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 | |
|---|---|---|---|---|---|---|
451
CALL
Newmont
NEM
$102B
| $19.6M | 0.02% |
+332,500
| New | +$22.3M |
|
452
PUT
Intuit
INTU
$77.8B
| $19.6M | 0.02% |
40,000
+39,469
| +7,433% | +$17.1M |
|
453
PUT
Vipshop
VIPS
$7.05B
| $19.5M | 0.02% |
971,500
+968,135
| +28,771% | +$24.3M |
|
454
Futu Holdings
FUTU
$14.9B
| $19.4M | 0.02% |
108,607
+38,082
| +54% | +$5.54M |
|
455
CALL
Veeva Systems
VEEV
$30B
| $19.4M | 0.02% |
62,400
+62,032
| +16,857% | +$17.3M |
|
456
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $19.4M | 0.02% |
39,500
+39,068
| +9,044% | +$19.3M |
|
457
CALL
Lyft
LYFT
$5.57B
| $19.4M | 0.02% |
320,000
+315,715
| +7,368% | +$18.2M |
|
|
PSTH
458
CALL
DELISTED
Pershing Square Tontine Holdings, Ltd.
PSTH
| $19.3M | 0.02% |
847,100
+839,326
| +10,797% | +$20.2M |
|
|
VMW
459
PUT
DELISTED
VMware, Inc
VMW
| $19.1M | 0.02% |
+119,700
| New | +$19.2M |
|
460
VanEck Semiconductor ETF
SMH
$70.7B
| $19.1M | 0.02% |
145,552
+145,394
| +92,022% | +$18M |
|
461
CALL
Cloudflare
NET
$95.5B
| $19.1M | 0.02% |
180,300
+176,895
| +5,195% | +$14.6M |
|
462
PUT
AstraZeneca
AZN
$263B
| $19M | 0.02% |
+158,800
| New | +$17.4M |
|
463
PUT
DexCom
DXCM
$27.6B
| $19M | 0.02% |
178,000
+177,352
| +27,369% | +$17M |
|
464
CALL
Analog Devices
ADI
$188B
| $19M | 0.02% |
+110,200
| New | +$17.7M |
|
465
CALL
Marvell Technology
MRVL
$189B
| $19M | 0.02% |
+325,000
| New | +$15.9M |
|
466
PUT
Palo Alto Networks
PANW
$273B
| $18.9M | 0.02% |
306,000
+305,010
| +30,809% | +$18.1M |
|
467
PUT
Merck
MRK
$315B
| $18.9M | 0.02% |
802,800
+797,059
| +13,884% | +$59.3M |
|
468
CALL
ConocoPhillips
COP
$145B
| $18.9M | 0.02% |
+310,000
| New | +$17.3M |
|
469
CALL
Upstart Holdings
UPST
$2.74B
| $18.9M | 0.02% |
151,100
+150,753
| +43,445% | +$18.6M |
|
470
PUT
S&P Global
SPGI
$127B
| $18.8M | 0.02% |
45,700
+45,449
| +18,107% | +$17.5M |
|
471
CALL
DoorDash
DASH
$77.4B
| $18.7M | 0.02% |
105,100
+104,219
| +11,830% | +$15.3M |
|
472
CALL
Fastly Inc
FSLY
$3.2B
| $18.7M | 0.02% |
313,900
+312,491
| +22,178% | +$17.8M |
|
473
CALL
Medtronic
MDT
$105B
| $18.7M | 0.02% |
150,400
+149,701
| +21,416% | +$18.8M |
|
474
Strategy Inc
MSTR
$36.5B
| $18.6M | 0.02% |
279,800
-77,360
| -22% | -$4.58M |
|
475
CALL
Petrobras
PBR
$122B
| $18.5M | 0.02% |
1,511,000
+1,503,804
| +20,898% | +$14.8M |
|
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.