| $31K | ﹤0.01% |
1,000
+900
| +900% | +$30.8K |
|
6225
PUT
Fidelity Nasdaq Composite Index ETF
ONEQ
$10.4B
| $31K | ﹤0.01% |
600
-1,700
| -74% | -$92.1K |
|
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.