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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
451
CALL
Lyft
LYFT
$5.57B
| $20.1M | 0.02% |
324,800
+4,800
| +2% | +$255K |
|
|
452
Advanced Micro Devices
AMD
$901B
| $20.1M | 0.02% |
215,308
+190,043
| +752% | +$19.4M |
|
|
LOGC
453
CALL
DELISTED
ContextLogic
LOGC
| $20M | 0.02% |
54,530
-2,667
| -5% | -$664K |
|
454
CALL
Wayfair
W
$11.1B
| $20M | 0.02% |
65,100
+400
| +0.6% | +$113K |
|
455
PUT
MetLife
MET
$60B
| $19.9M | 0.02% |
329,200
+900
| +0.3% | +$54.2K |
|
456
CALL
Veeva Systems
VEEV
$30B
| $19.9M | 0.02% |
63,400
+1,000
| +2% | +$317K |
|
457
CALL
Arista Networks
ANET
$220B
| $19.8M | 0.02% |
873,600
| – | – |
|
458
PUT
S&P Global
SPGI
$127B
| $19.8M | 0.02% |
48,100
+2,400
| +5% | +$1.04M |
|
459
PUT
Merck
MRK
$315B
| $19.8M | 0.02% |
815,000
+12,200
| +2% | +$928K |
|
460
PUT
Unity
U
$12.8B
| $19.8M | 0.02% |
187,100
-4,000
| -2% | -$474K |
|
461
CALL
DoorDash
DASH
$77.4B
| $19.8M | 0.02% |
109,500
+4,400
| +4% | +$842K |
|
462
PUT
Intuit
INTU
$77.8B
| $19.7M | 0.02% |
40,100
+100
| +0.3% | +$53.9K |
|
463
PUT
Vanguard FTSE Europe ETF
VGK
$30.2B
| $19.6M | 0.02% |
325,200
+100
| +0% | +$6.85K |
|
464
PUT
Lemonade
LMND
$4.87B
| $19.6M | 0.02% |
174,000
+7,100
| +4% | +$572K |
|
465
CALL
Fastly Inc
FSLY
$3.2B
| $19.6M | 0.02% |
337,600
+23,700
| +8% | +$1.09M |
|
466
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $19.6M | 0.02% |
39,500
| – | – |
|
467
CALL
Upstart Holdings
UPST
$2.74B
| $19.6M | 0.02% |
157,800
+6,700
| +4% | +$1.32M |
|
468
PUT
AstraZeneca
AZN
$263B
| $19.5M | 0.02% |
161,300
+2,500
| +2% | +$291K |
|
469
Freeport-McMoran
FCX
$93.4B
| $19.5M | 0.02% |
524,497
-13,737
| -3% | -$484K |
|
470
PUT
Las Vegas Sands
LVS
$30B
| $19.4M | 0.02% |
366,000
+24,800
| +7% | +$1.06M |
|
471
CALL
Medtronic
MDT
$105B
| $19.4M | 0.02% |
153,500
+3,100
| +2% | +$401K |
|
|
X
472
DELISTED
US Steel
X
| $19.3M | 0.02% |
801,489
+32,148
| +4% | +$804K |
|
|
PSTH
473
CALL
DELISTED
Pershing Square Tontine Holdings, Ltd.
PSTH
| $19.3M | 0.02% |
856,900
+9,800
| +1% | +$199K |
|
474
CALL
Cloudflare
NET
$95.5B
| $19.1M | 0.02% |
183,200
+2,900
| +2% | +$346K |
|
475
Snap
SNAP
$7.52B
| $19.1M | 0.02% |
282,168
+34,598
| +14% | +$2.5M |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.