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 | |
|---|---|---|---|---|---|---|
5551
Winnebago Industries
WGO
$856M
| $155K | ﹤0.01% |
2,076
-170
| -8% | -$12.2K |
|
5552
CALL
Westlake Corp
WLK
$9.03B
| $155K | ﹤0.01% |
1,600
-2,000
| -56% | -$195K |
|
|
PTR
5553
DELISTED
PETROCHINA COMPANY LIMITED ADS (REP 100 H SHARES)
PTR
| $155K | ﹤0.01% |
+3,522
| New | +$166K |
|
|
NBRV
5554
CALL
DELISTED
Nabriva Therapeutics plc Ordinary Shares Ireland
NBRV
| $155K | ﹤0.01% |
10,384
-932
| -8% | -$22.1K |
|
|
ALLK
5555
DELISTED
Allakos
ALLK
| $154K | ﹤0.01% |
15,815
+12,960
| +454% | +$1.06M |
|
|
ARBK
5556
Argo Blockchain
ARBK
$41.9M
| $154K | ﹤0.01% |
+59
| New | +$206K |
|
5557
Xtrackers Harvest CSI 500 China A-Shares Small Cap ETF
ASHS
$32.7M
| $154K | ﹤0.01% |
3,760
+2,098
| +126% | +$85.2K |
|
5558
Builders FirstSource
BLDR
$7.15B
| $154K | ﹤0.01% |
1,807
-17,746
| -91% | -$1.2M |
|
5559
PUT
CarGurus
CARG
$3.27B
| $154K | ﹤0.01% |
4,600
-5,800
| -56% | -$204K |
|
5560
Clover Health Investments
CLOV
$2.2B
| $154K | ﹤0.01% |
41,604
-6,673
| -14% | -$40.9K |
|
5561
Donaldson
DCI
$10.9B
| $154K | ﹤0.01% |
2,603
-2,625
| -50% | -$155K |
|
5562
Evolus
EOLS
$385M
| $154K | ﹤0.01% |
23,747
+16,489
| +227% | +$113K |
|
5563
PUT
Kosmos Energy
KOS
$1.6B
| $154K | ﹤0.01% |
44,600
+12,300
| +38% | +$44.1K |
|
|
NVRO
5564
PUT
DELISTED
NEVRO CORP.
NVRO
| $154K | ﹤0.01% |
1,900
-1,300
| -41% | -$130K |
|
|
PAYA
5565
CALL
DELISTED
Paya Holdings Inc. Class A Common Stock
PAYA
| $154K | ﹤0.01% |
24,400
-55,300
| -69% | -$449K |
|
5566
CALL
EverQuote
EVER
$892M
| $153K | ﹤0.01% |
9,800
+2,900
| +42% | +$44.2K |
|
5567
PUT
Legend Biotech
LEGN
$3.59B
| $153K | ﹤0.01% |
3,300
+1,900
| +136% | +$96.4K |
|
5568
CALL
Everspin Technologies
MRAM
$341M
| $153K | ﹤0.01% |
+13,600
| New | +$123K |
|
5569
Otter Tail
OTTR
$3.71B
| $153K | ﹤0.01% |
+2,145
| New | +$139K |
|
5570
Ouster
OUST
$2.63B
| $153K | ﹤0.01% |
+2,959
| New | +$192K |
|
5571
Rogers Corp
ROG
$2.21B
| $153K | ﹤0.01% |
563
+241
| +75% | +$58.6K |
|
5572
CALL
TTEC Holdings
TTEC
$121M
| $153K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$145K |
|
5573
Procure Space ETF
UFO
$587M
| $153K | ﹤0.01% |
5,659
-24,654
| -81% | -$719K |
|
|
INFI
5574
DELISTED
Infinity Pharmaceuticals, Inc.
INFI
| $153K | ﹤0.01% |
68,269
+4,358
| +7% | +$10.9K |
|
5575
CALL
Alarm.com
ALRM
$2.71B
| $152K | ﹤0.01% |
1,800
-15,500
| -90% | -$1.27M |
|
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.