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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MYOV
3476
PUT
DELISTED
Myovant Sciences Ltd.
MYOV
| $792K | ﹤0.01% |
34,800
+34,367
| +7,937% | +$723K |
|
3477
CALL
Vail Resorts
MTN
$5.28B
| $791K | ﹤0.01% |
2,500
+2,473
| +9,159% | +$788K |
|
3478
Artisan Partners
APAM
$2.86B
| $790K | ﹤0.01% |
15,562
+14,298
| +1,131% | +$751K |
|
3479
Sonos
SONO
$1.87B
| $789K | ﹤0.01% |
22,408
-26,771
| -54% | -$1M |
|
3480
CALL
Westwater Resources
WWR
$50.8M
| $789K | ﹤0.01% |
165,800
+165,036
| +21,602% | +$745K |
|
|
HA
3481
PUT
DELISTED
Hawaiian Holdings, Inc.
HA
| $789K | ﹤0.01% |
32,400
+31,946
| +7,037% | +$824K |
|
3482
CALL
G-III Apparel Group
GIII
$1.52B
| $788K | ﹤0.01% |
24,000
+23,902
| +24,390% | +$774K |
|
|
DOC
3483
PUT
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $788K | ﹤0.01% |
42,700
+42,141
| +7,539% | +$784K |
|
3484
CALL
Neogen
NEOG
$2.03B
| $787K | ﹤0.01% |
17,100
+17,096
| +427,400% | +$790K |
|
3485
CALL
LifeMD
LFMD
$187M
| $786K | ﹤0.01% |
66,800
+66,099
| +9,429% | +$761K |
|
3486
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$370M
| $786K | ﹤0.01% |
12,694
+4,863
| +62% | +$282K |
|
3487
PUT
Acadia Pharmaceuticals
ACAD
$4.35B
| $785K | ﹤0.01% |
32,200
+29,052
| +923% | +$656K |
|
3488
CALL
Mitek Systems
MITK
$768M
| $785K | ﹤0.01% |
+40,800
| New | +$686K |
|
|
API
3489
PUT
Agora
API
$337M
| $784K | ﹤0.01% |
18,700
+18,561
| +13,353% | +$859K |
|
3490
CALL
Calix
CALX
$2.32B
| $783K | ﹤0.01% |
16,500
+16,276
| +7,266% | +$715K |
|
3491
Leslie's
LESL
$10.8M
| $783K | ﹤0.01% |
1,426
+456
| +47% | +$250K |
|
|
LX
3492
LexinFintech Holdings
LX
$241M
| $783K | ﹤0.01% |
63,935
-5,781
| -8% | -$58.6K |
|
3493
CALL
CleanSpark
CLSK
$3.6B
| $782K | ﹤0.01% |
47,000
+46,489
| +9,098% | +$854K |
|
3494
Virgin Galactic
SPCE
$325M
| $782K | ﹤0.01% |
851
-1,683
| -66% | -$956K |
|
3495
Silicon Motion
SIMO
$8.29B
| $781K | ﹤0.01% |
12,186
+3,645
| +43% | +$240K |
|
3496
Sabre
SABR
$704M
| $780K | ﹤0.01% |
62,507
-89,136
| -59% | -$1.25M |
|
|
UFS
3497
PUT
DELISTED
DOMTAR CORPORATION (New)
UFS
| $780K | ﹤0.01% |
14,200
+14,057
| +9,830% | +$680K |
|
3498
nCino
NCNO
$1.93B
| $779K | ﹤0.01% |
13,014
-13,207
| -50% | -$832K |
|
3499
CALL
Clearfield
CLFD
$436M
| $778K | ﹤0.01% |
20,800
+20,778
| +94,445% | +$738K |
|
3500
CALL
Gaming and Leisure Properties
GLPI
$12.8B
| $778K | ﹤0.01% |
16,800
+16,740
| +27,900% | +$770K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.