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 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$42.6M |
| 2 |
Shopify
SHOP
|
+$39.6M |
| 3 |
iShares China Large-Cap ETF
FXI
|
+$35.4M |
| 4 |
Verizon
VZ
|
+$34.1M |
| 5 |
KraneShares CSI China Internet ETF
KWEB
|
+$34.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$49.5M |
| 2 |
GE Aerospace
GE
|
+$35.2M |
| 3 |
Carnival Corporation Ltd
CCL
|
+$30.5M |
| 4 |
Advanced Micro Devices
AMD
|
+$28.8M |
| 5 |
Micron Technology
MU
|
+$23.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.61% |
| 2 | Consumer Discretionary | 0.43% |
| 3 | Healthcare | 0.35% |
| 4 | Communication Services | 0.23% |
| 5 | Financials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
NTP
7576
PUT
DELISTED
Nam Tai Property Inc.
NTP
| $39K | ﹤0.01% |
3,900
+1,400
| +56% | +$27.9K |
|
|
AIV
7577
Aimco
AIV
$387M
| $38K | ﹤0.01% |
4,956
-47,303
| -91% | -$361K |
|
7578
PUT
Akebia Therapeutics
AKBA
$354M
| $38K | ﹤0.01% |
17,000
-16,100
| -49% | -$43.9K |
|
7579
A.O. Smith
AOS
$8.17B
| $38K | ﹤0.01% |
449
-797
| -64% | -$60.8K |
|
7580
CALL
ARKO Corp
ARKO
$896M
| $38K | ﹤0.01% |
+4,400
| New | +$42.2K |
|
7581
PUT
A10 Networks
ATEN
$2.13B
| $38K | ﹤0.01% |
2,300
-2,300
| -50% | -$34.9K |
|
7582
Aviat Networks
AVNW
$265M
| $38K | ﹤0.01% |
1,203
-253
| -17% | -$7.9K |
|
7583
PUT
Civeo
CVEO
$345M
| $38K | ﹤0.01% |
2,000
-3,500
| -64% | -$74.8K |
|
7584
Denison Mines
DNN
$2.54B
| $38K | ﹤0.01% |
28,208
-286,221
| -91% | -$469K |
|
7585
Ebang International Holdings
EBON
$12.3M
| $38K | ﹤0.01% |
1,237
-3,154
| -72% | -$161K |
|
7586
PUT
Eterna Therapeutics
ERNA
$3.83M
| $38K | ﹤0.01% |
1
-7
| -88% | -$381K |
|
7587
PUT
First Commonwealth Financial
FCF
$2.18B
| $38K | ﹤0.01% |
2,400
-17,800
| -88% | -$270K |
|
7588
Forward Air
FWRD
$444M
| $38K | ﹤0.01% |
+318
| New | +$32.5K |
|
7589
PUT
Geron
GERN
$828M
| $38K | ﹤0.01% |
31,600
-69,800
| -69% | -$100K |
|
7590
Liberty Broadband Class A
LBRDA
$4.89B
| $38K | ﹤0.01% |
+239
| New | +$38.7K |
|
|
DFTX
7591
Definium Therapeutics
DFTX
$5.78B
| $38K | ﹤0.01% |
1,881
-11,350
| -86% | -$362K |
|
7592
PUT
National Fuel Gas
NFG
$7.82B
| $38K | ﹤0.01% |
600
-6,700
| -92% | -$400K |
|
7593
CALL
nVent Electric
NVT
$24.9B
| $38K | ﹤0.01% |
1,000
-21,900
| -96% | -$777K |
|
7594
CALL
NWPX Infrastructure Inc
NWPX
$1.19B
| $38K | ﹤0.01% |
+1,200
| New | +$33K |
|
7595
CALL
Pluri
PLUR
$16.7M
| $38K | ﹤0.01% |
3,263
+2,475
| +314% | +$48.9K |
|
7596
SELLAS Life Sciences
SLS
$1.97B
| $38K | ﹤0.01% |
+6,948
| New | +$52.6K |
|
|
SNBR
7597
CALL
DELISTED
Sleep Number
SNBR
| $38K | ﹤0.01% |
500
-6,600
| -93% | -$553K |
|
7598
The ONE Group
STKS
$56.2M
| $38K | ﹤0.01% |
+3,064
| New | +$40.4K |
|
7599
PUT
Telefônica Brasil
VIV
$20.6B
| $38K | ﹤0.01% |
4,400
+1,600
| +57% | +$13.6K |
|
|
VIVO
7600
PUT
VivoPower PLC
VIVO
$110M
| $38K | ﹤0.01% |
1,270
-310
| -20% | -$14.1K |
|
Similar funds
Simplex Trading's Q4 2021 Portfolio in Review
As of Q4 2021, Simplex Trading held 12,077 positions worth $99B, down 7.5% from $107B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading withdrew a net $10.8B in Q4 2021, closing 1,645 positions and reducing 4,258 holdings. Its most notable exit was Carnival Corporation Ltd, an estimated $30.5M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.61% of assets, up from 0.49% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares China Large-Cap ETF worth $33M.
- Simplex Trading's largest Q4 2021 buy was iShares China Large-Cap ETF: 902,666 shares worth $33M.
- Simplex Trading added most to State Street Financial Select Sector SPDR ETF in Q4 2021, an estimated $42.6M increase.
- Simplex Trading's biggest Q4 2021 reduction was AMC Entertainment Holdings, cutting an estimated $49.5M.
- Simplex Trading fully exited Carnival Corporation Ltd in Q4 2021, selling an estimated $30.5M.
- Simplex Trading's ten largest holdings make up 33% of its $99B portfolio in Q4 2021.
- Simplex Trading opened 2,269 new positions and closed 1,645 in Q4 2021.
- Simplex Trading's portfolio value fell 7.5% quarter-over-quarter to $99B.
Based on Simplex Trading's 13F filing for Q4 2021, filed 4 Feb 2022.