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 | |
|---|---|---|---|---|---|---|
8726
CALL
DLH Holdings
DLHC
$75.7M
| $14K | ﹤0.01% |
+700
| New | +$10.6K |
|
8727
PUT
DT Midstream
DTM
$14.1B
| $14K | ﹤0.01% |
+300
| New | +$14.4K |
|
8728
CALL
Evogene
EVGN
$5.99M
| $14K | ﹤0.01% |
870
-2,190
| -72% | -$49.7K |
|
8729
CALL
EXL Service
EXLS
$4.66B
| $14K | ﹤0.01% |
+500
| New | +$13.2K |
|
|
8730
PUT
EXL Service
EXLS
$4.66B
| $14K | ﹤0.01% |
500
| – | – |
|
8731
CALL
FirstCash
FCFS
$9.06B
| $14K | ﹤0.01% |
200
+100
| +100% | +$7.69K |
|
8732
PUT
Fulcrum Therapeutics
FULC
$248M
| $14K | ﹤0.01% |
+800
| New | +$15.8K |
|
8733
PUT
Disc Medicine
IRON
$2.85B
| $14K | ﹤0.01% |
163
-220
| -57% | -$21.6K |
|
8734
CALL
James River Group Holdings
JRVR
$221M
| $14K | ﹤0.01% |
+500
| New | +$15.5K |
|
8735
PUT
KULR Technology Group
KULR
$117M
| $14K | ﹤0.01% |
+638
| New | +$14.7K |
|
8736
PUT
Kayne Anderson Energy Infrastructure Fund
KYN
$2.43B
| $14K | ﹤0.01% |
1,900
-2,500
| -57% | -$20.4K |
|
8737
Lineage Cell Therapeutics
LCTX
$267M
| $14K | ﹤0.01% |
6,063
-45,320
| -88% | -$106K |
|
|
LGO
8738
Largo
LGO
$60.5M
| $14K | ﹤0.01% |
+1,535
| New | +$16K |
|
8739
Comstock
LODE
$215M
| $14K | ﹤0.01% |
+1,142
| New | +$22.4K |
|
|
8740
PUT
Comstock
LODE
$215M
| $14K | ﹤0.01% |
1,120
-5,230
| -82% | -$103K |
|
|
LITS
8741
Lite Strategy Inc
LITS
$33M
| $14K | ﹤0.01% |
+266
| New | +$14.8K |
|
8742
CALL
Mercer International
MERC
$45.6M
| $14K | ﹤0.01% |
1,200
-2,600
| -68% | -$28.8K |
|
8743
PUT
Mirum Pharmaceuticals
MIRM
$6.84B
| $14K | ﹤0.01% |
+900
| New | +$14K |
|
|
MODV
8744
CALL
DELISTED
ModivCare
MODV
| $14K | ﹤0.01% |
100
-400
| -80% | -$61.9K |
|
8745
CALL
Minerva Neurosciences
NERV
$199M
| $14K | ﹤0.01% |
2,238
-137
| -6% | -$1.29K |
|
8746
CALL
Ingevity
NGVT
$2.59B
| $14K | ﹤0.01% |
200
-4,800
| -96% | -$365K |
|
|
NVMI
8747
CALL
Nova
NVMI
$12.8B
| $14K | ﹤0.01% |
100
-200
| -67% | -$24.2K |
|
|
IMDX
8748
CALL
Insight Molecular Diagnostics
IMDX
$149M
| $14K | ﹤0.01% |
335
+125
| +60% | +$7.19K |
|
8749
PUT
Puma Biotechnology
PBYI
$406M
| $14K | ﹤0.01% |
4,700
-3,600
| -43% | -$15.6K |
|
8750
Parsons
PSN
$6.64B
| $14K | ﹤0.01% |
+439
| New | +$15.2K |
|
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.