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 | |
|---|---|---|---|---|---|---|
4901
CALL
Broadwind
BWEN
$91.3M
| $120K | ﹤0.01% |
37,600
+8,000
| +27% | +$30.4K |
|
4902
CALL
Interparfums
IPAR
$4.02B
| $120K | ﹤0.01% |
+900
| New | +$123K |
|
4903
PUT
NiSource
NI
$21.6B
| $120K | ﹤0.01% |
4,900
-1,200
| -20% | -$32.4K |
|
|
SFIX
4904
CALL
Stitch Fix
SFIX
$547M
| $120K | ﹤0.01% |
34,900
-7,700
| -18% | -$30.8K |
|
|
TERN
4905
CALL
DELISTED
Terns Pharmaceuticals
TERN
| $120K | ﹤0.01% |
23,900
+13,800
| +137% | +$87.6K |
|
|
DNMR
4906
PUT
DELISTED
Danimer Scientific, Inc.
DNMR
| $120K | ﹤0.01% |
1,453
-295
| -17% | -$26.8K |
|
|
AVID
4907
CALL
DELISTED
Avid Technology Inc
AVID
| $120K | ﹤0.01% |
4,500
+3,700
| +463% | +$97.3K |
|
4908
PUT
Alpha Pro Tech
APT
$50.7M
| $119K | ﹤0.01% |
27,600
-1,800
| -6% | -$7.48K |
|
4909
CALL
AMES National
ATLO
$269M
| $119K | ﹤0.01% |
7,200
| – | – |
|
4910
PUT
CorMedix
CRMD
$588M
| $119K | ﹤0.01% |
32,400
-46,600
| -59% | -$185K |
|
4911
PUT
Griffon
GFF
$4.03B
| $119K | ﹤0.01% |
3,000
| – | – |
|
4912
PUT
MiMedx Group
MDXG
$636M
| $119K | ﹤0.01% |
16,400
+6,200
| +61% | +$46.2K |
|
4913
PUT
Phreesia
PHR
$656M
| $119K | ﹤0.01% |
6,400
-100
| -2% | -$2.69K |
|
|
PLYM
4914
CALL
DELISTED
Plymouth Industrial REIT
PLYM
| $119K | ﹤0.01% |
+5,700
| New | +$128K |
|
4915
CALL
Perella Weinberg Partners
PWP
$1.09B
| $119K | ﹤0.01% |
11,700
| – | – |
|
|
TRTX
4916
CALL
TPG RE Finance Trust
TRTX
$628M
| $119K | ﹤0.01% |
17,700
+4,100
| +30% | +$29.7K |
|
4917
CALL
UroGen Pharma
URGN
$2B
| $119K | ﹤0.01% |
8,500
+8,000
| +1,600% | +$128K |
|
|
LEV
4918
PUT
DELISTED
The Lion Electric Company
LEV
| $119K | ﹤0.01% |
62,700
+16,000
| +34% | +$34.8K |
|
|
LICY
4919
PUT
DELISTED
Li-Cycle Holdings Corp.
LICY
| $119K | ﹤0.01% |
4,200
+325
| +8% | +$13K |
|
4920
Genesis Energy
GEL
$1.87B
| $118K | ﹤0.01% |
11,498
+7,614
| +196% | +$75K |
|
4921
Genco Shipping & Trading
GNK
$1.13B
| $118K | ﹤0.01% |
8,462
+7,251
| +599% | +$100K |
|
4922
PUT
LKQ Corp
LKQ
$5.76B
| $118K | ﹤0.01% |
2,400
-38,900
| -94% | -$2.08M |
|
4923
CALL
Motorcar Parts of America
MPAA
$260M
| $118K | ﹤0.01% |
14,600
+6,000
| +70% | +$49.6K |
|
4924
CALL
Myriad Genetics
MYGN
$507M
| $118K | ﹤0.01% |
7,400
+800
| +12% | +$15.2K |
|
4925
CALL
Pangaea Logistics
PANL
$493M
| $118K | ﹤0.01% |
20,200
+3,700
| +22% | +$23.1K |
|
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.