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 | |
|---|---|---|---|---|---|---|
2251
CALL
Liberty Latin America Class C
LILAK
$1.5B
| $705K | ﹤0.01% |
479
-153
| -24% | -$2.5K |
|
2252
CALL
Sonos
SONO
$1.75B
| $705K | ﹤0.01% |
622
+375
| +152% | +$4.12K |
|
2253
Zillow
Z
$7.04B
| $705K | ﹤0.01% |
+15,206
| New | +$606K |
|
|
MNDT
2254
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $705K | ﹤0.01% |
+47,633
| New | +$731K |
|
2255
Neurocrine Biosciences
NBIX
$17.7B
| $702K | ﹤0.01% |
8,326
+1,103
| +15% | +$90.6K |
|
2256
PUT
Plains GP Holdings
PAGP
$5.23B
| $701K | ﹤0.01% |
281
+147
| +110% | +$3.55K |
|
2257
CALL
Pinduoduo
PDD
$118B
| $701K | ﹤0.01% |
340
-642
| -65% | -$13.9K |
|
2258
Bread Financial
BFH
$4.21B
| $698K | ﹤0.01% |
6,249
-2,878
| -32% | -$348K |
|
2259
Penumbra
PEN
$12.5B
| $698K | ﹤0.01% |
4,366
-7,859
| -64% | -$1.13M |
|
|
REV
2260
PUT
DELISTED
Revlon, Inc.
REV
| $697K | ﹤0.01% |
361
+160
| +80% | +$3.49K |
|
2261
PUT
Tradeweb Markets
TW
$21.3B
| $696K | ﹤0.01% |
+159
| New | +$6.64K |
|
2262
Albemarle
ALB
$13.5B
| $695K | ﹤0.01% |
9,877
+1,984
| +25% | +$146K |
|
2263
PUT
Copart
CPRT
$25.9B
| $695K | ﹤0.01% |
372
-1,004
| -73% | -$17.2K |
|
2264
CALL
KeyCorp
KEY
$24.3B
| $695K | ﹤0.01% |
392
-1,641
| -81% | -$27.8K |
|
2265
CALL
Logitech
LOGI
$15.2B
| $695K | ﹤0.01% |
175
-238
| -58% | -$9.28K |
|
2266
PUT
Trex
TREX
$4.51B
| $695K | ﹤0.01% |
194
-110
| -36% | -$3.73K |
|
2267
Avis
CAR
$5.63B
| $693K | ﹤0.01% |
19,721
-11,711
| -37% | -$393K |
|
2268
CALL
Oshkosh
OSK
$9.67B
| $692K | ﹤0.01% |
83
+49
| +144% | +$3.86K |
|
|
TVTY
2269
CALL
DELISTED
Tivity Health, Inc. Common Stock
TVTY
| $692K | ﹤0.01% |
422
-185
| -30% | -$3.57K |
|
|
HDS
2270
PUT
DELISTED
HD Supply Holdings, Inc.
HDS
| $692K | ﹤0.01% |
172
-351
| -67% | -$15.1K |
|
2271
CALL
Cencora
COR
$60.3B
| $690K | ﹤0.01% |
81
-406
| -83% | -$32.1K |
|
2272
Infosys
INFY
$45B
| $690K | ﹤0.01% |
64,543
+11,336
| +21% | +$120K |
|
2273
Moderna
MRNA
$21.5B
| $690K | ﹤0.01% |
47,138
+32,760
| +228% | +$704K |
|
2274
PUT
Brighthouse Financial
BHF
$3.63B
| $689K | ﹤0.01% |
188
-128
| -41% | -$4.95K |
|
2275
CALL
Chewy
CHWY
$8.54B
| $689K | ﹤0.01% |
+197
| New | +$6.65K |
|
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.