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 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.5% |
| 2 | Communication Services | 0.5% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.3% |
| 5 | Consumer Discretionary | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
WCG
526
PUT
DELISTED
Wellcare Health Plans, Inc.
WCG
| $7.07M | 0.02% |
248
+11
| +5% | +$3.03K |
|
527
CALL
Petrobras
PBR
$122B
| $7.05M | 0.02% |
4,530
-5,072
| -53% | -$77.3K |
|
528
PUT
Essex Property Trust
ESS
$18.8B
| $7.04M | 0.02% |
241
-61
| -20% | -$17.6K |
|
|
TYNS
529
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $7.03M | 0.02% |
981
+368
| +60% | +$10.1K |
|
|
CYBR
530
PUT
DELISTED
CyberArk
CYBR
| $6.99M | 0.02% |
547
+279
| +104% | +$35.3K |
|
531
PUT
Diamondback Energy
FANG
$57.8B
| $6.96M | 0.02% |
639
+69
| +12% | +$7.2K |
|
532
CALL
TSMC
TSM
$2.16T
| $6.92M | 0.02% |
1,768
-366
| -17% | -$15.1K |
|
|
PARA
533
CALL
DELISTED
Paramount Global Class B
PARA
| $6.91M | 0.02% |
1,385
+1,001
| +261% | +$49.5K |
|
534
PUT
Wabtec
WAB
$50.3B
| $6.9M | 0.02% |
961
+19
| +2% | +$1.35K |
|
535
PUT
iShares MSCI Global Gold Miners ETF
RING
$2.31B
| $6.86M | 0.02% |
1,408
-715
| -34% | -$12.4K |
|
536
CALL
Check Point Software Technologies
CHKP
$13.1B
| $6.86M | 0.02% |
593
-69
| -10% | -$8.15K |
|
537
CALL
Intuit
INTU
$77B
| $6.85M | 0.02% |
262
-68
| -21% | -$17.3K |
|
538
PUT
Lennox International
LII
$18.7B
| $6.82M | 0.02% |
248
-40
| -14% | -$10.9K |
|
|
XYZ
539
Block Inc
XYZ
$45.5B
| $6.81M | 0.02% |
93,952
-59,873
| -39% | -$4.18M |
|
|
ARRY
540
PUT
DELISTED
Array Biopharma Inc
ARRY
| $6.8M | 0.02% |
1,469
+1,364
| +1,299% | +$38.3K |
|
541
CALL
Whirlpool
WHR
$2.31B
| $6.79M | 0.02% |
477
+384
| +413% | +$51.5K |
|
542
CALL
CarMax
KMX
$8.29B
| $6.76M | 0.02% |
779
-405
| -34% | -$31.7K |
|
|
ALXN
543
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $6.76M | 0.02% |
516
-671
| -57% | -$86.5K |
|
544
PUT
Prudential Financial
PRU
$40.9B
| $6.73M | 0.02% |
666
-966
| -59% | -$96.3K |
|
545
PUT
Seagate
STX
$207B
| $6.65M | 0.02% |
1,411
+728
| +107% | +$33.9K |
|
546
PUT
CF Industries
CF
$19.5B
| $6.65M | 0.02% |
1,423
+478
| +51% | +$20.7K |
|
|
IRBT
547
PUT
DELISTED
iRobot
IRBT
| $6.64M | 0.02% |
725
-266
| -27% | -$27K |
|
548
Chipotle Mexican Grill
CMG
$41.1B
| $6.64M | 0.02% |
452,850
+447,850
| +8,957% | +$6.31M |
|
|
549
CALL
iShares MSCI Global Gold Miners ETF
RING
$2.31B
| $6.63M | 0.02% |
1,300
-28
| -2% | -$486 |
|
550
PUT
ProShares Ultra S&P500
SSO
$7.82B
| $6.62M | 0.02% |
5,440
+536
| +11% | +$8.15K |
|
Similar funds
Simplex Trading's Q2 2019 Portfolio in Review
As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,301 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.
By sector, the portfolio is most concentrated in Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.
- Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
- Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
- Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
- Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
- Simplex Trading opened 1,261 new positions and closed 1,301 in Q2 2019.
- Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.
Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.