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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.43% |
| 2 | Technology | 0.41% |
| 3 | Healthcare | 0.21% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
CALL
Philip Morris
PM
$284B
| $22.8M | 0.02% |
233,800
+108,300
| +86% | +$10.3M |
|
527
PUT
Zoetis
ZTS
$31.3B
| $22.8M | 0.02% |
132,300
+18,900
| +17% | +$3.27M |
|
528
PUT
Microchip Technology
MCHP
$40.3B
| $22.6M | 0.02% |
252,400
+86,700
| +52% | +$6.84M |
|
529
CALL
United States Oil Fund
USO
$1.61B
| $22.6M | 0.02% |
355,800
-328,700
| -48% | -$21.4M |
|
530
CALL
Rio Tinto
RIO
$168B
| $22.6M | 0.02% |
353,600
-28,800
| -8% | -$1.85M |
|
531
CALL
Transocean
RIG
$6.53B
| $22.4M | 0.02% |
3,195,300
+1,259,900
| +65% | +$7.79M |
|
532
PUT
Plug Power
PLUG
$3.03B
| $22.4M | 0.02% |
2,155,400
+767,300
| +55% | +$6.98M |
|
533
CALL
Biogen
BIIB
$32.6B
| $22.4M | 0.02% |
78,600
-21,700
| -22% | -$6.46M |
|
534
PUT
SoFi Technologies
SOFI
$23.5B
| $22.4M | 0.02% |
2,681,000
+977,100
| +57% | +$6.37M |
|
535
CALL
Builders FirstSource
BLDR
$7.08B
| $22.3M | 0.02% |
164,300
+100,400
| +157% | +$11.2M |
|
536
PUT
APA Corp
APA
$15B
| $22.3M | 0.02% |
652,800
+168,700
| +35% | +$5.89M |
|
537
Walt Disney
DIS
$182B
| $22.2M | 0.02% |
248,676
+91,342
| +58% | +$8.65M |
|
538
Alibaba
BABA
$281B
| $22.2M | 0.02% |
265,799
-2,920
| -1% | -$256K |
|
539
JD.com
JD
$38.2B
| $22.1M | 0.02% |
646,303
+51,678
| +9% | +$1.88M |
|
540
PUT
GitLab
GTLB
$8.3B
| $22M | 0.02% |
431,400
+230,600
| +115% | +$8.57M |
|
541
PUT
Northrop Grumman
NOC
$73.2B
| $22M | 0.02% |
48,300
-32,600
| -40% | -$14.8M |
|
542
CALL
eBay
EBAY
$46B
| $22M | 0.02% |
492,500
-10,300
| -2% | -$457K |
|
543
CALL
Phillips 66
PSX
$102B
| $22M | 0.02% |
230,400
-105,600
| -31% | -$10.3M |
|
544
CALL
NXP Semiconductors
NXPI
$57.5B
| $22M | 0.02% |
107,300
+37,000
| +53% | +$6.58M |
|
|
CTLT
545
PUT
DELISTED
CATALENT, INC.
CTLT
| $21.9M | 0.02% |
506,000
+431,900
| +583% | +$19M |
|
546
CALL
C.H. Robinson
CHRW
$17.3B
| $21.8M | 0.02% |
231,100
+47,800
| +26% | +$4.62M |
|
547
CALL
AT&T
T
$176B
| $21.8M | 0.02% |
1,933,300
-1,841,400
| -49% | -$31.4M |
|
548
PUT
Comcast
CMCSA
$94B
| $21.8M | 0.02% |
524,100
-756,800
| -59% | -$30.1M |
|
549
CALL
American Tower
AMT
$81.9B
| $21.6M | 0.02% |
111,300
-45,600
| -29% | -$8.92M |
|
550
PUT
Honeywell
HON
$66.4B
| $21.6M | 0.02% |
110,344
-216,762
| -66% | -$40.3M |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,349 increased, 3,911 reduced and 1,518 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,518 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.